Topband: Reactance problem

[Herb Schoenbohm]

Another suggestion is to run the same test after local sunset.  Most of the AM stations in the country have a much lower night time power and are required to switch to that after local sunset.
Some stations may, by virtue of using a large directional antenna array get FCC approval for a daytime power of 50KW but are required to switch to as low as 500 watts at local sunset.  Give it a try and you might find that BC overload can be impacting your readings.


Herb Schoenbohm, (ex-KV4FZ)

W2pm@aol.com wrote:

> I don't suggest this is the issue here but I have found after extensive work with it that the MFJ259B is quite sensitive to BC band and/or any other "strong RF" coming in off the antenna in question. I do not live particularly close to BC stations but was getting strange and inexplicable readings on my Inv L and other topband antennas. Then I bought the tunable filter device they sell and all readings fell into expected or likely boundaries.
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