Posted by
Don Rasmussen on
Mar 16, 2009; 8:50pm
URL: http://elecraft.85.s1.nabble.com/Hot-K3-tp2487346p2488432.html
Evert - so I am among fine company. This justfies my mental state, either I am not at all crazy or I have found one soul to share my specific malady.
I am comparing K3 #272 and K3 #2308, and the latter K3 is the "hotter".
The both play so well, at first it was hard to decide which one was "affected". ;-)
My difference can be as much as 20db.
K3 #272 has the HAGC mod.
Either the calibration department at Elecraft is having some bad days, or an unknown variation in parts is causing this.
I hesistate to post issues to the email list without a conversation with Elecraft but in this case maybe we have stumble upon something they don't know.
Cheers,
Don
--- On Mon, 3/16/09, Evert Bakker (PA2KW) <
[hidden email]> wrote:
> From: Evert Bakker (PA2KW) <
[hidden email]>
> Subject: RE: [Elecraft] "Hot" K3
> To: "'Don Rasmussen'" <
[hidden email]>
> Cc: "'Elecraft Discussion List'" <
[hidden email]>
> Date: Monday, March 16, 2009, 11:57 AM
> Hello Don,
>
> I do have a similar effect except that my first and second
> radio is a K3
> (SN-0812 and SN-2185).
>
> - Same power-supply at the same time radio's ON
> - both on 50 Ohm dummy load
> - same roofing filter (2.7 Kc)
> - same filter gain (0 dB)
> - same DSP setting (Bw = 3.0 Kc / Fctr = 1.5 Kc)
> - same rx equilizers
> - same AGC settings (AGC-F, THR=6, SLP=5)
> - no S-meter changes (settings are factory default)
> - same RF gain setting
> - KRX disabled in SN-2185
> - Both KANT 3 disabled and ANT 1 selected
>
> Result : 2 to 3 S-units difference (+/- 15 dB) on
> "internal" noise
> difference. This was the first test on 15 meter)
>
> That's a lot. How come?
>
> I can't say anything yet about the sensitivity. I will
> try to find someone
> with a "calibrated" signal source and make
> conclusions.
>
> It might all be differences in gain, but first of all I
> have to gain
> confidence...
>
> Has one of you a good suggestion a-priori?
>
> 73's, Evert PA2KW
>
>
>
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