Hi Pete,
I think you have to switch both, input and output, since if the
other inputs are not switched off, they will be seen as a paralel impedance,
thus, altering the behaviour. Although, I wonder how much would that really
affect.
Here you have an interesting design from YU1LM, mainly places the
switches in different way.
http://yu1lm.qrpradio.com/bp%20yu1lm.htm
Regards!
----- Original Message -----
From: "Pete Smith" <[EMAIL PROTECTED]>
Sent: Tuesday, May 13, 2008 4:46 PM
Subject: Bandswitching BPF modules - softrock Lite+xtall 8.3
> Is there any particular good/best way to switch the bandpass filter
> modules? I am working out a design for a bandswitched SoftRock Lite+Xtall
> and the 5-pole BPF modules are a bit of a challenge. Do I need to switch
> all 5 leads, or would it suffice to switch the three on the output side,
> while paralleling the antenna input and return ports of all 4 modules.
>
> 73, Pete N4ZR
