N type connecter for scanking antenna?

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N type connecter for scanking antenna?

Postby Southwales » Thu May 24, 2018 11:44 pm

Hi, looking at buying this antenna, https://damsu.co.uk/scanking-royal-disc ... wc-waDTU1I needs an N type connecter, never used an N type or seen one before, where to buy and are they easy to fit on own coax, do they need soldering?...

What is your thoughts on the above antenna as a possible good coverage scanning antenna, plus hopefully later on as a transmitting antenna for if and when I get my amateure licence.
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Re: N type connecter for scanking antenna?

Postby Chris P » Fri May 25, 2018 8:25 am

N type connectors require soldering and are the industry standard for RF connectors for frequencies from HF to UHF for both Rx and Tx up to a 100W or so



having said that crimp on versions are available but in general soldering is the best way to make RF connections secure
Last edited by Chris P on Fri May 25, 2018 8:59 am, edited 1 time in total.
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Re: N type connecter for scanking antenna?

Postby m0lsx » Fri May 25, 2018 8:30 am

Good luck, that. That ScanKing is a Moonraker antenna. I once ordered three antennas from them. The three band colinear, which should be a plug & play, was not working & had sky high SWR. A handheld antenna also had sky high SWR as it's connector had been badly fitted & was thus not allowing the centre pin to make contact with my radio properly. So no RX or TX was possible. But the mobile whip worked fine. That was the last time I ordered a Moonraker antenna.
What I tend to do with N type connectors on antennas is use a N type to PL-239 connector & then have all of my coax with PL-259's on it. Like that when I take the coax off the VHF/UHF antennas, it can be used on HF, or any other antenna quickly & with no messing around with new connectors.
Image

A quick edit to add. I know my method of a adaptor is a bit of a bodge. But it works & makes life easier.
Last edited by m0lsx on Fri May 25, 2018 9:21 am, edited 1 time in total.
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Re: N type connecter for scanking antenna?

Postby Chris P » Fri May 25, 2018 9:03 am

My experience with moonraker antennas is similar to Alans and so I would not recommend them either.


one point about Ntype connectors is that the actual connecting parts of " Ntype" , BNC and TNC are very similar in size, if not identical. BNC standing for Bayonet N Connector and TNC standing for Threaded N Connector . They are not interconnectable though.



Alans use of adapters makes for easy reuse of cables, the ideal is to use as few adapters as possible but I use Ftype to BNC in a similar way when using Satellite coax
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Re: N type connecter for scanking antenna?

Postby Southwales » Fri May 25, 2018 2:09 pm

Hi, thank you for the replies, will skip that antenna idea, so would you all prefer so239 fitting on antennas to keep it simpler and cut down the need for an extra adapter?. My diamond White stick just required an so239 which I had no problem fitting and soldering myself, I have read the N type is more waterproof but if you are still using an so239 in the connection that does not matter and can just use waterproof taping.

I would very making the above antenna myself out of 2.5mm twin earth wire which I have plenty off but how would I go about waterproofing the copper wire for outdoor use?

Not that I am interested in a scanking now but what I am surprised about is the claim that this double discone can also be used to transmit https://damsu.co.uk/scanking-royal-doub ... wgLMqDTU1I which probably explains why I do so well transmitting through my homemade attic double bicone.
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Re: N type connecter for scanking antenna?

Postby m0lsx » Fri May 25, 2018 4:14 pm

If you are making the antenna yourself, then why not simply connect the coax & antenna directly together? So one joint rather than three. That is one connection to each connector & then the one the connectors make with each other.
As for waterproofing, simply put it into some white plastic pipe, but if it's an antenna cut for a specific frequency, allow for some change when you put it into the pipe. As the pipe slightly changes the impedance of the antenna.
You will need white pipe as some black & grey piping uses graphite in it's manufacture.
I have a 6 meter, 2 meter, 70cm & 23 cm transmit capable discone, but VSWR is a little high on the only band I use, 6 meters. And historically discones were designed to be transmit/receive aircraft antennas. By an ITT engineer in America during WW2, I believe. As the discone, being a genuine wideband antenna, would allow one antenna to cover all required frequencies at a low VSWR. And being a disc with a cone below it, would not provide too much air drag. Plus that disc with a cone sends most RF towards the horizon, not the sky or floor which is good for aircraft.
A close by (ground) signal is strong, so does not need RF efficiency to achieve & why heat clouds?
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Re: N type connecter for scanking antenna?

Postby G4RMT » Sat May 26, 2018 7:30 am

I'm the opposite. I positivly hate PL259 connectors, and I standardised on N types, and reluctantly use adaptors to go their way, if I have to! In practice, they're easier to put on - that's 100%. N types with BNC and TNC need precise cutting and trimming to be electrically and mechanically sound. N types are designed to reduce the chances of water getting in with seals. PL259s are not. Cheap PL259s also use pretty random contacts - so sometimes can be annoying.
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