Does not seem to Tx about rpitx HOT 12 CLOSED

Try latest version...it detects if you are running Wheezy or Jessie which seem to be the problem (DMA channel)

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SSTV appeared to transmit, but was only able to verify with the HackRF One and Portapack waterfall display. I will investigate further.

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Same here: pifm works great, but rpitx doesn't seem to transmit (tested with rtl-sdr dongle)

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When there is an issue : please report console output and details of issue. Just saying doesn't work is not helpfull to fix it !

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Ok, more investigation. With the latest pull, transmission appears to be better, specifically with SSTV:

sudo ./rpitx -m RF -i picture.ft -f 103000
rpitx Version 0.1 compiled Dec 16 2015 (F5OEO Evariste) running on Master PLL =
1000000000
Model Pi B+
Model Pi 1
Jessie
MASH 1
SampleRate=100000
WaitNano=25000 F1=205994769.664052 TuneFrequency 206000000.000000 F2=206005130.0
10562 Initial Resolution(Hz)=10360.346510 ResolutionPWMF 65.159412 NbStep=159 DE
LAYStep=14
****** STARTING TRANSMIT ********
END OF PiTx

Tx takes about 4-5 seconds. I can verify that signal is recieved by an RTL-SDR, as the SDR# waterfall display changes, but fails to decode with MMSSTV (the decode may be my problem however, I am still experimenting)

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It says it's transmitting, but I don't see anything in gqrx. When I use pifm (from pifm project), I do see and hear an fm-signal.

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Is this related to the difference in pin used? (pin 12 vs pin 7)?

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Of course! Its a completely different signal source, you need to use the
propet gpio for rpitx and for pifm as they use different pins
On Dec 17, 2015 10:27 PM, "redfast00" [email protected] wrote:

Is this related to the difference in pin used? (pin 12 vs pin 7)?

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#6 (comment).

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When using pifm, I don't attach an antenna and still receive it fine

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Can you give what the output of your command and the result rpitx give ...

2015-12-19 13:55 GMT+01:00 redfast00 [email protected]:

When using pifm, I don't attach an antenna and still receive it fine

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#6 (comment).

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Ok, coming back around to this one. I don't know what happened, but I have it working. Changed SSTV decoder to QSSTV and it worked great. I did so many things in the mean time, including a git pull recently that who knows. It works now!

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Like @redfast00 suggested, within several feet of your project the standard Raspi pins are long enough to transmit without any antenna whatsoever.

I've been known to put my oscilloscope probe into one end of my antenna and then "walk" the far end of that antenna wire from pin to pin until it shows me the correct output pin (12, in my case).

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