The distributor being located in Europe, it may be the EU digital privacy
regulations come into play.
Cortland
KA5S
-Original Message-
From: raf3151019 gzero...@btinternet.com
Sent: Jul 10, 2010 4:56 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re : testing confirms
I found one really good place to put a paddle; between the seats under the
hand-brake lever, for cars that have that setup. I've considered the shift
lever -- if that's on the floor -- so one may rest his hand on the control
and still reach down for keying. I would not think the steering wheel
I would suggest an intuitive interface; stereo headphones with tracking so
turning one's head tunes the receiver, frequencies below the tuned point
sent to the left earphone, frequencies above, to the right. Now just turn
your head until something interesting is audible straight ahead, press a
There's some European DRM broadcasting in that range.
Cortland
[Original Message]
From: jhaynesatalumni jhhay...@earthlink.net
To: digitalradio@yahoogroups.com
Date: 1/11/2010 8:27:07 PM
Subject: [digitalradio] Mystery signal on 75M
I was listening on the top end of 75M this afternoon
://www.radioworld.com/article/8714
Cortland
KA5S
- Original Message -
From: J. Moen
To: digitalradio@yahoogroups.com
Sent: 1/11/2010 10:41:14 PM
Subject: Re: [digitalradio] Mystery signal on 75M
Is DRM that wide?
- Original Message -
From: Cortland Richmond
Looks nice!
Better buy now, though, because when the EUrocrats find out about this
manufacturer he is likely to be bankrupted by the regulatory requirements.
http://www.rohsregulations.com/rohs-faq.htm
http://www.cetest.nl/emc-harmonized-standards.htm
WRT the 857D DSP. Yes, it is at audio frequencies. (So is a sound card).
Still quite helpful both in rejecting signals as close as 50 Hz (depending
on mode) and lowering broadband noise. At present my 857D is on an older
KAM+ TNC that does not have PSK but I have used the 857D's DSP to help with
When US analog TV had 3579.5 KHz color burst oscillators, 3580 and nearby
was avoided because of the continuous QRM. It made sense to put CW practice
and one-way bulletins on a frequency no one else wanted to use and let the
operators tune their receivers to cut/notch out the tone. Good training!
radio systems;?
Cortland Richmond wrote:
One problem with cognitive radio is that it seems it will be designed
to detect only emissions similar to those it is meant to receive.
Therefore, it is best used in spectrum particularly allotted to
just those kinds of emissions
One problem with cognitive radio is that it seems it will be designed to
detect only emissions similar to those it is meant to receive. Therefore, it is
best used in spectrum particularly allotted to just those kinds of emissions.
This rather defeats the purpose of white space.
RMS Express
This is a generic problem: How much must a user on an adjacent frequency
take into account that his neighbor is unable or unwilling to operate at
only the bandwidth necessary for an emission? Typically, we see complaints
(here!) that while we're operating PSK 31 an emission 500 Hz away blows us
Sort of by accident sent a VERY large file (PDF of an ICS-123 form) today to
Hoby on a MARS frequency.
The good news is the throughput.
Bandwidth: 1600 ISS Mode Shifts: 11
Decode Attempts: 148
Weak R-S Decodes : 90Weak R-S Sums: 2
Strong R-S
Want and should must yield to shall and will; the Rules tell us how fast we
may go in different parts of our authorized spectrum.
Cortland
KA5S
[Original Message]
From: obrienaj k3uka...@gmail.com
To: digitalradio@yahoogroups.com
Date: 10/27/2009 10:02:08 PM
Subject: [digitalradio]
Sound card users' preference for bandwidth wide enough to receive fifty or
more signals is what makes us vulnerable. W1AW does NOT wipe out the 80m
psk31 sub-band; its CW signal occupies perhaps 50-100 Hz. Use a narrow
filter, and a front-end able to handle nearby strong signals, and the
, unless we improve our
receivers and do what it takes to live in a crowded band where different
modes must coexist with each other.
