Date   

Re: OFF TOPIC: Further COVID-19 Warning

Allan Isaacs
 

The Worthy Valued Friends is one hurdle Tom.

First send some samples of the sort of valuable things you would like to receive.

Address on request

Allan G3PIY

 


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Tom Crosbie G6PZZ
Sent: 30 March 2020 15:32
To: mwcircle@groups.io; IRCA@groups.io; main@SDR-Radio.groups.io; CrossCountryWireless@groups.io
Subject: [SDR-Radio] OFF TOPIC: Further COVID-19 Warning

 

Friends,

Please take very special care during this period.

If you die, your partner might sell all your gear for what they think you paid for it.

Even worse, your kids will just send it to landfill.

Please make arrangements for passing valuable equipment to worthy valued friends.

My address is available on requestb&

B

Tom G6PZZ

_._,_._,_

 


OFF TOPIC: Further COVID-19 Warning

Tom Crosbie G6PZZ
 

Friends,

Please take very special care during this period.

If you die, your partner might sell all your gear for what they think you paid for it.

Even worse, your kids will just send it to landfill.

Please make arrangements for passing valuable equipment to worthy valued friends.

My address is available on request…

 

Tom G6PZZ


Re: Notching out one frequency

Tony_AD0VC
 

Just an FYI...

The Elad S2 attenuator is actually 12db, not 20 as it inidcates in SDRC. It is the S1 that had the 20db attenuator. This issue has been mentioned before but it doesn't get fixed.

Testing (Adam Farson for example) shows that the Perseus MDS is about 6 db higher (less sensitive) than the Elad S2.

Tony


From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of jdow <jdow@...>
Sent: Monday, March 30, 2020 2:49 AM
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Notching out one frequency
 
Very likely you can add attenuation beyond the Elad's 20 dB without affecting
signal to noise ratios. I think your measurements suggested you had another
external 20 dB attenuator. Note the amplitude of the 1240 kHz peak and the noise
with the ELAD attenuator enabled. Add the external 20 dB and repeat the
measurement. That should be quite informative. If the difference in readings is
20 dB or even as low as 18 dB leave it in as that is about the best you can do.

{^_^}

On 20200329 23:04:20, George Stein - NJ3H via Groups.Io wrote:
> Hello Joanne,
>
> Thank you for your analysis.  I will study it thoroughly.  I should have
> mentioned the kind of antenna I have.  It is a Wellbrook ALA1530-S2.  This
> antenna is nominally 1 meter in diameter, with an active amplifier mounter at
> the base of the antenna.  I have the antenna mounter at about 12 feet high 40
> feet from any structure.  Inside the house is an active Bias T that feed
> directly to an Elad ASA-42 amplified splitter.  In an email exchange with a
> gentleman in Washington state, with a very similar setup, he replaced the active
> bias T with a passive bias T from Wellbrook.  He mentioned that resulted in
> alleviating his issue with a 5kw station.  In an email discussion with Andrew
> Akin, Wellbrook owner, I was told that going from the active to passive bias T
> would result in a 9db reduction in signal strength.  The passive version is 60£.
> Is this a worthwhile option for me?
>
> I will look at disconnecting the antenna tomorrow and seeing the results as
> described in you reply.
>
> If I interpret your message correctly, I should be able to attenuate the
> incoming signal and not affect the week stations that I want to receive.  I do
> not transmit on HF these days (too close to neighbors).  I do monitor FT8 just
> to see what DXCC countries I can hear (158 to date).  So my goal is not to lose
> out on the weak stations (of course on FT8 a lot of them are).
>
> I used to use Ivory, but my wife suggested a moisturizing soap, so I got the
> 99.44% reference. HI HI
>
> Thank you again, Joanne.
>
> Regards,
> George
>




Re: Dead simple Arduino MIDI controller for PTT button.

Christian Veith
 

Arduinos are nice :)

I've done something like that on my own using an Arduino Micro.

It's perfectly emulating a Midi Device when connected via USB. Sorry as i don't have a schematic of my circuit. Basically consist of just some Pullup Resistors.

  • 3 LEDs to show which Bank will be used (VFO Encoder step width x1, x10, x100)
    • Bank Switching is done via the internal button of the KY-040 VFO encoder.
  • KY-040 Encoder for VFO
  • KY-040 for Filter Low Setting
  • KY-040 for Filter High Setting
  • 10k Ohm Poti for Volume Control
  • 2 Pushbuttons to select VFO A and B
  • PTT
    • Pushbutton
    • 6.3mm Socket for external PTT in parallel to the internal PTT Button

and a bunch of KY-040 encoders for VFO, Filter Low, Filter HIGH and a Poti for Volume control.

