Date   

Re: 3.0.20 Released

Terry_G0EZY
 

Hi Simon
Many thanks for the update. New version works perfectly with Win7-64, without the video as expected. The original and the new also work perfectly with my other Win10-64 4G I7 system

I'm sorry if my first post seemed to be a criticism or whinge, I was just trying to report what happened without waffle. I fully accept that Win7 compatibility will have to be sacrificed so that you can continue to advance the S/W and make use of the changes/additions in Win10 and future Windows O/S.. I also very much appreciate using the software on a free/donation basis.

I have a lot of legacy/classic receiver hardware that doesn't work with Win10 (or SDR-Console) but it has been convenient to have everything on the same machine. I guess I will need to run a separate legacy system in future.

Thanks again

Terry G0EZY


Re: 3.0.20 Released

Simon Brown
 

Hi,

 

I also updated the new FAQ: https://www.sdr-radio.com/faq

 

Myself, I would update the PC to W10, you can do this for free: https://www.sdr-radio.com/windows-upgrade

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Mark Pettifor
Sent: 03 February 2020 14:10
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3.0.20 Released

 

Thanks Simon for the clarification, and my apologies for misrepresenting that SDRC itself doesn't work on Windows 7. I hadn't completely woken up yet....

 

Nothing is obsolete if it does what I need it to. So yeah, I guess I'll stay on my old-fashioned rocking chair on the porch and listen to stations from around the world on Medium Wave using a Perseus SDR from 10 years ago, and whatever software I can find that works with it, among which is Simon's SDR-Console.

 

Mark P

KC9DOC

 

 


Re: RF Clipper Diode Design

Michael.2E0IHW
 

That was my concern, Martin.

Even though challenging for VHF diy, further details
of the theory and practice would be appreciated.

Michael 2E0IHW

On 03/02/2020 13:38, Martin via Groups.Io wrote:

My understanding of the problem is that he is trying to receive weak FM Band II broadcasts signals in the presence of strong local transmissions.
...
The filters that we used were often a 1/4 wave loaded line or helical, enclosed within a metal tube about the size of a domestic fire extinguisher, and each one was tuned to a specific transmission frequency, so unfortunately it's not really a practical solution for
home use.
Martin - G8JNJ


Re: 3.0.20 Released

Mark Pettifor
 

Thanks Simon for the clarification, and my apologies for misrepresenting that SDRC itself doesn't work on Windows 7. I hadn't completely woken up yet....

Nothing is obsolete if it does what I need it to. So yeah, I guess I'll stay on my old-fashioned rocking chair on the porch and listen to stations from around the world on Medium Wave using a Perseus SDR from 10 years ago, and whatever software I can find that works with it, among which is Simon's SDR-Console.

Mark P
KC9DOC


Re: 3.0.20 Released - Update

Simon Brown
 

Hi,

 

https://www.sdr-radio.com/release-notes

 

This kit should fix the W7 / All 32-bit crashes.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown via Groups.Io
Sent: 03 February 2020 07:26
To: SDR-Radio.com <main@SDR-Radio.groups.io>
Subject: [SDR-Radio] 3.0.20 Released

 

SDR Console 3.0.20 available, includes its own MP4 video recorder.

 

https://www.sdr-radio.com/release-notes#Release3-0-20

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 


Re: 3.0.20 Released

Simon Brown
 

Hi,

The API I use doesn't work on Windows 7, the rest of the software runs on Windows 7 ok.

Simon Brown, G4ELI
https://www.sdr-radio.com

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Mark Pettifor
Sent: 03 February 2020 11:57
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3.0.20 Released

Unlike Terry, I kind of expected new releases to still work on Windows 7 for at least a while yet.

I think I read somewhere that 70% of desktops are still using it.

Why did you cut off support for Windows 7 so soon after MS cut off support for it? (And technically they didn't stop supporting it, if you want to pay money for extended support.)

Mark Pettifor
KC9DOC
EN71 Goshen, IN


Re: RF Clipper Diode Design

Martin
 
Edited

My understanding of the problem is that he is trying to receive weak FM Band II broadcasts signals in the presence of strong local transmissions.

In order to prevent the SDR becoming overloaded whilst still having sufficient RF gain and sensitivity to receive  the weaker stations, it is necessary to notch out the strongest signals in order to make better use of the available dynamic range of the receiver in question.

With this frequency spacing at this frequency, the desired fractional bandwidth of the notch filter is very small, requiring some form of High Q resonator.

