Date   

Re: Predistortion

Klaus DK7XL
 

Ed,

you are right - I am missing indicators as well - especially feedback level - this is a must have. However - predistortion is at least working like I have outlined previously. Try ist yourself and change feedback level even up to +/- 20dB and you will notice at the 3-layer spectrum display how output IMD (blue graph) is varying according to feedback level variance.

Let us monitor what Simon will further do here and enjoy his splendid work.

73 - Klaus, DK7XL


Re: SDR Receiver Recommendations

John, G4DRS <g4drs@...>
 

This is an interesting topic to me, as an old dinosaur.
I have a Yaesu transceiver with an SDR tuned to the 9MHz IF plugged into the IF out terminal, used as a panadaptor. It works really well.
However, It's my only experience of an SDR, so I don't know whether it works really well compared to the previous panadaptor I had (i.e. nothing), or whether it works really well in an absolute frame of reference.
I know (I think) roughly what makes a good superhet, after 45 years of absorbing knowledge by osmosis, even if I am not great at articulating it. I know little or nothing about what makes the difference between a good SDR and a bad one.
I do have an RTL8532(is that the right number?) dongle, but I have hardly even plugged it in. 
My guess is that the RTL probably qualifies as a really bad SDR, but I don't know for sure. Indeed, if it does, I have no idea what makes it so compared to my other one (a Radiokits Hunter), or even where the Hunter sits in the hierarchy of SDR quality.
According to Mr. Sherwood, my old FTdx5000 still ranks pretty high in the receiver performance lists, but I don't see RSP1A, etc. in the list, so I'm none the wiser.

Is there an easy way to explain it all to a humble mechanical engineer like myself?


John
G4DRS


Lime SDR and PTT out #poll

 

HI,

I am new to this group.

I have tried a lime sdr (usb 3) with sdr console and it works.
A small amp with a 2n 5109 gives me 3 watt output.
But it does not have a ptt out so I have to switch manualy from rx to tx the antennab relais.

In openhpsdr  ( I use that with an Anan 200d and a redpitaya) there is a CAT possibility for PTT.
a simple usb to serial port cable gives switching dsr to - 9 and + nine volts. 
My question to Simon is now is it possible to implement that in SDRconsole v3.

Thanks for answering in advance.

Onno  (callsign PA0ONO)


Results

See Who Responded


Re: SDR Receiver Recommendations

Italo Crivellotto
 

Senza indugi ;  Elad FDM-S2,    oppure RX DUO ..oppure la pietra miliare del SDR :  il Perseus .
Tutti e 3 (+ SdrPlay) funzionano benissimo con Sdr Console 
73
De IK3UMZ


Re: #RTL SDR dongle runing in Direct Sampling mode #rtl

Bernard Wehrli
 

Hello All 

I finally managed that SDR Console works in direct sampling Mode with my Realtek RTL 2838UHIDIR stick. 
I followed strictly the instruciotns given in the Link:
http://www.rtl-sdr.com/new-rtl-sdr-drivers-and-extio-available-bias-tee-support-and-direct-sampling-for-sdr-console/
… and it finally worked. However there are some tricky things to be aware of. Here some additional info how I made it to work in my case:

1: Download the files according to the instructions in the link above.
2: In order to identify the USB stick, you HAVE TO start the program " RtlSdr Catalog.exe" prior to start the SDR Console.This program is part of the files you are told in above link  to copy from the downloade site into the folder where the SDR Console program is stored.
3. Start SDR Console, go to the "Home" tab and klick on "Select Radio".  A new window opens.
4: Klick on "Definitions"  and then klick on "Search". Here you should find now  "RTL SDR (FULL)". Select it and add it to the Radio Definition table.
5:. Select the newly loaded RTL Radio Definition. On the right side of the table you find the DLL info " RTL SDR (FULL) " again.
6: Klick "Save" . You will be back on the window  "Select Radio".
7: Select again the newly installed RTL Dongle and klick on "Start".  By now, the SDR Console should show at least a noise floor.
8: Then go to the "Home" tab of the SDR Console program and select "Radio Configuration"
9: A window called " RTL SDR (Full)" should opens. Select " Set Tuner Modes".
10: In the field " Direct Sampling" on the upper right you can now select "Q-Channel"

It might be that next time, when you restart your Computer again, that SDR Console doesn't find the RTL stick anymore. In such a case start the program " RtlSdrCatalog.exe" again before you start the SDR Console. 
If that happens regularly, it would be usefull to make a short Batch program to start the two programs in the right sequence automatically.

I hope this guide is helpfull for any other user of RTL sicks which are able to operate in the direct sampling mode. 

