Date   

Re: airspy HF + availability to public #airspyhfplus

Leif Asbrink
 

Hi Yussef,

prog" <info@sdrsharp.com> wrote:

The 6 dB gain reduction might bring the analog noise below the
ADC noise in which case dynamic range would suffer.
This can never happen by design. Many AGC loops are involved
to ensure optimal SNR and available dynamic range. The real
concern is the DR of the analog chain.

The output is 768 KSPS IQ with 660 kHz alias-free.
The DDC and the analog filters can be configured to
output more bandwidth at the cost of much less usable
dynamic range.
I do not understand this statement. As a general statement
it is incorrect and it would be interesting to know
something about why the Airspy HF+ has thais peculiar
behaviour.

If you would double the sampling rate to 1536 kHz for
an alias-free range of perhaps 1260 kHz, dynamic range
as measured with a strong and a weak signal separated
by 25 kHz or 100 kHz should not change. Both signals
would be within the analog passband in both cases
which implicates that all AGC loops will have the
same state in both cases with only the single strong
signal affecting the AGC.

The same with an IM3 test where both signals as well
as the IM3 products are within the analog passband.

The drawback should be that with twice the analog
bandwidth, the peak signal level would be 6 dB
higher but the analog noise floor would be the same
so a 6 dB better IP3 would be required for for
the same performance in terms of freedom from
false signals caused by intermodulation.


73

Leif


Re: SpyServer RTL's Direct Sampling? #RTL #spyserver

matteo cantarella
 

Well, knowing that it is possible is at least a start! =) 

Congrats, SDR# package is an excellent piece of software, absolutely love it and the constant support/update effort you're putting in it!


Re: SpyServer RTL's Direct Sampling? #RTL #spyserver

prog
 

Possible, but not planned. No time to code/test it.


Re: New Firmware for Airspy R2?

prog
 

Nothing planned yet. Use the recommended sample rate with the decimation.


New Firmware for Airspy R2?

Ruben Navarro Huedo (EA5BZ)
 

Hello:
I have the problem with 2.5MSPS described under Quick Start Guide.: http://airspy.com/quickstart/
>> In some PCs, the experimental 2.5MSPS mode is vulnerable to USB noise. This will be improved with further firmware updates.

Will we have a new firmware solving it?

Thank's a lot.


Re: Spyserver & Bias-Tee

Greg Ella
 

Hi Don,

The bias tee puts a low voltage low current DC source across the antenna connector for whatever you want to use it for.  It will power a standard OEM GPS puck antenna with a built in preamp, or a SpyVerter HF upconverter.  I think it will also power the LNA4ALL preamp.  It could also be used with a transistor buffered relay to do antenna switching.  I think it is short circuit protected, but you would not want it enabled with a DC shorted antenna like a folded dipole, at best you would be wasting USB power and generating unnecessary heat in the radio.

Greg Ella
AD0JP

On Mon, Oct 9, 2017 at 9:37 AM, <wa2swxdm@...> wrote:
Thanks much!  That did the trick.  A quick question about the bias tee setting.  It looks like that allows the matching of an active (amplified) antenna to the dongle.  I am guessing this should not matter much as I am using a mini-G5RV with it.  Is this correct?

Thanks,

Don
Wa2swx



SpyServer RTL's Direct Sampling? #RTL #spyserver

matteo cantarella
 

Hi guys,

As I rolled out from SDR-console v2 I've set up a Public SpyServer (kant-zone.ddns.net port: 7999), the receiver is located in Italy 60km North of Rome.
So far I've been impressed by how well it works with all the plugins,
however, I was wondering if there's any chance to switch the RTL dongle to Direct Sampling on the Q branch remotely on SpyServer as my setup will probably include HF bands in the future.

So, Is it possible to do it or maybe it will be one time? 

Thanks! =) 


Re: Spyserver & Bias-Tee

Don Meyerhoff
 

Thanks much!  That did the trick.  A quick question about the bias tee setting.  It looks like that allows the matching of an active (amplified) antenna to the dongle.  I am guessing this should not matter much as I am using a mini-G5RV with it.  Is this correct?