I've attached my Arduino Sketch as well as the Midi Mapping inside SDR Console.

TX is activated while the PTT Button is held in the current version of the sketch.

When Line 47 is uncommented and Line 48 is commented out, the ptt will be a toggle switch.

Which versions somebody prefers is up to him ;)


Best regards

Chris DL5CV

Am 30.03.2020 um 11:50 schrieb Siegfried Jackstien:

nice ... if you add a few more midifunctions  (say a vfo wheel encoder?!?) ...

or 100 % overshoot for only ptt (cause an ftdi chip and cts pulled to ground does the same thing) :-)

greetz sigi dg9bfc

ps ... some space left in your case for tune wheel encoder ... wink wink

Am 29.03.2020 um 20:37 schrieb Jonathan Endersby:
Hi

While there are many ways to create a PTT button, I happened to have the right kind of Arduino handy and made myself this PTT switch. Works a treat and is a surprisingly comfortable and practical form factor.

Source code and some photos at the link below. 

https://github.com/jonathanendersby/simple-arduino-midi-button

73
Jonathan, ZS1ARB


Re: Notching out one frequency

Allan Isaacs
 

Try that suggestion of Martin’s first George and use a variable capacitor 500+500pF plus fixed of a few hundred pF to see the effect.

To get a really narrow filter with near vertical sides using just ordinary wire and cardboard tubes use two calculators noted here.

I put in your frequency with a spread of 1220-1260KHz and the shape of a 7 order elliptic filter was excellent.

You could make something in a couple of hours. Scroll down to the section at the end of this page.

http://www.radiomuseum.co.uk/SDR.html

My filter is a low pass for 200KHz, but the filter calculator gives you the option of a notch type.

You can roughly check the filter by using your SDR close to something really noisy. Suggestions a laptop or TV set etc.

Then fine tune by adding small caps using the 1240KHz signal

Allan G3PIY


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Martin via Groups.Io
Sent: 30 March 2020 11:58
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Notching out one frequency

 

On Mon, Mar 30, 2020 at 09:13 AM, Allan Isaacs wrote:

Just make a simple 1240KHz notch filter circa 50dB

10uH in series with a 1.2nF capacitor connected across the receiver input should do the trick.

If you use good quality components (High Q factor) you should be able to achieve a maximum notch depth of 50dB with about 400KHz bandwidth at the - 3dB points.

10uH = approx 45 turns on a T50-2 iron powder core.

Best to wind a few more turns on the core to start with, and then gradually remove them to get the notch on the correct frequency.

Regards,

Martin - G8JNJ

 


Re: Problems starting SDR Console server service - "Socket Bind Failure - Permission Denied"

Cathal Ferris
 

Solved..

After the previous uninstall and reinstall, I noted that I had an outstanding BIOS update due from Intel. I installed that update, and without changing anything else, the SDR server anager service came up and bound to the port after the reboot.

It's working, but I'm not entirely satisfied with myself as I don't know what was causing this issue.

Either way, thank to everyone that looked at this and offered assistance.


Re: Problems starting SDR Console server service - "Socket Bind Failure - Permission Denied"

Cathal Ferris
 

Unfortunately, the port is not in use, or at least not showing as in use by any tools I currently have at my disposal.

Attached is the current "netstat -ano" output from an Administrator cmd window. I followed up this with a service restart, and I got the same error as before.
Sysinternals TCPView also does not show 50101 in use.

It just appears that the server manager server process is somehow seeing the port in use, but the OS is not appearing to have it bound.

I've tried another uninstall and reinstall to no effect.


Re: Notching out one frequency

Martin
 

On Mon, Mar 30, 2020 at 09:13 AM, Allan Isaacs wrote:
Just make a simple 1240KHz notch filter circa 50dB
10uH in series with a 1.2nF capacitor connected across the receiver input should do the trick.

If you use good quality components (High Q factor) you should be able to achieve a maximum notch depth of 50dB with about 400KHz bandwidth at the - 3dB points.

10uH = approx 45 turns on a T50-2 iron powder core.

Best to wind a few more turns on the core to start with, and then gradually remove them to get the notch on the correct frequency.

Regards,

Martin - G8JNJ



Re: How to monitor TX quality (Hermes Lite 2)

Alan
 

So in other words, I should be looking for a clean looking signal in
the spectrum display......... but how clean? To my eye it always looks a lot worse than what you see with received SSB signals from other stations?

