Date   

Re: Computer Requirements to run SDR#

sdrsharp
 

That's it. Now decoding its RDS is another story. I believe it can be done using statistic methods.

--- In SDRSharp@yahoogroups.co.uk, Alberto I2PHD <i2phd@...> wrote:

On 9/3/2013 5:44 PM, sdrsharp wrote:

/Let's play a game: Find the Tunisian DX station in that file./

This should be the Tunisian station. That file does not have in its headers
compatible information about the central frequency, so the frequency
indicated on the scale is not correct.


https://dl.dropboxusercontent.com/u/15089947/tunisian.gif


--
/*73 Alberto I2PHD*/


Re: [SDRSharp] Re: Computer Requirements to run SDR#

Alberto I2PHD
 

On 9/3/2013 5:44 PM, sdrsharp wrote:

Let's play a game: Find the Tunisian DX station in that file.


This should be the Tunisian station. That file does not have in its headers
compatible information about the central frequency, so the frequency
indicated on the scale is not correct.


��


--
73 Alberto I2PHD


Re: [SDRSharp] mono recording AF files

belvasi <belvasi@...>
 

This site is in Russian, but has a Google translate option at the top of the page. The download link is at the end of the article.

Vasili.

04.09.2013, 08:51, "John" <gielisj@westnet.com.au>:

thankyou Muchly Vasili..

THAT plugin (once you take the trouble to translate Russian on the page
and find the zip file) is one super plugin !!
Thankfully the plugin itself is English.

Included in the plugin are:
Sample Format - 8 & 16 bit mono or stereo, 32 bit IEEE float
Sample rate - 8/16/32 kHz
Folder select - a choice of folder location
Audio/Baseband - audio stream or raw IQ
Don't write pause - said to be squelch controlled (not tested here yet)

Within the downloaded zip file is a dll that has to replace the current
SDRsharp.waveRecorder.dll file.

Also, an option to edit the config file. To quote the author:
"In the configuration file line <add key="AutoStartRecording" value="False" />
manages autostart entries. If "False" is replaced by "True" record will start
automatically after the launch of the receiver.
To simplify the installation can use the script."

I found that addition to the config to throw up an error flag when SDR# is
loaded, otherwise it will load if you disregard the error... w/o that addition
the prog loads w/o fault, and operates as per normal.

The one thing that this writer has improved on, is that all the record settings
are saved when the program is restarted. Salutations (Приветствия) !!

And another nice addition is: as you click on different preset frequencies
the recorder writes another file with appropriate filemname. This has only been
tested in one MODE as yet...be interesting if the recorded format also follows
suit i.e. AM; FM; CW ect.

Well that my bit (pardon pun)

73 John

On 03-Sep-13 6:02 PM, belvasi wrote:
Mono record is missing.

Use the modified plugin records http://sdrts.amoti.ru/plagin_zapisi_wrp_
There is a mono recording and decrease sampling rate for savings.

Vasili.


03.09.2013, 03:47, "John"<gielisj@westnet.com.au>:
Hello Group,

I would like to know how the SDR# software
is instructed to record in mono, as against stereo.
It seems a total waste of time recording in stereo :)

Is the mono setting completely reliant on the type/brand
of soundcard, or is there a setting in the config file?

73 John

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Re: [SDRSharp] Re: SDRSharp won't work

don2822003
 

On 4/09/2013 12:56 PM, paulnn4f wrote:
John,
not a problem, I don't have any thunder :) just trying to get him working... :)

Paul - NN4F

--- In SDRSharp@yahoogroups.co.uk, John <gielisj@...> wrote:
Hey Paul- - NN4F

I didn't mean to steal ye thunder..
Never saw your answer, till after I sent my response.

73 John :)

On 04-Sep-13 12:40 PM, John wrote:
paste that error code into google

1st link is .NET from MS

73 John

On 04-Sep-13 12:38 PM, paulnn4f wrote:
Don,

you have to install Mircosoft's .net framework from here
http://www.microsoft.com/en-gb/download/details.aspx?id=21

then you should be good to go...
Paul - NN4F

--- In SDRSharp@yahoogroups.co.uk, vk3yv<vk3yv@> wrote:
Hi All, I am very frustrated, I can't get SDRSharp to work when
installed. I have installed it 4 times now and get the same error
message when I attempt to run it. "The application failed to initialize
properly (0xc 0000135)".
I am working from an article in a local electronics Mag and have found
things like 7zip is a new version ,and the Zadig program does not find
any items other than a bulk interface. But when using the test to check
it it comes back with the right answers, so it looks like it is working
but the SDRSharp program is not. The dongle is one containing a RTL283U
& AN R820T.
Has anyone else experienced this problem.... What am I doing wrong????...
Regards,
Don,
VK3YV ....
ps. I am not a programmer!.

------------------------------------





Hi All, well I got it going. Many thanks to all who replied, without that info I wounld have never got there. as I mentioned I am not a programmer and age is catching up with me (70) and the article that I was following never mentioned the .net requirement at all and as it turned out I needed to do a complete reinstall of the hard disk as I had forgotten the put service pack3 on when I put the system together yesterday, and with all the trying to get it to work I thought the disk would be a mess with a lot of crud lurking so all is well now. I will have to build a switchable CTCSS filter or all of the subaudibe tones will drive me mad whist tuning around. Again many thanks , Don.....


------------------------------------

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Re: [SDRSharp] Newbie SDRSharp & Airband

Alan
 

----- Original Message -----
Subject: [SDRSharp] Newbie SDRSharp & Airband


I'm pretty new to SDRSharp and I'm wondering what the best settings are for the Airband, because I cannot get a clear voice sound (bandwith, filter order, noise reduction...) whatever I try so far?
Also what's the purpose of "filter order" ?
(working with a Terratec stick)
I've never tried. Default SDR# settings should be fine.
The gain on these cheap dongles is critical, overload easy.