During one of my previous lives as a TV & Radio broadcast transmission engineer, I have used something similar on Band II FM relay stations, where it was often necessary to notch out transmissions from the site in order to be able to receive the wanted signals that were to be rebroadcast.

The filters that we used were often a 1/4 wave loaded line or helical, enclosed within a metal tube about the size of a domestic fire extinguisher, and each one was tuned to a specific transmission frequency, so unfortunately it's not really a practical solution for home use.

Regards,

Martin - G8JNJ


Re: 3.0.20 Released

Kriss Kliegle KA1GJU
 

Ditto! (Marks comments)
 
     I just picked up an HP laptop with an i3 for very small quid (money) on Craigslist. Took a LONG time for W10 to wipe and reset (about 4 hours), but I now have another machine to be dedicated for server service. The i5's and i7's I got from Craigslist are just too sweet to be sitting in the basement or repeater shed for server service.😉 I was hesitant about the switch to W10, but now it's my preferred OS.
   BTW, the i3 runs SDRC, even via WiFi just fine, with no stuttering!

   If somebody wants to dwell in the past, I have a stack of Acer netbooks with Windows XP available! 😆


73 Kriss KA1GJU


Re: 3.0.20 Released

Mark Cayton <oldjackbob@...>
 

It's rather presumptuous (and selfish) to expect Simon to remain chained to obsolete technology (and Windows 7 is unarguably obsolete) just because a user of his FREE software doesn't feel any need to modernize.

In today's world, if you can't run with the big dogs (and Simon is a Big Dog), stay on the porch.
-- 
Mark  K1LSB


Re: 3.0.20 Released

Mark Pettifor
 

Unlike Terry, I kind of expected new releases to still work on Windows 7 for at least a while yet.

I think I read somewhere that 70% of desktops are still using it.

Why did you cut off support for Windows 7 so soon after MS cut off support for it? (And technically they didn't stop supporting it, if you want to pay money for extended support.)

Mark Pettifor
KC9DOC
EN71 Goshen, IN


Re: 3.0.20 Crashes

Peter
 

Hi Simon,
We DID catch that bug in the test team, you had it fixed in build 1768 ( Jan 29, 2020, 09:01:22 )  !!!
Pete.


Re: RF Clipper Diode Design

goscickiw
 

I think it's sort of solved with the 100.9MHz signal. I had automatic IF gain set, the signal became better after I changed it to manual.
In case of other weak signals, I tried with a 4-20dB variable attenuator and they became much worse or disappeared, while the strongest signals stayed just as good. Same situation when I use a short piece of wire or a smaller antenna.

These signals come from different transmitters so a directional antenna would help, but the problem here is space. I can't put a 5 element FM Yagi on a wall.

Also something I should have mentioned, my antenna doesn't have a direct line of sight to the transmitters because of location - surrounded by higher buildings. Putting it on the roof would probably help, but would require much convincing of other residents. It's a vertical folded dipole.

Here is how the signals look like on the spectrum in normal conditions - no attenuator.


When I increase the RF gain by 1, the spectrum becomes this mess:


With an attenuator:
 

I'm not sure why this subject expanded in this direction... Originally I wanted to protect my HackRF One, that I use just for testing stuff like modulators and usually don't connect an antenna to it, from accidentally giving it signal stronger than its nominal -5dBm... Then I started talking about receiving FM. WTF brain.


Re: 3.0.20 Crashes

Simon Brown
 

OK,

Off with the hound...

Simon Brown, G4ELI
https://www.sdr-radio.com

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of John Barnett
Sent: 03 February 2020 09:48
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3.0.20 Crashes

Hi Simon, I am using 32bit Windows computer too old to run 64bit.

John


Re: 3.0.20 Crashes

John Barnett
 

Hi Simon, I am using 32bit Windows computer too old to run 64bit.

John


Re: 3.0.20 Crashes

Allan Isaacs
 

My Win 7 x64 does the same Simon.
The audio continues but the program isn't shown in Task Manager
applications.
The Wait box changes to a crash dump window after a few minutes and closing
this kills the audio.
Restarting the program starts it up in a previous incarnation tuned to a
different frequency.
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Simon Brown
Sent: 03 February 2020 09:25
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3.0.20 Crashes

John,

I assume you're using 64-bit Windows? I'll build a kit now which you can use
to generate the crash dump. I'm annoyed that we didn't catch this crash in
the test team.

