Date   

Re: [SDR#] Filter(s) question

Siegfried Jackstien
 

As higher as you set the "order" (taps) as sharper the filter is (but as
more pc power you need) ... you will notice the difference only when you
receive cw signals on a crowded band (and use narrow filters)

With wide filter and no other station close you will not notice that much of
a difference (as you already found out)

Hth

Dg9bfc

Sigi

-----Ursprüngliche Nachricht-----
Von: SDRSharp@yahoogroups.co.uk [mailto:SDRSharp@yahoogroups.co.uk]
Gesendet: Montag, 23. Februar 2015 19:03
An: SDRSharp@yahoogroups.co.uk
Betreff: [SDR#] Filter(s) question



All,

a recent thread mentioned various 'filters' and 'ringing', and
reminded me of a question that I wanted to ask the experts here.

SDR# has 6 filters available in the drop-down box, but can anybody
tell me which is the best one to use (and why). I have tried
switching between different filter settings whilst listening to a
signal, and I can detect no discernible difference (by ear) between them.

And, in connection with the above ... just beneath the 'filter' box
there is a box labeled 'Order'. What is this used for? My is
currently set at 500, but are there other values that I could try (and
why).

Thanks,

+----------------------------------------+
Graham Tanner (G6SUQ).
West London, UK.




Filter(s) question

Graham Tanner
 

All,

a recent thread mentioned various 'filters' and 'ringing', and reminded me of a question that I wanted to ask the experts here.

SDR# has 6 filters available in the drop-down box, but can anybody tell me which is the best one to use (and why). I have tried switching between different filter settings whilst listening to a signal, and I can detect no discernible difference (by ear) between them.

And, in connection with the above ... just beneath the 'filter' box there is a box labeled 'Order'. What is this used for? My is currently set at 500, but are there other values that I could try (and why).

Thanks,


+----------------------------------------+
Graham Tanner (G6SUQ).
West London, UK.


Re: : Re: : AW: [SDR#] SDR# + AirSpy

Nando Pellegrini
 

I feel really uncomfortable in replying to you, i am not sure of what i have seen last time, it was not a warming up problem because i have been waiting long enough and for sure was completely wrong.
I tried again a while ago giving more than a reasonable time for warming up generator and airspy and the attached screen shot is the result.
The tuned signal is that from the generator (tuned at 1400.0000 Mhz while at the left there is a spurious signal exactly at 1.4 Ghz.(there are quite a few strong spurious signals especially on high frequencies.
The error seems to be close to 5Khz, i did not use the rubidium this time but the generator is very reliable with a +- 100 Hz uncertainty at this frequency, as long as the error is a stable and predictable figure i can take care of it.
I was using Airspy to receive the H line signal at 1420.4 and ,to make the observation meaningful is very important to be able to rebuild a frequency reference.
Beside the error in frequency calibration which is not so important after all what i find more limiting is the lack of a certain frequency reference in recorded files.
For what i have seen in the .wav file i did not find it except the reference in file name of the tuned frequency which is not enough once passed the samples trough an FFT process.
Any suggestion?
Another question, i do some some amateur radio astronomy observation, in addition to the hydrogen line, and have a need to know the exact value of the SDR sample rate. Now the question, let's suppose i can detect with a certain precision the frequency calibration error, i guess i can i use the variance between  theoretical and observed figures to calculate the real sample rate. Do you agree?
Thanks
nando


Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

Ralph A. Schmid, dk5ras
 

Yes, sure, but sometimes it is very helpful to hear this with ones own ears, to have an idea of the effects dimension. CW is very useful for this.

Ralph.

-----Original Message-----
From: SDRSharp@yahoogroups.co.uk
[mailto:SDRSharp@yahoogroups.co.uk]
Sent: Monday, February 23, 2015 12:44 PM
To: SDRSharp@yahoogroups.co.uk
Subject: Re: [SDR#] Re:: How do you decode morse from cube satellites in
SDR Sharp?

It's important for any digital mode. It closes your eyes in the vernacular. That
is to say it makes the process of making 1 or 0 decisions less reliable.

{^_^}

On 2015-02-23 02:16, 'Ralph A. Schmid, dk5ras' ralph@schmid.xxx [SDRSharp]
wrote:
Yep, frequency hopping of course has its issues with ringing filters :) In fact
it is quite enlightening playing with NF filters on a SDR...

Ralph.

