[Elecraft] OT: question re: antenna/rig swtich

[Rick Dettinger]

Don,

Does it matter if the rigs not in use are turned off?  I assumed that  
they would have more immunity to overload if the unused rig was not  
turned on.  The Alpha Delta instructions says the switches are meant  
to be used for switching multi antennas and one rig or multi  
receivers.  They do not mention multi transceivers.  I use two  
transceivers with one antenna but I removed the protection plug  
(Arcplug) as I wasn't sure if that was the reason they didn't  
recommend the switch for multi transceivers.  But I always leave the  
unused rig turned off.  No problem so far but I only run 100 watts  
maximum.

73
Rick Dettinger   K7MW


On Mar 5, 2009, at 5:52 AM, Don Wilhelm wrote:

> Greg,
>
> Theory says you should not have any problem.  With 60 dB isolation and
> 1000 watts, there may be as much as 1 mW at the input of each  
> receiver -
> that is 223.6 mV, which is a large signal, but still within the power
> handling capability of most receivers.
>
> In the practical world, if there are any leakage paths *around* the
> switch or coupling between the coax lines, then even though the switch
> itself provides 60 dB isolation, the system isolation may be much  
> lower
> - just how much depends on your setup.
>
> You could set it up and test at lower power - tune the other radios to
> the transmit frequency and see what the S-meters tell you.
>
> 73,
> Don W3FPR
>