Date   

HF Antenna Query

JamesF_UK
 

Hi All,

Another newbie question.... I currently have an MLA30 mounted in a window away from as much interference as possible. I can't place it in an ideal location outside as I live in a pretty restricted environment!

Do you think I would benefit from investing in a pre-assembled PA0RDT or am I likely to get similar results, i.e. would it make much difference?

Thanks,
James


Re: SDR Recommendation

JamesF_UK
 

Hi All.... your advice is much appreciated - I'll have a think about it but feel that putting some pennies away and investing in the Elad might be my best bet.

Thankfully I'm in a relatively low signal area for local/national stations and can often get some interesting tropo/spE "hits".

Cheers,
James


Re: SDR Recommendation

Tracey Gardner
 

 
Hello James
 
Well to be honest if you're contemplating looking at 20MHz or so of bandwidth then you really need to be looking at multiple monitors?
And you'll most probably need a secondhand i5 or i7 to run three or more SDRs.
 
I would also support Jim's comment with regards to the signal levels that you could experience in Band 2.
I wonder if a number of  Airspys would fare any better than the SDRPlay in your location?
Three R2's can be had for about £400 (direct from Itead) and could be bought in stages, so spreading your outlay.
Or four Airspy Minis would again cost you about £300 and should give you around 24MHz of bandwidth
Food for thought?
 
73s Tracey G5VU
 
 

----- Original Message -----
From: jfurness via groups.io <jfurness@...>
Reply-To: <main@SDR-Radio.groups.io>
To: <main@SDR-Radio.groups.io>
Sent: 13/07/2020 15:00:27
Subject: Re: [SDR-Radio] SDR Recommendation

Hi Tracey,

Interesting suggestion!!! This is why I'm obviously a newbie.... How would that translate to software? Multiple instances of SDRC or combine the 3 in one instance of the software?

I'm a bit limited CPU-wise as I'm running the RSP1A (very successfully atm) in a virtual Windows 10 machine on an iMac!

Thanks,
James


Re: SDR Recommendation

Jim Smith G0OFE
 

It depends partly on the location, and how near/strong your local TXs are.

If you go to FMList, enter your location on there and see how strong your locals are, you might get an idea.

Here, there is no way I could use SDRPlays of any flavour for DX work on Band 2, because nearby TXs cause too much overload, generating spurii all over the place. I have Rowridge 39km away line of sight running five 250kw TXs. FMList gives signal strengths of the order of 70db. (not sure what the reference is but it does give an idea)

If your locals are 60db or less then you might stand a chance.

Using a reasonable antenna pointing east towards Rowridge causes my SDRPlay's toes to curl up.

Of various SDRs I've used over the years, only the Airspy HF+ and the Elad S2 have not had overload issues. I would think the S3 (when it eventually appears) should be similarly bombproof.

My £0.02.

================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF


On 13/07/2020 13:52, Tracey Gardner via groups.io wrote:
 
Hello James
 
Why not save your pennies and run multiple SDRPlays?
Three of them should comfortably give you 24MHz of bandwidth.
And I'm guessing that they would cost you less than a third of the price of an Elad S3?
 
73s Tracey G5VU
 
 
----- Original Message -----
From: jfurness via groups.io <jfurness@...>
Reply-To: <main@SDR-Radio.groups.io>
To: <main@SDR-Radio.groups.io>
Sent: 13/07/2020 14:15:22
Subject: Re: [SDR-Radio] SDR Recommendation

Hi Simon,

Thanks for the recommendation... that's going to be quite big budget for me, is there anything middle ground or should I just be patient and save up my pennies??!

Thanks,
James


Re: DIY Arduino Midi Controller for SDRC completed

DL2EBV
 

Hello Andrea,
thank you very much for your work.