-----Original Message-----
From: SDRSharp@yahoogroups.co.uk
[mailto:SDRSharp@yahoogroups.co.uk]
Sent: Sunday, February 22, 2015 10:51 PM
To: SDRSharp@yahoogroups.co.uk
Subject: Re: [SDR#] Re:: How do you decode morse from cube satellites
in SDR Sharp?

In SDRSharp try reducing the filter order number. That will result in
a softer filter which will ring less. That MAY be easier on the ear.

I'm not a CW sort by any stretch of any, even the weakest,
imagination. But, from experience with Gaussian filter shapes early
in my career and from the set of filter ringing curves I have, really
really sharp filters can be really really hard to work with due to
filter ringing. Gaussian filters have poor shape factors and quick
ring down. So that 60 dB behemoth somewhat near the weak signal you
want to copy won't keep ringing your filter as much.

It seems an SDR would be an excellent tool for exploring filter ideas
for CW. I suspect at least two disparate designs might be desired
depending on conditions.
But, do note that the Gaussian filter with its poor adjacent channel
performance did far better than alternatives in fast frequency
hopping transceiver designs.

{^_^}


On 2015-02-22 13:40, Jerry Spring springjl@yahoo.com [SDRSharp] wrote:


I have been using both SDR# and HDSDR and find the tools for CW
better in HDSDR. There is a peak filter which sharpens the signal
and would be better for a CW reader. (I don't use readers so don't
have direct experience with them.) Best thing to do is try it out.

Jerry VE6TL



--------------------------------------------------------------------
--
---------- Posted by: Jerry Spring <springjl@yahoo.com>
--------------------------------------------------------------------
--
----------

------------------------------------
Posted by: jdow <jdow@earthlink.net>
------------------------------------


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

Yahoo Groups Links




------------------------------------
Posted by: "Ralph A. Schmid, dk5ras" <ralph@schmid.xxx>
------------------------------------


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

Yahoo Groups Links



------------------------------------
Posted by: jdow <jdow@earthlink.net>
------------------------------------


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

Yahoo Groups Links



Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

jdow <jdow@...>
 

It's important for any digital mode. It closes your eyes in the vernacular. That is to say it makes the process of making 1 or 0 decisions less reliable.

{^_^}

On 2015-02-23 02:16, 'Ralph A. Schmid, dk5ras' ralph@schmid.xxx [SDRSharp] wrote:
Yep, frequency hopping of course has its issues with ringing filters :) In fact it is quite enlightening playing with NF filters on a SDR...

Ralph.

-----Original Message-----
From: SDRSharp@yahoogroups.co.uk
[mailto:SDRSharp@yahoogroups.co.uk]
Sent: Sunday, February 22, 2015 10:51 PM
To: SDRSharp@yahoogroups.co.uk
Subject: Re: [SDR#] Re:: How do you decode morse from cube satellites in
SDR Sharp?

In SDRSharp try reducing the filter order number. That will result in a softer
filter which will ring less. That MAY be easier on the ear.

I'm not a CW sort by any stretch of any, even the weakest, imagination. But,
from experience with Gaussian filter shapes early in my career and from the
set of filter ringing curves I have, really really sharp filters can be really really
hard to work with due to filter ringing. Gaussian filters have poor shape
factors and quick ring down. So that 60 dB behemoth somewhat near the
weak signal you want to copy won't keep ringing your filter as much.

It seems an SDR would be an excellent tool for exploring filter ideas for CW. I
suspect at least two disparate designs might be desired depending on
conditions.
But, do note that the Gaussian filter with its poor adjacent channel
performance did far better than alternatives in fast frequency hopping
transceiver designs.

{^_^}


On 2015-02-22 13:40, Jerry Spring springjl@yahoo.com [SDRSharp] wrote:


I have been using both SDR# and HDSDR and find the tools for CW better
in HDSDR. There is a peak filter which sharpens the signal and would
be better for a CW reader. (I don't use readers so don't have direct
experience with them.) Best thing to do is try it out.

Jerry VE6TL



----------------------------------------------------------------------
---------- Posted by: Jerry Spring <springjl@yahoo.com>
----------------------------------------------------------------------
----------

------------------------------------
Posted by: jdow <jdow@earthlink.net>
------------------------------------


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

Yahoo Groups Links




------------------------------------
Posted by: "Ralph A. Schmid, dk5ras" <ralph@schmid.xxx>
------------------------------------


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

Yahoo Groups Links



Re: [SDR#] Email problem

Alberto I2PHD
 

On 2/23/2015 1:42 AM, Doug dmcgarrett@... [SDRSharp] wrote:

The @  symbol is not an ampersand. @ is usually called just "at sign." 
And ampersand is this thing: &  so if your mail had & instead of @
it would not be delivered
You are right. My fault. I wrote "ampersand", but what I had in mind was the "at sign".
But the email address had correctly an "at sign" in it.