73 Alan G4ZFQ


Newbie SDRSharp & Airband

eddyjans
 

Hello,
I'm pretty new to SDRSharp and I'm wondering what the best settings are for the Airband, because I cannot get a clear voice sound (bandwith, filter order, noise reduction...) whatever I try so far?
Also what's the purpose of "filter order" ?
(working with a Terratec stick)

Tnx a lot in advance


Re: [SDRSharp] Re: RTL2832U & R820T

jdow <jdow@...>
 

OK, it appears from metadata in his header he's in Tennessee. The
counties around Nashville suggest he's speaking of a 40 mile distance. If
he is up 80' and the antenna at the other end is up 80 feet the radio
horizon for each is 13 miles. So he has 26 mile range plus a little more
from diffraction modes. His desired station is likely within a few miles.
Call it 2.6 miles for grins. That means there is already a 20 dB additional
path loss to the distant station at 26 miles. And that seems to be a little
less than the very rough 40 mile "three counties over" measurement. That's
more like another on 4 dB loss give or take a little. ("County" distances
guestimated from Google Earth.)

High power for a police radio is 100 watts. Low power is typically 25
watts or maybe as low as 5 watts if for a small municipal operation. This
does not make up the 20 dB loss. Capture effects should make the "digital"
signal inaudible.

This STRONGLY suggests somebody has some equipment very close to his house
or even in his house that gets turned on at night and is off during the
day. It MAY not even be on the same frequency as cross modulation can make
it seem that way. He can tell a lot from the characteristics of the noise.
Is it there all the time? If yes, it is likely something on that frequency
or rather broadbanded. If not it may be cross modulation or it may still
be something else on the frequency that keys up intermittently. If the
local signals are OK during the day and there is no continuous
interference at night AND the interference magically appears only when
the local signals come on then it is cross modulation between some very
strong local signal and his desired signal. This is purely an overload
phenomenon.

I very strongly suggest it is NOT another legitimate or illegal signal
on the local frequency. If it was there then the police would be
suffering the same interference he is. And they'd be working very hard
to get the situation mitigated as it could severely compromise safety
in the municipality.

I'd also suggest he look at the FCC database. It will be accurate and
up to date. Third party databases are likely to be inaccurate or out
of date. He should also consider the distance squared loss characteristics
of radio propagation. (The same power is illuminating the surface of a
larger sphere. So you get less power per "antenna capture area size" as
you get further away on a square of distance basis. That's a basic surface
area of a sphere calculation.)

{^_^} Joanne

On 2013/09/04 01:05, s.lloydhughes@btopenworld.com wrote:


"Of course you may be lucky enough to have a very tall mast or live on top of a
mountain."

In a nice part of the Country was a big clue. Your radio horizon will be quite a
distance away. Allowing you to receive vhf/uhf signals from far away. A
directional antenna may help. If the interferer is from another direction. Or
adjustiing the position of your antenna both in height and position. To null the
received interfering signal. At the frequency you are using, a few inches to a
few feet may be all that is required. Both vertically and or horizontally.

You have already adjusted the settings of the receiver. Which has made some
inprovements. Another technique used is diversity reception. This can be by
using muliple antennas spaced some distance apart.(as mentionned above) . With
the receiver automatically switching between them to minimise the interfered
signal. The other way is to have another antenna and receiver. Combining the
signal output from the receivers in a way to minimise the interfering signal.

A number of dual tuner dvb-t cards have this capability in the software. To
improve portable and mobile reception of dvb-t services. I'm sure some of the
forum software developers have already played with this or will do shortly. With
multiple usb receivers and omnidirectional antennas. You can make beam stearing
antenna/receiving systems.

All the best

Sent from Yahoo! Mail on Android


--------------------------------------------------------------------------------
*From: * s.lloydhughes@btopenworld.com <s.lloydhughes@btopenworld.com>;
*To: * SDRSharp@yahoogroups.co.uk <SDRSharp@yahoogroups.co.uk>;
brentfowlkes@comcast.net <brentfowlkes@comcast.net>;
s.lloydhughes@btopenworld.com <s.lloydhughes@btopenworld.com>;
*Subject: * Re: [SDRSharp] Re: RTL2832U & R820T
*Sent: * Tue, Sep 3, 2013 11:39:34 PM

Well by the time I wrote my reply you have had many more and have answered many
of the questions posed. I hope the spectrum planning for these dispatches has
been done well. Which will take into account most forms of enhanced propagation.
Or they may have problems themselves. Of course you may be lucky enough to have
a very tall mast or live on top of a mountain.

A good directional antenna of the correct polorization will help unless the
interfering source is in the same direction as the wanted signal.

All the best

Sent from Yahoo! Mail on Android


--------------------------------------------------------------------------------
*From: * s.lloydhughes@btopenworld.com <s.lloydhughes@btopenworld.com>;
*To: * SDRSharp@yahoogroups.co.uk <SDRSharp@yahoogroups.co.uk>;
brentfowlkes@comcast.net <brentfowlkes@comcast.net>;
*Subject: * Re: [SDRSharp] Re: RTL2832U & R820T
*Sent: * Tue, Sep 3, 2013 11:21:13 PM



Are you sure that you are picking up another Police Dispatch. Have you
identified the frequency, modulation type and the transmission site or sites?
Why is it at night and not during the day? Is it on any other frequecy? Is it
the plasma TV which is switched to watch the favorite TV programme at 8pm.
Monday to Friday? Or the heating boiler which switches on, now the nights are
getting longer and colder?

