|To:||"OM7ZZ, Jozef Urban" <email@example.com>,firstname.lastname@example.org|
|Subject:||RE: [TowerTalk] Help need Vacuum Relay Isolation 1.8 to 30|
|From:||Jim Lux <email@example.com>|
|Date:||Wed, 05 Jan 2005 15:44:43 -0800|
At 02:38 PM 1/5/2005, OM7ZZ, Jozef Urban wrote:
We're builded 10 ANT / 2 Radio switch with Gigavac G2SP relays. On each ANT port are three of them used.
Looks real nice. I assume you're using the little blue relays to switch the current for the RF relay coils?
It looks like you have 3 SPDT relays on each antenna port. The first relay connects the antenna to one of two other relays. The side you're connecting to is switched to the radio. The "other side" is switched to ground?
So, the isolation from one radio to another would be essentially two relays worth.
Is the copper strip "star" in the middle designed as a 50 ohm microstripline? Or is it just a convenient size?
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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