Re: Inexpensive fairly good quality home brew or kit RF power meter

On Apr 18, 11:26 pm, bz <bz+...@xxxxxxxxxxxxxxxxxxxx> wrote:
"captainvideo462...@xxxxxxxxx" <captainvideo462...@xxxxxxxxx> wrote innews:a0af529a-e358-4577-be1a-dd107caa9e25@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:

I have a need for a power meter for general low band and VHF work. I
would like it to have at least two scales. One,  a 0 - 10 W or so
scale and if possible another which would enable it to measure up to
around 125 W as well. The immediate need to satisfy the requirements
of a job we're doing is for an instrument that can measure 1.0 W at
72.0 MHZ. The signal is AM with a duration of .50 sec. and there is
some type of digital alarm transmission which modulates the carrier.
The only way I think that I can do this now is to measure the RMS
voltage accross a 52 ohm dummy load with my Boonton, and then
calculate the power. I feel though that this is clumsy and may be
potentially inaccurate. I'd love to have a Bird with all the bells and
whistles but I really can't afford one. Does anyone know of a home
brew project for doing this or even an inexpensive accurate kit?
Thanks, Lenny.

http://www.elecraft.com/mini_module_kits/mini_modules.htm

--
bz      73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

bz+...@xxxxxxxxxxxxxxxxxxxx   remove ch100-5 to avoid spam trap

..

The signal is AM with a duration of .50 sec. and there is
some type of digital alarm transmission which modulates the carrier

That sounds like a complex transmission , measuring the incident
voltage over the 50 ohm load may be the only way , may be hire
something expensive to get a calibration chart ?

G .

.