[Elecraft] K2/100 into an Ameritron ALS-600 amp.

[Eric Swartz WA6HHQ - Elecraft]

Hi Forrest,

We do not provide an external ALC input to the K2 or K2/100. To be honest, 
using ALC to set your driving power limit to an amplifier, versus setting your 
drive power manually, is a bad practice that causes a significant amount of 
transmit IMD distortion and splatter. (All external amplifier ALC circuits 
have a finite response time that results in leading edge overshoot and short 
periods of amplifier overdrive.) In your case, if the driving rig was set to 
100W and you relied on ALC feedback from the amplifier to limit it to 40W you 
would be causing significant splatter across the band. :-0

Many external amplifier manufacturers (See ETO/Alpha as an example) no longer 
recommend its usage.

73, Eric  WA6HHQ
Elecraft
---

Forrest Myers wrote:

> Hello All,
>  I've been running a K2/100 SN 2827 for a couple of years now. It is a vy FB
> rig. I recently purchased a linear amp to get above 100 watts. The K2 does
> not have an external connection for ALC and I've been running it with the
> external amp through the KPA100 and trusting the K2 ALC to keep control of
> the drive power. I don't want to put over about 40 watts into the external
> amplifier so have to always remember to cut the K2/100 power back to 40
> watts before keying the rig using the external amp. This works fine as long
> as I remember to cut back the power.
>  Does anyone have any ideas on how to hook an external ALC control to the
> K2/100? One way would be to limit the power output of the K2 to 40 watts but
> that would require the use of the external amplifier for 40-100 watts. I'd
> rather not make a mod that would limit the power of the KPA100.
>  Any ideas?
> 
>  73,
> Forrest Myers
> AG4ND
> 
> 
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