[amsat-bb] weak signal ISS packet

Wayne Estes w9ae at charter.net
Sat Jan 10 22:54:37 UTC 2015

Bob WB4APR wrote:

> The use of speaker/mic connections(with pre- and de-emphasis) and direct
> modulation and discriminator demodulation can each have optimum performance.
> But there are always problems when crossing between the two.  BUT, it IS
> possible to adjust on the transmit side for a compromise between the two and
> then receivers of each type can decode pretty good.
> Though maybe 1% of hams go to this trouble.  Packet radio is NOT
> Plug-N-play.  The transmitter must be adjusted for optimum waveform!

Wayne W9AE replies:

Nearly every mobile/base ham transceiver manufactured in the last 30 
years has a "packet data" port on the rear.  I doubt that very many hams 
use microphone and speaker ports for packet data.

Wayne Estes W9AE
Oakland, Oregon, USA, CN83ik

More information about the AMSAT-BB mailing list