I am also trying to make a controler for some SDR-programms (SDR console, ELAD SW2, HRD,...). First I tried an old mouse with an external encoder instead of the mouse wheel. Works easy.
Later I tried the same mouse-interface with an Arduiono Leonardo. Problem is that when using the mouse-interface the focus has to be on die waterfall etc.
Then I tried the keyboard-interface, works better as the focus is free. You can use any definition of shortcuts used by the programms.
Could be managed for different programms by using tables of the shortcuts and selecting at start-up of the controler.

Today I tried your midi-program. I saw the same problem as with the keyboard-interface:
Using a high resolution encoder is OK when turning slow but pulses are lost when turning fast.

At the moment I use a 600-step optical encoder for experiments.
After my short experiments I think that the keyboard-interface is even faster.
I will try also an Arduino Zero which has a better clock rate; maybe it can handle the pulses faster.
I will also try with a 100-step encoder, maybe this will work.
But for real tuning-feeling more steps per revolution will be better...

Keep trying...

Greetings, Ernst, DL2EBV


Re: SDR Recommendation

Simon Brown
 

Tracey,

 

Dynamic range could be an issue – when the Tropo is strong I see at least 100dB SNR at times so a good 16-bit SDR is needed, 18-bit would be better. Anyway, I do know something which I can’t make public, so waiting a while and using the SDRplay may be the better option.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Tracey Gardner via groups.io
Sent: 13 July 2020 14:53
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Recommendation

 

 

Hello James

 

Why not save your pennies and run multiple SDRPlays?

Three of them should comfortably give you 24MHz of bandwidth.

And I'm guessing that they would cost you less than a third of the price of an Elad S3?

 

73s Tracey G5VU

 

 

----- Original Message -----

From: jfurness via groups.io <jfurness@...>

Sent: 13/07/2020 14:15:22

Subject: Re: [SDR-Radio] SDR Recommendation


Hi Simon,

Thanks for the recommendation... that's going to be quite big budget for me, is there anything middle ground or should I just be patient and save up my pennies??!

Thanks,
James


Re: I cannot get External Radio on Satellite screen to work. #satellites #ic-9700

Simon Brown
 

Hi,

 

Been a busy weekend. What should happen is that you tune the external radio by hand, then the Sat Track takes over and applies doppler. Nothing in common with the External radio in the main screen I think.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kees van Engelen
Sent: 13 July 2020 11:23
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] I cannot get External Radio on Satellite screen to work. #satellites #ic-9700

 

Anyone has an idea, please?
It's driving me bunkers .....
--
73
Kees
PA3KVE


Re: SDR Recommendation

JamesF_UK
 

Hi Tracey,

Interesting suggestion!!! This is why I'm obviously a newbie.... How would that translate to software? Multiple instances of SDRC or combine the 3 in one instance of the software?

I'm a bit limited CPU-wise as I'm running the RSP1A (very successfully atm) in a virtual Windows 10 machine on an iMac!

Thanks,
James


Re: SDR Recommendation

Tracey Gardner
 

 
Hello James
 
Why not save your pennies and run multiple SDRPlays?
Three of them should comfortably give you 24MHz of bandwidth.
And I'm guessing that they would cost you less than a third of the price of an Elad S3?
 
73s Tracey G5VU
 
 

----- Original Message -----
From: jfurness via groups.io <jfurness@...>
Reply-To: <main@SDR-Radio.groups.io>
To: <main@SDR-Radio.groups.io>
Sent: 13/07/2020 14:15:22
Subject: Re: [SDR-Radio] SDR Recommendation

Hi Simon,

Thanks for the recommendation... that's going to be quite big budget for me, is there anything middle ground or should I just be patient and save up my pennies??!

Thanks,
James
_._,_._,_


Re: SDR Recommendation

JamesF_UK
 

Hi Simon,

Thanks for the recommendation... that's going to be quite big budget for me, is there anything middle ground or should I just be patient and save up my pennies??!

