[Lowfer] [WARNING: A/V UNSCANNABLE]Re: MFJ-249 Antenna Analyser Mod.

[Cliff Sojourner]

(replying to some old threads, I move slowly.  QRSS of the body ;^/

On 2015-11-27 22:22, KD7JYK DM09 wrote:
> : yeah my 249 is sort of fussy too, in a way that my 269 is not.  I just
> : figured it's the crummy SO-239 with a phenolic insulator.
>
> Are you having problems with the meter jumping and holding at odd places?

the SWR needle would waver up and down.  but only down in the salt flats 
by SF Bay.  I think it's AM BCB overload.  doesn't happen up in the 
hills, away from that.

>
> I found two sources of that.  One, static on the screen, I thought of
> covering mine with metal mesh.  Haven't gone beyond thinking about it, but
> wiping the unit down helped.
>
> The BIGGEST problem which caused erratic readings, is, of all things, DUST
> between the cabinet halves and in the screw threads.

that's a good one!  gave it a close inspection and clean-up.  so far so 
good.

thanks, Kurt

> It took a while to
> figure that one out by noticing the erratic behavior coincided with holding
> the case certain ways or squeezing it.  Thorough cleaning and the mating
> surfaces and carefully blowing out the threaded holes and blowing off the
> screws fixed that.
>
> I've had no problems with the connector and after the above fixes, the unit
> is very stable and functional.  Over-all, I am quite pleased with the unit.
> The high-quality silver-Teflon connector is a good idea.  Might look for
> space for a parallel BNC as well.
>
> Kurt
>
>