Unfortunately you have still not given full details of your set up. Where you
are? What frequency you are listenning on? What frequecy or frequencies the
interference is on? What antennas you are using. (other than one is a discone.
What is its design frequency range?) Including height above ground. Are there
any transmission masts near your receiving site?

By finding the answers to the questions above and checking the operation,
performance and setting of your antennas, equipment and software. You are more
likely to find and deal with the problem yourself. Or get a more focused
response from those members of the forum who know about receiver design and
performance. Spectum planning and regulation for your area. EMC and interfernce.

Make some measurements and observations over time. It will help you and others
find a solution to your problems?

All the best

Sent from Yahoo! Mail on Android


--------------------------------------------------------------------------------
*From: * brentcfowlkes <brentfowlkes@comcast.net>;
*To: * <SDRSharp@yahoogroups.co.uk>;
*Subject: * [SDRSharp] Re: RTL2832U & R820T
*Sent: * Tue, Sep 3, 2013 9:25:01 PM

Thanks Everybody For The Great Advise, I Guess I Should Have Explained
Everything In More Detail. This Interference Only Happens At Night. During The
Day Time Everything Is Perfect. I Have A Outdoor Scanner Discone Antenna Hooked
Up To The RTLSDR Dongle. But The Discone Antenna Is Not The Problem, At Night
The Interference Happens On Every Antenna I Have. In The SDRSharp Control Panel
I Have RTL AGC Unchecked And Tuner AGC Unchecked. I Have The RF Gain Level At 42
dB. The Filter Bandwidth Set At 5860 Any Lower And The Audio Becomes Inaudible.

--- In SDRSharp@yahoogroups.co.uk, "mule_ears" <bob4john@...> wrote:
>
> An old amateur radio axiom is that the most important part of a radio station
is the antenna. ie: if you have a total of ten dollars to spend, spend eight
dollars on the antenna and two on the radio.
>
> A little more information is needed to answer your question.
>
> What is the direction of each of the stations from your location? Can you
block out the digital station with a highly directional antenna?
>
> The digital station may be too powerful to block, even with a directional
antenna.
>
> The bandwidth you are using to receive may be too wide... try narrowing the
bandwidth and see if the two stations are actually on the same frequency... and
there are several online sites that will show you the assigned frequency of each
station... may not be exactly on the same frequency.. also, lower the gain of
the dongle. overdriving the dongle will distort the width of the signals, with
the strongest signal distorting much more than weaker signals.. it is not a
linear process. The stronger signal will distort exponentially more than the
weaker signals.
>
> As a rule, the FCC in the USA will not license two stations for the same
frequency when there is a high probablility that they will cause interference.
>
> I do not know of any way to separate the two signals with software. That will
need to be answered by one of the software experts.
>
>
> bobbie
> kd4lv
>
>
>
>
> --- In SDRSharp@yahoogroups.co.uk, "brentcfowlkes" <brentfowlkes@> wrote:
> >
> > I Am Using A Realtek RTL2832U & R820T On SDRSharp 1.0.0.1145
> >
> > I Have A Signal Interference When Listening To A Certain Frequency. The
Analog Frequency Police Dispatch Picks Up Great In My County Where I Live. But
There Is A Police Dispatch On The Same Freqency 3 Counties Away From Me That Is
Digital That When It Transmits It Takes Out The Analog Frequency I Am Listening
To In My County. How Do I Block Out The Digital Frequency That Is 3 Counties
Away? I Only Want To Listen To The Analog Frequency In My County.
> >
>




------------------------------------

Yahoo! Groups Links








Re: [SDRSharp] Re: RTL2832U & R820T

jdow <jdow@...>
 

You seem unaware of conditions on the various mountains in Southern
California such as Mt. Wilson, Mt. Lukens, santiago Peak, Sunset Ridge,
and innumerable others with commercial and ham repeaters all within
wavelengths of each other often sharing the same antenna installation
if feasible. The RF environment up there is hellish. Yet they seen to
be able to operate due to careful frequency coordination and repeater
designs. So one block away is nothing - zero - zip - nada - zilch.

None of that should distract from the fact you never said "on the same
frequency."

So far as I know the FCC will not issue licenses without proper frequency
coordination, which includes considerations for IMD as well as co-channel
type interference.

Think of telephone systems. They are closest to trunking systems. They
work on the basis that you almost never have all telephone lines busy.
Duty factor depends on time of day and can range from close to zero all
the way to utter overload in the case of disasters. For every 1000 phones
they might have a capacity for 10 or 30 or whatever telephone connections
at any given time. This seldom overloads. The two repeaters or bases on
the same frequency would possibly be coordinated due to channel saturation
in an area and still work on the basis that repeater input and output
frequencies are different, measures to prevent destructive overload exist,
and usage duty factors are low.

And at this point I stop the lecture because I don't feel like educating
you without getting paid for it.

{^_^}

On 2013/09/03 23:34, MCH wrote:
Funny. You claim I can't read, but then you state that things were not
mentioned when they were. I'll quote it in line here even though it's
still in the quoted text...

mule_ears wrote: "As a rule, the FCC in the USA will not license two
stations for the same frequency when there is a high probablility that
they will cause interference."

I wrote in reply: "I had a customer who was licensed for a repeater ONE
BLOCK AWAY from another user." The implication here is that any two
transmitters only one block away will interfere unless they are "in
house" systems that to not transmit outside the building. I didn't state
that before. I didn't think I had to put it in "first grade terms".

Yes, they were on the same frequency, as was mentioned in the original
claim I called 'bull' on. Again, reading would have revealed that.