Thanks,
James


Re: I cannot get External Radio on Satellite screen to work. #satellites #ic-9700

Kees van Engelen
 

Anyone has an idea, please?
It's driving me bunkers .....
--
73
Kees
PA3KVE


Re: Ettus compatibility #sdrconsolev3 #ettus

Larry Dodd
 

Yes. The advantage of ethernet over USB is faster speed and wider bandwidth. But the cost is higher also. 
Larry

On Jul 12, 2020, at 2:20 PM, ray roberge via groups.io <rayroberge@...> wrote:



N210 is Ethernet.

Ray


Sent from my phone.


Re: Rotator for a Wellbrook antenna

jdow
 

Yes - the canonical Armstrong device.

{^_-}

On 20200712 11:55:43, Alan Lever wrote:
I'm wondering now whether a cable system similar to those used on a 22 rifle range might work.
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
From: billcoombes <bill@allgraphics.co.uk>
Date: 12/07/2020 16:58 (GMT+00:00)
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Rotator for a Wellbrook antenna
Hello Alan,
You only need to rotate it through 90 degrees and might be able to make something with a small D.C. motor etc. I can send you some details of motors etc if it will help.
Bill - Sunny Bournemouth


Re: Rotator for a Wellbrook antenna

jdow
 

Look up "Armstrong Rotator". I bet it will still produce interesting results. It refers to using the hams nice strong arms to provide the rotational energy, usually remotely using ropes. The ham's arms can be replaced by a suitable servo motor, of course.

{^_-}

On 20200712 10:58:38, Jim Smith G0OFE wrote:
Yes, I have found that, too, now I can rotate mine.
Jim, also sunny sunny Bournemouth.
*================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF*
On 12/07/2020 16:35, Mike Bott wrote:
Actually, I believe 180° would be necessary to be null out any local noise source

--
Mike

On Sun, Jul 12, 2020, 11:58 billcoombes <bill@allgraphics.co.uk <mailto:bill@allgraphics.co.uk>> wrote:

Hello Alan,
You only need to rotate it through 90 degrees and might be able to make
something with a small D.C. motor etc. I can send you some details of
motors etc if it will help.
Bill - Sunny Bournemouth


Re: DIY Arduino Midi Controller for SDRC completed

jdow
 

I was thinking along that TS2000 concept or ideally some concise similar set of messages that get translated. Of course, MIDI in to MIDI out is also easy enough. Your buttons would send what it sends, with both press and release messages for buttons. Then buttons and button combinations can change functions of other buttons or rotary encoders. Rotary encoders are tricky to handle properly, too. Ideally they'd send a MIDI note with the velocity set as turning rate. As long as turn pulses per ms is non-zero it sends the MIDI note and then it sends one more with a velocity of zero before stopping sending anything - something like what mice theoretically do.

The real puzzle is defining what a mechanical interface for SDRC ought to do. A virtual MIDI device concept allows moving the translation up into the PC where it is easier to work with.

