Ray, I have found on Ebay some push button video switchers that have both UHF and BNC connectors. One nice thing about these units, apart from the low priced as TV station surplus throw aways, is the fact that they all terminate in 75 ohms on every unused port. I have several 6X1, a 3X1, and even a 12X1 unit Some have illumination for the selected button which is a feature I do not use. Even though they are designed for video they have excellent isolation on 160 meters. I bought both rack mount units and non-rack mount boxes and use them to route and switch the RX antennas to several units including an MFJ 1026 Noise Cancellation box. The only drawback is that there is in shack (not in the RX) an audible pop they make when a selection is made. This on VOX operation is sharp enough to trigger the VOX. I hope that some day I can find a similar switch that works with multiple miniature relays with termination of unused ports. Ever better would be an on screen computer controlled remote switch that could be mounted outside where all the feedlines shields are individual grounded via several 2.5 inch toroids. This termination is suggested since I use two wire Beverages and the RG-6 feedlines are cut for multiples of half waves so the termination in the shack appears at the Beverage feed point. Herb Schoenbohm, KV4FZ On 10/18/2014 5:24 AM, Ray Benny wrote:
I'm trying to figure out in my mind how to build a box that will allow me to select a HiZ 4 square, two beverages, an RX loop, and switch in an MFJ 1026 Noise Cancelling device using the listed RX antennas - to two radios using their external RX antenna jack. I know that I need to be concerned with isolation and grounding. Can I use several older ceramic rotary switches, relays or what? How do some of you do it? Can you share a block diagram, a schematic and maybe some construction notes? I appreciate your input! Ray, N6VR _________________ Topband Reflector Archives - http://www.contesting.com/_topband
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