100m is a very good separation on 10 meters, if you have that much space.
I was just doing some measurements this morning between two 6 element,
10 meter antennas that are about 50 meters apart. One is 25 meters high,
the other 10 meters high.
Pointed at each other at 1500 watts, 2.1 watts is delivered into a 50
ohm load. That is way too much for any receiver without protection. Even
at 150 watts, 210 mW is too much. Obviously, this is a worst case. In my
situation it would happen when one antenna is pointed JA, the other
South America. For the orthogonal situation of both antennas pointed at
EU, 1500 watts would result in only 2 mW into the other receiver.
73,
Steve, N2IC
On 11/28/2013 08:30 AM, Peter Voelpel wrote:
With 100W output I can do that without any filtering.
Antenna one is at 41m above ground and 100m away from antenna two which is
12m above ground.
10kHz difference in frequency are enough to operate SSB without qrm from
either radio.
Probably using different polarized antennas will be as effective.
For in band filtering you will need xtal front end filters.
73
Peter
-----Original Message-----
From: CQ-Contest [mailto:cq-contest-bounces@contesting.com] On Behalf Of
Kevin McGrath
Sent: Donnerstag, 28. November 2013 03:55
To: cq-contest@contesting.com
Subject: [CQ-Contest] two radios on same band (10m contest)
I would like to get some advice on running two radios on the
*same* band, specifically for 10 meters.There’s plenty of good information
here and
on the web regarding minimizing interference when running multiple radios on
different bands, but not much info at all on the same band.
The plan is to enter the ARRL10m contest, multi-op, mixed
SSB/CW, low-power (<150 watt) category and use a run radio and a multiplier
radio (only one transmitter at a time). To
help minimize interference, one radio would be on CW portion (say below
28.050)
and the other on SSB (above 28.400) and thus maintain at least a 350-400kHz
frequency
separation. Also the antennas for each radio will be different
polarizations. But
given space limitations at the QTH, the antennas can only be separated by
100’. Are
commercial bandpass filters or homebrew designs available for in-band use?
I’m guessing two
radios have been successfully used for the 10m contest. Any ideas or tips on
the setup for minimizing inter-station interference would be greatly
appreciated.
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|