Nice store Rick. Enjoyed reading it.
I for one never did give up on the black boxes. Still
have all 5 of them. Going back to the first one (PK-232MBX)
that was about 1986 or 1987. I even still have the G3PLX board
for Amtor when I jumped into that band wagon. That was
my first non RTTY digital
- Original Message -
From: John Bradley [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Sunday, March 02, 2008 10:45 PM
Subject: RE: [digitalradio] Re: Keeping NBEMS in mind
on occasion less than 100 miles on VHF and sometimes as little as 30 miles
on 80M HF
I disagree
: [digitalradio] Re: Keeping NBEMS in mind
John,
Our NBEMS for Linux now supports DominoEX-11, DominoEX-16, and DominoEX-22
with ARQ.
You might want to experiment with using DominoEx to combat flutter. However,
I suggest that yhou disable the AFC on fldigi to keep random noise from
dragging the receive
: Sunday, March 02, 2008 9:13 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Keeping NBEMS in mind
John,
Over what distance are you getting flutter or Doppler on VHF? I only get the
flutter (usually all the time!) when I try to work Charlotte, NC from
Charleston, SC
In that case, it will be necessary to switch to HF and use NVIS antennas,
which extends the range to 300 miles but with somewhat less throughput using
ARQ due to static crashes. Using ARQ will still get the messages through
without errors - it just takes longer.
73, Skip KH6TY
Not only are
Skip,
We do plan on using HD, NVIS antennas and data modes as long as they are faster
than I can receive CW (about 15 WPM accurately.
The noise level is what is so high after a hurricane...and it stays that way
for
2-4 days.
Walt/K5YFW
kh6ty wrote:
In that case, it will be necessary to
Walt,
Give DominoEx-22 or DominoEX-16 a try. Speed will probably a litttle less
than using Pactor-3. Running Emcpup live is pretty simple. You don't even
need to know anything about Linux. Patrick includes all the Domino modes in
Multipsk and you can try DominoEx under Windows, but without
--- In digitalradio@yahoogroups.com, n0sya [EMAIL PROTECTED] wrote:
How does nbems fare in weak signal conditions compared to other modes
such as olivia and mt63?
NBEMS is the software package, not an actual mode. It includes PSK31,
PSK63, PSK 125, PSK250, MFSK16 and RTTY. MT63 and Olivia
How does nbems fare in weak signal conditions compared to other modes
such as olivia and mt63?
NBEMS uses the PSK modes for simplicity of tuning, narrowness, and speed.
Other, wider modes, like Olivia and MT63, work further down under the noise
threshold than the PSKmodes. This makes them
I guess that Skip and I were typing at the same time!
Andy
--- In digitalradio@yahoogroups.com, Andrew O'Brien [EMAIL PROTECTED]
wrote:
I guess that Skip and I were typing at the same time!
Andy
Thanks for all the input, guys!
Chris/n0syq
I can see that some digital modes would not work very well for ARQ that
is decoded in real time. MT-63 and MFSK16 both have latency due to their
design. I am surprised that MFSK16 was considered, but perhaps this was
due to being the most narrow mode that also can work very deep into the
true John, but function beats pretty most of the time..
As far as FAE400 goes, I would like to try it. Too bad one
can only get it from one source. (gee that kind of makes it
just like pactor 3. I don't hear any anyone screaming bloody
murder about that.) Multipsk may be a very fine
After reading this thread with great intrust I still fail to see
the difference between it and what has been done with
the Pactor modes. That is other than being narrow.
I have copies Pactor that has to say the least been about
2 DB under ESP.
As far as FAE400 goes, I would like to try it. Too
) and
PSK250ARQ(2007,2008).
-Ursprüngliche Nachricht-
Von: digitalradio@yahoogroups.com
Gesendet: 02.03.08 18:52:31
An: digitalradio@yahoogroups.com
Betreff: Re: [digitalradio] Re: Keeping NBEMS in mind
I can see that some digital modes would not work very well for ARQ
John,
The difference is HUGE!
Pactor is a proprietary mode and the primary use is for radio e-mail.
The cost is quite high for just that one function and very few of us
digital operators will buy a single sourced foreign product for that
purpose unless we are boaters or RV'ers and want the
To: digitalradio@yahoogroups.com
Sent: Sunday, March 02, 2008 7:51 PM
Subject: Re: [digitalradio] Re: Keeping NBEMS in mind
After reading this thread with great intrust I still fail to see
the difference between it and what has been done with
the Pactor modes. That is other than being narrow
: [digitalradio] Re: Keeping NBEMS in mind
Hello John,
As far as FAE400 goes, I would like to try it. Too bad one
can only get it from one source. (gee that kind of makes it
just like pactor 3.
Pactor 2 and 3 have private detailed specifications which forbid to even
decode them (however
- Original Message -
From: Rick [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Sunday, March 02, 2008 12:52 PM
Subject: Re: [digitalradio] Re: Keeping NBEMS in mind
I can see that some digital modes would not work very well for ARQ that
is decoded in real time. MT-63
@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Patrick Lindecker
Sent: Sunday, March 02, 2008 1:59 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Keeping NBEMS in mind
Hello John,
As far as FAE400 goes, I would like to try it. Too bad one
can only
I earlier mentioned ARQ in real time, but if you use the programming
technique that KN6KB used when he developed SCAMP, (Sound Card Amateur
Messaging Protocol), he used RDFT. While this was not practical to
decode during each cycle, he was able to work in the background with the
past packet
I have seen some multiipath, especially when I have tested PSK31 on VHF,
but much of that was from aircraft. I am not sure how I can discern
multipath when on HF. Is there any clue in the waterfall or do you go by
the sound?
73,
Rick, KV9U
You will see three kinds of multipath on VHF,
I earlier mentioned ARQ in real time, but if you use the programming
technique that KN6KB used when he developed SCAMP, (Sound Card Amateur
Messaging Protocol), he used RDFT. While this was not practical to
decode during each cycle, he was able to work in the background with the
past
something a little faster than regular MFSK for a
robust mode
John
VE5MU
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of kh6ty
Sent: Sunday, March 02, 2008 4:18 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Keeping NBEMS
. I am
interested to know if you also find flutter on VHF within 100 miles.
Skip KH6TY
- Original Message -
From: John Bradley [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Sunday, March 02, 2008 9:30 PM
Subject: RE: [digitalradio] Re: Keeping NBEMS in mind
This may
Yes you must buy a box to play the mode.
What did you do before the sound card?
Maybe watch your corn grow.
As far as the email comment, I can tell you have
not seen to much if any of the pactor or packet
traffic of late. Just going on what other have said.
John
At 01:30 PM 3/2/2008, you
@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of kh6ty
Sent: Sunday, March 02, 2008 9:13 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Keeping NBEMS in mind
John,
Over what distance are you getting flutter or Doppler on VHF? I only get the
flutter (usually all
It is precisely because of the sound card that we no longer buy
expensive boxes, cards, etc.
When I got back into ham radio in 1980, it was not long before I found
that I enjoyed the digital modes. When I moved from our first farm back
to the city, I was very surprised to see one local ham who
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