Richard,

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

Here is something else you could do. Connect a 50 Ohm, or so resistor from
the MFJ to the cable. Then a diode (1N914, etc) from that junction to a DC
voltmeter. Now adjust the frequency for minimum DC voltage. You may have to
interpolate between the two points where the meter goes to 0. If it tunes
too broadly, make the resistor 0. I have done this with a 'scope, but not a
voltmeter,

Tam/WB2TT

"Richard" wrote in message
om...
What would be the best way to adjust a quarter wave of 75 Ohm twin
line using an antenna analyser? I just connected mine across the
analyser (open circuit) and looked for the freq where a short showed -
is that likely to be accurate? At 10.1 MHZ I ended up with a 15.7 foot
line which seems a bit short (low velocity factor).

73

Richard
G3CWI