[Elecraft] K3/HL-1.2Kfx

[w5ov at w5ov.com]

This subject comes up occasionally, and I would remind all of you that
Tokyo Hy-Power recommends the proper adjustment and use of ALC to provide
a safety limit on your power output from your radio - not a contast
"throttling" of your radio's output that would cause distortion like some
other solid state amp company seems to recommend(?).

ALC in the context of a solid-state amp is not equivalent to an amplifier
using tubes. Period.

So, bottom line, unless you are willing to assume the cost of repairs that
might be necessary due to overdriving a THP amplifier, one should not
advise to ignore the manufacturers' instructions.

73,

Bob W5OV
Array Solutions
Tokyo Hy-Power Dealer &
THP Factory Warranty Service Center

> On Fri, 02 Jul 2010 10:00:19 -0700, Lyle Johnson <kk7p at wavecable.com>
> wrote:
>
> The K3 does have ALC output, but you shouldn't use it.  Using ALC on
> any amplifier, with any rig will usually cause transmitted signal
> problems.
>
> Just tune the amp with the recommended drive and put it on standby
> when not using it (don't forget to reset the power if you turned it up
> after tuning).
>
> I use an Alpha 87A and have never used the ALC on it in the 7 years
> I've owned it.  Alpha recommends that it not be used.
>
>>
>>> I've purchased a preowned THP amplifier to use until the KPA500 is
>>> available.  The Amp calls for ALC.  Not having that
>>> ...
>>
>>In addition to setting the drive power to the level needed by the amp,
>>the K3* does* have ALC support.  It is covered in the manual under the
>>description for the ACC conenctor as well as a section headed "External
>>ALC."
>>
>>73,
>>
>>Lyle KK7P
>
> Tom Childers
> N5GE Antenna
> 4507 Branchview Drive
> Arlington, TX 76017
> 817-478-6200
> n5ge at n5ge.com
> http://www.n5ge.com
>
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