I'll e-mail you direct.

Simon Brown, G4ELI
https://www.sdr-radio.com

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of John
Barnett
Sent: 03 February 2020 09:11
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] 3.0.20 Crashes

Hi, Installed 3.0.20 and when I select the rec/playback tab the program
crashes! I have two crash dumps if you would like me to attach or post a
link to each one is 150 and 160Mb in size.

OS Windows 10 Home with all updates.
John.


Re: RF Clipper Diode Design

jdow
 

They are all pretty close in frequency. Exotic resonators might be needed. And even the 100 W signal would need to be attenuated somewhat. These babies do not have a 120 dB plus instantaneous dynamic range meaning weakest detectable signal at the same time the very strong signal is present within the RF passband of the front end.

{^_^}

On 20200203 01:30:54, Allan Isaacs wrote:
If you get 30 to 40dB skirts from a tuneable bandpass filter wouldn't that
do the job re 100W versus 120KW? You may need a 3-gang tuning 500pF
capacitor and a set of carefully matched coils.
Allan G3PIY
-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of jdow
Sent: 03 February 2020 09:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] RF Clipper Diode Design
In his particular case replacing the antenna with a paperclip, bent or
unbent,
would probably work. A large attenuator in the antenna lead would also do
the
trick. He's not exactly trying to receive a weak signal. It's simply weak
compared to what is around it.
He needs the band stop filter if he wants to wander out to OTHER weak
signals.
But 100 W next to 120 kW at 3 km distance is one bodacious humongous
whomping
big signal.
{o.o}
On 20200203 00:48:02, Allan Isaacs wrote:
Back in the 1920s and 30s a common problem was reception of weak signals
in the
presence of strong local broadcasts (not that I remember.. I just read
about it).

The answer was to design a proper RF front end with bandpass tuning etc.

There's nothing wrong with constructing a tuneable front end for an SDR.
In fact
the graphical presentation of the spectrum makes it easy to align such a
tuner.

Combine this with a directional loop antenna and you have a perfect
general
solution.

Allan G3PIY


Re: RF Clipper Diode Design

Allan Isaacs
 

An SDR is pretty good as a substitute spectrum analyser for making filters.
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Michael.2E0IHW via Groups.Io
Sent: 03 February 2020 09:18
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] RF Clipper Diode Design

A notch rejection filter should help, but would need expertise
to design for each given frequency.

Michael
2E0IHW
..............................................................


Re: 3.0.20 Released

Terry_G0EZY
 

Never expected video record to work on Win7 but the audio and IQ worked on previous SDR-C versions with Win7.


Re: RF Clipper Diode Design

Allan Isaacs
 

If you get 30 to 40dB skirts from a tuneable bandpass filter wouldn't that
do the job re 100W versus 120KW? You may need a 3-gang tuning 500pF
capacitor and a set of carefully matched coils.
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of jdow
Sent: 03 February 2020 09:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] RF Clipper Diode Design

In his particular case replacing the antenna with a paperclip, bent or
unbent,
would probably work. A large attenuator in the antenna lead would also do
the
trick. He's not exactly trying to receive a weak signal. It's simply weak
compared to what is around it.

He needs the band stop filter if he wants to wander out to OTHER weak
signals.
But 100 W next to 120 kW at 3 km distance is one bodacious humongous
whomping
big signal.

{o.o}

On 20200203 00:48:02, Allan Isaacs wrote:
Back in the 1920s and 30s a common problem was reception of weak signals
in the
presence of strong local broadcasts (not that I remember.. I just read
about it).

The answer was to design a proper RF front end with bandpass tuning etc.

There's nothing wrong with constructing a tuneable front end for an SDR.
In fact
the graphical presentation of the spectrum makes it easy to align such a
tuner.

Combine this with a directional loop antenna and you have a perfect
general
solution.

Allan G3PIY


Re: 3.0.20 Released

jdow
 

Will Not Ever Work On Windows 7. Might work on 8.1.
{^_^}

On 20200203 01:18:44, Terry_G0EZY wrote:
After installation of 3.0.20 on a Windows 7 64 bit system, clicking on the top menu item: Rec/Playback causes program to shut down. No error message just the "Please wait" bar. shown for a couple of seconds, then I have to re-start the program
I realise the video record won't work with Win7 but hoped the other recordings (AF/IQ) would be still OK but can't access these options now.
73 Terry

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