N type connectors.

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N type connectors.

Postby Farmerjim50 » Tue Oct 22, 2019 12:01 pm

Hi, thanks for accepting me on the forum :smiles:

I've just ordered a Royal discone antenna and it uses N type connectors. I'm confused as to which one to buy, I intend using a fairly short run of PF100 satellite coax , the diameter is 6.8mm but I can't find an N type which is this size , they all seem to cater for larger cables. Can anyone point me in the right direction?
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Re: N type connectors.

Postby Chris P » Tue Oct 22, 2019 2:19 pm

Ntype connectors with reducers are available for thinner coax but they are 50ohm impedance as(in theory) is your discone . If your cable run is fairly short ie less than 8m using a thinner50ohm coax will not degrade your signal that much . However there is a lot of substandard rg58 about so watch where you buy it from .

There are versions of Ntype connectors designed for use with mini8 coax(aka super 8 ) which are available from the suppliers of that cable
Regards Chris aka G8FFF nipper or tazmin88
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Re: N type connectors.

Postby Farmerjim50 » Tue Oct 22, 2019 2:57 pm

Thanks Chris, I know the PF100 is 75ohm but I use it all the time for rx and it's ok for that. I'll see if i can find someone that sells reducers. I usually use RS for this sort of kit but can't find anything on their site. So many connectors but not one it seems for the size I need.
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Re: N type connectors.

Postby Chris P » Tue Oct 22, 2019 5:12 pm

Yes I totally agree regarding using Satellite cable for reception purposes as it is very low loss over the VHF and UHF range and is also very cheap compared to standard coax ( RG213 or westflex for example) The screening on the better types is also an advantage .
I normally use F type connectors with adapters on sat cable and have found that 75ohm BNC connectors can be adapted for use with sat cable too depending on the type of inner insulation the cable utilises .

No wideband antenna has an impedance of 50 ohm over its whole range anyway lol
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Re: N type connectors.

Postby m0lsx » Tue Oct 22, 2019 7:48 pm

One option I often use. Mainly because I try to change my coax regularly on VHF/UHF. Is to use an adaptor. It is a little bit of a bodge, as connectors add in losses. Small ones, but losses all the same & they are not as reliable as a single connector properly soldered or crimped onto the coax. But they do work.

F type to N type adaptors are reasonably easy to buy. Ebay for example has the following available.

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Re: N type connectors.

Postby Farmerjim50 » Tue Oct 22, 2019 10:57 pm

Thanks for the input guys.
I try to limit the amount of connectors in the line as you know the sort of losses they produce at higher frequencies!
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Re: N type connectors.

Postby m0lsx » Wed Oct 23, 2019 8:40 am

Farmerjim50 wrote: I try to limit the amount of connectors in the line as you know the sort of losses they produce at higher frequencies!


Strangely connectors have an insertion loss, not an insertion loss based upon frequency. Although up in the GHz they do specify & work with insertion losses for connectors & it's a complicated calculation based upon SWR, Dielectric & Copper loss etc. But at HF/VHF/UHF the average loss of a single extra, reasonable quality connector would be around 0.1dB. So non existent.

If you think about it, insertion losses in a scanner set up are minimal. We do not, (in general,) use SWR meters, antenna switches, ATU's etc. And all of those add in 2 connectors plus the insertion loss of the item it's self. So a single connector being used below say 2 GHz & in general a good connector would have an insertion loss below 3 or more GHz. Is non existent.
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Re: N type connectors.

Postby radiostationx » Thu Oct 24, 2019 9:22 am

You need a 7mm entry connector which differs from the more common 6mm and 10.3mm versions.
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You can find them here, very reasonable quality and wont break the bank.

https://www.mirfield-electronics.co.uk/rf-cable-pl-n-connectors/
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Re: N type connectors.

Postby Farmerjim50 » Thu Oct 24, 2019 12:05 pm

radiostationx wrote:You need a 7mm entry connector which differs from the more common 6mm and 10.3mm versions.
Image
You can find them here, very reasonable quality and wont break the bank.

https://www.mirfield-electronics.co.uk/rf-cable-pl-n-connectors/


Thanks very much for the link, that's just what I need :thumbup:
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