So, radio expert, tell me how queueing theory applies to two
conventional repeaters. I know people are *supposed* to monitor to
co-channel users, but in real life that rarely happens. When both try to
talk at the same time, most often nobody hears anyone - especially when
the interference masks the CDCSS codes.

I don't recall who did the coordination, as this was about 10 years ago
or more, but it really doesn't matter. Did they do a horrible job? Of
course. That frequency should have never been proposed. BUT, the FCC
issued the license the same, so my original contention stands that it is
false that "the FCC in the USA will not license two stations for the
same frequency" (talking about in close proximity which was mentioned
previous to "mule_ears"'s reply). The FCC will issue ANY license the
coordinator approves regardless how much interference there will be or
how close they are - even one block away (which is a measurement of
distance, not frequency, as most people would know).

There is an exception in some bands, such as the "T-band" where there is
(or was) a 75 mile rule for co-channel use, but that rule may no longer
apply either. Of course, they are issuing no more new "T-band" licenses
at all for the past couple years.

Oh, and two repeaters that cover several miles will always interfere if
they are a block apart. Again, you are ignoring the laws of physics. And
while it may support your claims, it is a natural law which cannot be
broken as easily as you seem to believe. There is also Murphy's Law
which states that in such a situation both users will have to talk at
about the same time, and the delayed communication only extends the
interference in the time domain.

The interference only was resolved by the fact that one user took their
repeater off the air.

Oh, and as for "You MIGHT try doing some simple math on an expansion
from multiplying two sinewaves on different frequencies" please explain
how that applies to two sinewaves of the SAME frequency. We aren't
dealing with mixing or overload or intermod. Both transmitters were
stated to be on the same frequency (within the tolerance of the
oscillators of each transmitter).

Yes, he stated that reducing the gain helped, but that is inconsistent
with the laws of physics which demand that a stronger signal on the same
frequency will remain stronger no matter how much gain or loss is added
to the front end. Again, if you can nullify capture effect, PATENT THAT
ASAP because you will be a millionaire. If you don't want to, let me
know how to do that and I'll patent it because it defies the laws of
physics. Most likely the interference changed because the propagation
changed concurrently with the change in the front end gain.

I will state again that the proper way to resolve this issue is by using
a directional antenna to null the unwanted transmitter while retaining a
path (direct or indirect) to the desired transmitter. That solution even
has worked for other users, and I've used that technique many times
personally.

Joe M.

jdow wrote:
Have you ever studied up at all on queueing theory and the like? If
each user uses the frequency only sporadically they will hit each other
from time to time. But they won't particularly interfere with each
other unless somebody set them up very much wrong.

You have yet to declare if they were on the same frequency or just
nearby frequencies. All you said was "ONE BLOCK AWAY", which lacks
a definition in frequency terms.

Who did the frequency coordination studies?

{^_^}

On 2013/09/03 20:21, MCH wrote:
You've never been to a city? A block is around 500-2000 feet.

They were using different CDCSS codes, but at that close range it made
no difference at all. Interference is interference regardless of the
presence of any CTCSS/CDCSS. That's "Radio 101" knowledge.

And I don't know who said it was a ham frequency. I didn't.

For the record, nobody assigns ham frequencies. There are coordinations,
but those are not allocations. And I know very well who coordinates
frequencies (both ham and commercial).

Joe M.

jdow wrote:
He declared "ONE BLOCK AWAY". I've know idea what frequency separation
"ONE BLOCK AWAY" might be.

Also when usage is going to be short and infrequent messages frequencies
are often shared with different tones for tone squelch. These days most
such setups are members of a trunking system with many users sharing the
same smaller set of frequencies.

{^_-}

On 2013/09/03 15:36, mule_ears wrote:
Amateur radio repeater frequency allocations are not directly from the FCC....

Ask your local ELMER who assigns these freqs...


and put your Bull where it belongs..


bobbie
kd4lv



--- In SDRSharp@yahoogroups.co.uk, MCH <mch@...> wrote:
I call "bull" on this.

I had a customer who was licensed for a
repeater ONE BLOCK AWAY from another user.

Joe M.

mule_ears wrote:
As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference.

------------------------------------

Yahoo! Groups Links



Re: [SDRSharp] Re: RTL2832U & R820T

s.lloydhughes@btopenworld.com
 

"Of course you may be lucky enough to have a very tall mast or live on top of a mountain."

In a nice part of the Country was a big clue. Your radio horizon will be quite a distance away. Allowing you to receive vhf/uhf signals from far away. A directional antenna may help. If the interferer is from another direction. Or adjustiing the position of your antenna both in height and position. To null the received interfering signal. At the frequency you are using, a few inches to a few feet may be all that is required. Both vertically and or horizontally.

You have already adjusted the settings of the receiver. Which has made some inprovements. Another technique used is diversity reception. This can be by using muliple antennas spaced some distance apart.(as mentionned above) . With the receiver automatically switching between them to minimise the interfered signal. The other way is to have another antenna and receiver. Combining the signal output from the receivers in a way to minimise the interfering signal.

A number of dual tuner dvb-t cards have this capability in the software. To improve portable and mobile reception of dvb-t services. I'm sure some of the forum software developers have already played with this or will do shortly. With multiple usb receivers and omnidirectional antennas. You can make beam stearing antenna/receiving systems.

All the best

Sent from Yahoo! Mail on Android



From: s.lloydhughes@... ;
To: SDRSharp@... ; brentfowlkes@... ; s.lloydhughes@... ;
Subject: Re: [SDRSharp] Re: RTL2832U & R820T
Sent: Tue, Sep 3, 2013 11:39:34 PM

Well by the time I wrote my reply you have had many more and have answered many of the questions posed. I hope the spectrum planning for these dispatches has been done well. Which will take into account most forms of enhanced propagation. Or they may have problems themselves. Of course you may be lucky enough to have a very tall mast or live on top of a mountain.

