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Old 30-04-2022, 13:31   #46
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Re: PL 259 coax connector

Conversations on CF are like sailing in rough seas: one can never stay on course and will always veer off in one direction of the other.

Gotta love it.
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Old 30-04-2022, 16:50   #47
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PL 259 coax connector

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Originally Posted by S/V Illusion View Post
A dipole, by definition, is a balanced antenna. An end-fed antenna is not a dipole. It is an end-fed antenna in which a counterpoise is used to offset the imbalance. In boating context, an end-fed is typically a random length backstay. Not a dipole.


Take a coax, strip back a 1/4 wave to expose the center conductor. Put a 1/4 wave choking section, open at the end, attached to the end of the feed coax shield. Voila! End fed dipole that reduces feedline radiation, and requires no ground plane. Feed with a PL259 that is crimped or soldered by a NASA qualified specialist. [emoji847]
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Old 30-04-2022, 17:38   #48
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Re: PL 259 coax connector

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Take a coax, strip back a 1/4 wave to expose the center conductor. Put a 1/4 wave choking section, open at the end, attached to the end of the feed coax shield. Voila! End fed dipole that reduces feedline radiation, and requires no ground plane. Feed with a PL259 that is crimped or soldered by a NASA qualified specialist. [emoji847]

Sleeve dipole.


Extra points if you can hold forth on impedance matching for it and the ideal ratio of the length of the sleeve to the length of the exposed center conductor (hint: not 1:1).
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Old 30-04-2022, 20:08   #49
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Re: PL 259 coax connector

S/V Illusion, now it HAS turned into a contest.
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Old 01-05-2022, 04:39   #50
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Re: PL 259 coax connector

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Sleeve dipole.


Extra points if you can hold forth on impedance matching for it and the ideal ratio of the length of the sleeve to the length of the exposed center conductor (hint: not 1:1).


Good one. I dont know. Maybe related to the velocity of propagation of the insulation?
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Old 01-05-2022, 14:21   #51
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Re: PL 259 coax connector

Me neither but I've seen some discussions go on and on about these details.


https://incompliancemag.com/article/...ign-and-build/


Usually the sleeve is a little shorter than the exposed center conductor. Something about the coupling with the coax.
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Old 01-05-2022, 15:57   #52
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Re: PL 259 coax connector

Thats a good mag, i get it monthly
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Old 02-05-2022, 07:34   #53
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Re: PL 259 coax connector

There are better crimp on connectors that work as long as the correct tools are used to prepare and crimp the connector on. The Shakespeare crimp has 4 thick prongs that crush the insulator when attempting to make contact using common tools (pliers). It affects the impedance characteristic of the coax cable and, more importantly, weakens the insulator structural integrity.

No matter soldered or _properly_ crimped, one still has to weather proof the connector to keep water from wicking into the coax. Use a good self amalgamating compound/tape - RTV or anything with a vinegar odor is acidic and will hasten corrosion. i also put a light coating of vaseline (petroleum jelly) over the threads to keep from binding due to corrosion.
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Old 02-05-2022, 08:37   #54
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Re: PL 259 coax connector

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I need to install VHF and AIS coax. Has anyone used the Shakespeare PL-259 solderless connectors? Any reviews? I have RG-8X coax.
Gold-plating will hold up in salt and fresh water. The problem is the cable shield contacts which are compression jaws in gold plate. May do well if a heat shrink collar or rubber tape are applied.
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Old 02-05-2022, 09:28   #55
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Re: PL 259 coax connector

We use em all day- best crimped on with standard slip joint pliers.
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Old 02-05-2022, 13:35   #56
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Re: PL 259 coax connector

This works and is easy.

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Old 02-05-2022, 14:45   #57
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Re: PL 259 coax connector

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This works and is easy.

... but only for the spin-on type of PL259 connector.

(not to knock them, I've installed 100's of the spin-on type of BNC connectors. The spin-on types have to match the cable used.)
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Old 03-05-2022, 10:47   #58
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Re: PL 259 coax connector

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No such thing as a "spin on PL259 connector". That is a standard PL259 without the reducer for use with .5" diameter cable. This is in essence the same thing I do with RG-8X as described in my post #19 above. It makes a solid connection to the braid. The only thing I do differently is I add about 2" of double wall shrink tubing after all is done.
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Old 03-05-2022, 11:47   #59
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Re: PL 259 coax connector

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No such thing as a "spin on PL259 connector".

Yeah, there is. Example. Example. The industry terminology is twist-on; please pardon me for saying spin-on.

Using a "standard" PL259 without a threaded reducer... if it works as a twist-on, yay, but I've not seen any specs for that, or what types of cables it's sized to twist onto.
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Old 03-05-2022, 13:10   #60
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Re: PL 259 coax connector

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Originally Posted by Lake-Effect View Post
Yeah, there is. Example. Example. The industry terminology is twist-on; please pardon me for saying spin-on.

Using a "standard" PL259 without a threaded reducer... if it works as a twist-on, yay, but I've not seen any specs for that, or what types of cables it's sized to twist onto.
That is so weird. I have never in my time working on HF antennas, VHF antenna, satellite antennas, 75Ω and 50Ω system, have never heard of a "twist-on" connector. Compression connector, yes. But twist-on? Interesting.

Thanks
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