Software for the Narrow Band Emergency Messaging System (NBEMS), is now
available for testing. This system maximizes the use of radio amateurs for
providing emergency communications.
The system works with most soundcard-equipped computers and is completely
contained on a "Live" CD (EMCpup), base
After years of supporting using "true RF frequency" for PSK31, I have given
up, because too many people still get confused trying to calculate the "true
RF frequency". So for our net, I now say, "Set your transceiver dial
frequency to 144.144, USB, and net control will be at 1500 Hz tone
freque
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, freq
> I made more than 1500 QSOs last month. --- In
> digitalradio@yahoogroups.com, "expeditionradio"
> wrote:
I forgot to mention that once when I was young and single, I was a victim
of an alien abduction...
Fortunately, it was a female alien!
That is something one never forgets! ;-)
73, Ski
Tony, we did extensive testing this morning on 70cm between PSK63F and
DominoEx 4, and DominoEx4, even under the severe, fast Doppler shift
almost always on that band, was significantly better copy than PSK63F
when signals were just over the noise. The minimum required S/N of
PSK63F compared to
ue characteristic of frequency hopping, at least according to
everything I could find.
Olivia 32-1000: http://home.comcast.net/~hteller/OLIVIA32-1000.JPG
73 - Skip KH6TY
Warren Moxley wrote:
Skip, can you show some more spectral comparison examples? This time
add the widest Olivia
is sent. It is
easy to see that the frequencies of the ROS carriers are not
determined by the data, but that the data is modulating each carrier
where it has been randomly placed by an independent code.
http://home.comcast.net/~hteller/compare.zip.
According to Jose, one of the characteri
Extensive testing of ROS on the air on UHF have now been concluded.
Unfortunately, ROS totally fails for UHF communications, in either 16
baud, or 1 baud variants, and using either the HF or EME channel.
Even with ROS metric readings between -1 dB and -8 dB (i.e. relatively
strong signals), R
Correction - Page 37 of the July QST.
73, Skip KH6TY
On 6/18/2010 2:31 PM, KH6TY wrote:
There is a $19.95 interface kit described on Page 37 of the June QST.
73, Skip KH6TY
When it comes to transmitting and receiving, you will need to also
connect your transceiver to the computer so that t
http://money.cnn.com/2010/08/02/real_estate/new_vulture_investing/index.htm?hpt=T2
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