Hi Tony,
The original reason we went to DominoEx instead of MFSK16 or PSK63 was
because at VHF (we were originally using SSB), transceiver drift, in
addition to multipath, is a major problem and MFSK16 is much more critical
for mistuning or drift (on SSB) than DominoEx. But, when using FM,
Hi Tony.
I suppose the reason is that we are comparing MFSK16/DominoEX over FM
versus MFSK16/DominoEX over SSB. I believe they are just different
animals. SSB only shifts signals in frequency. FM does much more
complex (in mathematical sense) transformation.
Skip is doing interesting pioneering
Hi Vojtech,
Thanks for the tip. I totally forgot about the possible effect of deemphasis
and what effect the center audio frequency might have.
Our goal with NBEMS has always been able to reach at least 100 miles
reliably, in order to span the largest expected disaster area to reach
Internet
Hi all!
Are there CoA frequencies with RFSM8000 between individuals or
dedicated frequencies with automatic stations or servers or gates with
RFSM8000 modulation?
We have done some good tests regionally here and would like to connect
stations mostly in europe for EmComm tests.
73 de Wolf,
I have RFSM8000 installed on a machine here in Canada, although it is not
currently running. I have had some difficulty contacting Dmitri, and
wondered
if he is still actively pursuing RFSM8000. Have you heard from him ?
As a result we have been testing Pactor 3 for the same purpose.. it
Hi John!
I contacted Dmitri some months ago and he sent me a trial code for
hams. In the meantime he released the version 0.535 but I did have no
contact with him the last few weeks. So I think he is still working on
RFSM8000.
In our local tests pactor3 has won the 'competition' :-) Because of
Hi Wolf,
Be sure to keep us informed as to your results.
It is ironic that we can not use MIL-STD-188-110A type modulation here
in the U.S. HF ham bands, at least not in the text RTTY/Data areas, with
the requirement to keep the baud rate of any one tone no faster than 300
baud. The RFSM
Rick et al!
--- In digitalradio@yahoogroups.com, Rick W mrf...@... wrote:
Hi Wolf,
Be sure to keep us informed as to your results.
Yes I will share our experiences here in the group.
It is ironic that we can not use MIL-STD-188-110A type modulation here
in the U.S. HF ham bands, at
Hi Wolf
we have the same problem here, waiting for warm WX to do antenna work, not
like our cousins to the south.
Keep us posted... By the way, also had the ham key, but it has become
corrupted , so RFSM8000 thinks my call is OK5tw or something like that
John
From:
The non-standard protocol is a slightly slower, but less bandwidth to
fit in the passband of many ham rigs. The baud rate is still 2400 baud
of course so can not be used in the HF RTTY/Data portions of the bands
here in the U.S. It may be legal in our MF (160 meter) band and in the
phone/image
Hi All,
I am hoping with the number of members in this group that someone might be able
to answer my question.
Many years ago, as we know radio started off with CW, then AM was developed,
with an improvement to only use one part of the AM carrier to produce SSB with
carrier or SSB suppressed
-
What about...
Angle modulation
Double-sideband reduced-carrier transmission
Double-sideband suppressed carrier
Hierarchical modulation
Higher-order modulation
Wavelet modulation
-- In digitalradio@yahoogroups.com, Gmail - Kevin, Natalia, Stacey
Rochelle spar...@... wrote:
Hi All,
Andrew,
Now that you mention it I have heard of DSB suppressed carrier, but none of the
others. But isn't DSB acutally AM? Either with or without the carrier? I will
have to look at this.
I will have to have a look at these other modes, couple of them sound
interesting.
Thanks for the info
--- On Sun, 2/22/09, Gmail - Kevin, Natalia, Stacey Rochelle
spar...@gmail.com wrote:
From: Gmail - Kevin, Natalia, Stacey Rochelle spar...@gmail.com
Subject: Re: [digitalradio] Re: Modes - What are they and What about New
Developement??
To: digitalradio@yahoogroups.com
Date: Sunday,
I was able to contact Mark, WB9QZB, and he indicated that his yahoo
e-mail account and the group were disabled by Yahoo with no notice or
explanation.
It is very difficult to even contact Yahoo customer service, which is
offshore, but he is working through corporate in California to attempt
Hi Kevin,
Perhaps it might help to use the ITU three symbol Classification of
Emissions?
The first symbol considers the main carrier modulation with letters such
as A = DSB AM, B = independent sidebands, etc. This would give you the
AM modes and the F = FM and G = PM modulation types.
Then
Just a note here to anyone who is the owner of any Yahoo Group. NEVER
have just a single owner email address. At a minimum use a second
email address of your own from a different domain and make that person
an owner too. If there is only one owner and that address bounces for
some reason you
There are three characteristics you can change on an RF signal:
amplitude (CW, AM, SSB, etc), phase, and frequency. Even then if you
squint a little phase and frequency modulation become basically the
same. So the fundamental methods of modulating a signal are all known
and used. Nothing new
Vojtech,
Thank you for that explanation. I didn't know the modulation mode would make
a difference. It would have been interesting to test the theory with Skip.
Unfortunately, we live too far apart for VHF/FM.
Thanks again...
Tony - K2MO
- Original Message -
From: Vojtech Bubnik
Skip,
The surprise was an unexpected, consistent, fast flutter which did not
seem to
affect FM nearly as badly as SSB.
I recently had a 100+ mile QSO on 2 meter CW. The contact involved a lot of
aircraft scatter with frequency shifts in excess of 50Hz. There were other
signal components
Hi Wolf,
1806.0
--- In digitalradio@yahoogroups.com, Wolf, oe7ftj wolf.hoel...@...
wrote:
Hi all!
Are there CoA frequencies with RFSM8000 between individuals or
dedicated frequencies with automatic stations or servers or gates with
RFSM8000 modulation?
We have done some good tests
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