[Lowfer] Looking for input on measuring changes to the beacon
N8OOU
n8oou at meekfarm.us
Mon Feb 2 09:26:59 EST 2015
I have been trying to develop a way to measure gains or losses in the
changes I make over time, to the Wm Beacon. Being a genuine cheapskate
I am trying to use just the equipment I have at hand. I have come up
with this idea.
My equipment includes the Kenwood TS-480 interfaced to the computer with
argo and other common software. I also have a Kay model 432d attenuator
which I believe to be accurate. I can use either a multiband trap
vertical (80m - 10m) or a pa0rdt mini whip, both mounted about 100 ft.
away from the beacon antenna.
The Kenwood has a digital rf gain control which steps from 100, down to
0. As the numbers go down the s-meter bars go up. I assume the
incoming signal must be stronger than the indicated bars to be heard.
At 36 the s-meter is full scale at 60dB over 9. As you go lower in
numbers the sensitivity continues to be reduced with no change on the
s-meter. I am currently measuring in the 22 range, and have not yet
needed to put the attenuator in-line.
With argo set to display the beacon in the band mode screen it indicates
the peak signal frequency and strength in dB at the top of the screen.
As I drop the rf gain, I hit a point where argo loses the beacon lock
and seems to hunt for a signal to lock onto. If I raise the gain back up
argo seems to lock back on to the beacon again. That rf gain setting /
argo reaction, seems to be reliable and consistent.
What is the opinion to logging the gain setting / argo signal strength
reading to benchmark changes to the beacon system? Any thoughts about
consistency over the long term? Is there a flaw I am missing?
--
73 de N8OOU - Mike Meek
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