Coax connectors for HF antenna

Submitted: Sunday, Dec 23, 2018 at 16:50
ThreadID: 137584 Views:3313 Replies:4 FollowUps:8
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Hi,
New to HF radio, and I want to use smaller connectors than the usual UHF type to connect antenna.
I was wondering if I can use BNC or F type for connecting antenna to tuner. The question is will they degrade the signal? I have a Icom IC 706mk2G and tuner - so sends out 100W.
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Reply By: GarryR - Sunday, Dec 23, 2018 at 17:01

Sunday, Dec 23, 2018 at 17:01
I have used bnc connectors for many years on the base staion and in the vechile using RG213U coax. I have steered away from "F" type due to lack of ground connectivity. Yes the "F" type are much cheaper to purchase and terminate, but I have always used bnc due to other club members advice in the past (Radio club). I am sure there shall be someone else that could shed more light on the subject as I am now a dinosaur on these products and have stuck with what I have known that works in the past.
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Follow Up By: Steve T12 - Sunday, Dec 23, 2018 at 17:33

Sunday, Dec 23, 2018 at 17:33
Thanks Garry,
Give me experience every time! That is the kind of advice I was looking for. There is even smaller connectors available it seems - but BNC is OK for my purposes.

Thanks for your advice, much appreciated.
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Reply By: HKB Electronics - Sunday, Dec 23, 2018 at 18:22

Sunday, Dec 23, 2018 at 18:22
From memory my Barret (125W) came with PL259 plugs to FME at the antenna turner from memory it is FME to PL259 then a 259 joiner and then 259 to FME. This is to make it easier to thread the tuner cable into the car. Never had any issues with this setup.

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Reply By: RMD - Sunday, Dec 23, 2018 at 19:43

Sunday, Dec 23, 2018 at 19:43
Steve
Connections aside,
I presume you wish to use the 706 for outback use. Is it an approved radio or that purpose?
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Follow Up By: IvanTheTerrible - Sunday, Dec 23, 2018 at 20:03

Sunday, Dec 23, 2018 at 20:03
Does this have anything to do with the question Steve T12 asked?
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Follow Up By: RMD - Sunday, Dec 23, 2018 at 21:47

Sunday, Dec 23, 2018 at 21:47
I mentioned, "connections aside", so it hasn't anything to do with performance, obviously.
I owned the same model Icom 706Mk2 G and thought it may be ok for Ham use and outback use.
There is a lot of additional stuff required for it to perform as many Barretts and Codans do. Seeing Steve said he is new to HF radio he may not be aware of the extras required or if it is indeed an approved radio accepted by the regulator.
No good if he sinks plenty of money into it and then finds out otherwise.
SO, to alert someone to something which may be important to him is probably quite OK. If he is fully aware of all factors then all is perfect and no harm done.
Simply asking that question of connectors indicates some unknowns for Steve.

If I was in the situation and starting out, it is hard to know everything as some seem to know. I would definitely want to be alerted if it was not a wise move.

Therein lies the reason behind the inoccent question Ivan.

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Follow Up By: Member - nickb "boab" - Sunday, Dec 23, 2018 at 21:50

Sunday, Dec 23, 2018 at 21:50
T12 has said he is new to HF and RMD is simply asking does he know that not HF radios can be used in australia .
Cheers Nick b

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Follow Up By: Nomadic Navara - Sunday, Dec 23, 2018 at 23:58

Sunday, Dec 23, 2018 at 23:58
Quote "I presume you wish to use the 706 for outback use. Is it an approved radio or that purpose?"

The Icom IC 706mk2G is an amateur band radio and can only be used on the amateur bands by people who hold a valid amateur licence.

If people wish to operate on services like the Outpost Radio (flying doctor network) or some of the commercial services like VKS-737 they must use approved equipment such as the Codan of Barrett brand radios.

The situation is explained in the ExplorOz article Outback Communication Requirements Explained under the HF Radio section.
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Follow Up By: RMD - Monday, Dec 24, 2018 at 12:33

Monday, Dec 24, 2018 at 12:33
PeterD
Thanks Peter, just as I thought, re, HF radios and approved ones.

Ivan may realize, with Steve asking tech questions for ham purposes most likely they would be directed to ham radio folk, where questions to outback traveller sites would be directed here and the radio may be unsuitable for outback comms if that is the intended useage.
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Reply By: Zippo - Sunday, Dec 23, 2018 at 22:09

Sunday, Dec 23, 2018 at 22:09
Steve, (sticking to the subject line) you are on the right track. BNC are entirely suitable for the job. UHF connectors on the other hand are non-constant impedance, and despite their series name they should really not be contemplated above 30MHz in any application.

BNC are normally considered suitable up to 2GHz, TNC (the threaded "equivalent" of BNC - B is for bayonet and T is for threaded) are generally rated to 4GHz and N-type to beyond. N type are similar OD to UHF and present the same physical issues in feeding through openings in panels (firewall etc).

In terms of dealing with vibration, UHF (and particularly the cheaper ones) are quite prone to unscrewing. BNC being a bayonet type do not. Quality N and TNC connectors have a sealing washer which minimises this behaviour.
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Follow Up By: Malcom M - Monday, Dec 24, 2018 at 07:03

Monday, Dec 24, 2018 at 07:03
Be aware that there are different impedance BNC's available
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Follow Up By: Nomadic Navara - Monday, Dec 24, 2018 at 15:21

Monday, Dec 24, 2018 at 15:21
If you are purchasing your connectors from Jaycar then the plugs are labelled as to the cable size, this will give the correct impedance. For more info see Types and compatibility, click on the picture to enlarge.



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