I've independently measured the linear range of the DBV function as just
over 60 dB, which is quite impressive. You can see the plot at
http://www.cliftonlaboratories.com/elecraft_k3_noise_blanker_and_crystal_dsp_filtering.htm.
That page also provides measured filter response curves using the K3's
DBV function.
DBV is a very useful tool and a tip of the hat to the lads at Elecraft
for including it. (lasses as well as lads, if appropriate.)
Jack K8ZOA
www.cliftonlaboratories.com
Eric Swartz WA6HHQ - Elecraft wrote:
Hi Brian,
The dBV and AFV functions were designed primarily for use with steady
state lab signals to test receiver sensitivity etc. We added these two
displays to speed our final test of the K3 in production, and as an
aid to do this in the field with simple tools like our XG2 test
oscillator. They were not intended for dynamic signal, off the air
measurements.
73, Eric WA6HHQ
---
_..._
alsopb wrote:
Apparently I need some help in trying to use this dBV capability with
on the
air signals.
For example, using it as an AGC off "relative" S-meter with digital
readout
to run some antenna pattern checks for skewness etc.
I've used it just fine in "lab type" measurements with a constant signal
source.
First question. What is meant by stable value of AFV?
Here's what I see for a bunch of AFV edited values one after another
with no
change in K3 settings.
1579,1688,1598,1624,1696,1613, 2168,1758,1425.
The range is 6db.
Is the reference value of AFV used in the dbV calculation the last
one taken
at the instant one leaves the menu entry? Yes, it doesn't really
matter if
that values is used forever.
Suppose one then takes a series of dbV measurements, is the
reference AFV
ever changed during the set of readings?
The integration times available are 500 and 1000 ms. It would seem that
longer integration times are required for off air type measurements.
Is there any integration time in the measured voltage used in the dBV
calculation? Or is it nearly an instantaneous value? For off the
air type
measurements, it would seem that a suitably long value is needed.
73 de Brian/K3KO
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