[K3] [Elecraft] ALS-600

[Don Wilhelm]

Joe,

The setup is about the same as for any amplifier - coax from the K3 to 
the amp's RF input, K3 KEYOUT to the amp's PTT IN (or relay control or 
whatever it is labeled).  Set the K3 CONFIG:TX DLY parameter to be at 
least as long as it takes for the amp to switch from standby to transmit. 

Leave the ALC unconnected, and adjust the per-band power levels in the 
K3 CONFIG:PWR SET menu so you do not overdrive the amplifier on any 
band.  This assures more linear operation than relying on the 
amplifier's ALC to limit the power.

If you insist on using the K3 ALC input, be sure your K3 has the change 
to use negative going ALC ( early K3s did not - sorry but I don't know 
the cut-in serial number) and connect the amp's ALC output to the K3 ACC 
connector pin 15 (the ALC return to ground at pin 12).  See the details 
on the negative ALC mod at the Elecraft website - link at the bottom of 
the K3 page for K3 Enhancements and Application Notes (Mod Kits).

See page 27 of the Rev D Owner's Manual for the full information.  The 
manual for your amplifier should provide the standby to transmit time 
requirement - if not, query the manufacturer or measure the time from 
PTT (or KEYIN) to closure of the relay(s) with a 'scope.

73,
Don W3FPR

Joe G wrote:
> Could someone tell me hoe to hook my ALS-600, Relay and ALC outputs, ro 
> the K3
>
>
> -----
> Joe
> W1JGS
>   
>