Winradio excalibur FAX decoding

[radiodude817]

Having a problem with getting the Advanced FAX decoder to decode a fax. Looking for any info. Looked through the help and it wasn't that helpful. I have copied fax for years with a universal M-8000. I don't see any way to sync the FAX signal to the decoder. In USB and subtracted the 1.9 khz with the "Wait for start" tab active nothing happens. I do see the clipping "light" triggering.

 

[majoco]

Sat Fax or HF Fax? Got the 'Start Tone' set up correctly in the "setup" screen......

 

[radiodude817]

Thank you for the reply.

This is for HF FAX. I set the subcarrier time on & time off to 3 seconds per the help.

The start / stop tone detection is set as follows.

Demodulation set to FM.
Start 1 = 1500 hz Amp = 1.0 Legnth = 1.5 s
Start 2 = 675 hz Amp = 1.0 Legnth = 1.5 s
Stop = 2300 hz Amp = 1.0 Legnth 1.5s
Then I changed the stop to to 2076 hz to get 576 hz for shift. I then set it back to 2300 Hz.

I have Active & squelch selected & deselected is enable Start 2 & Start 2 IOC/2.

From reading the help the FAX signal I am tryiong to receive is a single signal and therefore I disabled
Start 2. I have a very strong signal.

With the "Receiving" tab active I clicked the "Wait for Sync" which seemed to force start the FAX. The image was mostly white with some wavy lines. No inteligable information.

Thanks.

 

[majoco]

I think you have it all wrong. Don't have time to research at the moment - I'll get back to you. From memory the HF fax tones are 300 for start, 450 or 600 for stop - there's no subcarrier - that's for the satellites.

 

[radiodude817]

Thanks,

I seem to be receiving the schedules ok the type is perfectly readable but, the map images are washed out.
On the latest map I can make out the shoreline of the East coast but, not much else.

 

[majoco]

Aah - OK! I don't have the WinRadio decoder but use another with my NRD515 - the contrast between black and white is improved with audio signal level (which you probably can't adjust) and accurate tuning - if you have a bandscope in the WinRadio decoder, does it show both frequencies? Do the stop/start tones work with the schedule page? Theschedule page is printed in BOLD characters which is why it is more readable.

 

[radiodude817]

Yes, the start & stop tones work. I am now getting som immages but, they are really wavy I have been playing with the Rows/minute setting to see if I can correct it more.


Thanks

 

[majoco]

Ok here's the data plucked out of the programme "WxSat" which is what I use.
Black frequency 1500Hz
White frequency 2300Hz
Start tone 300 or 674Hz
Stop Tone 450Hz
RPM 120 (rows per minute? Thats revs per minute - the old systems used a rotating drum!)
Don't know about the FM demodulation - it's an SSB signal of two tones. I don't think I have any choice!

If your picture slants then the clock frequency is wrong - there should be somewhere to adjust it. You usually have to draw a line down the (nearly?) vertical side of the pic with the mouse then click on something else and some sums work out what the error is and changes the clock!

 

[radiodude817]

Thanks,

The modulation is FM for HF FAX using USB. My values are the same except for the start tone. Mine was off
a little I have changed it and we will see.