{^_^}

On 20200712 12:02:33, Andrea Dalbagno wrote:
Hello Joanne
Yes, the controller is speaking to PC in MIDI over USB "language", that is native for ARDUINO MICRO and some other Arduino flavors.  As far as I know there is also the possibility to code a sketch to dialogue over the serial port, or at least to use serial protocol over a serial to usb soft/hardware "black box"(Did you mean to simulate TS2000 Kenwood protocol and connect arduino to SDRC as a CAT ?)
Unfortunately I don't have the knowledge to manage things like WinUSB.sys: my modest controller and his coding are the result of many hours of try and try again :0)
Thanks for your appreciation.
...I could assemble and drill a wooden box for you, if you need ;^)
Best regards
Andrea
Il dom 12 lug 2020, 07:45 jdow <jdow@earthlink.net <mailto:jdow@earthlink.net>> ha scritto:
I "presume" (perhaps rashly {^_-}) that this speaks to the PC as MIDI over USB,
right? Can it be setup to work on some other basis such as serial port? (In
principle it could be setup as a WinUSB.sys device with ZADIG and allow it
to do
almost anything - including accept display feedback if it grows a small
display.) Something that comes to mind is DMX512 if the serial port can be
programmed to a high enough data rate.
A useful button function would be modify the functions of the rotary
encoders to
"seldom used" functions which might include RX selection, although the dummy
rotary encoder might be best for that.
This might be a much nicer control tool than trying to bend mixer or lighting
decks to do the job. And I suspect the Arduino board used is a minor portion of
the project's expense.
(And *I* am not going to try to build and drill the box. When I try to work
with
that kind of tool +/- 1/4" is about the accuracy level I manage. Nobody taught
me how to use that kind of tool as a child. So am clumsy beyond belief.)
That is an exciting looking project.
{^_-}
On 20200711 08:26:21, Andrea Dalbagno wrote:
> Hello Gentlemen
>
> Attached, you'll find (I hope :-) ) some documents on how I made a DIY MIDI
> Controller for SDRC, based on Arduino MICRO.
> I wish to say a big Thanks to Chris here, who gave many useful infos and
a solid
> starting point.
> So, the "thing" can do some things (SWL oriented, for now: HAM exams on
the way):
> - VFO (4 tuning step);
> - VFO step change;
> - 1 MHz UP and 1 MHz DOWN
> - MODE change;
> - Filter Lower Limit increase-decrease;
> - Filter Higher Limit increase-decrease;
> - Filter Limits increase-decrease step (2 step)
> - Volume;
> - DUMMY Buttons and Encoder for experimens;
> - Spare buttons for future expansions;
>
> The Arduino sketch is conveniently commented and you will find also a
wiring scheme.
> You can change all you want, in the way you want.
>
> It would be great if Simon would ad a MIDI command to Zoom IN and Zoom
OUT the
> waterfall: I tried to emulate the mouse wheel with Arduino, but it seems not
> possible when using the MIDI library. But may be I'm not so clever to get it
> working.
>
> 73
> Andrea SWL I 1360-TN
>
> Attachments:
>
>   * DLB MIDI V_3_bb.pdf
<https://SDR-Radio.groups.io/g/main/attachment/58364/0>
>   * DLB MIDI V_3_BOM.doc
<https://SDR-Radio.groups.io/g/main/attachment/58364/1>
>   * MIDI_DLB_3.ino <https://SDR-Radio.groups.io/g/main/attachment/58364/2>
>   * MIDI_DLB_3.jpg <https://SDR-Radio.groups.io/g/main/attachment/58364/3>
>
>


Re: DIY Arduino Midi Controller for SDRC completed

jdow
 

Well, as I noted it uses a UART. At that point it becomes something unusual in the serial world. It becomes an optically isolated current loop that has worked reliably over at least 1/2 km distances. Real MIDI hardware physical layer is something special. Musicians HATE hum and ground loops.

{^_-}

On 20200712 09:23:03, Simon Brown wrote:
MIDI still uses a serial port protocol, but one which is highly efficient.
Simon Brown, G4ELI
https://www.sdr-radio.com
*From:*main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> *On Behalf Of *Radioman ZeroZero
*Sent:* 12 July 2020 17:18
*To:* main@SDR-Radio.groups.io
*Subject:* Re: [SDR-Radio] DIY Arduino Midi Controller for SDRC completed
Midi devices were using serial port before USB even existed.
--
Thanks Steve M0ZEH


Re: DIY Arduino Midi Controller for SDRC completed

jdow
 

Real hardware MIDI ports were standard UARTs used "oddly". Of course, they speak serial port at an unusual speed. A virtual MIDI device is not restricted to MIDI wire speeds coming in if it elects to forward the data instantly rather than wait a bit to emulate the 1ms delay per MIDI notes message. Going out it MAY be limited that way. (The best example I have of that can't be free. It is a MIDI matrix as well as MIDI over Ethernet.)

