[TowerTalk] Antenna switch isolation?

[Dick Dievendorff]

Some commercial antenna switches use multiple relays for improved isolation.

One relay (A) is connected to the antenna and switches between a contact on
relays B and C.

Relay (B) switches rig 1 between the relay A contact and ground.
Relay (C) switches rig 2 between the relay A contact and ground. 

http://www.microham-usa.com/Products/Antenna_Switches/double%20ten%20switch.
html




-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Martin Sole
Sent: Friday, June 04, 2010 10:21 PM
To: 'Martin Sole'
Cc: TowerTalk at contesting.com
Subject: Re: [TowerTalk] Antenna switch isolation?

Thanks guys,

Just trying to stay sane, hi hi! Missed a 0 off though, 1kw would be 100mW
at the other connections but truly I think it can be discounted as said. Don
mentioned achieving 60dB, I'm not an expert at how to predict or determine
quite where the RF might go but I would be interested if there are pictures
of switches that can achieve better than the ~40dB that I can get,
appreciated my test was a bit 'dirty' .

Martin, HS0ZED

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