[Elecraft] Triggering KPA500 from 2 Radios

[Val]

David,

There should be no attenuation if you keep both transceivers on a
same band.

By the way, there is a device used mostly by the contesters who
need to share an amplifier: http://www.acom-bg.com/xvcr.html
Using it with K3:  http://www.kotarov.com/projects/k3-and-acom-2s1


73, Val LZ1VB



>I have been using my K3/KPA500 setup for quite sometime.  I am using 
>the
> standard cable between the K3 ACC port and the KPA500 AUX for 
> communications
> between the radio and the amp.  This has worked perfectly from the
> beginning.  At some time in the past, I wanted to use my Yaesu MKV 
> Field to
> excite the amp.  I connected both radios tho the KPA500 through a 
> 2-position
> coax switch.  I also connect a cable from the MKV  to the KPA PA. 
> KEY jack.
> When I switched the amp from standby to operate, there was a huge
> attenuation of the MKV's received signal.  When I unplugged the 
> K3-KPA AUX
> cable the problem went away.  The received signal level was fine and 
> the amp
> produced +/-500 watts with about 40 watts of drive from the MKV.  An 
> earlier
> message on the reflector indicated that this signal attenuation with 
> the AUX
> cable connected was likely due to voltage signals on the AUX lines. 
> I
> remove the MKV from the system and forgot about.
>
> Well, I've rearranged my operating desk and would like to use the 
> MKV a
> little; I sure do like operating "the old monster"!  Next to the K3 
> it is
> the best radio I have had on the desk.  So, back to the amp issue. 
> Has
> anyone connected two radios--one being a K3 using the AUX cable--to 
> the
> KPA500, without having to plug/unplug cables to get everything to 
> play
> nicely?
>
> 73 de K6SBA
> David in Santa Barbara, CA