John B. Stephensen wrote:
FPGAs are useful for signal processing as you can do many operations in
parallel. FIR filter, FFT and CORDIC modules are available in the free
development software from Xilinx. They are very good for processing
wideband signals or digitizing an entire amateur band
Anyone here using the RadioCom 6 software ?
Hi Paul,
Sounds like you might be getting caught up with some of your other work
and can devote some time again to digital modes:) For those who are not
aware, it was Paul's paper on ARQ concepts that lead to development of
several current uses of ham radio ARQ modes.
Some comments and
where could one finds these modes
MATTHEW A. GREGORY
KC2PUA
- Original Message
From: Rick W. [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Sunday, August 3, 2008 11:46:11 AM
Subject: Re: [digitalradio] Has anyone looked into FPGA-based digital modes?
Hi Paul,
Sounds
Hi Matt,
For the ARQ modes, the main one that works with the weaker signals is
FAE400 and is only found in the Multipsk program invented by Patrick,
F6CTE. He took the 8FSK 125 baud waveform from the old MIL-STD-188-141A
ALE protocol and slowed the speed down to 50 baud, then added
To echo what Rick stated,
FAE400 is an extremely useful ARQ mode that has a lot of potential;
robust yet reasonably narrow. Works very well, just a shame so few use it.
NBEMS is also a good ARQ suite, but a lot slower when using HF
friendly modes. No sure the lock-up time using MFSK16 has been
Paul you just hit the nail right square on the head.
I have said just that for years.
Don't say that to long and loud. The anti-wide pople
will come and get you.
John
At 08:27 AM 8/3/2008 -0400, you wrote in part:
Sound card modes, of course, have gained popularity due to their
flexibility
AA6YQ comments below
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Bill McLaughlin
Sent: Sunday, August 03, 2008 5:02 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: Has anyone looked into FPGA-based digital modes?
To echo what Rick stated,
I believe that both the AX.25 and the BBS model are OK, but that the
packet channel coding is a disaster in the sense that a single erroneous
bit trashes a frame. That fires up the retries chain that are so
detrimental to the link capacity, and may sever it as well.
Pactor does a _LOT_
I fully agree that just having a new mode that might be marginally
better than a popular mode will have a difficult time competing. While
most ragchewers would not necessarily need an ARQ mode, I personally
prefer it. But I am in the extreme minority. I used to have Amtor
contacts in old days
The ADC and DAC are certainly adequate for audio so it will work.
I've been interested in VHF and UHF high-speed modems so I have a starter kit
outfitted with a high-speed ADC and DAC that plug into J3. So far I've tested
the DDS and am in the middle of testing the second version of a 16-bit
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