[Elecraft] Adding PTT Out Switching to a K3

[donovanf at starpower.net]

Hi Pete, 


If the open circuit (unkeyed) voltage is the same polarity for both devices, 
you can connect a diode in series with each keying line. Then connect 
both diodes to the KEY OUT (not PTT !) jack. 


The voltages do not need to be identical , just the polarity 


73 
Frank 
W3LPL 





----- Original Message -----

From: "N4ZR" <n4zr at comcast.net> 
To: elecraft at mailman.qth.net 
Sent: Thursday, November 7, 2019 4:44:41 PM 
Subject: [Elecraft] Adding PTT Out Switching to a K3 

I need to be able to disconnect the antenna to my SDRs when 
transmitting. This used to be easy but now my PTT Out jack is committed 
to the KPA-1500. I'm looking for suggestions of how best to accomplish 
this - I don't believe sequencing is required, just a second PTT output. 

Ideas? 

73, Pete N4ZR 
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
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On 11/7/2019 9:30 AM, Ray Albers wrote: 
> ….thanks to comments and suggestions from K9ZTV and W2CS. 
> 
> My K3 has the Sub Receiver installed, and I have been playing around with 
> diversity reception, using a random wire connected to the sub-receiver 
> antenna input BNC connector. Apparently the carrier operated relay that 
> protects the receiver from overload is being triggered by lots of RF coming 
> into that random wire. When I disconnect the receive antenna, no more 
> clicking. Now that I know what it is, I'll just ignore it. Or maybe someday 
> I'll rig a manual T-R switch arrangement to disconnect the sub receiver 
> antenna except when actually using it. 
> 
> Thanks, gents! 
> 
> 73 
> Ray K2HYD 
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