Re: Introduction and HFDL question


Patrick Lindecker
 

>Firefox installed and working fine with MultiPSK!

Thanks for the information Allen. It’s not trivial to know that the problem can come from the browser.

 

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : mercredi 19 mai 2021 16:54
À : multipsk@groups.io
Objet : Re: [multipsk] Introduction and HFDL question

 

Firefox installed and working fine with MultiPSK!

 

Many thanks

 

Allen

 

On Sun, 16 May 2021 at 21:27, Ary <udxf@...> wrote:

Note that Chrome and Edge browsers are causing sound problems preventing many decoders to decode the signal properly. Try Firefox instead. That works fine.

Recordings made with the recording options of the web sdrs while using Edge or Chrome are usually good.

 

Also note that the Firefox extension PopUpOFF may cause problems with Web-based SDRs. There are no problems if you don't use this.

 

73 Ary

 

Op 16-5-2021 om 19:59 uur schreef Patrick Lindecker <f6cte@...>:

>I tried the PC-HFDL program using the Kiwi too,and got all error messages.

It is possible that the SDR demodulation used by Kiwi SdR be of poor quality, certainly sufficient for slow modulations but not for quick modulations, and especially not for PSK modulation where you need to lock the phase and to deconvolute the signal according to the transmission channel.

 

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : dimanche 16 mai 2021 19:24
À : multipsk@groups.io
Objet : Re: [multipsk] Introduction and HFDL question

 

Tried both 8 and 16 bits

No joy,still completely CRC error messages.

I’m sure it’s a problem with the Kiwi SDR.

I tried the PC-HFDL program using the Kiwi too,and got all error messages.

 

I switched to the Global Tuners site and it was much better,on both MultiPSK and PC-HFDL

 

Allen

 

On Sun, 16 May 2021 at 17:14, Patrick Lindecker <f6cte@...> wrote:

RR Allen, but I was speaking of “8 bits” on Multipsk (look at “Adjustments” on the menu bar at the top of the screen, then “AF levels+Sound card”).

 

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : dimanche 16 mai 2021 17:56


À : multipsk@groups.io
Objet : Re: [multipsk] Introduction and HFDL question

 

Patrick

I only have 16 bit options on my sound card.

See photo

I’ve also tried adjusting the levels,no change.

No change with the slight frequency adjustment either

 

Allen

 

On Sun, 16 May 2021 at 16:45, Patrick Lindecker <f6cte@...> wrote:

Allen,

 

I was thinking that for a virtual connection, as Stereo mix, the sampling frequency must be 48000 Hz strictly as it is not a physical connection. Also, once the “all errors phase” begun, try to change the audio level . or the frequency tuning (a bit) to determine the origin of the problem.

Are you in 16 bits or 8 bits? If in 16 bits, switch to 8 bits as there is the risk of switch around the bytes in 16 bits.

 

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : dimanche 16 mai 2021 16:13


À : multipsk@groups.io
Objet : Re: [multipsk] Introduction and HFDL question

 

Scrub that...after 10 minutes of not too bad decodes,it’s back to the error messages

 

On Sun, 16 May 2021 at 14:50, Allen Watkin via groups.io <allenwatkin1=gmail.com@groups.io> wrote:

Hi Patrick

I think the problem lies with Kiwi SDR.

I changed to one of the Global Tuners radios,and I’m receiving decoded messages on my MultiPSK.

 

Allen

 

 

On Sun, 16 May 2021 at 13:36, Patrick Lindecker <f6cte@...> wrote:

Allen,

 

>What puzzles me is I can decode selcal codes perfectly using the sound card stereo mix option,but not HFDL

This probably means that the signal has been distorted somewhere on the transmission of the AF signal. High speeds PSK modes as HFDL can’t bear much distortion (at least the ones implemented in Multipsk). Also check that the HFDL is not mixed with another signal (even at low level).

 

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : dimanche 16 mai 2021 13:24
À : multipsk@groups.io
Objet : Re: [multipsk] Introduction and HFDL question

 

No just using the stereo mix on my computer.I’ve tried adjusting the levels also.

What puzzles me is I can decode selcal codes perfectly using the sound card stereo mix option,but not HFDL

 

 

On Sun, 16 May 2021 at 11:47, Patrick Lindecker <f6cte@...> wrote:

Allen,

 

How do you connect the SDR online to Multipsk?

Via a physical cable from sound card output to input?

 

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : dimanche 16 mai 2021 12:37
À : multipsk@groups.io
Objet : Re: [multipsk] Introduction and HFDL question

 

Hi Patrick

Done everything you suggested,no change.

I’m using an online SDR(Kiwi),but I’m also using that for decoding selcals(and I’m getting pretty much 100% success decoding those),so I do know why I’m getting the error messages.

 

I’ve tried tuning the SDR either side of the HFDL frequency (for 8942,I’ve tried 8941.95 through to 8942.05),no luck there.

 

See attached photo

 

Regards 

Allen

 

On Sun, 16 May 2021 at 09:24, Patrick Lindecker <f6cte@...> wrote:

Hello Allen

 

Could you check this (especially the sound level):

 

Calibration of the sound card (not for SdR interfaced with Multipsk)

It is strongly recommended to calibrate the sound-card: click on the
"Adjustments" menu button, then select the "Determination of the RX/TX
sound-card sampling frequencies
" option and push on the "Determination of
the 48 KHz RX sampling frequency (test on 3 minutes)
" button. At the end of
the test, click on "Return",
Now, if the speed is very close to 48000 Hz (let's say between 47950 and 48050), it's better to manually set it to 48000 Hz.

Sound level

About the sound level ("Level" indication in % at the top of the
screen): an AF level superior or equal to 10 % is OK. About 50 % is ideal
(but not critical). In case of very low AF level, select "16 bits" in the
"Determination of the RX/TX sound-card sampling frequencies" option
("Adjustments" menu button).

It is normal to receive from time to time “CRC fails”, but not always.

Note that it can also be a problem of tuning accuracy. If you are too much far away from the nominal frequency, the digital PLL does not lock.

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Allen Watkin
Envoyé : dimanche 16 mai 2021 08:33
À : multipsk@groups.io
Objet : [multipsk] Introduction and HFDL question

 

Hi

My name is Allen,and I’ve just started using MultiPSK.It looks an impressive program too,lots of different modes I wasn’t even aware of.I listen to aero HF,and it’s spot on,practically 100% accurate in decoding selcal codes.I also want to use it to decode HFDL messages.

 

I’ve used the Charles Brain PC-HFDL program in the past,and that was always pretty accurate,but when I try to decode HFDL with MultiPSK,most of the time I get “CRC fail” messages.Seeing as the selcal codes are being decoded correctly,I don’t think it’s a problem with my sound card(I’m using the stereo mix on my PC).

 

Also,whilst watching a YouTube tutorial about HFDL,MultiPSK decoded the sound from the video successfully,but when I went back to “live” decoding,it was back to the CRC fail messages.

 

Is there any setting in the MultiPSK program I should enable,in order to receive correctly decoded messages?.Has anyone else experienced these CRC fail messages?

 

Allen

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