Thanks,

Don
Wa2swx


Re: Spyserver & Bias-Tee

prog
 

This is for an RTL-SDR dongle V3.
The bias-tee in the RTL V3 is not a standard feature for all RTL dongles and was not implemented. So you can imagine the setting has no effect at all.
But this doesn't explain why SDR# can't tune below 24MHz. Make sure you have these key properly set:

minimum_frequency = 0
maximum_frequency = 60000000
converter_offset = -120000000


Re: Spyserver & Bias-Tee

Don Meyerhoff
 

Hi,

Thanks for the quick response. This is for an RTL-SDR dongle V3.  The dongle I have I purchased from RTL-SDR.com and by setting the bias tee to on, which it seems to be able to do at the server side, I should be able to receive HF frequencies.  I de-commented the offset line in the spyserver.config file and changed the bias tee value to one and edited the device value to RTL-SDR. The problem is that when  I run SDR# on the client side my frequency indicator doesn't go below 24Mhz.  If the RTL-SDR dongle is connected directly to the client PC running SDR# then I can and I can receive the HF frequencies.  I'm not sure if it is something I'm not setting at the server or the client side.  Direct sampling doesn't show as being available when I chose the spyserver input source in SDR#.

Once the Airspy +HF comes out this should be a moot point for me.  I would just like to be able to tune around the HF spectrum for now with the dongle.
73
Don

On Mon, Oct 9, 2017 at 9:53 AM, prog <info@...> wrote:
I have no idea what you are trying to do, but if you need something that isn't already there, you are most probably doing something wrong.
The bias-tee option must only be set by the software interfacing directly with the Airspy - in this case, it's the server.
Did you just forget to set the frequency shift in the server?




--
Don Meyerhoff, D.B.A, C.P.P., CHS-IV
donmeyerhoff@...





Re: Spyserver & Bias-Tee

prog
 

I have no idea what you are trying to do, but if you need something that isn't already there, you are most probably doing something wrong.
The bias-tee option must only be set by the software interfacing directly with the Airspy - in this case, it's the server.
Did you just forget to set the frequency shift in the server?


Re: Spyserver & Bias-Tee

Don Meyerhoff
 

Keith:

I am having the same problem. I can set the bias tee to on on the server side but it doesn't seem to be recognized by the client side running SDR# with the spyserver input.  I've adjusted the config file as you have but my client side software won't duck below 24mhz.

V/r,
Don


Re: airspy HF + availability to public #airspyhfplus

Siegfried Jackstien
 

use your "normal" sdr software, route output to "dream" or "sodira" via a virtual audio cable (a soft that fools windoze to have another soundcard) ... thats it

i can use my sdr transceiver (homebrewed mchf) to receive drm 30 signals and route the raw iq data towards dream or sodira ... frequency setting via cat command (ft817 clone) ...

so ... for decoding drm transmissions you need:

an sdr frontend

an sdr software

a drm software

a virtual audio cable

.....

hope that helps you a bit

dg9bfc sigi

ps ... i also can use my funcube dongle to do that :-) ... or my icom765 with added 12 kc if output


Am 09.10.2017 um 09:05 schrieb Hans J Albertsson:

What is the easiest way to decode DRM30 or DRM+ with an airspy hf+

Hans J. Albertsson
From my Nexus 5

Den 9 okt. 2017 05:13 skrev "Eric Oyen" <eric.oyen@...>:
almost forgot,
there is also another project that takes the pan adaptor output from a few models of kenwood radios (TS-2000, TS-590 et al) and routes it to a braille display device (such as the braille sense U2) and depending on how strong the signal (and how wide), a certain number of dots gets activated. the stronger, the taller and as it gets wider, more cells are involved. 

on a 40 cell display, one could represent the entire 40 meter section and then use zoom functions to narrow down to whatever interesting signals are sensed.

this project is called JJRadio and is authored by a blind ham named Jim Schaefer.

anyway, thats some more info for the devs to chew on. :)

DE n7zzt Eric

On Oct 8, 2017, at 3:57 PM, Greg Ella wrote:

There is actually a field of research called sonification, which is the presentation of what would traditionally be visual data in an acoustic format.  This is not only for assisting blind people.  Sometimes, minor clues that would be missed visually become apparent in an acoustic format.  Even if the waterfall was not presented, just doing the panoramic display would be very useful.  It would use stereo to create the illusion of a physical space. The position and strength of peaks on the panoramic display would be portrayed by left/right balance, tone, phase and volume.  Several universities are doing research on this, but not specifically to SDR that I have seen yet.  There is a GNURadio project someone did recently involving the AM VHF aircraft band.  The entire voice portion of the band is demodulated and sent to headphones.  Transmissions at the low end of the band go to the left ear, transmissions in the middle go to both, and the high end of the band goes right.

