[Elecraft] Reverse ALC

[Jerry Flanders]

At 01:33 PM 2/23/2008, Björn Mohr wrote:
>I am looking for a simple solution to reverse the K3 ALC input to a negative
>going ALC circuit. If you have interfaced your K3 with any amp using
>negative ALC, please let me know your solution.

Hi Björn

I haven't seen any reply to your question posted yet.

The question of the ALC compatibility has come up 
before. Elecraft have promised that they will 
provide a solution soon. See their K3 FAQ at 
<http://www.elecraft.com/K3/K3FAQ.htm>http://www.elecraft.com/K3/K3FAQ.htm 
, where they state: "Once ALC is working to our 
satisfaction, we'll provide simple interfacing 
information that will allow the use of negative 
control voltages (probably a resistive divider 
pulled up to a positive supply, or at most an op-amp circuit)."

So you might want to query Elecraft directly to 
see if this design is complete yet.

I have a K3 on order, and, like many  others, I 
absolutely need a standard negative-going ALC 
voltage to protect my Quadra in the event of an 
antenna failure while transmitting. I would 
prefer to have it working properly  inside the K3 
rather than some kludge that I have to try to add 
and then wonder if it actually works, but I will 
take whatever design Elecraft can provide.

Jerry W4UK