[Elecraft] FW: K3: Use VFO-B to select dBV

[Cady, Fred]

I forgot to hit reply all.  

-----Original Message-----
From: Cady, Fred 
Sent: Friday, March 15, 2013 7:24 AM
To: 'KD7YZ Bob'
Subject: RE: [Elecraft] K3: Use VFO-B to select dBV

Hi Bob,
I'm not at my  book on that topic but from memory here goes:
The dBv measurement is really great once you catch on to how it works.
Note that dBV is NOT dB relative to a volt. It is relative to the last
time you made the AFV voltage measurement.
I think Tech Mode needs to be on. It used to, but maybe a firmware
update made it available.
Plug in the GO to get a solid signal at, say -73 dBm.
So, get the VFO B display in the right state and then turn VFO B to show
the AFV display.
Wait until the AFV display settles on a value. Now rotate VFO B to dBV.
It should settle to 0.0 dBV. Now, WITHOUT changing the VFO B, make a
change in the input conditions. E.G, change the XG3 to -107 dBm. You
should see the dbV display change to show the decrease in signal
strength. If you have AGC on, you probably won't see -34 dBV.
The trick to all this is once you set up for 0 dBV, DON'T change the VFO
B back to the AFV display.

Cheers,
Fred KE7X

"The Elecraft K3: Design, Configuration and Operation Second Edition"
www.ke7x.com

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of KD7YZ Bob
Sent: Friday, March 15, 2013 6:46 AM
To: K3 List
Subject: Re: [Elecraft] K3: Use VFO-B to select dBV


On Friday Gregory used a Straight-Key to send:
-------------Original Comment-------
> Have you got Menu Tech Mode ON?

Well, gee. Yes, I did have it on.  Really. But now it is "OFF". So I
will guess that the selection is not Persistent. Or that setting has
another way of reverting to OFF.

Not I am seeing 99.9dBV for an RMS reading of "1.09 A".
This isn't too helpful though.  Perhaps David can elaborate on how I get
to a meaningful reading.

thanks for the help.

--
Best regards,
Bob  KD7YZ    Win7-64bit + K3

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