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Re: [Amps] SCR to adjust 240v to 200v

Subject: Re: [Amps] SCR to adjust 240v to 200v
From: Michael Clarson <>
Date: Mon, 15 Aug 2016 12:12:53 -0400
List-post: <">>
Yes, Jim. The Motorolas were all VHF/UHF. They did make them to work as low
as 25 MHz, which was just barely HF. I never liked fixing those supplies.
Lightning was always taking out some of the semiconductors. I'm going to
try to find a manual and see exactly how they did it. --73, Mike, WV2ZOW

On Mon, Aug 15, 2016 at 11:34 AM, Jim Brown <>

> On Fri,8/12/2016 12:41 PM, Michael Clarson wrote:
>> All done at 60 Hz and never had any RFI
>> issues from these supplies.
> I'm sure that Motorola carefully designed so that there was no RFI at
> VHF/UHF. But this sort of circuitry is FAR more likely to generate trash at
> MF and HF. Bottom line -- it's not necessarily a slam dunk. By contrast,
> the boost/buck transformer IS a slam dunk, and guaranteed not to add noise.
> 73, Jim K9YC
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