A good directional antenna of the correct polorization will help unless the interfering source is in the same direction as the wanted signal.

All the best

Sent from Yahoo! Mail on Android



From: s.lloydhughes@... ;
To: SDRSharp@... ; brentfowlkes@... ;
Subject: Re: [SDRSharp] Re: RTL2832U & R820T
Sent: Tue, Sep 3, 2013 11:21:13 PM



Are you sure that you are picking up another Police Dispatch. Have you identified the frequency, modulation type and the transmission site or sites? Why is it at night and not during the day? Is it on any other frequecy? Is it the plasma TV which is switched to watch the favorite TV programme at 8pm. Monday to Friday? Or the heating boiler which switches on, now the nights are getting longer and colder?

Unfortunately you have still not given full details of your set up. Where you are? What frequency you are listenning on? What frequecy or frequencies the interference is on? What antennas you are using. (other than one is a discone. What is its design frequency range?) Including height above ground. Are there any transmission masts near your receiving site?

By finding the answers to the questions above and checking the operation, performance and setting of your antennas, equipment and software. You are more likely to find and deal with the problem yourself. Or get a more focused response from those members of the forum who know about receiver design and performance. Spectum planning and regulation for your area. EMC and interfernce.

Make some measurements and observations over time. It will help you and others find a solution to your problems?

All the best

Sent from Yahoo! Mail on Android



From: brentcfowlkes ;
To: ;
Subject: [SDRSharp] Re: RTL2832U & R820T
Sent: Tue, Sep 3, 2013 9:25:01 PM

Thanks Everybody For The Great Advise, I Guess I Should Have Explained Everything In More Detail. This Interference Only Happens At Night. During The Day Time Everything Is Perfect. I Have A Outdoor Scanner Discone Antenna Hooked Up To The RTLSDR Dongle. But The Discone Antenna Is Not The Problem, At Night The Interference Happens On Every Antenna I Have. In The SDRSharp Control Panel I Have RTL AGC Unchecked And Tuner AGC Unchecked. I Have The RF Gain Level At 42 dB. The Filter Bandwidth Set At 5860 Any Lower And The Audio Becomes Inaudible.


--- In SDRSharp@..., "mule_ears" wrote:
>
> An old amateur radio axiom is that the most important part of a radio station is the antenna. ie: if you have a total of ten dollars to spend, spend eight dollars on the antenna and two on the radio.
>
> A little more information is needed to answer your question.
>
> What is the direction of each of the stations from your location? Can you block out the digital station with a highly directional antenna?
>
> The digital station may be too powerful to block, even with a directional antenna.
>
> The bandwidth you are using to receive may be too wide... try narrowing the bandwidth and see if the two stations are actually on the same frequency... and there are several online sites that will show you the assigned frequency of each station... may not be exactly on the same frequency.. also, lower the gain of the dongle. overdriving the dongle will distort the width of the signals, with the strongest signal distorting much more than weaker signals.. it is not a linear process. The stronger signal will distort exponentially more than the weaker signals.
>
> As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference.
>
> I do not know of any way to separate the two signals with software. That will need to be answered by one of the software experts.
>
>
> bobbie
> kd4lv
>
>
>
>
> --- In SDRSharp@..., "brentcfowlkes" wrote:
> >
> > I Am Using A Realtek RTL2832U & R820T On SDRSharp 1.0.0.1145
> >
> > I Have A Signal Interference When Listening To A Certain Frequency. The Analog Frequency Police Dispatch Picks Up Great In My County Where I Live. But There Is A Police Dispatch On The Same Freqency 3 Counties Away From Me That Is Digital That When It Transmits It Takes Out The Analog Frequency I Am Listening To In My County. How Do I Block Out The Digital Frequency That Is 3 Counties Away? I Only Want To Listen To The Analog Frequency In My County.
> >
>




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Re: USB: 4 ports or external powered port ?

pmr1wrt
 

Hi Bobbie,

The maximum of dongles i used with my 4 port usb hub is 2.
I used a Sweex 4 port hub, it's very small and has only 1 Amp power supply. (I will buy me some better hub, with more power.)
I find out when i connected the dongles (E4000 + R820T) directly into the hub, i had receive problems on swl with the R820T.
The usb hub picks-up strong fm broadcast signals on swl.
Normally i had never this problem.
So i connected two 1.8 mtr. extension usb cables between hub and the dongles and the trouble was over.

The hub was connected to the front usb of my Dell computer.
My up-converter was also connected to a front usb connector.
These had a much better cable with ferrite in begin and end of the cable.

Unfortunately my up-converter is defect, the 100 MHz oscillator works and that is all.
Just back to old school: listen swl with the Kenwood TS-520S or AOR8000.

Bobbie, i changed often my hardware configuration.
Always searching for the best results and solutions.

Rene (Netherlands/Groningen)

--- In SDRSharp@yahoogroups.co.uk, "mule_ears" <bob4john@...> wrote:


Hi Rene

How many dongles are your using with your 4 port hub ?

bobbie
kd4lv


Re: [SDRSharp] Re: USB: 4 ports or external powered port ?

David J Taylor
 

Continuing my guesswork.
In TV operation the RTL chip reads the up to 8MHz wide data stream.
Extracts the packets relevant to the required TV (or radio) programme and sends them to the computer via USB.
2.4Msps is more than enough for a single programme.

So could this be the limit when used in SDR IQ mode? The RTL is not designed to output at a faster rate.

73 Alan G4ZFQ
==================================

That was also my conclusion, Alan. Either an output rate limit, or internal processing rate limit. IIRC the chip was not designed to operate in the IQ mode - it was more a debugging mode. Something like that.

