[Elecraft] [K3] Sub RX S-meter cal

[Mike Harris]

G'day,

My results are:

Source - XG1, RX gain calibration per the utility routine:

Subsequently:

Main RX only, pre amp OFF  - 50uV (S9), 1uV (S2)

Sub-RX ON therefore splitter loss:

Main RX S8 & S1
Sub-RX  S7 & S0

No big deal but not identical.

As a matter of interest, the S-meter on the main RX had been set up 
a year ago or more as above.  When I checked it before doing the RX 
gain calibration I discovered that the 1uV and 50uV figures were S5 
& S9.  Little wonder I thought the local noise level had been 
creeping up!  Maybe after playing with the AGC parameters a re-cal 
of the S-meter is required, maybe not, but something altered it.  I 
assume that given the 50uV S9 setting was correct then it isn't 
associated with the XG1.

Regards,

Mike VP8NO


----- Original Message ----- 
From: "Ken K3IU" <kenk3iu at cox.net>
To: "N1JM" <johnn1jm at gmail.com>
Cc: <elecraft at mailman.qth.net>
Sent: Wednesday, October 07, 2009 12:22 PM
Subject: Re: [Elecraft] [K3] Sub RX S-meter cal


> The S-meter Cal procedure in the manual worked up until about 
> v.3.15 or
> so. Now I am pretty sure that it was NOT separately adjusting the 
> SubRx
> S-meter, but I never checked, so I'm not sure. It doesn't really 
> matter now.
>
> I have determined that, at least on my K3 (#202) running v3.41 et 
> al,
> after running the RF Gain Calibration procedure and setting the 
> MAIN Rx
> S-meter, the Sub Rx S-meter is spot on. It actually follows the
> adjustment for the Main Rx S-meter, i.e., set Main Rx at an 
> extreme and
> the Sub Rx shows the exact same extreme.
>
> So... it looks to me like there is no reason to have a separate
> adjustment for the SubRx S-meter. I'm sure the manual will catch 
> up.
>
> 73,
> Ken K3IU