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2.11BSD operating system for microcontrollers
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PostPosted: Tue Feb 23, 2016 10:13 pm 
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Posts: 1092
Hi Pito,

I notice that the .nl websdr now decodes WSPR :).

If someone got the ADC running at high speed, the MZ could receive RF directly. At least 40m. No other hardware required.

Probably an RF preamp and preselector would be nice.

Sending could be as already suggested.

I think it would be really neat to have a PIC32 as an unattended RF message box. Poll for when a path is open [ like ALE ]. And then pass messages around the world.

Wiz


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PostPosted: Wed Feb 24, 2016 7:30 am 
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Location: Rapa Nui
Quote:
PIC32 as an unattended RF message box

Not sure "unattended" is allowed with HAM radio.. (except VHF/UHF repeaters stuff)..

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PostPosted: Thu Feb 25, 2016 7:13 pm 
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Hi Pito,

I guess you and I are the only one's interested in this topic?

STA (Special Temporary Authorization) is one answer.

Receive only is another.

Using Part 15 freqs is another [13.5mhz]. One FCC friend pointed out that 'radar' type systems go further since while the average power can be quite low, the peak power is much higher and further above the noise. So you have to read the 'rules' carefully.

I still think it would be neat and doable to have a receiver running on a single MZ. Maybe on the new Olimex board?

For a while there were pager companies around here that used low VHF for sending signals to their pocket pagers and 900mhz part 15 for the return channel.

Both WSPR and Olivia go quite a bit below the noise floor.

All just a matter of programming :). Something we can do in our copious spare time!

And an occasional RF 'glitch' doesn't generally get noticed :) :).

Lots of fun.

Wiz


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PostPosted: Fri Feb 26, 2016 7:06 am 
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The rules are about max power into an antenna. So it is not about average power, I think. So you cannot tx 1MW within 1us (as a mobile radar does) and claim you do 1mW average :)

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