73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk


Re: [SDRSharp] Re: USB: 4 ports or external powered port ?

Alan
 

----- Original Message -----
Subject: Re: [SDRSharp] Re: USB: 4 ports or external powered port ?


The problem above 2.4 Msps is within the dongle itself. The rtlsdr.dll
driver seems to be relatively clean and capable of fast transfers. And
that limit seems to be a hard upper limit with virtually all machines.
My barnburner won't suck in more than 2.4 Msps out of my dongles, one at
a time or all together. My laptop is also somewhat hypertrophied. (It has
a full development environment. I find that gets used if problems happen
on a convention floor. I fix it when I get back to the hotel room. And
fast compilations help the repair process.) It has a 3.0 port. And even
that won't pull more than 2.4 Msps. So my somewhat rational confusion is
that the limitation is within the dongles despite what some documentation
suggests is possible. (Or else it is within the WinUSB component....)
Continuing my guesswork.
In TV operation the RTL chip reads the up to 8MHz wide data stream.
Extracts the packets relevant to the required TV (or radio) programme and sends them to the computer via USB.
2.4Msps is more than enough for a single programme.

So could this be the limit when used in SDR IQ mode? The RTL is not designed to output at a faster rate.

73 Alan G4ZFQ


Re: [SDRSharp] RTL2832U & R820T

David J Taylor
 

I Am Using A Realtek RTL2832U & R820T On SDRSharp 1.0.0.1145

I Have A Signal Interference When Listening To A Certain Frequency. The Analog Frequency Police Dispatch Picks Up Great In My County Where I Live. But There Is A Police Dispatch On The Same Freqency 3 Counties Away From Me That Is Digital That When It Transmits It Takes Out The Analog Frequency I Am Listening To In My County. How Do I Block Out The Digital Frequency That Is 3 Counties Away? I Only Want To Listen To The Analog Frequency In My County.
=============================================

Your messages are more difficult to read than they need to be - as you insist on capitalising every word. This is not needed in English. Perhaps you could avoid this practice - if possible.

David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk


Re: [SDRSharp] Re: RTL2832U & R820T

Joe M.
 

Funny. You claim I can't read, but then you state that things were not mentioned when they were. I'll quote it in line here even though it's still in the quoted text...

mule_ears wrote: "As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference."

I wrote in reply: "I had a customer who was licensed for a repeater ONE BLOCK AWAY from another user." The implication here is that any two transmitters only one block away will interfere unless they are "in house" systems that to not transmit outside the building. I didn't state that before. I didn't think I had to put it in "first grade terms".

Yes, they were on the same frequency, as was mentioned in the original claim I called 'bull' on. Again, reading would have revealed that.

So, radio expert, tell me how queueing theory applies to two conventional repeaters. I know people are *supposed* to monitor to co-channel users, but in real life that rarely happens. When both try to talk at the same time, most often nobody hears anyone - especially when the interference masks the CDCSS codes.

I don't recall who did the coordination, as this was about 10 years ago or more, but it really doesn't matter. Did they do a horrible job? Of course. That frequency should have never been proposed. BUT, the FCC issued the license the same, so my original contention stands that it is false that "the FCC in the USA will not license two stations for the same frequency" (talking about in close proximity which was mentioned previous to "mule_ears"'s reply). The FCC will issue ANY license the coordinator approves regardless how much interference there will be or how close they are - even one block away (which is a measurement of distance, not frequency, as most people would know).

There is an exception in some bands, such as the "T-band" where there is (or was) a 75 mile rule for co-channel use, but that rule may no longer apply either. Of course, they are issuing no more new "T-band" licenses at all for the past couple years.

Oh, and two repeaters that cover several miles will always interfere if they are a block apart. Again, you are ignoring the laws of physics. And while it may support your claims, it is a natural law which cannot be broken as easily as you seem to believe. There is also Murphy's Law which states that in such a situation both users will have to talk at about the same time, and the delayed communication only extends the interference in the time domain.

The interference only was resolved by the fact that one user took their repeater off the air.

Oh, and as for "You MIGHT try doing some simple math on an expansion from multiplying two sinewaves on different frequencies" please explain how that applies to two sinewaves of the SAME frequency. We aren't dealing with mixing or overload or intermod. Both transmitters were stated to be on the same frequency (within the tolerance of the oscillators of each transmitter).

Yes, he stated that reducing the gain helped, but that is inconsistent with the laws of physics which demand that a stronger signal on the same frequency will remain stronger no matter how much gain or loss is added to the front end. Again, if you can nullify capture effect, PATENT THAT ASAP because you will be a millionaire. If you don't want to, let me know how to do that and I'll patent it because it defies the laws of physics. Most likely the interference changed because the propagation changed concurrently with the change in the front end gain.

I will state again that the proper way to resolve this issue is by using a directional antenna to null the unwanted transmitter while retaining a path (direct or indirect) to the desired transmitter. That solution even has worked for other users, and I've used that technique many times personally.

Joe M.

jdow wrote:

Have you ever studied up at all on queueing theory and the like? If
each user uses the frequency only sporadically they will hit each other
from time to time. But they won't particularly interfere with each
other unless somebody set them up very much wrong.
You have yet to declare if they were on the same frequency or just
nearby frequencies. All you said was "ONE BLOCK AWAY", which lacks
a definition in frequency terms.
Who did the frequency coordination studies?
{^_^}
On 2013/09/03 20:21, MCH wrote:
You've never been to a city? A block is around 500-2000 feet.

They were using different CDCSS codes, but at that close range it made
no difference at all. Interference is interference regardless of the
presence of any CTCSS/CDCSS. That's "Radio 101" knowledge.