73 de Bernard, HB9ALH


Re: SDR Receiver Recommendations

Mark Cayton <mcayton@...>
 

I have the RSP1, RSP2 and RSP1A (I just sold the RSP1 two weeks ago).  With an adequate pre-filter on the input I can detect very little difference in performance between any of those radios. I get awesome performance receiving HF on the RSP2, feeding my 80/40 fan dipole into the hi-Z input thru a Nooelec 1:9 Tiny Balun installed backwards:

https://drive.google.com/file/d/0B77dlHbMDWmJU2NlOG12c1RIb1k/view?usp=sharing

https://drive.google.com/file/d/0B77dlHbMDWmJYXc2LUgxa3VGN2VmSkdzZXdCZ014ZGt2LURr/view?usp=sharing

And the RSP1A performs admirably on BCAM even when dealing with very strong signals:

https://drive.google.com/file/d/1Y6uTghDkdUIA1hEnc2CZpwUjA1FapnNr/view?usp=sharing

Carry on,

Mark  K1LSB


Re: Predistortion

Edward Clark <edclarkiv1@...>
 

I get zero indications that predistortion is working. There are no controls or indicators pertaining to predistortion.

I’m guessing it just hasn’t been gotten to yet.

Thanks,
Ed

Sent from my iPhone, apologies for any missed auto corrections and typos!


Re: SDR Receiver Recommendations

Jon Hudson
 

Thanks Ray..  no worries- you were clear... it’s just we know that the RSP1A shouldn’t be behaving worse and we’d like to understand what’s happening.   

Best 73, Jon


On 12 Feb 2019, at 10:11, Ray Lyford <ancient_brit@...> wrote:

Jon 
        OK I will do that for you. It's not a deal killer and I hope I made that very clear.

Ray

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jon Hudson <jon.hudson@...>
Sent: 12 February 2019 09:23
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] SDR Receiver Recommendations
 
Ray.  It would be good if you could open up a support ticket on www.sdrplay.com/support explaining your set-up and showing comparisons because this is not something that we would expect.

Many thanks, Jon 


On 12 Feb 2019, at 08:20, Ray Lyford <ancient_brit@...> wrote:

It's too easy to keep buying new gear and often we just don't need it because it not better than what we have already. 

I have had the SDRplay RSP for good time now. It's a great little SDR and a good price. I like to watch the LF and VLF bands. The RSP can do it but it's not made for that band.
SDRPlay  Announced the RSP1a it has LF VLF. I bought one. It's on my shelf and it's is also a good cheap SDR. It's on the shelf because the earlier RSP performs much better for me on LF and VLF.  Lesson learnt.  Was I robbed, no because it's still a good SDR.

Want an example of better. The older SDR receives and decodes the Pinneberg RTTY weather on 147Khz. My newer RSP1a struggles to see the station let alone being able to decode the audio from it. The first question should be will it do something I need that my old radio cannot do. If the answer is no go by some flowers for your wife and tell her you bought her flowers instead.












 




From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jon Hudson <jon.hudson@...>
Sent: 11 February 2019 22:24
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] SDR Receiver Recommendations
 
The RSP2pro has multiple antenna ports and external clock in and out, plus is housed in a rugged steel case.  But for single antenna use the RSP1A compares very well at a significantly lower price.


On 11 Feb 2019, at 17:11, Bo Barry <bobarr@...> wrote:

So why is it better than the RSP2 PRO that I'm enjoying so much? 
Older is better! Got it! Wishing I still had my '54 Chevy!
--
Bo W4GHV since '54


Re: Interference

Dennis Fitch
 

Thanks for that Graham, I did actually try that a while ago, interference was still present, My next door neighbour leaves his HP printer on 24/7, I'm wondering if that could be the culprit.

--
Dennis  G8IMN


Re: Predistortion

Klaus DK7XL
 

Thanks, David!

So far I can detect  that predistortion is working because increasing/decreasing feedback level does have an effect on IMD.

73 - Klaus


Re: SDR Receiver Recommendations

Ray Lyford
 

Jon 
        OK I will do that for you. It's not a deal killer and I hope I made that very clear.

Ray

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jon Hudson <jon.hudson@...>
Sent: 12 February 2019 09:23
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] SDR Receiver Recommendations
 
Ray.  It would be good if you could open up a support ticket on www.sdrplay.com/support explaining your set-up and showing comparisons because this is not something that we would expect.

Many thanks, Jon 


On 12 Feb 2019, at 08:20, Ray Lyford <ancient_brit@...> wrote:

It's too easy to keep buying new gear and often we just don't need it because it not better than what we have already. 

I have had the SDRplay RSP for good time now. It's a great little SDR and a good price. I like to watch the LF and VLF bands. The RSP can do it but it's not made for that band.
SDRPlay  Announced the RSP1a it has LF VLF. I bought one. It's on my shelf and it's is also a good cheap SDR. It's on the shelf because the earlier RSP performs much better for me on LF and VLF.  Lesson learnt.  Was I robbed, no because it's still a good SDR.

