[aprssig] IGates with good ears
bruninga at usna.edu
Wed Feb 16 13:32:33 CST 2005
The IGates below have good ears. You can see a statistic
on the quality of your IGate receiver by going to pcsat.aprs.org.
It can confirm that your station can hear a 2 Watt APRS signal
from 800 to 2000 miles away direct.
PCSAT-11 has a downlink on 144.39 over the USA and
so once every minute 6 times a day for about 10 minutes
(for the ast 3 years), these weak 2 watt signals from 800 to
2000 miles away are transmitted (in your area). If your local
APRS channel j ust happens to be silent for any of those weak
seconds, then your IGate may hear it and feed the packet to APRS-IS.
It doesnt take much coax loss to never hear these signals
at all even if the channel is quiet. So it is not unusual
for APRS packet stations to work just fine on the overlaoded
144.39 frequency, yet actually be quite deaf. Again, this
really doesnt matter much...
But anyway, if your station DOES capture the signal, then
you have proof that your station CAN hear a weak 2 Watt
APRS station at a great distance away. Just today I noticed
these IGates heard PCSAT-11:
WP4MXB-3: 3 times
KE4TZN: 5 times
VE3TEJ: three times
Just because you are not on here, does not mean anything.
But if you ARE on here, then it is bragging rights to a good
antenna and low loss system (and alucky break in the QRM)..
Just a factoid.
PCsat has been fully operational since 26 Jan, but just today
whent back into its crsh-every-orbit routine, so this tid-bit
will be less usefull in the future..
de WB4APR, Bob
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