[Elecraft] K3 S-meter on sub-Rx

[Edward R. Cole]

Thanks to K2AV and G0AFH for how to get the sub-Rx s-meter 
readings.  Also advice on RF gain Calib. on both Rx.

This was just a preliminary set up to get things close for a starting point.

As it turns out I got the two Rx within 1/2 s-unit of equal using 
ambient noise: Main Rx (Vpol) = S7; sub-Rx (H-pol) = S6
And that can be a difference in noise polarization at the antenna.

I will have to do a very thorough RF calibration with all components 
connected in the system for getting the dual-polarity diversity 
system set up properly.  This includes preamp gains, cable losses, K3 
IF gain variation, LP-Pan variation and soundcard levels.  Both 
channels need to be made equal in amplitude using a single signal 
source. Only then will the Linrad sw indicate polarity angle accurately.

See more of what I am doing:


73, Ed

At 06:00 AM 3/30/2011, Guy Olinger K2AV wrote:
>While tuned into a signal on the Sub RX, do a hold on BSET.  This will
>give you the S meter reading for the Sub RX tuned to the frequency in
>VFO B.  This is also how you do other Sub RX settings, such as
>ATT/PRE.  See page 37 in the manual, available in PDF format on the
>Elecraft site.
>
>You should be sure that you did the (separate) RF gain calibration and
>S meter calibration for both main and Sub RX, before you set your
>Transverter RX feed levels.
>
>73, Guy.
>
>On Wed, Mar 30, 2011 at 5:05 AM, Edward R. Cole <kl7uw at acsalaska.net> wrote:
> > I am installing a new 2m transverter to my K3 and ran into an issue
> > with the s-meter on the K3.
> >
> > The transverter has two Rx circuits so both the main and sub-Rx in
> > the K3 are fed with converted 2m signal.  I was adjusting the IF gain
> > in the transverter so that the noise level would read S2-S3 on the
> > K3.  These are two separate gain pots one controlling the input to
> > KVX3 Rx input and the other the aux input.
> >
> > All that was going well, but I discovered that the s-meter only
> > indicates signals from the main-Rx.  I have the sub-Rx input coming
> > from the  aux antenna and not being fed from ANT1.  I can hear the
> > change in noise level in the sub-Rx when I connect/disconnect to the
> > aux antennas jack, but it is not showing up on the s-meter when the
> > sub Rx is selected.  I discovered this after a lot of confusion,
> > thinking I had a problem in the sub-Rx.
> >
> > Is this normal (no s-meter reading from the sub-Rx?).  It is not
> > really a big issue as I can adjust the level by looking at my two
> > LP-Pan displays.  Just very surprised by the lack of s-meter function
> > on the sub-Rx.  I wonder if this is an issue when running in
> > transverter mode (CONFIG: XVN ON)?
> >
> >
> > 73, Ed - KL7UW, WD2XSH/45
> > ======================================
> > BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
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73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter?
DUBUS Magazine USA Rep dubususa at hotmail.com
======================================