>
>The PRO-67B I recently bought didn't work on any band, and it
>turns out about half the traps are very lossy. It isn't moisture,
>or any visible problem inside the traps. The only thing I can
>think of is that the plastic used to make some of the coil forms
>is lossy. In any case, I'm wondering if anyone else has heard of
>similar problems with recent Mosley traps? Unless I'm the only
>guy who bought an antenna from the in the past few months, it's
>hard to believe I'm the only one who got lossy traps.
>
>73,
>
>Scott K9MA
>
Sorry to read about your problems, Scott. I've had similar
problems with all 3 Mosley TA53Ms that I've installed. I was able
to get them to work, but not with any help from Mosley.
At first all 3 did not resonate correctly on 1 or more bands.
After rechecking dimensions, I decided to disassemble the traps as
several had rattles in them. These were found to have metal
filings in them. All of them were full of 'grease', which was
impregnated with filings. (This might explain the blown/shorted
trap reported by another.) This 'grease' was on the coil forms and
wouldn't be noticed unless the traps were disassembled. After
cleaning them up and re-assembling the antenna, all bands, except
15m worked, as expected. I suspect the high VSWR on 15m may be due
to the 6m beam (boom is 1/4 wavelengths long on 15m) mounted above
the TA53M.
The other problem that I've run into is mislabelled traps. If
the traps are installed backwards, they will appear very lossy.
Unfortunately, the Mosley manuals do not indicate the number of
turns used in each coil (there are actually 2 coils in each trap).
I found Mosley a pain to deal with. They don't answer written
correspondence and no one ever seems to be in when you call on the
telephone. I've never had them return a phone call on their
nickel.
Good Luck
Steve WA8LLY/6
|