Greg Ella
AD0JP

On Sun, Oct 8, 2017 at 2:42 PM, Joe M. <mch@...> wrote:
Not to pick nits, but...

525 to 1705 is 1180 kHz, so half would be 590 kHz.

(USA reference, as the OP is in the USA)

Joe M.


On 10/8/2017 11:28 AM, Eric Oyen wrote:
I personally chose 500 Khz as an arbitrary figure for a couple of reasons:
1. it is 1/2 the entire bandwidth of the Am Broadcast Band









Re: airspy HF + availability to public #airspyhfplus

Hans J Albertsson
 

What is the easiest way to decode DRM30 or DRM+ with an airspy hf+

Hans J. Albertsson
From my Nexus 5

Den 9 okt. 2017 05:13 skrev "Eric Oyen" <eric.oyen@...>:

almost forgot,
there is also another project that takes the pan adaptor output from a few models of kenwood radios (TS-2000, TS-590 et al) and routes it to a braille display device (such as the braille sense U2) and depending on how strong the signal (and how wide), a certain number of dots gets activated. the stronger, the taller and as it gets wider, more cells are involved. 

on a 40 cell display, one could represent the entire 40 meter section and then use zoom functions to narrow down to whatever interesting signals are sensed.

this project is called JJRadio and is authored by a blind ham named Jim Schaefer.

anyway, thats some more info for the devs to chew on. :)

DE n7zzt Eric

On Oct 8, 2017, at 3:57 PM, Greg Ella wrote:

There is actually a field of research called sonification, which is the presentation of what would traditionally be visual data in an acoustic format.  This is not only for assisting blind people.  Sometimes, minor clues that would be missed visually become apparent in an acoustic format.  Even if the waterfall was not presented, just doing the panoramic display would be very useful.  It would use stereo to create the illusion of a physical space. The position and strength of peaks on the panoramic display would be portrayed by left/right balance, tone, phase and volume.  Several universities are doing research on this, but not specifically to SDR that I have seen yet.  There is a GNURadio project someone did recently involving the AM VHF aircraft band.  The entire voice portion of the band is demodulated and sent to headphones.  Transmissions at the low end of the band go to the left ear, transmissions in the middle go to both, and the high end of the band goes right.

Greg Ella
AD0JP

On Sun, Oct 8, 2017 at 2:42 PM, Joe M. <mch@...> wrote:
Not to pick nits, but...

525 to 1705 is 1180 kHz, so half would be 590 kHz.

(USA reference, as the OP is in the USA)

Joe M.


On 10/8/2017 11:28 AM, Eric Oyen wrote:
I personally chose 500 Khz as an arbitrary figure for a couple of reasons:
1. it is 1/2 the entire bandwidth of the Am Broadcast Band








Re: Can you try my server?

pd0rtl
 

Ah, AM 19Khz ,SSB 9.765Khz, need to try it with DRM ^^
THnxsk

On 7-10-2017 11:00, prog wrote:
This has been explained many times in this same thread.

https://airspy.groups.io/g/main/message/23907


Re: airspy HF + availability to public #airspyhfplus

Eric Oyen <eric.oyen@...>
 

almost forgot,
there is also another project that takes the pan adaptor output from a few models of kenwood radios (TS-2000, TS-590 et al) and routes it to a braille display device (such as the braille sense U2) and depending on how strong the signal (and how wide), a certain number of dots gets activated. the stronger, the taller and as it gets wider, more cells are involved. 

on a 40 cell display, one could represent the entire 40 meter section and then use zoom functions to narrow down to whatever interesting signals are sensed.

this project is called JJRadio and is authored by a blind ham named Jim Schaefer.

anyway, thats some more info for the devs to chew on. :)

DE n7zzt Eric

On Oct 8, 2017, at 3:57 PM, Greg Ella wrote:

There is actually a field of research called sonification, which is the presentation of what would traditionally be visual data in an acoustic format.  This is not only for assisting blind people.  Sometimes, minor clues that would be missed visually become apparent in an acoustic format.  Even if the waterfall was not presented, just doing the panoramic display would be very useful.  It would use stereo to create the illusion of a physical space. The position and strength of peaks on the panoramic display would be portrayed by left/right balance, tone, phase and volume.  Several universities are doing research on this, but not specifically to SDR that I have seen yet.  There is a GNURadio project someone did recently involving the AM VHF aircraft band.  The entire voice portion of the band is demodulated and sent to headphones.  Transmissions at the low end of the band go to the left ear, transmissions in the middle go to both, and the high end of the band goes right.

