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Old 02-15-2017, 11:49 PM
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Default NOAA radiofax questions

Can I do it? How does it work? I'm in central cali. I'm I close enough? Can I use the iss app?
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Old 02-17-2017, 11:03 AM
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Can I do it?
Yes, of course.

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How does it work?
WEFAX is a modulation of a (typically) USB signal, centered around 1900 kHz audio frequency. Pure white is one offset from +1900, pure black the other offset. You tune your SSB receiver to 1.9 MHz below the listed frequency, set the mode to USB, and set fldigi to WEFAX mode, it will decode and save the pictures for you.

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I'm in central cali. I'm I close enough?
I'm near Detroit, and I copy the New Orleans and Boston transmissions regularly and well.

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Can I use the iss app?
I have no idea what an "iss app" is.
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Old 02-17-2017, 7:08 PM
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The iss app is the international space station app that gets radio signals via audio to send a picture or receive one. Would this work. I don't think I have an ssb receiver. Is fldigi on a of or on a radio?
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Old Yesterday, 12:51 PM
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OK, no, the ISS uses slow-scan TV modes to send their photos. That's a different mode altogether.

The closest WEFAX transmitter to you would be Pt. Reyes, north of San Francisco. Their carrier frequencies are 4344.1, 8680.1, 12784.1, 17149.3, and 22525.1 kHz. The best frequency for you would probably be 4344.1 kHz, but it's only active from 01:40 to 16:08 UTC. WEFAX broadcasts from Pt. Reyes begin at 01:40, 06:55, 11:20, 14:00, 18:40, and 23:20 UTC.

fldigi is a digital mode program for the computer, it's available for Windows and Linux, I'm not sure about Macs. You feed the received audio from the radio, into the computer's line in or microphone, and fldigi does the conversion from audio to pictures.

Even a small shortwave receiver can be used for WEFAX reception, as long as it has single sideband option.
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Old Yesterday, 3:01 PM
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Thank you. Could you show me an example of a shortwave receiver with ssb? I went online to ebay and found lots but I want to know if they work.
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