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Re: [Amps] 3CX3000A7 on 144 MHz

Subject: Re: [Amps] 3CX3000A7 on 144 MHz
From: Jim <>
Date: Sun, 9 Feb 2020 06:42:54 -0600
List-post: <>
I would be afraid that the switching pulses would show up on the air, or produce inter mod products every 50 or 100 KHz (or whatever the switching frequency is)

Jim W7RY

On 2/7/2020 6:05 PM, Jim Brown wrote:
On 2/7/2020 3:54 PM, Jim Garland wrote:
One might mention that the switcher needs to have a floating 7.5V output, so it doesn't provide a ground reference for the filaments.

Yes. BUT -- given that switchers are notorious for RF noise, I'd be seriously cautious about selection of one that's quiet. We all know it's POSSIBLE to build quiet ones -- the ones that Elecraft and Expert are using with their amps seem to be pretty quiet.

73, Jim K9YC

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