{^_^}

On 20200712 09:18:17, Radioman ZeroZero wrote:
Midi devices were using serial port before USB even existed.
--
Thanks Steve M0ZEH


Re: DIY Arduino Midi Controller for SDRC completed

jdow
 

I'm letting my mind play with the concepts. If he is stuck with MIDI I can receive MIDI and spit out PostMessage commands, for an example. But I was more thinking of accepting whatever he can send and spitting out MIDI. That direction is a specialty of mine. I have a "for money" set of virtual MIDI device drivers that do such things as translate between a MIDI interface to other things, serial, Automation Direct PLCs, and so forth. So building something that picks up high speed serial, say 115.2 kHz, and spitting out MIDI notes (or other) without emulating the slow speeds of MIDI wires could give button mapping flexibility once the overall interface command set in SDRC is defined. (To be REALLY strange about it SDRC could take three MIDI notes bytes and convert that into internal "PostMessage" WPARAM and LPARAM values and give darned near 100% remote control.)

(As a side note a really simple installer tool allows both installation and a settings and testing interface. They are also very tiny. A tool tightly integrated with SDRC would not need to be expensive. Free is feasible.)

Anyway - that is where my mind wandered off to. (And don't try this at home, kiddies. The MIDI virtual driver dll has an interesting environment in which to work. Almost NOTHING you are used to using when coding tools works - even stacks.)

{^_^}

On 20200712 01:31:42, Simon Brown wrote:
Hi,
MIDI's an excellent interface, lightening fast etc. There's no real need to use anything else, although a custom USB API would also be acceptable, but NOT serial port.
Simon Brown, G4ELI
https://www.sdr-radio.com
-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: 12 July 2020 06:45
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] DIY Arduino Midi Controller for SDRC completed
I "presume" (perhaps rashly {^_-}) that this speaks to the PC as MIDI over USB, right? Can it be setup to work on some other basis such as serial port? (In principle it could be setup as a WinUSB.sys device with ZADIG and allow it to do almost anything - including accept display feedback if it grows a small
display.) Something that comes to mind is DMX512 if the serial port can be programmed to a high enough data rate.
A useful button function would be modify the functions of the rotary encoders to "seldom used" functions which might include RX selection, although the dummy rotary encoder might be best for that.
This might be a much nicer control tool than trying to bend mixer or lighting decks to do the job. And I suspect the Arduino board used is a minor portion of the project's expense.
(And *I* am not going to try to build and drill the box. When I try to work with that kind of tool +/- 1/4" is about the accuracy level I manage. Nobody taught me how to use that kind of tool as a child. So am clumsy beyond belief.)
That is an exciting looking project.
{^_-}
On 20200711 08:26:21, Andrea Dalbagno wrote:
Hello Gentlemen

Attached, you'll find (I hope :-) ) some documents on how I made a DIY
MIDI Controller for SDRC, based on Arduino MICRO.
I wish to say a big Thanks to Chris here, who gave many useful infos
and a solid starting point.
So, the "thing" can do some things (SWL oriented, for now: HAM exams on the way):
- VFO (4 tuning step);
- VFO step change;
- 1 MHz UP and 1 MHz DOWN
- MODE change;
- Filter Lower Limit increase-decrease;
- Filter Higher Limit increase-decrease;
- Filter Limits increase-decrease step (2 step)
- Volume;
- DUMMY Buttons and Encoder for experimens;
- Spare buttons for future expansions;

The Arduino sketch is conveniently commented and you will find also a wiring scheme.
You can change all you want, in the way you want.

It would be great if Simon would ad a MIDI command to Zoom IN and Zoom
OUT the
waterfall: I tried to emulate the mouse wheel with Arduino, but it
seems not possible when using the MIDI library. But may be I'm not so
clever to get it working.

73
Andrea SWL I 1360-TN

Attachments:

* DLB MIDI V_3_bb.pdf <https://SDR-Radio.groups.io/g/main/attachment/58364/0>
* DLB MIDI V_3_BOM.doc <https://SDR-Radio.groups.io/g/main/attachment/58364/1>
* MIDI_DLB_3.ino <https://SDR-Radio.groups.io/g/main/attachment/58364/2>
* MIDI_DLB_3.jpg
<https://SDR-Radio.groups.io/g/main/attachment/58364/3>


Re: Rotator for a Wellbrook antenna

Alan Lever <alanlever20@...>
 

I'm wondering now whether a cable system similar to those used on a 22 rifle range might work.



Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: billcoombes <bill@...>
Date: 12/07/2020 16:58 (GMT+00:00)
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Rotator for a Wellbrook antenna

Hello Alan,
You only need to rotate it through 90 degrees and might be able to make something with a small D.C. motor etc. I can send you some details of motors etc if it will help.
Bill - Sunny Bournemouth


Re: DIY Arduino Midi Controller for SDRC completed

Andrea Dalbagno
 

Hello Joanne

Yes, the controller is speaking to PC in MIDI over USB "language", that is native for ARDUINO MICRO and some other Arduino flavors.  As far as I know there is also the possibility to code a sketch to dialogue over the serial port, or at least to use serial protocol over a serial to usb soft/hardware "black box"(Did you mean to simulate TS2000 Kenwood protocol and connect arduino to SDRC as a CAT ?)
Unfortunately I don't have the knowledge to manage things like WinUSB.sys: my modest controller and his coding are the result of many hours of try and try again :0)
Thanks for your appreciation.
...I could assemble and drill a wooden box for you, if you need ;^)

Best regards

Andrea


Il dom 12 lug 2020, 07:45 jdow <jdow@...> ha scritto:
I "presume" (perhaps rashly {^_-}) that this speaks to the PC as MIDI over USB,
right? Can it be setup to work on some other basis such as serial port? (In
principle it could be setup as a WinUSB.sys device with ZADIG and allow it to do
almost anything - including accept display feedback if it grows a small
display.) Something that comes to mind is DMX512 if the serial port can be
programmed to a high enough data rate.

A useful button function would be modify the functions of the rotary encoders to
"seldom used" functions which might include RX selection, although the dummy
rotary encoder might be best for that.

This might be a much nicer control tool than trying to bend mixer or lighting
decks to do the job. And I suspect the Arduino board used is a minor portion of
the project's expense.

(And *I* am not going to try to build and drill the box. When I try to work with
that kind of tool +/- 1/4" is about the accuracy level I manage. Nobody taught
me how to use that kind of tool as a child. So am clumsy beyond belief.)

That is an exciting looking project.

{^_-}

On 20200711 08:26:21, Andrea Dalbagno wrote:
> Hello Gentlemen
>
> Attached, you'll find (I hope :-) ) some documents on how I made a DIY MIDI
> Controller for SDRC, based on Arduino MICRO.
> I wish to say a big Thanks to Chris here, who gave many useful infos and a solid
> starting point.
> So, the "thing" can do some things (SWL oriented, for now: HAM exams on the way):
> - VFO (4 tuning step);
> - VFO step change;
> - 1 MHz UP and 1 MHz DOWN
> - MODE change;
> - Filter Lower Limit increase-decrease;
> - Filter Higher Limit increase-decrease;
> - Filter Limits increase-decrease step (2 step)
> - Volume;
> - DUMMY Buttons and Encoder for experimens;
> - Spare buttons for future expansions;
>
> The Arduino sketch is conveniently commented and you will find also a wiring scheme.
> You can change all you want, in the way you want.
>
> It would be great if Simon would ad a MIDI command to Zoom IN and Zoom OUT the
> waterfall: I tried to emulate the mouse wheel with Arduino, but it seems not
> possible when using the MIDI library. But may be I'm not so clever to get it
> working.
>
> 73
> Andrea SWL I 1360-TN
>
> Attachments:
>
>   * DLB MIDI V_3_bb.pdf <https://SDR-Radio.groups.io/g/main/attachment/58364/0>
>   * DLB MIDI V_3_BOM.doc <https://SDR-Radio.groups.io/g/main/attachment/58364/1>
>   * MIDI_DLB_3.ino <https://SDR-Radio.groups.io/g/main/attachment/58364/2>
>   * MIDI_DLB_3.jpg <https://SDR-Radio.groups.io/g/main/attachment/58364/3>
>
>



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