toggle quoted messageShow quoted text
and now in germany such a fast user radio is developed around a
base station fullduplex with filters ... user end with superfast
rx tx "relais" (diode switching special ic)
as far as i know 400kb data rate so a tiny bit faster as 1k2 or
greetz sigi dg9bfc
Am 19.10.2020 um 22:13 schrieb Bill
There is a reason why it hasn't been really adopted for
APRS: diminishing returns Check out WB2OSZ's write up
Basically, higher speed needs faster key-up and settling
times which is just not available in HAM voice-grade FM
radios. Once upon a time, there were HAM data-grade
radios from vendors like Tekk, SCS, which were more than
an order of magnitude faster but all of those are
essentially gone now. Also remember that for an effective
network, both sides of the link needs fast radios.
Those were the days. 9k6 packet through a
regenerating digital Repeater (not lame bandwidth destroying
digipeater) was a thing of beauty to watch in operation.
It was not unusual to transfer (FTP) large
files. My favorite exercise was the 300K SETI work unit.
Another op used it for multiple megabyte ampr.org
domain files. Since the Repeater equalized access to the
system the other users were not noticeably affected.
Twenty five years later the Repeaters are gone
and only the Kenwood radios standout as COTS equipment that
wasn't available way back then.