Want an example of better. The older SDR receives and decodes the Pinneberg RTTY weather on 147Khz. My newer RSP1a struggles to see the station let alone being able to decode the audio from it. The first question should be will it do something I need that my old radio cannot do. If the answer is no go by some flowers for your wife and tell her you bought her flowers instead.












 




From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jon Hudson <jon.hudson@...>
Sent: 11 February 2019 22:24
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] SDR Receiver Recommendations
 
The RSP2pro has multiple antenna ports and external clock in and out, plus is housed in a rugged steel case.  But for single antenna use the RSP1A compares very well at a significantly lower price.


On 11 Feb 2019, at 17:11, Bo Barry <bobarr@...> wrote:

So why is it better than the RSP2 PRO that I'm enjoying so much? 
Older is better! Got it! Wishing I still had my '54 Chevy!
--
Bo W4GHV since '54


Re: Predistortion

David J Taylor
 

I might have missed something as a newbie to this group - but are there any recent posts re. predistotion with HERMES and alike?
Thanks - Klaus, DK7XL
=======================================

Klaus,

Charles Brain (G4GUO) was looking at this - possibly in connection with DATV. Look for him on Twitter, and some of his blog entries are here:

http://g4guo.blogspot.com/search?q=distortion

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: SDR Receiver Recommendations

Jon Hudson
 

Ray.  It would be good if you could open up a support ticket on www.sdrplay.com/support explaining your set-up and showing comparisons because this is not something that we would expect.

Many thanks, Jon 


On 12 Feb 2019, at 08:20, Ray Lyford <ancient_brit@...> wrote:

It's too easy to keep buying new gear and often we just don't need it because it not better than what we have already. 

I have had the SDRplay RSP for good time now. It's a great little SDR and a good price. I like to watch the LF and VLF bands. The RSP can do it but it's not made for that band.
SDRPlay  Announced the RSP1a it has LF VLF. I bought one. It's on my shelf and it's is also a good cheap SDR. It's on the shelf because the earlier RSP performs much better for me on LF and VLF.  Lesson learnt.  Was I robbed, no because it's still a good SDR.

Want an example of better. The older SDR receives and decodes the Pinneberg RTTY weather on 147Khz. My newer RSP1a struggles to see the station let alone being able to decode the audio from it. The first question should be will it do something I need that my old radio cannot do. If the answer is no go by some flowers for your wife and tell her you bought her flowers instead.












 




From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jon Hudson <jon.hudson@...>
Sent: 11 February 2019 22:24
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] SDR Receiver Recommendations
 
The RSP2pro has multiple antenna ports and external clock in and out, plus is housed in a rugged steel case.  But for single antenna use the RSP1A compares very well at a significantly lower price.


On 11 Feb 2019, at 17:11, Bo Barry <bobarr@...> wrote:

So why is it better than the RSP2 PRO that I'm enjoying so much? 
Older is better! Got it! Wishing I still had my '54 Chevy!
--
Bo W4GHV since '54


Re: EER

Klaus DK7XL
 

Envelope Elimination and Restauration (EER) - digital PWM-output at J14 (as with PowerSDR) may also be used for Envelope Tracking (ET) power amplifier concepts.


Re: Interference (how to approach interference hunting)

Ray Lyford
 

Thanks for posting the link Dave. That's very interesting. 

Ray


From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Dave Cole <dave@...>
Sent: 11 February 2019 18:17
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Interference (how to approach interference hunting)
 
Here is a link to a two part blog I put together dealing with up to use
an SDR to characterize your RFI environment.