And I don't know who said it was a ham frequency. I didn't.

For the record, nobody assigns ham frequencies. There are coordinations,
but those are not allocations. And I know very well who coordinates
frequencies (both ham and commercial).

Joe M.

jdow wrote:
He declared "ONE BLOCK AWAY". I've know idea what frequency separation
"ONE BLOCK AWAY" might be.

Also when usage is going to be short and infrequent messages frequencies
are often shared with different tones for tone squelch. These days most
such setups are members of a trunking system with many users sharing the
same smaller set of frequencies.

{^_-}

On 2013/09/03 15:36, mule_ears wrote:
Amateur radio repeater frequency allocations are not directly from the FCC....

Ask your local ELMER who assigns these freqs...


and put your Bull where it belongs..


bobbie
kd4lv



--- In SDRSharp@yahoogroups.co.uk, MCH <mch@...> wrote:
I call "bull" on this.

I had a customer who was licensed for a
repeater ONE BLOCK AWAY from another user.

Joe M.

mule_ears wrote:
As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference.


Re: [SDRSharp] Re: RTL2832U & R820T

jdow <jdow@...>
 

Have you ever studied up at all on queueing theory and the like? If
each user uses the frequency only sporadically they will hit each other
from time to time. But they won't particularly interfere with each
other unless somebody set them up very much wrong.

You have yet to declare if they were on the same frequency or just
nearby frequencies. All you said was "ONE BLOCK AWAY", which lacks
a definition in frequency terms.

Who did the frequency coordination studies?

{^_^}

On 2013/09/03 20:21, MCH wrote:
You've never been to a city? A block is around 500-2000 feet.

They were using different CDCSS codes, but at that close range it made
no difference at all. Interference is interference regardless of the
presence of any CTCSS/CDCSS. That's "Radio 101" knowledge.

And I don't know who said it was a ham frequency. I didn't.

For the record, nobody assigns ham frequencies. There are coordinations,
but those are not allocations. And I know very well who coordinates
frequencies (both ham and commercial).

Joe M.

jdow wrote:
He declared "ONE BLOCK AWAY". I've know idea what frequency separation
"ONE BLOCK AWAY" might be.

Also when usage is going to be short and infrequent messages frequencies
are often shared with different tones for tone squelch. These days most
such setups are members of a trunking system with many users sharing the
same smaller set of frequencies.

{^_-}

On 2013/09/03 15:36, mule_ears wrote:
Amateur radio repeater frequency allocations are not directly from the FCC....

Ask your local ELMER who assigns these freqs...


and put your Bull where it belongs..


bobbie
kd4lv



--- In SDRSharp@yahoogroups.co.uk, MCH <mch@...> wrote:
I call "bull" on this.

I had a customer who was licensed for a
repeater ONE BLOCK AWAY from another user.

Joe M.

mule_ears wrote:
As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference.


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Re: [SDRSharp] RTL2832U & R820T

jdow <jdow@...>
 

Um, you REALLY need to learn how things work, Joe. He seems convinced
he's receiving something that odds are is beyond the horizon. He also
directly stated that reducing the gain helped mitigate the problem.
Do you ever read anything, Joe? Really?

For all the experience you claim your displayed knowledge betrays your
lack of basic expertise.

You MIGHT try doing some simple math on an expansion from multiplying
two sinewaves on different frequencies, expressed as sig = (x * sin( w1t )
+ y * sin( w2t )) by the first three terms of a Taylor series expansion
for distortion giving A * sig + B * sig^2 + C * sig^3. Then start playing
with values for the terms looking at things like cross modulation and
intermodulation distortion (both generally from the third order term).
See how they vary as you get further and further into overload.

Somebody as all knowing as you should be able to do that in your sleep.
Whether you can relate that to the real world is up for grabs.

{^_^} Joanne

On 2013/09/03 20:16, MCH wrote:
And it can make a stronger station weaker then the weak one?

I knew sooner or later you would debate the laws of physics.

BTW, if that works, you REALLY want to patent that
process, as it will totally nullify capture effect
and a lot of corporations would pay big bucks for that!

Joe M.

jdow wrote:
Hey, Joe, ever hear of overload? These dongles do NOT have huge dynamic
ranges, especially after passing the data from the dongles at 8 bits per
sample. Lowering the gain can drop interfering stations dramatically
faster than the interfered with stations.

{^_^} Joanne

On 2013/09/03 13:29, MCH wrote:
That would lower the gain on both stations resulting in the distant
station still being stronger. Your other suggestions are good, though.

Joe M.

siegfried jackstien wrote:
Lower the front end gain!


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Re: [SDRSharp] mono recording AF files

John
 

thankyou Muchly Vasili..

THAT plugin (once you take the trouble to translate Russian on the page
and find the zip file) is one super plugin !!
Thankfully the plugin itself is English.

Included in the plugin are:
Sample Format - 8 & 16 bit mono or stereo, 32 bit IEEE float
Sample rate - 8/16/32 kHz
Folder select - a choice of folder location
Audio/Baseband - audio stream or raw IQ
Don't write pause - said to be squelch controlled (not tested here yet)

Within the downloaded zip file is a dll that has to replace the current SDRsharp.waveRecorder.dll file.

Also, an option to edit the config file. To quote the author:
"In the configuration file line <add key="AutoStartRecording" value="False" /> manages autostart entries. If "False" is replaced by "True" record will start automatically after the launch of the receiver.
To simplify the installation can use the script."

I found that addition to the config to throw up an error flag when SDR# is loaded, otherwise it will load if you disregard the error... w/o that addition
the prog loads w/o fault, and operates as per normal.

