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

To: "" <>, Pete Smith N4ZR <>
Subject: Re: [Amps] Slow start-up of Amps on CW
From: "Jeff in Mali: via Amps" <>
Reply-to: "Jeff in Mali:" <>
Date: Wed, 13 Mar 2024 02:19:34 +0000 (UTC)
List-post: <>
 Thanks Pete, I'll check that my settings are right. 
    On Wednesday, March 13, 2024 at 01:25:30 AM GMT, Pete Smith N4ZR 
<> wrote:  
 I think this thread is drifting off-topic.  We're not talking about the 
waveform of CW, but how long it takes after PTT before the KPA-1500 is 
ready to amplify incoming signals.  I've been there - at first my N was 
getting trimmed into a non-character, so I now have a 50 ms. delay in my 
Winkeyer (which controls PTT) to prevent that.

73, Pete N4ZR

On 3/12/2024 7:52 PM, Jim Brown wrote:
> On 3/12/2024 2:40 PM, Robert W5AJ wrote:
>> Best I can tell, FTdx10 CW with 6ms rise time is in par with K3 
>> looking at QST In Depth review
> Fast rise time CAUSES clicks; beginning with the first K3, Elecraft 
> uses a carefully shaped keying waveform that they call "sigmoidal," 
> (which I've heard described as a raised cosine) to provide nice sharp 
> keying without clicks. I've heard that after a bad ARRL review for for 
> their 6500 series rigs, they adopted that shaping or something like it.
> But rise time is the wrong thing to measure -- a spectral plot showing 
> sidebands with a string of dits shows where the bodies are buried.
> Likewise, modulation with a sine wave, or even an IMD pair of sine 
> waves, fails to expose splatter caused by processing like Yaesu is 
> (was?) doing in those rigs.
> Splatter running VHF/UHF rover is far less likely to cause QRM except 
> during band openings on SSB.
> FWIW -- I love my K4, but am still quite happy with my 2008-vintage K3 
> with upgraded synth.
> 73, Jim K9YC
>> It is interesting to watch the CW signals now with the BandScope
>> more so during CW contest!
>> Still own the K3 but I'm not likely to sport (Buy) a K4
>> The FTdx10 is ideal rig to carry on the 50Mhz rover trips, gets me 
>> band scope & built in sound card
>> 73 Robert W5AJ
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