Tarmo Tammaru wrote:
Interesting situation. You are short by a couple of inches from what
one would expect. I wonder if you have to take into account the few
inches of line inside the meter. Does the manual say anything about
that?

Recent MFJ manuals recommend using an external coax T-adapter with a 50
ohm load on one arm, and looking for the dip in SWR reading
(short-circuited quarter-wave, or open-circuited half-wave). That does
not require accounting for any extra length inside the meter, only
inside the T-adapter itself.

You should certainly count the length of any connectors/adapters as
part of the line length.

Certainly. If you don't like math, then plan to install the resonant
line in the same way as you tested it, using a T-adapter.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek