[TowerTalk] Xm 240

[Lux, Jim]

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.