From Newsgroup: alt.ham-radio.packet

Hello,

I am new to packet radio, and I trying to understand HOW to get data
rates BEYOND 9600bps using stock (unmodified) equipment.

I have very many questions ... her goes ...

From looking at the technical implementation of packet, it looks like
the data is squeezed into the 2.7khz audio bandwidth envelope. Is this
totally correct?

What kind of TNCs support GMSK at 9600 and how is this connected to an
Icom 910?

In order to get more data using standard equipment, you must either
squeeze more data into the 2.7khz bandwidth or pray that some radio/
TNC allows you to get around this (is this possible?? Details please).

If you can please provide very detailed answers especially in regard
to the types of transceivers, what PORTS you are connecting to, the
types of TNCs (brand name and models help), the kind of modulation
(are you doing GMSK) ... whether high-speed packet is actually totally constrained by the 2.7khz bandwidth.

I am not so much concerned about AX.25, I really want to know whether
there is stock stuff that can flow data (saying using something like a
stock Icom 910) at FASTER than 9600bps.

Side question ... If I want to tune into a UHF signal that is plopping
data outside the 2.7kHz (audio) bandwidth, can an amateur radio grab
this? For instance there are lots of marine UHF telemetry radios that
do 400 - 4XYMHz ... I am looking at some of these that advertise data
rates beyond 9600bps but use a much bigger bandwidth (in the 10s of
kHz), but I would have to find a way to demodulate the data (either
bpsk or gmsk), which would mean sampling the rf and running through
some gmsk/bpsk demod ... gack!

Thank you,
Xav

--- Synchronet 3.21b-Linux NewsLink 1.2

From Newsgroup: alt.ham-radio.packet

On Jan 6, 3:55 pm, Xama <xama...@yahoo.com> wrote:

Hello,

I am new topacketradio, and I trying to understand HOW to get data
rates BEYOND 9600bps using stock (unmodified) equipment.

I have very many questions ... her goes ...

From looking at the technical implementation ofpacket, it looks like
the data is squeezed into the 2.7khz audio bandwidth envelope. Is this totally correct?

What kind of TNCs support GMSK at 9600 and how is this connected to an
Icom 910?

In order to get more data using standard equipment, you must either
squeeze more data into the 2.7khz bandwidth or pray that someradio/
TNC allows you to get around this (is this possible?? Details please).

If you can please provide very detailed answers especially in regard
to the types of transceivers, what PORTS you are connecting to, the
types of TNCs (brand name and models help), the kind of modulation
(are you doing GMSK) ... whetherhigh-speedpacketis actually totally constrained by the 2.7khz bandwidth.

I am not so much concerned about AX.25, I really want to know whether
there is stock stuff that can flow data (saying using something like a
stock Icom 910) at FASTER than 9600bps.

Side question ... If I want to tune into a UHF signal that is plopping
data outside the 2.7kHz (audio) bandwidth, can an amateurradiograb
this? For instance there are lots of marine UHF telemetry radios that
do 400 - 4XYMHz ... I am looking at some of these that advertise data
rates beyond 9600bps but use a much bigger bandwidth (in the 10s of
kHz), but I would have to find a way to demodulate the data (either
bpsk or gmsk), which would mean sampling the rf and running through
some gmsk/bpsk demod ... gack!

Thank you,
Xav

I should also add that the links on highspeed stuff on http://www.tapr.org/pr_links.html are all DEAD links ...
--- Synchronet 3.21b-Linux NewsLink 1.2

From Newsgroup: alt.ham-radio.packet


Here's a pretty good web site:

http://www.sonic.net/~n6gn/

Start with What's the problem...

Follow the links.. they are pretty well done.
--- Synchronet 3.21b-Linux NewsLink 1.2