Paul, it will depend on your specific model of meter. If it's the
kind that reads SWR directly & has a "cal" knob for the meter no mods
are needed, just set your meter the same as you would for a CB, the
SWR measurment will be right.

If it's the "forward & reverse power" variety there should be trim
pot adjustments inside the case to adjust the meter to read watts
correctly but you'll need to lay your hands on an accurate meter (Bird
43 w/correct slugs recommended) for that frequency range to compare
yours against. Just hook them in series & adjust yours to read the
same as the "good" one.

Just for comparison, I've got a 30 year old RS CB
power-modulation-vswr combo meter that reads pretty much correctly at
148 mhz, so if yours is off it probably won't be by much.

Have fun, don't let the smoke out .

Howard.

On 31 May 2004 22:31:31 -0700, (Paul Lee)
wrote:

I just posted a question on the RS SWR meter and the thread
dissapeared.

Here is my question again. Is there some way of modifying
the Radio Shack SWR meter (27MHZ) to make it work in the
aircraft radio range (120MHZ)?

I am not asking if I should use it or not but what circuit
modification can be done so it centers in the aircraft VHF
frequencies. SWR circuitry is usually simple and the RS
SWR meter already's got the meter and knobs. Anybody's
done that already?