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@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Martin Sole
Sent: Friday, June 04, 2010 10:21 PM
To: 'Martin Sole'
Cc: TowerTalk@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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|