Max,

I do not know if the TX display accurately shows what is sent to the radio.

Seems possible to always tell which are SDR generated because they
always look very clean, sharp filter sides and no splatter. Find it hard to believe that everyone using an SDR has independent monitoring on anther SDR? Or am I wrong?

Well, I guess it is due to the processing sent to the SDR. But the only way to see your own signal and check what it really is like is to monitor the actual transmission. Even if the signal sent to it is perfect it does not mean a perfect signal comes out of the antenna socket.
No, probably most do not look at their own transmission but it is desirable and relatively easy nowadays.

Is there a guide anywhere on how to set up for clean transmitted SSB
signal without independent monitoring?

I'd think that it is the same as any other radio, do not overdrive. The exact instructions would depend on the software and SDR combination. But there is no way you can really be certain without monitoring. It just depends how worried you are.
You need to ask Simon what the TX display shows and look at your radio manual.

73 Alan


Re: Dead simple Arduino MIDI controller for PTT button.

Siegfried Jackstien
 

nice ... if you add a few more midifunctions  (say a vfo wheel encoder?!?) ...

or 100 % overshoot for only ptt (cause an ftdi chip and cts pulled to ground does the same thing) :-)

greetz sigi dg9bfc

ps ... some space left in your case for tune wheel encoder ... wink wink

Am 29.03.2020 um 20:37 schrieb Jonathan Endersby:

Hi

While there are many ways to create a PTT button, I happened to have the right kind of Arduino handy and made myself this PTT switch. Works a treat and is a surprisingly comfortable and practical form factor.

Source code and some photos at the link below. 

https://github.com/jonathanendersby/simple-arduino-midi-button

73
Jonathan, ZS1ARB


Re: Notching out one frequency

Nicholas Shaxted
 

Hi George,

I lived for a number of years very close (<5km) to the main MW transmitters in Central Scotland and used a Wellbrook loop quite successfully. Overload was a  problem when there were 1x100kw and 3x50kw on mf and one 50kw on LW.

 

I don’t see anywhere where you mentioned orientation of the loop.

 

Many of the problems you describe for me were minimised by ensure the loop  was placed exactly to null (or minimise) the signal from those stations. Sometimes a gale force wind would move the loop very slightly and listening would be compromised due to mush. Realigning the loop brought everything back in order. In my case due the strength of signals the position of the null needed to be precise.

 

The newer Wellbrook loop amplifiers design improved signal handline even more

 

Another tip I found by accident living so close to this transmitting sight was that the join at the loop amplifier to the coax had to be clean and dry. A little dampness and corrosion was noticeable again by an huge increase in mush.

 

Regards

Nick – g4ogi

 

 

 

 

From: main@SDR-Radio.groups.io On Behalf Of George Stein - NJ3H via Groups.Io
Sent: Monday, March 30, 2020 7:04 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Notching out one frequency

 

Hello Joanne,

Thank you for your analysis.  I will study it thoroughly.  I should have mentioned the kind of antenna I have.  It is a Wellbrook ALA1530-S2.  This antenna is nominally 1 meter in diameter, with an active amplifier mounter at the base of the antenna.  I have the antenna mounter at about 12 feet high 40 feet from any structure.  Inside the house is an active Bias T that feed directly to an Elad ASA-42 amplified splitter.  In an email exchange with a gentleman in Washington state, with a very similar setup, he replaced the active bias T with a passive bias T from Wellbrook.  He mentioned that resulted in alleviating his issue with a 5kw station.  In an email discussion with Andrew Akin, Wellbrook owner, I was told that going from the active to passive bias T would result in a 9db reduction in signal strength.  The passive version is 60£. Is this a worthwhile option for me?

I will look at disconnecting the antenna tomorrow and seeing the results as described in you reply.

If I interpret your message correctly, I should be able to attenuate the incoming signal and not affect the week stations that I want to receive.  I do not transmit on HF these days (too close to neighbors).  I do monitor FT8 just to see what DXCC countries I can hear (158 to date).  So my goal is not to lose out on the weak stations (of course on FT8 a lot of them are).

I used to use Ivory, but my wife suggested a moisturizing soap, so I got the 99.44% reference. HI HI

Thank you again, Joanne.

