[Elecraft] Re: RF Coupleing

[Bill NY9H]

that is why the Top Ten AB antenna switches use two relays to gain isolation...

bill

At 02:04 PM 7/17/2008, Jim Brown wrote:
>On Wed, 16 Jul 2008 21:15:14 -0700, Ron D'Eau Claire wrote:
>
> >In this case Eric is saying there may be a leakage path through a relay.
>
>Right. Almost all problems have more than one component. In problems like
>this one, the sum is the algebraic sum of all of the leakage paths.
>Relays DO have capacitively coupled leakage. I think I'm hearing numbers
>on the order of -60 dB, which is pretty respectable for an antenna relay
>or switch. I've measured numbers on the order of -50 - -55 with the Alpha
>Delta switches.
>
>73,
>
>Jim K9YC