On 11/27/22 8:37 AM, Grant Saviers wrote:
The MFJ259 is pretty useless in an RF environment. It has very poor
selectivity to overload. Found this tuning 40 and 80m verticals 4
miles from a BCB station.
Newer SWR meters are much more resistant, but still can be overloaded.
The alternative is to try 5 to 10w transmit, whatever makes the radio
swr or external meter read reliably and sweep the band.
Or get something like a NanoVNA, which has a narrow band receiver.
Although, I suppose you could saturate the mixer if you have a strong
enough signal. But you'll know it if that occurs, because the S11
magnitude will look pretty wonky (spikes where a harmonic of
interference happens to mix with a harmonic of the LO).
The NanoVNA H4 (with the 4" screen) is $80 from R&L.
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