Regards,
George


Re: How to monitor TX quality (Hermes Lite 2)

Max
 

Hi Alan

So in other words, I should be looking for a clean looking signal in the spectrum display......... but how clean? To my eye it always looks a lot worse than what you see with received SSB signals from other stations? Seems possible to always tell which are SDR generated because they always look very clean, sharp filter sides and no splatter. Find it hard to believe that everyone using an SDR has independent monitoring on anther SDR? Or am I wrong?

For example, on speech peaks in the transmit spectrum window I am often seeing wide "spikes" out to the sides of the signal, not the nice constrained signal that I expect to see there? If I pull the audio level back to avoid any of those then I see hardly any power output at all.......

I can do the monitoring as I have RTL SDR and laptop so I guess I will need to set that up and test into dummy load, but obviously one does not want to need to do that on an ongoing basis.

Is there a guide anywhere on how to set up for clean transmitted SSB signal without independent monitoring?

73

Max



On Mon, Mar 30, 2020 at 08:18 AM, Alan G4ZFQ wrote:
The actual TX quality needs to be checked with an independent system.
Another SDR, if not overloaded, will act well as a spectrum analiser.


Re: Notching out one frequency

Allan Isaacs
 

George

Just make a simple 1240KHz notch filter circa 50dB and most of your worries should be over if their transmission is clean.

Having done that use the minimum amount of gain.. = sufficient attenuation.. to limit general overloading.

Allan G3PIY

 

 


Re: Notching out one frequency

jdow
 

Very likely you can add attenuation beyond the Elad's 20 dB without affecting signal to noise ratios. I think your measurements suggested you had another external 20 dB attenuator. Note the amplitude of the 1240 kHz peak and the noise with the ELAD attenuator enabled. Add the external 20 dB and repeat the measurement. That should be quite informative. If the difference in readings is 20 dB or even as low as 18 dB leave it in as that is about the best you can do.

{^_^}

On 20200329 23:04:20, George Stein - NJ3H via Groups.Io wrote:
Hello Joanne,
Thank you for your analysis.  I will study it thoroughly.  I should have mentioned the kind of antenna I have.  It is a Wellbrook ALA1530-S2.  This antenna is nominally 1 meter in diameter, with an active amplifier mounter at the base of the antenna.  I have the antenna mounter at about 12 feet high 40 feet from any structure.  Inside the house is an active Bias T that feed directly to an Elad ASA-42 amplified splitter.  In an email exchange with a gentleman in Washington state, with a very similar setup, he replaced the active bias T with a passive bias T from Wellbrook.  He mentioned that resulted in alleviating his issue with a 5kw station.  In an email discussion with Andrew Akin, Wellbrook owner, I was told that going from the active to passive bias T would result in a 9db reduction in signal strength.  The passive version is 60£. Is this a worthwhile option for me?
I will look at disconnecting the antenna tomorrow and seeing the results as described in you reply.
If I interpret your message correctly, I should be able to attenuate the incoming signal and not affect the week stations that I want to receive.  I do not transmit on HF these days (too close to neighbors).  I do monitor FT8 just to see what DXCC countries I can hear (158 to date).  So my goal is not to lose out on the weak stations (of course on FT8 a lot of them are).
I used to use Ivory, but my wife suggested a moisturizing soap, so I got the 99.44% reference. HI HI
Thank you again, Joanne.
Regards,
George


Re: Dead simple Arduino MIDI controller for PTT button.

Jonathan Endersby
 

Hi Steve

I'm using it in sdr-console.

Cheers,
J.

On Mon, 30 Mar 2020 at 08:30, M0ZEH <m0zeh@...> wrote:
What application is this used in?
Thanks Steve m0zeh 



--
Jonathan Endersby
email: arbitraryuser@...
web: www.arbitraryuser.com
skype: thejonathanendersby
twitter: arbitraryuser
mobile: +27824143129


Re: How to monitor TX quality (Hermes Lite 2)

Alan G4ZFQ
 

Should have said, mode was USB, so it is speech modes I am talking about, particularly with regard to spectrum purity.
Max,

The software TX display will show what you feed to the TX.

The actual TX quality needs to be checked with an independent system.
Another SDR, if not overloaded, will act well as a spectrum analiser.

73 Alan G4ZFQ


Re: Dead simple Arduino MIDI controller for PTT button.

