Yes - although there have also been some analysis done that seems to
show that, in FT8, with any ALC bars visible, signals begin to widen
out, and at 4 bars there is a lot of junk between signals. Just
repeating what I've been told - I don't have the ability to check this
myself.
I was running FT8 just below 1 bar, and found the driving power to my
amp took 7 or 8 transmit periods to get to full power each time I
adjusted my power, even by a tenth of a watt. I'm now running 3 bars
(third flickering) and power-up behavior is much better.
73, Pete N4ZR
On 4/6/2024 3:33 PM, W3FPR wrote:
According to the DSP software engineer (Lyle Johnson) ALC begins at
the 5th bar, and with the 5th bsr flickering shows no ALC action - 5th
on solid, it does show some ALC.
To keep the audio drive for digital modes correct set so the 5th bar
just flickers. Less than that the audio drive will ramp up and
produce "power hunting" at the output. More than that, you will go
into distortion (ALC Compression) which will not produce the cleanest
signal.
The Fred Cady books also agree on that.
73,
Don W3FPR
On 4/6/2024 3:03 PM, Fred Jensen wrote:
Hmmm ... I thought that the ALC started AT the 5th bar and the first
4 bars were sort of a VU-meter. Hence Don's occasional advice, "4
full bars and the 5th occasionally flickering." I've been known to
get things wrong in the past however.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Bob McGraw wrote on 4/6/2024 8:50 AM:
Just to be clear on the point. The correct audio level should
produce 4 bars indicated on the ALC Scale. Actual ALC action does
not start until after the 5th bar.
Yes, after any power adjustment, the audio system does start at
lower gain, quickly ramping to the desired level. This is done to
prevent any potential power overshoot. After the initial
transmission at the new power setting, the remainder of
transmissions are at the proper power level setting.
73
Bob, K4TAX
On 4/5/2024 5:50 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 14
Date: Thu, 4 Apr 2024 21:03:20 -0400
From: Pete Smith N4ZR<pete.n...@gmail.com>
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Weird K-3 Power Behavior
Message-ID:<59c02b5d-1800-4a78-9d73-60461d231...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
I just set the audio to be sure I'm? hitting 4 bars of ALC,and the
cycle
of adjust K-3 power to full expected drive to the KPA-1500 is now more
like CW, but the question remains -? after I adjust the power a tiny
fraction in either direction, why does the K-3's output power drop way
back and relatively slowly recover?
73, Pete N4ZR
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