[Elecraft] Re: Problems with K3 KXV3 IF Output Level?

Lyle Johnson kk7p at wavecable.com
Thu Jul 31 09:53:17 EDT 2008


> ...There is just no tracking of levels at the I F
> out with what is fed into the antenna input of the receiver.

If that were true, LP-PAN, SDR-14 and SDR0IQ could not be used as 
panadaptors.  But they can and are being used, so one can only conclude 
that the output at the IF jack most assuredly follows the signal at the 
input.

Note that there are a mulititude of signals at the IF output connector 
since this is the unfiltered output from the mixer post-amplifier. 
These signals must be accounted for in any device which attaches to the 
IF output jack.  See < URL:http://www.telepostinc.com/LP-PAN.html > and 
scroll about halfway down the page to "L.O. leakage / isolation:" for 
details

The lower the impedance of the attached load, the lower the gain (or 
increased loss) there will be at the IF output.  We're talking microvolt 
levels here, not hundreds of millivolts.

73,

Lyle KK7P



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