[aprssig] weak signal ISS packet

[Bill Vodall]

> I won't even start on about HF packet, that's stuck in even darker places than
> 1200bd VHF packet/APRS.
>
> Dave G0WBX.

Maybe HF isn't so bad.  We have 'APRS' on PSK and MSK with
APRS-MESSENGER, a HF 'tracker' is being worked on and the SCS Robust
Packet Tracker TNC is yielding some awesome world wide reception
reports.   Also the DireWolf and UZ7HO systems support 300 baud HF
packet and their bit-error-correction helps a lot.

73
Bill, WA7NWP