QRSS signals of
OE5EEP received by other stations
November 27, 2004
- First Test of a Microcontroller Keyed Beacon
I was testing a preliminary version of an ATMEL microcontroller keyer
to generate QRSS signals. This was the first on-the-air test on
Saturday, November 27, 2004, starting about 13.30 UTC on 10.140.078 Hz
with about 200mW to my dipole antenna. These transmission were not
announced to the public. While I was setting up my receive equipment
(TS440 + PC) to monitor my own transmission I already received the first
reception report of LA5VNA, Steinar Aanesland, for a distance of 1321km,
followed shortly thereafter by ON6RR, Staf Rans, for a distance of
744km. You can see that somebody is always on the watch!
The message text was "OE5EEP JN67TW" sent in QRSS1, QRSS3 and QRSS10.
The breaks within two characters seems to be a little longer than a
standard break. After looking into the code I later confirmed that it is
4 dotlengths instead of nominal 3, but it still is easy to decode.
What can I say? The keying is almost perfect and the power consumption
just a few milliamps at 5V. The ATMEL keyer will be published once it
works satisfory. I still want to add some more features...
LA5VNA, Steinar's reception of
my QRSS10 transmission. You can see how strong my signal was from the
fact that the AGC of the receiver is pumping (ie the background noise is
reduced during reception of a signal because the gain control regulates
ON6RR, Staf's reception with some frequency instability on the
signal. I still wonder where this variation comes from.
December 10 and 11, 2004 -
First Reception of OE5EEP's Signal in Australia
I had received a reception report from VK6DI, David Isele, from Western
Australia on the last week end when running a 50 mW beacon. I was not
100% sure if Dave's reception really showed my signal, because the
callsign could be decoded only partially. Friday, December 11, we
did try it again, this time with 200 mW. Attached is the screen shot
that I received from Dave! The callsign is fully readable, definite copy
of my signal. I tried again on Saturday with 50 mW and again David could
copy my signal. Overall it was a very busy week end, as can be seen from
the screen shots of the other European receiving stations (Vic, G3GKI
and Colin, G6AVK). DL6NL (sawtooth) and DL6JAN were also busy.
VK6DI, David's reception
in Western Australia (locator OF88cc, distance 13456 km!) of my 200 mW
signal. DL6NL's sawtooth can be seen about 20 Hz further up.
G3GKI, Vic's reception of OE5EEP
(50 mW), a CQ from OM0TM and DL6NL's sawtooth on Saturday, December 11.
G6AVK, Colin's reception of
OE5EEP (50 mW), DL6NL's sawtooth and an unidentified station further
below (...0TS K ?)
VK6DI, David's reception of
OE5EEP, this time with 50mW, the trademark sawtooth of DL6NL and DL6JAN
with a distinctive staircase pattern slightly above. DL6NL and DL6JAN
use FM modulated signal sources to give their signals a distinctive
pattern which is easily recognizable under borderline conditions. An
unidentified signal (OM1??) can be seen at about 10.140.004 Hz.
More to come, watch out...
last modification: December 12, 2004