[Elecraft] K3/100 TX problem on 20m
Masadaman
masadaman at yahoo.com
Tue Mar 5 18:42:27 EST 2024
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On Tue, Mar 5, 2024 at 11:29 AM, Michael Carter via Elecraft<elecraft at mailman.qth.net> wrote: Hi Hal,
The numbers themselves have meaning to the
DACs inside the K3, but in terms of actual
units I don't know. The key thing is that as
those values are increased, the drive levels
from the TX DACs are increased, though I
don't know if the relationship is a linear one.
The gains of the LPA and PA stage transistors
fall off at higher frequencies, so one might
expect TX Gain parameters on those bands
to be somewhat higher than on the low bands.
However, if two immediately adjacent bands
have very different TX gain parameter values,
the likelihood is that something is amiss
in one of the filters (either BPF or LPF) and
the associated relays that select the filters.
73,
Mike, K8CN
________________________________
From: dyno lab <dynolab at comcast.net>
Sent: Tuesday, March 5, 2024 11:19 AM
To: Michael Carter <Mike.Carter at unh.edu>; Michael Carter via Elecraft <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] K3/100 TX problem on 20m
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Do the TX gain parameter numbers have meaning such as dB or are they just relative numbers ?
73,
Hal
W7YNC
> On 03/05/2024 6:35 AM PST Michael Carter via Elecraft <elecraft at mailman.qth.net> wrote:
>
>
> Hi Paul,
>
> Could you please post the TX gain parameters
> recorded by the K3 Utility at the 50 watt level
> for all bands?
>
> If there is a significant difference in those gain
> parameter values between adjacent bands (say
> 30 and 17 meters) and the value on the 20
> meter band, that may be an additional clue.
>
> The bandpass filter bank may be at issue here
> since you've checked the appropriate LPF.
> If there's a problem with the relay contacts
> on the relevant BPF or LPF section, that may
> also reduce the TX signal level and force
> an elevated TX Gain parameter value for that
> band.
>
> Keith, WE6R has a checklist of steps to
> try when diagnosing low TX output power.
> I recall he said to contact support at elecraft.com
> for that document.
>
> 73,
> Mike, K8CN
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