--
73 Alberto I2PHD
Credo Ut Intelligam






This email has been checked for viruses by Avast antivirus software.
www.avast.com



Re: [SDR#] Email problem

Alberto I2PHD
 

On 2/23/2015 1:39 AM, jdow wrote:

Betcha it's mishkasat (at) yahoo.co.uk

Correct. He contacted me again and that is actually his email address.
But his original message was missing the final .uk in the return address...


--
73 Alberto I2PHD
Credo Ut Intelligam






This email has been checked for viruses by Avast antivirus software.
www.avast.com



Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

Ralph A. Schmid, dk5ras
 

Yep, frequency hopping of course has its issues with ringing filters :) In fact it is quite enlightening playing with NF filters on a SDR...

Ralph.

-----Original Message-----
From: SDRSharp@yahoogroups.co.uk
[mailto:SDRSharp@yahoogroups.co.uk]
Sent: Sunday, February 22, 2015 10:51 PM
To: SDRSharp@yahoogroups.co.uk
Subject: Re: [SDR#] Re:: How do you decode morse from cube satellites in
SDR Sharp?

In SDRSharp try reducing the filter order number. That will result in a softer
filter which will ring less. That MAY be easier on the ear.

I'm not a CW sort by any stretch of any, even the weakest, imagination. But,
from experience with Gaussian filter shapes early in my career and from the
set of filter ringing curves I have, really really sharp filters can be really really
hard to work with due to filter ringing. Gaussian filters have poor shape
factors and quick ring down. So that 60 dB behemoth somewhat near the
weak signal you want to copy won't keep ringing your filter as much.

It seems an SDR would be an excellent tool for exploring filter ideas for CW. I
suspect at least two disparate designs might be desired depending on
conditions.
But, do note that the Gaussian filter with its poor adjacent channel
performance did far better than alternatives in fast frequency hopping
transceiver designs.

{^_^}


On 2015-02-22 13:40, Jerry Spring springjl@yahoo.com [SDRSharp] wrote:


I have been using both SDR# and HDSDR and find the tools for CW better
in HDSDR. There is a peak filter which sharpens the signal and would
be better for a CW reader. (I don't use readers so don't have direct
experience with them.) Best thing to do is try it out.

Jerry VE6TL



----------------------------------------------------------------------
---------- Posted by: Jerry Spring <springjl@yahoo.com>
----------------------------------------------------------------------
----------

------------------------------------
Posted by: jdow <jdow@earthlink.net>
------------------------------------


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

Yahoo Groups Links



Re: [SDR#] How do you decode morse from cube satellites in SDR Sharp?

Ralph A. Schmid, dk5ras
 

I tune to the frequency, take a sheet of paper and a pencil, and I simply start writing it down.

 

SCNR :-)

 

Ralph.

 

From: SDRSharp@... [mailto:SDRSharp@...]
Sent: Sunday, February 22, 2015 9:57 AM
To: SDRSharp@...
Subject: [SDR#] How do you decode morse from cube satellites in SDR Sharp?

 




How do you decode morse code from cube satellites in SDR Sharp?

 

What plug in do you need?

 

Has anyone had experience with HDSDR software, with this software is better for more code decoding and would it be compatible with orbitron tracking plug ins?

 





Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

Peter 2E1FOV
 

here is the link SDRconsole V2.3 have fun

http://v2.sdr-radio.com/Download.aspx

73 s good dx
Pete 2E1FOV

On Sun, Feb 22, 2015 at 9:08 PM, OCSRC ocsrc@... [SDRSharp] <SDRSharp@...> wrote:
 



Where can I find SDRconsole to download it ?
 
Thanks
 
Bill
KC2OVX
 
----- Original Message -----
Sent: Sunday, February 22, 2015 2:20 PM
Subject: Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

 

I use SDRconsole for cube satellites and weather sats and iss and many others it was very easy to setup and it auto adjusts for Doppler
 then just use virtual cable to forward the audio to your CW decoder or decode in SDRconsole

On Sun, Feb 22, 2015 at 12:27 PM, philobarb@... [SDRSharp] <SDRSharp@...> wrote:
 


SDR Console V1.5 build 1425 has inbuilt Digital Modes decoding, including CW.
It interfaces directly with FCD Pro ( but not Pro Plus ).

