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Re: SO-239 standards for HF Band-pass filter work?

 

Hi Neal,

I use the nanoVNA for the same things.
Sma-to-PL259 works just fine to tune the filters for passband, S21 (loss)? and S11 (swr).
The 50MHz and HF measurements this way are accurate enough.

73
Arie PA3A

Op 25-2-2020 om 01:13 schreef Neal Pollack:

Hi:

I am going to build some HF bandpass filters, in the range 1Mhz to 54Mhz.
Since most standalone filters are fitted with SO-239 sockets, I would use
reasonable quality SMA to PL-259 male cables, and want an SO-239 calibration
socket set.

What are people using for this type of work on HF ham gear? At these low
frequencies, it seems like the amount of effort in the following document:

might be overkill? Have people found simpler (less work) methods to get
adequate results for tuning a bandpass filter at frequencies less than 50Mhz?
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