https://www.nk7z.net/sdr-rfi-survey-p1/

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
Award Manager, 30MDG Grid Awards
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 2/11/19 9:27 AM, bill K7WXW wrote:
> If you are going to embark on a RFI noise hunting project, here are a
> couple of hard-earned lessons I will share:
>
> Characterize your SDR, software, and related equipment (laptop, power
> adapter, USB cable) without an antenna, across the bands of interest. Do
> this for each antenna port. Make screen captures. Keep constant, and
> make note of, your software application settings.
>
>
> Why? Your SDR and laptop will create artifacts, noise, and ghost signals
> due to internal clock signals, power supply noise (even on a battery)
> and interactions between the software and SDR hardware. If you don't
> know what and where these are, you will end up chasing noise sources
> that are in your test equipment.
>
> Install BCB and FM band stop filters.
>
> Why? SDR front ends are incredibly easy to overload and when they do,
> they will create images of signals up and down the bands. My RSP2 had
> commercial FM station images down to 2Mhz and BCB staion images well
> into 24MHz.
>
> Turn down the RF gain and turn off the LNA.
>
> Why? Overload, again. For the most part, any noise signal that needs a
> lot of RF gain or an LNA isn't a signal you will be worried about.
>
> Capture noise data two ways: using your every day antenna and a short
> telescopic antenna, especially at lower bands.
>
> Why? This gives you a way to see which noise sources are more likely to
> be outside your house. It will also show you which signals are likely to
> be the most important to find and fix as a signal that shows up on the
> small, inefficient telescopic whip along with your everyday antenna is
> likely to be quite powerful.
>
> Run a full range of captures over all of the bands of interest, using
> your everyday antenna, and a consistent set of SDR software/hardware
> settings (the ones you used to capture the no-antenna images) at several
> points in the day.
>
> Why? Noise signals are rarely there "all the time".  Keeping the same
> settings for this step lets you visually compare your no antenna screen
> captures with this set and eliminate signals that are likely artifacts
> of your SDR system.
>
> Finally, consider setting up the SDR software to capture really
> bothersome signals over a period of a day or so.
>
> Why? The patterns of appearance and disappearance holds valuable
> information for identifying signal sources like solar power systems,
> grow lights, and plasma TVs.
>
> Like I said, all hard learned lessons. I made, and continue to make,
> every mistake possible!  73 Bill K7WXW
>
>
>
>
>
>
>




Re: Ettus No Tx functionality. #ettusb210 #uhd #sdrconsolev3

Terry_G0EZY
 

Also looking forward to the Tx capability for an N210 + UBX40. The Rx works well in SDR-Radio, although it would benefit from an option to enable the external 10 MHz reference - the internal reference locking tends to jump 10s of Hz which is annoying.

For Tx/Rx have a look at SoDaRadio: https://kb1vc.github.io/SoDaRadio/  this works well for my system and will provides multimode Tx/Rx up to 6 GHz. it also enables the 10 MHz external reference which overcomes the frequency jumps I get in SDR-Radio. The N200 and B200 platforms are supported.

The Ubuntu-Linux installation wasn't too painful even for a Linux novice like me. KB1VC has put a lot of effort into simplifying the installation procedures.

73 Terry G0EZY


Re: SDR Receiver Recommendations

Ray Lyford
 

It's too easy to keep buying new gear and often we just don't need it because it not better than what we have already. 

I have had the SDRplay RSP for good time now. It's a great little SDR and a good price. I like to watch the LF and VLF bands. The RSP can do it but it's not made for that band.
SDRPlay  Announced the RSP1a it has LF VLF. I bought one. It's on my shelf and it's is also a good cheap SDR. It's on the shelf because the earlier RSP performs much better for me on LF and VLF.  Lesson learnt.  Was I robbed, no because it's still a good SDR.

Want an example of better. The older SDR receives and decodes the Pinneberg RTTY weather on 147Khz. My newer RSP1a struggles to see the station let alone being able to decode the audio from it. The first question should be will it do something I need that my old radio cannot do. If the answer is no go by some flowers for your wife and tell her you bought her flowers instead.












 




From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jon Hudson <jon.hudson@...>
Sent: 11 February 2019 22:24
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] SDR Receiver Recommendations
 
The RSP2pro has multiple antenna ports and external clock in and out, plus is housed in a rugged steel case.  But for single antenna use the RSP1A compares very well at a significantly lower price.


On 11 Feb 2019, at 17:11, Bo Barry <bobarr@...> wrote:

So why is it better than the RSP2 PRO that I'm enjoying so much? 
Older is better! Got it! Wishing I still had my '54 Chevy!
--
Bo W4GHV since '54


Re: ANAN Radios 7 receiver capability

Simon Brown
 

Carl,

Not yet - haven't had time.

Simon Brown, G4ELI
www.sdr-radio.com

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Carl Moreschi
Sent: 11 February 2019 21:43
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] ANAN Radios 7 receiver capability

Hi Simon,

Did you ever implement the 7 receiver capability of the ANAN radios?

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com


Re: EER

Simon Brown
 

Que?

 

Simon Brown, G4ELI
www.sdr-radio.com

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Klaus Lohmann
Sent: 11 February 2019 15:03
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] EER

 

Does anyone have some experience with EER or ET on a HERMES board with SDR Console?
Klaus, DK7XL


Re: 3.0.5 Available

Lakshman Bijanki
 

Hi Simon,

Thanks a lot for 3.0.5.

Is it possible to include the RX name on the Satellite tracking screen?
I run two instances of SDR-Console on two receivers to track two different satellites.
Something like this below?


This would help when switching satellite tracking screens.
Perhaps, you could dispense with the satellite name up there as the satellite name appears on the map anyway.

Thanks & 73 de Lucky / VU2LBW