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Which connector BNC / N type / PL259
Topic Started: Friday, 9. March 2018, 10:33 (397 Views)
ArA
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26 Charlie Tango 6262

Ok because i simply do not want dual mounted antennas on the car I am looking for the best
solution to use one mount for CB and 70cm the 70cm handheld is SMA and CB std PL259.

Option 1 use a SO239 to SMA adapter just for the handheld.
Option 2 use the really expensive type n connectors i was sold ("because they were the best for UHF")
on the antenna coax and then adapters on both the CB and the handheld.
Option 3 Use BNC on the antenna coax and then adapters on both the CB and the handheld.
Option 4 Use SMA on the antenna coax and then SMA to PL259 on the CB

Was planning on replacing the coax on the Sirio 145 PL with ULTRAFLEX 7 so fitting a new connector was
on the cards any way.

I am worried that the large N type & SO239 to SMA adapters will put strain on the handheld connector.
Also been told using a pigtail or patch lead of say "lossy" RG8 would defeat the point of fitting the low loss ultraflex 7.

I seem to have more miss information than information... :sos:
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Radio Pixie
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26 Charlie Tango 052

In some respects whatever connector type that is convenient for you. Yes the PL259/SO239 isnt the best for 70cm UHF use. A well soldered PL259 in itself will work on 70cm and any slight mismatch can be sorted by a small antenna adjustment if necessary. One of the big problems with these type of connectors at 70cm are adaptors, which may cause a bigger mismatch and losses. Unfortunately the quality of adaptors can vary.

At 70cm, better to have a N or BNC connection from the magmount and then have the choice of a short patch lead that connects to the 70cm handy. The loss would would hardly be measurable For example, a 50cm long length of RG58 at 432 MHz would have 0.2dB loss. That's not even worth considering.

As for the CB, either another patch lead or an adaptor on the rigs SO239 socket.

73 from Dave the Pixie 26CT052 - G7OPC - CB & Ham Radioaficionado :)

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BigTone
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26 Charlie Tango 4498
What aerial are you proposing to use?
I cannot think of any that will give a decent performance on both bands
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ArA
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26 Charlie Tango 6262

Sorry should have been clearer will be using 2 different antennas.
The setup is to go into my other half's 1966 splitscreen camper so no drilling holes allowed. I have already had "the look" when I mentioned fitting a radio trying to keep things a clean and simple as possible.

Finding "quality" fittings is the biggest problem. maybe i am over thinking the losses in patch leads and adapters?
Looking at info from here http://www.qsl.net/co8tw/Coax_Calculator.htm and the un qualified figure of 0.1dB insertion loss on cheep adapters. So in my situation
4m of RG58 -1.3dB + adapter -0.1dB + 0.5m of RG8 -0.148dB + adapter -0.1dB = -1.648dB or 37.5% power loss! is this really the case?

going to Ultraflex7 straight to the handy would make the biggest change will a loss of only -0.7dB in the cable and but finding a SMA female connector is problematic. fine for type N or BNC.

Getting the feeling it would be easier just to get out of the van and use the rubber ducky aerial on the handy :bash:





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Radio Pixie
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26 Charlie Tango 052

I just replied to your other post :wave:

OK, I can understand more of what you are trying to do.

I don't see the point of having 4 m of RG58 then 0.5m of RG8. Just go for the Ultraflex and a BNC plug, and use a BNC socket to SMA female adaptor. You will have the added benefit on quick release of the antenna connection from the handie. SMA's have fragile pins. Busted adaptor is easily replaced than replacing a SMA connector. BNC's are ideal for mobile and portable work.

As for loss, there is always going to be some. All we can do is try to minimise losses the best we can and compensate some where in the system, which is in your case is having an external antenna. If you are really concerned about loss, have an antenna with higher gain.

73 from Dave the Pixie 26CT052 - G7OPC - CB & Ham Radioaficionado :)

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ArA
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26 Charlie Tango 6262

Sorry RP
I have 3 threads running... which type of antenna / how to connect it / should i bother.
felt it was to much to cover in the one thread and some people tune out if you mention PMR etc.

So I have conclude with your help replace the RG58 on the mag mount with the Ultraflex7 and a BNC socket. Then adapters use adapters for the CB and Handy.

Now just need to decide on an antenna...
as i don't have a antenna tuner or SWR for UHF not sure about using a std dual band.
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Radio Pixie
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26 Charlie Tango 052

Hi again. I hope you meant BNC plug for the magmount.

If size isn't an issue, the Watson W770HB I know from experience has a low SWR to 450 MHz. Needs a magmount with a SO239 socket: [url=www.pjbox.co.uk/watson-w-770hb-watson-2m-70cm-dualbander-vhf-uhf-antenna.html]Click for LINK[/URL]

Some 70cm antennas will go up to 450 MHz because they are designed for the American Ham market, as they have a greater chunk of radio spectrum than we do here in the UK with our top end of 70cm being 440 MHz.

There's probably plenty of antennas that will suit your cause. Hopefully other CT members can help out with other suggestions.
73 from Dave the Pixie 26CT052 - G7OPC - CB & Ham Radioaficionado :)

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ArA
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26 Charlie Tango 6262

Yes have noticed that Sirio have "USA" dual bands that are 440-450Mhz
looking at the STD Diamond dual band the SWR at 446 is >2:1 :(

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Radio Pixie
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26 Charlie Tango 052

>2:1 is OK. That's probably better than most rubber ducks!
73 from Dave the Pixie 26CT052 - G7OPC - CB & Ham Radioaficionado :)

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