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Re: [Amps] Acom 2000A Question

To: AB2E Darrell <>, Amps group <>
Subject: Re: [Amps] Acom 2000A Question
From: Herbert Schoenbohm <>
Date: Tue, 4 Jun 2019 17:26:47 -0300
List-post: <>
Darrel,  Thanks for the advice.  I was exchanging emails with Val at the
factory in Bulgaria.  The problem was traced to an external 1.5-KW 20 meter
filter that appears to be breaking down at about the 200-watt level. With
the exciter and the 4 element beam alone it shows a 1.1 to 1 VSWR.  But
when I ramped up the power the O/L kicked in.  Normal I would expect to see
the VSRW O/L come on.  That was not the case here.  I only got immediate
shutdown and the "reduce drive error"  message.

Thanks again for your help.

Herb, KV4FZ

On Tue, Jun 4, 2019 at 5:03 PM AB2E Darrell <> wrote:

> Offlist.
> Greetings Herb,
> OK, guess you already checked the obvious?
> What 20m antenna are you using, does it show low swr when you run barefoot
> without the amp?
> Did you do the optimize tuning on 20m for that antenna with the Autotune
> Enter function with 10-20W?
> How about a spare RCU in case it's a chip?
> Or maybe something local to the 20m circuit in the amp has gone.
> Do you know Krassy K1LZ up in MA?
> He was founder of Acom and still has a repair shop in MA. I think it is
> called Milana.
> I;'ll dig up the info but I think Krassy is listed in also.
> Array Solutions in TX probably still services them since they used to sell
> them.
> Just picked up my 2nd used Acom 2000A yesterday.
> Just optimized my 160m inverted L on a taller up and over a
> 100ft oak. Fed 10ft off ground with 5 tuned radials so far.
> Been checking 160 but nothing on here lately since near summer.
> 73 and all the best,
> Darrell AB2E  (V26E)
> ------------------------------
> *From:* Amps <> on behalf of Herbert
> Schoenbohm <>
> *Sent:* Monday, June 3, 2019 12:20 PM
> *To:* Amps group
> *Subject:* [Amps] Acom 2000A Question
> I have an Aocom 200A and like it very much.  However, I noticed an unusual
> problem that now occurs. The amplifier works well on all bands except 20
> meters. On 20 meters I get an error message with the warning to reduce
> power.  The unit malfunctions with any drive level; over 10 watts.  My load
> is 1.1 to 1.  Do you have any suggestions on how I can further check this
> problem?
> you have an email for the manufacturer in Bulgaria?
> Herb Schoenbohm, KV4FZ
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