Hi Gary,
The most efficient way to share a Beverage among two (or as many as four)
bands to use W3LPL bandpass filters. Loss of each filter is in the order
of 1.5 dB vs. about 3.5 dB for a typical Magic-T combiner/splitter.
http://www.k1ttt.net/technote/w3lplfil.html
Just connect the inputs of both filters to the Beverage antenna and the output
of
each filter to each radio. The reason this works so well is that the impedance
of the filters is very high outside their pass bands.
I have dozens of these filters in my station; they're inexpensive, very
effective
and easy to build.
73
Frank
W3LPL
----- Original Message -----
From: "Gary K9GS" <garyk9gs@wi.rr.com>
To: "Topband Mailing List" <topband@contesting.com>
Sent: Friday, March 14, 2014 1:13:44 AM
Subject: Topband: Passive Receive Antenna Splitter
Can anyone point me to a design for a splitter for sharing a Beverage
antenna between two receivers? This is for Field Day so these are not
optimized Beverages by any means.
Just want to allow the 80/40M stations to share antennas. Nothing fancy.
My thoughts are to just use a CATV "2-Way" splitter at the output of the
Beverage matching transformer and run separate feed-lines to each radio.
I'm pretty sure these things work down to 1 MHz but have not measured
them. I can use the pre-amp in the radio (K3) to compensate for the loss.
Thoughts?
--
73,
Gary K9GS
Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com
CW Ops #1032 http://www.cwops.org
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