The one thing that this writer has improved on, is that all the record settings
are saved when the program is restarted. Salutations (Приветствия) !!

And another nice addition is: as you click on different preset frequencies
the recorder writes another file with appropriate filemname. This has only been tested in one MODE as yet...be interesting if the recorded format also follows suit i.e. AM; FM; CW ect.

Well that my bit (pardon pun)

73 John

On 03-Sep-13 6:02 PM, belvasi wrote:
Mono record is missing.

Use the modified plugin records http://sdrts.amoti.ru/plagin_zapisi_wrp_
There is a mono recording and decrease sampling rate for savings.

Vasili.


03.09.2013, 03:47, "John"<gielisj@westnet.com.au>:
Hello Group,

I would like to know how the SDR# software
is instructed to record in mono, as against stereo.
It seems a total waste of time recording in stereo :)

Is the mono setting completely reliant on the type/brand
of soundcard, or is there a setting in the config file?

73 John

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Re: [SDRSharp] Re: RTL2832U & R820T

Joe M.
 

You've never been to a city? A block is around 500-2000 feet.

They were using different CDCSS codes, but at that close range it made no difference at all. Interference is interference regardless of the presence of any CTCSS/CDCSS. That's "Radio 101" knowledge.

And I don't know who said it was a ham frequency. I didn't.

For the record, nobody assigns ham frequencies. There are coordinations, but those are not allocations. And I know very well who coordinates frequencies (both ham and commercial).

Joe M.

jdow wrote:

He declared "ONE BLOCK AWAY". I've know idea what frequency separation
"ONE BLOCK AWAY" might be.
Also when usage is going to be short and infrequent messages frequencies
are often shared with different tones for tone squelch. These days most
such setups are members of a trunking system with many users sharing the
same smaller set of frequencies.
{^_-}
On 2013/09/03 15:36, mule_ears wrote:
Amateur radio repeater frequency allocations are not directly from the FCC....

Ask your local ELMER who assigns these freqs...


and put your Bull where it belongs..


bobbie
kd4lv



--- In SDRSharp@yahoogroups.co.uk, MCH <mch@...> wrote:
I call "bull" on this.

I had a customer who was licensed for a
repeater ONE BLOCK AWAY from another user.

Joe M.

mule_ears wrote:
As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference.


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Re: [SDRSharp] RTL2832U & R820T

Joe M.
 

And it can make a stronger station weaker then the weak one?

I knew sooner or later you would debate the laws of physics.

BTW, if that works, you REALLY want to patent that
process, as it will totally nullify capture effect
and a lot of corporations would pay big bucks for that!

Joe M.

jdow wrote:

Hey, Joe, ever hear of overload? These dongles do NOT have huge dynamic
ranges, especially after passing the data from the dongles at 8 bits per
sample. Lowering the gain can drop interfering stations dramatically
faster than the interfered with stations.
{^_^} Joanne
On 2013/09/03 13:29, MCH wrote:
That would lower the gain on both stations resulting in the distant
station still being stronger. Your other suggestions are good, though.

Joe M.

siegfried jackstien wrote:
Lower the front end gain!
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Re: [SDRSharp] Re: RTL2832U & R820T

Joe M.
 

Whether the interference is intermittent
or not, the solution is still the same.

Don also posted that the same solution
I suggested worked for him.

If they are on the same frequency, changing
the gain will do zero to eliminate the interference.


Joe M.

brentcfowlkes wrote:

Thanks Everybody For The Great Advise, I Guess I Should Have Explained Everything In More Detail. This Interference Only Happens At Night. During The Day Time Everything Is Perfect. I Have A Outdoor Scanner Discone Antenna Hooked Up To The RTLSDR Dongle. But The Discone Antenna Is Not The Problem, At Night The Interference Happens On Every Antenna I Have. In The SDRSharp Control Panel I Have RTL AGC Unchecked And Tuner AGC Unchecked. I Have The RF Gain Level At 42 dB. The Filter Bandwidth Set At 5860 Any Lower And The Audio Becomes Inaudible.
--- In SDRSharp@yahoogroups.co.uk, "mule_ears" <bob4john@...> wrote:
An old amateur radio axiom is that the most important part of a radio station is the antenna. ie: if you have a total of ten dollars to spend, spend eight dollars on the antenna and two on the radio.

A little more information is needed to answer your question.
What is the direction of each of the stations from your location? Can you block out the digital station with a highly directional antenna?

The digital station may be too powerful to block, even with a directional antenna.
The bandwidth you are using to receive may be too wide... try narrowing the bandwidth and see if the two stations are actually on the same frequency... and there are several online sites that will show you the assigned frequency of each station... may not be exactly on the same frequency.. also, lower the gain of the dongle. overdriving the dongle will distort the width of the signals, with the strongest signal distorting much more than weaker signals.. it is not a linear process. The stronger signal will distort exponentially more than the weaker signals.

As a rule, the FCC in the USA will not license two stations for the same frequency when there is a high probablility that they will cause interference.
I do not know of any way to separate the two signals with software. That will need to be answered by one of the software experts.


bobbie
kd4lv




--- In SDRSharp@yahoogroups.co.uk, "brentcfowlkes" <brentfowlkes@> wrote:
I Am Using A Realtek RTL2832U & R820T On SDRSharp 1.0.0.1145

I Have A Signal Interference When Listening To A Certain Frequency. The Analog Frequency Police Dispatch Picks Up Great In My County Where I Live. But There Is A Police Dispatch On The Same Freqency 3 Counties Away From Me That Is Digital That When It Transmits It Takes Out The Analog Frequency I Am Listening To In My County. How Do I Block Out The Digital Frequency That Is 3 Counties Away? I Only Want To Listen To The Analog Frequency In My County.
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