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" <[email protected]> To: "Topband Mailing List" <[email protected]> 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 ************************************************ _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
