On Mar 22, 1:00*am, (David Griffith) wrote:
K7ITM wrote:
On Mar 21, 3:35*pm, (David Griffith) wrote:
I'd like to modify an Arrow OSJ 146/440 to use an N connector instead of
SO239. *This would require an N-to-3/8"-24 stud. *Allen Lowe hasn't
heard of such a thing, which is why he doesn't offer that antenna with
an N-connector. *Does anyone here know if such a beast exists? *What
would it take to have some of these custom made?
I'm a bit confused about what, exactly, you want... *is it something
to go from an N connector "chassis mount" socket's center pin to a
3/8-24 stud? *Or some sort of adapter to go between the N series
5/8"-24 thread and a 3/8"-24 thread? *A picture would probably be
worth lots of words...

See Ebay item number 380322578383. *This device connects the center
conductor of an SO239 to a 3/8"-24 bolt upon which a tall nut is
screwed. *To use it, you stick it up through a piece of metal (say, a
bracket), put an insulating washer on that, add the tall nut, then put a
whip adapter in the nut. *I want something like that for an N-connector.. *

--
David Griffith
* --- Put my last name where it belongs

Ah, OK...what the ebay picture looks like to me is an UHF socket whose
"rear" pin becomes a male 3/8-24, so a 3/8-24 coupling nut ("long
nut") can go over it to clamp the insulating washers to the bracket.
The problem I see with that is you couldn't just make a simple 3/8-24
stud and solder it to an N center pin, and expect it would hold up
very well with the tension on the solder joint. It would be pretty
trivial to make on a lathe I'd be happy to do it, but you probably
wouldn't like the price for one. They'd be cheap (relatively) if you
wanted 10,000 of them. ;-) Then you also need the insulating
washers--maybe you get those from the existing antenna? If what I
described in the first sentence is what you're looking for, check CB
stores for a 3/8-24 to 1/8" whip adapter...

Seems like a better mechanical arrangement would be to have the whip
attached securely to the mounting bracket, and the N connector also
securely attached to the mounting bracket, arranged to there's
relatively little strain on the center pin of the N connector...

If an SO239 to N adapter works, MPJA has them for about a third the
price of Allied... see MPJA # 0522-RC.

Cheers,
Tom