[MFJ-Ameritron] MFJ-259B impedance reading

[Andy]

If you feel up to it, there are instructions online for calibrating your '259B.

They were written by antenna expert Tom Rauch, W8JI, who was the one
who designed the '259, on contract for MFJ.  I think he has it on his
website, so if you hunt around www.w8ji.com you should locate it.
Make sure you get his version, not one of the copies floating around
the 'net that are not completely correct.

You will need a few other resistor loads to do this, and I always have
my worries about that, though they may be unfounded.  It's easy to
cheaply throw together 25, 100, and 200 ohm test loads, and measure
them with a good DVM to be certain of their value, but how good are
they at RF?  If you do the calibration at a low enough frequency, it
is probably OK.

Regards,
Andy