[Elecraft] K3 and Transverters

[Don Wilhelm]

Ian,

You should be able to use the KEYOUT-LP signal line.  It is an open 
drain circuit in the K3, so depending on your transverter design, you 
may or may not have to add a pullup resistor.  The pullup can go to the 
+12 volt line or anything lower in your transverter.  I would suggest 
that a pullup resistor value of 2.2k to 10k ohms should work.  Use a 
higher value with higher voltages.  The current when the KEYOUT-LP line 
is low should be limited to 10 ma. or less.

73,
Don W3FPR

Ian Maude wrote:
> Hi all,
> I have just finished building and aligning a 4m transverter from 
> Spectrum Communications which I intend to connect ot the K3 (and 
> indeed have had working) as well as my XV144.  The 4m transverter 
> needs 0 volts to key the PTT.  Can I use pin 10 off the accessory jack?
> Are there any other things I need to know about using an Elecraft 
> transverter and a non-Elecraft one in a chain?  I am using the 
> transverter interface at 1mW.
>