[TowerTalk] Budget 4-Pack?

[jimlux]

Gregory Fischer wrote:
> http://home.comcast.net/~kk1l/kk1l_2x6switch/TwoRadioSwitchDocumentation.pdf 
> 
> 
> Take a look at this solution.  Less expensive and provides the lockout 
> from the control unit.


I'm not so wild about that design.  If a relay fails closed/stuck, you 
can short one radio to the other by closing another relay, and there's 
no failsafe mechanism to provide feedback to the controller.

say RLYA-2 fails stuck closed.  When you turn on RLYB-2, radio A is 
connected to radio B.

if those are actually SPDT relays, you do much better by using arranging 
them differently.