It also has inbuilt satellite tracking and Doppler correction.

Just a thought.

Pete

---In SDRSharp@..., wrote :

How do you decode morse code from cube satellites in SDR Sharp?


What plug in do you need?


Has anyone had experience with HDSDR software, with this software is better for more code decoding and would it be compatible with orbitron tracking plug ins?





Re: [SDR#] Re:: Low audio with Version 1332

Joe M.
 

If that is the case, may I suggest the reported dB
level be adjusted rather than the actual volume level?

Joe M.

On 2/22/2015 10:52 AM, eb4apl@gmail.com [SDRSharp] wrote:


Hi,

I measured the audio output versus slider setting and I fully agree, the
output changes 20 dB when the setting is changed 10 dB. I also noticed
that the output saturates above the 55 dB setting but it probably
depends of the hardware receiver used.

73 de Ignacio, EB4APL


---In SDRSharp@yahoogroups.co.uk, <eb4apl@...> wrote :

Obviously I was referring to the loss of volume in the previous version,
I didn't checked the gain hints because I never had used them.
Tomorrow I will try to repeat your measurements and I'll inform of my
results.

73 de Ignacio EB4APL


El 21/02/2015 a las 19:43, 'David J Taylor' david-taylor@...
<mailto:david-taylor@...> [SDRSharp] escribió:

Here says 1333 and the .exe and other files changed. Also the volume
problem has been corrected.

73 de Ignacio EB4APL
======================================

Louder, yes, but I believe that the gain hints on the volume
control are
wrong. Change the gain setting from 43 dB to 53 dB, for example,
and the
audio output increases by 20 dB, not by 10 dB. Perhaps someone
else would
like to measure this to confirm.

It would be less misleading if this were to be corrected.

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



No virus found in this message.
Checked by AVG - www.avg.com <http://www.avg.com>
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Re: [SDR#] Email problem

doug
 

On 02/22/2015 06:58 PM, Alberto I2PHD i2phd@weaksignals.com [SDRSharp] wrote:
I have been contacted from (apparently) a reader of this forum with a request.
I answered, but the return address seems to not exist... it was mishkasat (at) yahoo.com
of course with the (at) changed with the ampersand.

If the originator of that message wants my answer, please send a working email address

--
/*73 Alberto I2PHD*
Credo Ut Intelligam

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<http://www.avast.com/>

This email has been checked for viruses by Avast antivirus software.
www.avast.com <http://www.avast.com/>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Posted by: Alberto I2PHD <i2phd@weaksignals.com>
The @ symbol is not an ampersand. @ is usually called just "at sign." And ampersand is this thing: & so if your mail had & instead of @
it would not be delivered.

--doug


Re: [SDR#] Email problem

jdow <jdow@...>
 

Betcha it's mishkasat (at) yahoo.co.uk

{^_^}

On 2015-02-22 15:58, Alberto I2PHD i2phd@weaksignals.com [SDRSharp] wrote:


I have been contacted from (apparently) a reader of this forum with a request.
I answered, but the return address seems to not exist... it was mishkasat (at)
yahoo.com
of course with the (at) changed with the ampersand.

If the originator of that message wants my answer, please send a working email
address

--
/*73 Alberto I2PHD*
Credo Ut Intelligam



/


--------------------------------------------------------------------------------
<http://www.avast.com/>

This email has been checked for viruses by Avast antivirus software.
www.avast.com <http://www.avast.com/>




--------------------------------------------------------------------------------
Posted by: Alberto I2PHD <i2phd@weaksignals.com>
--------------------------------------------------------------------------------


Email problem

Alberto I2PHD
 

I have been contacted from (apparently) a reader of this forum with a request.
I answered, but the return address seems to not exist... it was mishkasat (at) yahoo.com
of course with the (at) changed with the ampersand.

If the originator of that message wants my answer, please send a working email address

--
73 Alberto I2PHD
Credo Ut Intelligam






This email has been checked for viruses by Avast antivirus software.
www.avast.com



Re: [SDR#] Usual error message when using the fcd pro + ?

jdow <jdow@...>
 

On 2015-02-22 13:50, 'Alan' alan4alan@googlemail.com [SDRSharp] wrote:
Original Message -----
Subject: [SDR#] Usual error message when using the fcd pro + ?


