[Elecraft] K3 and Expert 1K-FA

[Bob Naumann]

Before this faulty opinion proliferates any further; what applies to tube amps does not follow with solid state amps.

ALC is required by most manufacturers of solid state amps to prevent overdriving and the resulting damage to the amplifier. ALC is the mechanism used to achieve this protection.

We were the original USA importer of the Expert 1KFA and it requires ALC. Tokyo Hy-Power does as well.

Can you manually limit your output from your radio and avoid damage? Yes. Even so, why take the risk? Hook up the ALC and adjust it according to the amplifier manufacturer's instruction.

If it is not working correctly, refer the problem to the amplifier manufacturer or dealer.

So, please do not advise someone with a solid state amp to disconnect their ALC- unless you want to assume the cost of repairs.

73,

Bob W5OV
Array Solutions
(Tokyo Hy-Power Dealer)

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Philippe Trottet
Sent: Wednesday, April 21, 2010 2:52 AM
To: Franco Cazzaniga; Arie Kleingeld PA3A
Cc: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 and Expert 1K-FA

Hi Franco,
Fully agree Arie's comments, I'm not using an auto Amp. only a manual
one with a Russian tetrode, and only checked on the K3 that the time
delay corresponds to the amp specs and that's all. 
With my K3-100, most of the time I'm driving it with 12W and the output
with my amp is ±350W thats cover most of my applications.  At 13W it
engage the KPA100 for higher power needs.
Just set the K3 to the power level you want to use without going over
the specs of your equipment.
 
Bst 73's
Philippe A65BI

>>> "Arie Kleingeld PA3A" <pa3a at xs4all.nl> 21-04-2010 11:25 >>>
Franco,

Forget about the ALC.
Up till now I have never used the ALC between my TRX and PA. No need
to.
Just gently set the power of the trx yourself to drive the PA to the
right powerlevel and go.

73
Arie PA3A

-----Oorspronkelijk bericht-----

Hello
I  use the Expert 1K-FA  with K3 full power and ALC , but i think i
have
two issue.
When i use K3 full power ( with Expert full power ) the rig output  is
not  stable but fluctuates around 15 watt and more or less of 5 watt ,
and of course the output of Expert varies consequently .
When i use Expert half power i have not issue , the input and output
power are stable.
Another issue is that when i put the Expert in STBY , the K3 output
power does not return instantly at 100 w , but slowly in 3 - 4
seconds.
When i not use the ALC i have not issue.
Thank you
Franco I6QFZ

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