Greg Ella
AD0JP

On Sun, Oct 8, 2017 at 2:42 PM, Joe M. <mch@...> wrote:
Not to pick nits, but...

525 to 1705 is 1180 kHz, so half would be 590 kHz.

(USA reference, as the OP is in the USA)

Joe M.


On 10/8/2017 11:28 AM, Eric Oyen wrote:
I personally chose 500 Khz as an arbitrary figure for a couple of reasons:
1. it is 1/2 the entire bandwidth of the Am Broadcast Band







Re: airspy HF + availability to public #airspyhfplus

Eric Oyen <eric.oyen@...>
 

that is something I am interested in. 

also, there is another project called seeing with sound (www.seeingwithsound.com) that takes a live scene and converts it to a soundscape (in stereo) with pitch being vertical represented and scanned from left to right. the brighter the object, the louder it will be.  in its way, its a 3d soundscape. I wonder if the algorithm can be adapted to serve as an audio pan adaptor? I might have to drop peter meir a line on his list to find out.

DE n7zzt Eric

On Oct 8, 2017, at 3:57 PM, Greg Ella wrote:

There is actually a field of research called sonification, which is the presentation of what would traditionally be visual data in an acoustic format.  This is not only for assisting blind people.  Sometimes, minor clues that would be missed visually become apparent in an acoustic format.  Even if the waterfall was not presented, just doing the panoramic display would be very useful.  It would use stereo to create the illusion of a physical space. The position and strength of peaks on the panoramic display would be portrayed by left/right balance, tone, phase and volume.  Several universities are doing research on this, but not specifically to SDR that I have seen yet.  There is a GNURadio project someone did recently involving the AM VHF aircraft band.  The entire voice portion of the band is demodulated and sent to headphones.  Transmissions at the low end of the band go to the left ear, transmissions in the middle go to both, and the high end of the band goes right.

Greg Ella
AD0JP

On Sun, Oct 8, 2017 at 2:42 PM, Joe M. <mch@...> wrote:
Not to pick nits, but...

525 to 1705 is 1180 kHz, so half would be 590 kHz.

(USA reference, as the OP is in the USA)

Joe M.


On 10/8/2017 11:28 AM, Eric Oyen wrote:
I personally chose 500 Khz as an arbitrary figure for a couple of reasons:
1. it is 1/2 the entire bandwidth of the Am Broadcast Band







Re: Can you try my server?

Jeff Kelly
 

27%

Jeff



Sent from my iPad

On Oct 8, 2017, at 5:59 PM, prog <info@...> wrote:

Can you report the CPU usage with htop?


Re: airspy HF + availability to public #airspyhfplus

Greg Ella
 

There is actually a field of research called sonification, which is the presentation of what would traditionally be visual data in an acoustic format.  This is not only for assisting blind people.  Sometimes, minor clues that would be missed visually become apparent in an acoustic format.  Even if the waterfall was not presented, just doing the panoramic display would be very useful.  It would use stereo to create the illusion of a physical space. The position and strength of peaks on the panoramic display would be portrayed by left/right balance, tone, phase and volume.  Several universities are doing research on this, but not specifically to SDR that I have seen yet.  There is a GNURadio project someone did recently involving the AM VHF aircraft band.  The entire voice portion of the band is demodulated and sent to headphones.  Transmissions at the low end of the band go to the left ear, transmissions in the middle go to both, and the high end of the band goes right.

Greg Ella
AD0JP

On Sun, Oct 8, 2017 at 2:42 PM, Joe M. <mch@...> wrote:
Not to pick nits, but...

525 to 1705 is 1180 kHz, so half would be 590 kHz.

(USA reference, as the OP is in the USA)

Joe M.


On 10/8/2017 11:28 AM, Eric Oyen wrote:
I personally chose 500 Khz as an arbitrary figure for a couple of reasons:
1. it is 1/2 the entire bandwidth of the Am Broadcast Band






Re: Can you try my server?

prog
 

Can you report the CPU usage with htop?

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