I was going to recommend what Don says with a twist. (BTW, it's page 38 in the
K3S manual)
To get a normalized noise reading, terminate the RX antenna connector, select it
and let the AFV value stabilize. Then select the normal antenna and the dBV
display. This will display the ratio of external noise to a 50 Ohm
termination. Mode and BW will have some effect but as long as they are constant
you will get good info. Of course, all of this assumes no signals in the passband.
Wes N7WS
On 8/1/2017 7:58 AM, Don Wilhelm wrote:
Dave,
You can use the Alternate VFO B display of AFV to give better resolution than
the S-meter. See page 36 of the K3 manual. You must have the CONFIG: TECH
MODE turned on to show the AFV entry.
If you want to see the difference between two values, there is also the DBV
alternate VFO B display which will show the difference in dB between 2 noise
or signal settings.
73,
Don W3FPR
On 8/1/2017 10:17 AM, Dave Sublette wrote:
I currently live in a townhouse and have made an offer on a few acres in a
more rural area. I would like to measure the relative noise levels between
the two locations to reduce the probability of surprises or disappointments
should I close the deal. I have gotten access to a very good battery
powered spectrum analyzer and plan to use a tripod-mounted 6 foot whip and a
20 dB LNA to measure the noise levels at each location.
While setting this up, I though it would be interesting to try to also use
the K3 to measure noise with the same antenna (but without the LNA). I've
written a Python script to control the K3 as it steps through each band and
records S meter levels.
I'm looking for recommendations on K3 settings for this purpose. Specific
questions I have are:
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