As Dave says,
Make the modulator and demodulator available in a form easily incorporated
into existing digital mode applications
This is so very important. Olivia / MT63 is easy to implement because Pavel
made source code available. If the source for a new mode is available in a
commonly
PACTOR, being an ARQ mode is incapable of sharing a frequency with more than
one other station. That, along with the extreme bandwidth and lack of effective
signal detection makes PACTOR unsuitable for digital HF networks on anything
but a very limited scale. - A few afficianados can play
At 04:16 PM 8/4/2008 -0500,Charles Brabham, N5PVL in part wrote:
PACTOR, being an ARQ mode is incapable of sharing a frequency with more
than one other station.
The same could be said about packet if it also was an ARQ mode such
as Pactor.
I understand that some are still PO'ed that their
AX25 is also an ARQ mode.
Rud Merriam K5RUD
ARES AEC Montgomery County, TX
http://TheHamNetwork.net http://thehamnetwork.net/
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Charles Brabham
Sent: Monday, August 04, 2008 4:17 PM
To:
Charles,
What happened with Q15X25 ?? It looks promising, especially on VHF.
Can you fill us in on how it worked or didn't work?
Howard K5HB
- Original Message
From: Charles Brabham [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Monday, August 4, 2008 4:16:46 PM
Subject:
I hadn't thought of trying a high-speed VHF/UHF modem :) Maybe
that's because I live away from what most people call civilization
and there aren't many VHF/UHF signals around here.
I'd figured on using a CPU personality for overall control, and
doing the work in hardware.
Is the Spartan-3E
ARQ modes don't necessarily have to be incapable of sharing a frequency.
Consider AX.25 packet radio, which has this capability.
Pactor does not necessarily have a particularly wide footprint. Both
Pactor and AX.25 packet are 2 tone FSK modes except packet is obviously
much wider due to the
--- In digitalradio@yahoogroups.com, Howard Brown [EMAIL PROTECTED] wrote:
Charles,
What happened with Q15X25 ?? It looks promising, especially on VHF.
Can you fill us in on how it worked or didn't work?
Howard K5HB
You hit the nail on the head, Howard, about Q15x25 being especially
--- In digitalradio@yahoogroups.com, Rick W. [EMAIL PROTECTED] wrote:
ARQ modes don't necessarily have to be incapable of sharing a
frequency.
Consider AX.25 packet radio, which has this capability.
I am speaking in practical, real-world terms rather than theories
about what could be.
In
Yes, I'm using the $150 board sold by Xilinx and Digilent. The XC3S500E seems
to have just enough logic and memory for this application, but the starter kit
power supplies aren't very clean when you're digitizing signals in the low HF
range. I'Il use custom hardware with linear regulators when
AX.25 Layer 2 has been conceived as an ARQ link.
(A)cknowledge (R)e(Q)uest does not exclude sharing the channel or not.
In spanish, amateur is written as aficionado.
Radioaficionado does not have, in spanish, the slightest derogatory hint
that the early ham operator english denomination had
LDPC is to old to be under patent protection. The doctoral thesis that
defines it is from the 60s. The problem is they did not have the computing
power to utilize LDPC. It was rediscovered in the 90s.
Rud Merriam K5RUD
ARES AEC Montgomery County, TX
http://TheHamNetwork.net
-Original
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