When using SDR# with the .dll from the HDSDR site I get the following message on start up
SDR program not filly supported
SDR program does not allow full control of the FCPpro+ !
Full control requires an SDR program with support for
*RF & IF gain

I don't see where to control gain etc >
What am i doing wrong
The DLL is for HDSDR. Gives easy access to the controls only in HDSDR.
You do not need one for SDR#, it comes with it. But the controls are in the config panel.

Alan


------------------------------------
Posted by: "Alan" <alan4alan@googlemail.com>
------------------------------------
I note he wants separate control over stage gains. I have an rtlsdr.dll and an appropriate rtlsdr usb dll for SDRSharp. I offered to let Youssef look at it. He's apparently declined.

There is a dll out there which allows individual stage gain control from Basil.

http://www.rtl-sdr.ru/page/novaja-modifikacija-sdr-rtls-sdr-drajvera

His ONLY allows individual stage gains and has been blessed by Youssef to the extent that Youssef told him how to do the live sample rate change.

Mine allows for three gain profiles as well, the current compromise profile, a profile optimized for IMD (to an almost ridiculous level), and a profile optimized for sensitivity. I tend to prefer the latter for casual use. The individual gains are "annoying" to use. (His also needs a more modern rtlsdr.dll than comes from the default site. His article in the link above points to one such.

{^_^} Joanne


Re: How do you decode morse from cube satellites in SDR Sharp?

Alberto I2PHD
 

On 2/22/2015 10:50 PM, jdow jdow@... [SDRSharp] wrote:

It seems an SDR would be an excellent tool for exploring filter ideas for CW. I
suspect at least two disparate designs might be desired depending on conditions.
But, do note that the Gaussian filter with its poor adjacent channel performance
did far better than alternatives in fast frequency hopping transceiver designs.

I don't know if LC and Mario (the authors of HDSDR) did change the algorithm of
the CW Peak filter of Winrad, when transforming it into HDSDR.

If the algorithm is remained the same, this is the shape of the CW Peak in HDSDR :



Essentially it is an IIR resonator, with two conjugates poles whose distance from the
unitary circle can be dynamically adjusted with a slider. Much effective indeed for filtering
CW signals

--
73 Alberto I2PHD
Credo Ut Intelligam






This email has been checked for viruses by Avast antivirus software.
www.avast.com



Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

jdow <jdow@...>
 

In SDRSharp try reducing the filter order number. That will result in a softer filter which will ring less. That MAY be easier on the ear.

I'm not a CW sort by any stretch of any, even the weakest, imagination. But, from experience with Gaussian filter shapes early in my career and from the set of filter ringing curves I have, really really sharp filters can be really really hard to work with due to filter ringing. Gaussian filters have poor shape factors and quick ring down. So that 60 dB behemoth somewhat near the weak signal you want to copy won't keep ringing your filter as much.

It seems an SDR would be an excellent tool for exploring filter ideas for CW. I suspect at least two disparate designs might be desired depending on conditions. But, do note that the Gaussian filter with its poor adjacent channel performance did far better than alternatives in fast frequency hopping transceiver designs.

{^_^}

On 2015-02-22 13:40, Jerry Spring springjl@yahoo.com [SDRSharp] wrote:


I have been using both SDR# and HDSDR and find the tools for CW better in
HDSDR. There is a peak filter which sharpens the signal and would be better for
a CW reader. (I don't use readers so don't have direct experience with them.)
Best thing to do is try it out.

Jerry VE6TL


--------------------------------------------------------------------------------
Posted by: Jerry Spring <springjl@yahoo.com>
--------------------------------------------------------------------------------


Re: [SDR#] Usual error message when using the fcd pro + ?

Alan
 

Original Message -----
Subject: [SDR#] Usual error message when using the fcd pro + ?


When using SDR# with the .dll from the HDSDR site I get the following message on start up
SDR program not filly supported
SDR program does not allow full control of the FCPpro+ !
Full control requires an SDR program with support for
*RF & IF gain
I don't see where to control gain etc >
What am i doing wrong
The DLL is for HDSDR. Gives easy access to the controls only in HDSDR.
You do not need one for SDR#, it comes with it. But the controls are in the config panel.

Alan


Re: [SDR#] Re:: How do you decode morse from cube satellites in SDR Sharp?

Jerry Spring <springjl@...>
 

I have been using both SDR# and HDSDR and find the tools for CW better in HDSDR.  There is a peak filter which sharpens the signal and would be better for a CW reader.  (I don't use readers so don't have direct experience with them.)  Best thing to do is try it out. 

Jerry VE6TL


Re: : How do you decode morse from cube satellites in SDR Sharp?

bob johnson