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Re: Topband: Video Switch for Low Band Antenna switching

To: topband@contesting.com, n1rj@roadrunner.com
Subject: Re: Topband: Video Switch for Low Band Antenna switching
From: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sat, 04 Jul 2015 18:30:57 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>
Roger, as long as the switch is passive and not active it will work well for you as unused ports are terminate in 75 ohms. I use a 12X1 Dynairs here and they have excellent isolation plus it terminates the unused reversible Beverage feedline (which is recommended for greater rejection). I just cut the RG6 minus the VF to multiples of a half wave length so the termination at the switch appears on the unused port. I prefer this to running voltage out to relays which always seem to fail at some point.


Herb Schoenbohm, KV4FZ

On 7/4/2015 5:47 PM, Roger D Johnson wrote:
Boxbe <https://www.boxbe.com/overview> This message is eligible for Automatic Cleanup! (n1rj@roadrunner.com) Add cleanup rule <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Ftoken%3Dnp%252Bsb5oLW0EM1MiGv38HJp5SUI58ppPRSOpvKCFUJoQ%252BC1b%252F%252Fd5cjSefau95xVXwxnFmSSwUatUl%252Fd%252BX4fby4vOtZvLohd1eJzWOO5EAZyS8V5GycsrS5GFxQEdl2XY62EXybK3klIQ%253D%26key%3DA7%252F34s4sBlm2aKuS%252BezNSB0IavmYLPaMHZ73KUHql5E%253D&tc_serial=21867422542&tc_rand=1661170955&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> | More info <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=21867422542&tc_rand=1661170955&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> I've been looking for a way to switch multiple receiving antennas to multiple receivers. I know some hams are using video switchers but info on them is scarce. There is a Dynair SVA-100B for sale on eBay but no real description
of it's functions.

It seems obvious that you can, for instance, switch input 3 to output 7 but can you simultaneously switch input 5 to output 6? In other words, can you have more than one path through the switcher?

Any other ideas on switching greatly appreciated!

73, Roger




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