Cortland
KA5S
[Original Message]
From: Rik van Riel r...@surriel.com
Cortland Richmond wrote:
Sound card users' preference for bandwidth wide enough
FWIW, for MARS MT63 and Olivia I use a 'scope to set output and audio
levels. From time to time I've had to use 500 Watts of Olivia to be heard
by all stations! MT63 has a high crest factor, and the wattmeter will
sometimes show 500 Watts, sometimes as low as 14 Watts. But that's an
Try a different link.
http://forums.qrz.com/showpost.php?p=1632618postcount=179
It referenceses something more useful than YouTube, too.
excerpt:
Any use permit for a ham radio antenna shall include a condition that
it shall be inspected annually to certify its safety and to verify that
Also see the court decision at
http://www.wrightwoodcalif.com/kw6ww/misc/Palmdale/ZubarauMinuteOrder.pdf
Cortland
KA5
There's a lot of talk about really small antennas. Their performance is
generally disappointing, but better than nothing. Check out the HF-Pack
antenna shootouts at http://hfpack.com/antennas . They date from 2002 or
so and don't include the TAK-tenna. However, discussions in online groups
make
I have a couple of headsets with separate USB sound card emulators. They do
work with MULTIPSK, Mix-W, FLDIGI and IZ8BLY's MT-63. Have not done comparison
tests, but I do use one simultaneous with a Realtek sound card for montitoring
different radios and modes with one computer.
Cortland
KA5S
Was AE1AE in 1967; the AMATEUR call that came from was DL4AE.
Cortland
KA5S
[Original Message]
From: Rick W mrf...@frontiernet.net
To: digitalradio@yahoogroups.com
Date: 3/28/2009 8:15:36 PM
Subject: Re: [digitalradio] Easypal in MARS
I liked it better back in the early 1960's when I was
Hello Skip!
There are too many choices, which is one reason I lurk here picking the brains
of people who have evaluated a lot of them.
Which of the many digital modes ends up as MARS standards must be decided by
the State, Region and Service MARS directors. I have heard MT63 2000 Hz,
of the old AFSK RTTY tricks, and still a
good idea, is to use high audio tones to suppress audio harmonics.
Don't forget to set the actual sound card sampling frequency into whatever
software used.
Have fun!
Cortland Richmond
KA5S
- Original Message -
From: Tony
To: digitalradio
MT63 was I think the first really accessible I can't see it mode that could
deliver printable copy.
Our default *slow* digital mode is Olivia 32 bit 1K, but it is interesting that
16 bit is preferred by the cognoscenti.
For relatively short messages, speed is of less concern and Olivia
A good deal of flexibility is gained in MARS by reason of non-mode-specific
frequency allocation. I am trying to get our system to try Olivia or MT63 SSB
mode on VHF, which so far has been FM only.
FWIW, and IMHO, the HF MARS RMS system is effective because 1) it is restricted
to
Hello Sholto,
In the Yaesu FT-450 Yahoo group photo files there are a series of receive
BW scans I took with my 450, with a couple of 857 scans thrown in for
comparison. If it has a narrow CW filter, the 857 IMO wins on filtering
and its audio DPS works extremely well as an adjunct to
This is an often encountered problem. What frequency is my signal when I
am using [insert mode here]? is the subject of at least one license exam
question in US Amateur Radio tests.
In the US, government agencies and the military specify frequency by the
center of emission. For example, in
Froeliche Weihnachten, lieber Wolf, und eine shoenes Neues Jahr!
Aber was fuer Digital Radio Moden gibt's DX-Buddy.net?
(TML, aber seit 1983 habe ich kein uebung Deutschsprechen gehabt.)
Cortland
KA5S
ex DL4AE, DA1IQ, DA1GI
[Original Message]
From: Wolfgang dl...@gmx.de
To:
Conditions just now are at night hostile to even NVIS. We sometimes eke
out ground wave between MARS members here with vertical antennas below --
well below -- 3.5 MHz. Some nights I'd like something below 1.8!
Nevertheless, my mobile setup, when I have it installed, covers 160-440.
MARS
My unscientific tests so far with different packages is that MixW seems to
decode Olivia the best for me, but the lag is longest. I am using MULTIPSK,
MixW and FLDIGI at present.
Other factors enter into things, coexistence with Windows and other software
being chief for me. Today I was
I thought that might be the case, but having calibrated the sound card
clock in each of the three packages MultiPSK, fldigi and MixW, the
differences persist.I may try a better sound card.
Cortland
KA5S
[Original Message]
From: Simon Brown \(KNS\) [EMAIL PROTECTED]
To:
Nice work!
It looks to me as if there are two needs; long interleave to beat lightning and
impulsive noise, and multitone for on-channel qrm and background noise. How
does MT63 with short interleave look? How about 2K MT63? I suspect a
combination of slower rate and wider bandwidth is
Chas,
I've used a TNC on a rig's accessory connector and soundcard on its
mike-plug before. Since they use different interfaces, they can be keyed
separately.
I suspect you could use a resisitive audio mixer for audio I/O, and diode
steering to key the rig, putting all the rig interface on the
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