I did buy it new, also when I put my 991a on it and set power down it seems to be fairly accurate with what power I¡¯m putting into it.?
Granted it¡¯s not certified but just one step I was trying in trouble shooting.?
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On Feb 1, 2024, at 10:16?AM, Jim Strohm <jim.strohm@...> wrote:
?
Did you buy that MFJ meter new?? If not, then somebody may have opened it up and got to it with the old golden screwdriver. ? IIRC, most of that kind of meter have a variable resistor for adjusting the meter into something approaching calibration -- or turning it to show maximum power.
The ?cheapest CB power meters had a fixed resistor that?was selected by testing the meter in the factory.
It's not that these adjustable power meters are bad.? In fact, some of them are very nice for QRP use, and can be tweaked to reasonable accuracy as long as you have a calibrated power meter that covers the same range as the cheapo, and a reliable power?source -- like a 27 MHz CB. ?
Among the reasons that 73 magazine printed nearly 80 articles for converting CB radios for the ham bands was that they were?cheap and reliable rigs.? Eventually I'll gather up all my old CBs and test them, so I can fix or convert them for 10M.
And if they have a built-in power meter, I'll adjust it so when it says 5 watts, that's what the radio is actually putting out.
73
Jim N6OTQ ?
The meter I¡¯m using is mighty fine junk, (mfj)?
Manual tuner with meter. I¡¯m not using the tuner as the end fed sloper I¡¯m using is giving a good match.?
I¡¯ll grab some picture of it with the various power supplies.?
What is everyone else using to power a 12volt qdx? Or what¡¯s the recommended way to power it??
Thanks?
?
It's a Dosy CB power meter ... the best money-maker that CB techs ever had.
Remember that if your power meter isn't calibrated, but is linear relative to the displayed power, it's still a useful tool.? It just isn't useful for exactlywatt?readings.? For that, you need something that IS calibrated, or at least can be calibrated.
73
Jim N6OTQ
On Thu, Feb 1, 2024 at 10:24?AM Alan G4ZFQ <
alan4alan@...> wrote:
On 01/02/2024 16:08, Bruce Akhurst wrote:
> I think you must be short of some decimal places somewhere ???
Or some useless power meters.
Alan
