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[aprssig] Parallel UHF APRS level-4 node system.

Stephen H. Smith WA8LMF2 at aol.com
Tue Dec 28 20:00:45 UTC 2004


John Denison wrote on 12/28/2004, 2:36 PM:

 > We left 1200 baud
 > behind years ago in computer modems, so why is ham radio still lingering
 > behind? If high speed data occurs on wireless routers at 2.4 GHz, then
 > there is no reason why we can't meet or exceed that standard with our
 > own implementations.

The whole idea was that 1200 baud data in Bell 202 AFSK format can be 
stuffed into the mic jack of any <<UNMODIFIED>> FM transceiver and taken 
off the speaker terminal on receive.

Higher baud rates require that connections be made directly to the 
radio's innards (i.e. receiver discriminator and DC-coupled to the 
radio's transmit modulator).

Given the extraordinary amount of bandwidth expended on this and other 
lists about merely wiring trivial cables between GPSs, TNCs, TinyTraks 
and radio mic/accessory jacks, it may be unreasonable to expect large 
numbers of mainstream appliance operators to actually CUT INTO THEIR 
RADIOS to implement greater-than-1200-baud data transmisssion.




Stephen H. Smith                wa8lmf (at) aol.com

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