[TowerTalk] Antenna switch isolation?

[Joe Subich, W4TV]

The DX Engineering switch is a single radio switch.  The microHAM
switch being referenced is a dual radio switch.

Port to port isolation in single radio switches will depend on
whether unused ports are grounded or not, the quality of the
grounding, and whether the antennas are properly isolated for
common mode currents.

73,

    ... Joe, W4TV

On 6/5/2010 12:11 PM, Jim McDonald wrote:
> Another commercial one is
> http://www.dxengineering.com/Products.asp?ID=85&SecID=33&DeptID=17 which
> claims to have port-to-port isolation of greater than 70 dB.
>
> Jim N7US
>
>
>
> -----Original Message-----
>
>
> 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
>
>
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