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

Subject: Re: [Amps] Slow start-up of Amps on CW
From: Robert W5AJ <>
Date: Tue, 12 Mar 2024 14:39:17 -0500
List-post: <>

Future update with more recent Yaesu rigs??


On Tue, Mar 12, 2024, 2:30 PM Jim Brown <> wrote:

> On 3/12/2024 12:07 PM, Steve Harrison wrote:
> > I would definitely consider FT-991As,
> Yaesu radios have long had problems with bandwidth on both CW and SSB,
> producing clicks and splatter that are much wider than rigs from
> Kenwood, Elecraft, and Flex. See this link, which is my analysis of ARRL
> Labs data of popular rigs on CW. It was done with their blessing -- they
> sent me the electronic output of their measurements.
> In following years, I've traced SSB signals with wildly excessive
> splatter to Yaesu rigs. Splatter extends 2.5 kHz on both sides of the
> signal (that is, in the suppressed sideband, and on the other side of
> the active sideband) only 20 dB. W4TV traced the cause to the way Yaesu
> is doing signal processing in the transmit chain, and there are no user
> adjustments to fix it.
> This can be heard any time with ragchewers in the SSB bands, and clearly
> seen on good spectrum and waterfall displays that can get narrow, like
> the Elecraft P3. Clean signals show up on the waterfall as vertical bars
> with bandwidth of 2.5-2.8 kHz; these dirty signals show horizontal
> shoots from both sides of the bar on voice peaks.
> 73, Jim K9YC
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