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[aprssig] Using a TNC as a CW Beacon Only

Andre PE1RDW aprs at pe1rdw.demon.nl
Sun Feb 19 11:28:24 UTC 2006


I actualy have a CW beacon right here using nothing more then a 555 
timer and an eprom together with some odd bits.
You can find it on the http://www.pa3gco.com site.
It can be modded to run when you puch the ptt or run all the time, it 
can key the transmitter for you.

73 de Andre PE1RDW
scott at opentrac.org schreef:

>Looks to be pretty close to the same thing.  Actually, I think I've got a
>tube or two of those PICs on hand.  Might be a good way to get rid of 'em.
>
>I made an MR6 clone plus OT in one board, and actually launched one example
>on a few party balloons, but it's got really awful spurious emissions.  And
>that's not just my clone - it's just as bad on the genuine Ramsey board.
>I'd feel better about flying it if it had at least a basic output filter,
>something that wouldn't require custom inductors or a large part count.  I'm
>not an RF engineer, though.
>
>Scott
>N1VG
>
>  
>
>>I found this a while back:
>>
>>http://www.birch.net/~petek/rockets/RDF/id.htm
>>
>>
>>I used this guy's code and mounted a PIC 12C509 dead bug to the back  
>>of a Ramsey MR6 (actually, I built 2 of them).  THese are the backup  
>>beacons for our balloon flights.
>>
>>-Jason
>>kg4wsv
>>    
>>
>
>
>
>
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