M0ZEH <m0zeh@...>
 

What application is this used in?
Thanks Steve m0zeh 


Re: Notching out one frequency

George Stein - NJ3H
 

Hello Joanne,

Thank you for your analysis.  I will study it thoroughly.  I should have mentioned the kind of antenna I have.  It is a Wellbrook ALA1530-S2.  This antenna is nominally 1 meter in diameter, with an active amplifier mounter at the base of the antenna.  I have the antenna mounter at about 12 feet high 40 feet from any structure.  Inside the house is an active Bias T that feed directly to an Elad ASA-42 amplified splitter.  In an email exchange with a gentleman in Washington state, with a very similar setup, he replaced the active bias T with a passive bias T from Wellbrook.  He mentioned that resulted in alleviating his issue with a 5kw station.  In an email discussion with Andrew Akin, Wellbrook owner, I was told that going from the active to passive bias T would result in a 9db reduction in signal strength.  The passive version is 60£. Is this a worthwhile option for me?

I will look at disconnecting the antenna tomorrow and seeing the results as described in you reply.

If I interpret your message correctly, I should be able to attenuate the incoming signal and not affect the week stations that I want to receive.  I do not transmit on HF these days (too close to neighbors).  I do monitor FT8 just to see what DXCC countries I can hear (158 to date).  So my goal is not to lose out on the weak stations (of course on FT8 a lot of them are).

I used to use Ivory, but my wife suggested a moisturizing soap, so I got the 99.44% reference. HI HI

Thank you again, Joanne.

Regards,
George


Re: Notching out one frequency

jdow
 

Um, I can't tell much from those pictures because they were not all with the ELAD FDM-S2. Different front ends MUST be presumed to behave differently in the presence of noise.

One thing I can tell from the attenuator/no attenuator on the SDRC FDM-S2 pictures is that you really honestly truly assuredly want to run with the attenuator on. You actually show maybe a 5 or 6 dB drop in signal and about a 26 dB drop in noise. You are actually MORE sensitive with the attenuator in. That is partly due to the reduction in noise introduced by over-driving the ELAD's front end.

It appears you have a fairly large antenna you are working with. That means it is at least "fairly" efficient. The Perseus results hint that this is the case when its attenuator is set to 20 dB. The distance between the peak signals and the noise line does not change. That means noise coming in from the antenna is swamping any noise the receiver front end may be producing. This is extremely likely (99.44% (old person humor)) that the Elad behaves the same. This is die to several noise sources that raise best you can do WAY above the best a radio can do. With conventional radios disconnecting the antenna is a very simple test for "too much attenuation in front of the radio?" If the noise level (meter reading or noise from the speaker) drops you can likely add more attenuation without masking any signals that the natural noise external to your receiver is not already masking. At 28 MHz external attenuation can be 6 dB or so. For 2 meters, 1 dB or so for really quiet receivers. At 1.8 MHz you can add 30 dB or even 40 dB without masking more signals. This pretty much holds all the way down to the single digit kHz if I remember the graph correctly. (It actually continues on up with noise more than 100 dB in excess of a simple resistor's noise, which is the best you can do. Antenna efficiency goes down so I suspect darned few people can add 100 dB of attenuation at 40 kHz.)

Ultra low noise receivers on HF are generally a waste unless you are using something like a short whip antenna.

{^_^}

On 20200329 11:47:02, George Stein - NJ3H via Groups.Io wrote:
Hello Joanne,
Thank you for you offer to help.  We have our grandson every day, so was busy with him yesterday.  He will be here shortly, so am trying to do what you need quickly and accurately.
Attached are 5 files.
1. Elad No Attenuation 1
2. Elad No Attenuation 2
3. Elad 20 db Attenuation
4. Perseus No Attenuation
5. Perseus 20 db Attenuation
The Elad is the radio that appears more susceptible to the strong station (1240 khz).  The Perseus appears to be able to withstand the strong signal.  Per google maps, I am 1.79 miles (straight line) from the transmitter.  The station broadcasts 1000 watts both day and night.  The screen captures were made Sunday 29 March 2020 just after 11 AM PDT.
The reason for two "Elad No Attenuation" files is that as the station in question is broadcasting, the spectrum display would jump up and down.  I tried to capture both the worst and best images of the jumping.
The other files names are self-explanatory.  I tried to make the display of both radios as equal as possible covering the same frequency range and signal strengths.
You are correct.  The previous screen captures were made just a few minutes apart.
Kindly let me know if there are any other information I can provide you.
Regards,
George
Elad No Attenuation 1.jpg
Elad No Attenuation 2.jpg
Elad 20 db Attenuation.jpg
Perseus No Attenuation.jpg
Perseus 20db Attenuation.jpg


Re: Sharer J7

Mark B
 

Try the Planeplotter group. You might have better luck ;)

Mark

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