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Re: [Amps] Slow start-up of Amps on CW

To: Paul Christensen <>
Subject: Re: [Amps] Slow start-up of Amps on CW
From: MU 4CX250B <>
Date: Tue, 12 Mar 2024 17:16:41 +0000
List-post: <>
Good advice, Paul. Tnx!
Jim w8zr
Sent from my iPhone

> On Mar 12, 2024, at 10:52 AM, Paul Christensen <> wrote:
> Although the IC-7300 is probably not at the top of a contester's wish list,
> it truncates the trailing RF edge in all modes when used with an amplifier.
> The 7300's RF Delay setting is useful for correcting leading edge
> hot-switching but it does nothing to correct the release of the amplifier
> SEND line before RF decays to zero.  Icom refuses to acknowledge the
> problem.
> What's perplexing to me is an almost rabid desire to own the most accurate
> wattmeter but ops won't spend a fraction of that expense on an inexpensive
> oscilloscope to monitor hot-switching effects.  It doesn't even take an
> expensive RF sampler: often coupling turns of a wire around the amp's output
> coax is enough to at least give an accurate representation of what's being
> sent to the antenna.  Monitoring RF this way will assist in saving RF relays
> from contact failure and eliminate CW key clicks.
> Paul, W9AC
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