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PMR mobile external antenna
Topic Started: Monday, 12. March 2018, 15:33 (452 Views)
ArA
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26 Charlie Tango 6262

I understand that using a handheld from inside the car is not ideal but is an external worth the effort
(or should i just get off my backside and get out the car?)

So first problem there are very few antennas for the PMR frequency searching so far 1 from Sirio and 2 from Panorama.
(Yes plenty of dual bands but none above 430Mhz will they tune to 446 with a low SWR)
add in some losses for patch leads/adapters. Am i better off with decent whip on the handy ie Nagoya 771 etc.

What is everyone using?
(of course this a completely hypothetical scenario for deployment in a foreign land)
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Radio Pixie
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26 Charlie Tango 052

Hi, yes I would consider an magmount antenna on top of your car a good idea. As for using 432 MHz antennas on 446 MHz, most can be adjusted or trimmed. Antennas for UHF business type radios (which used to be called PMR) may have to work right up into the 450's MHz, therefore easily covers 446 MHz. As for adapters, go for the best quality BNC to SMA you can find (assuming that is what you meant?). The PL type connectors are not recommended, especially via adaptors. A short patch lead with good connectors shouldn't be that lossy. A 25cm piece of RG58 of 400+ MHz will be only a loss of 0.1dB. Even if a patch lead plus connectors had a loss of 1dB (which is still small) having the antenna on the roof would easily compensate, and would have a better and more reliable signal over a handie in the car.

As for the Nagoya, the problem with that brand is that the quality control is bad and what you get is a bit hit and miss.

Edited by Radio Pixie, Monday, 12. March 2018, 17:23.
73 from Dave the Pixie 26CT052 - G7OPC - CB & Ham Radioaficionado :)

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ArA
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26 Charlie Tango 6262

many thanks for the info RP.

yes the Nagoya was just an example as i heard they are tuned for 446 rather than 70cm.
(finding a good non fake can be problematic)
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Mudslinger
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I have a small antenna with a magmount similar to this one.

https://www.ebay.co.uk/itm/Magnetic-Dual-Band-SMA-Female-Car-Mobile-UHF-VHF-Antenna-144-to-430MHZ/182677091733?epid=22014723558&hash=item2a88673595:g:NvMAAOSw38BagtRw


It works about the same as using a longer rubber duck type antenna inside the car.


I actually think the antenna is better, but the thin coax (RG-174) has a high loss at 446Mhz which is evening things back out.
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ArA
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26 Charlie Tango 6262

Thanks mudslinger

The plan so far is to use a Sirio 145pl mag-mount replace the RG58 with Ultraflex7 (less loss than 213)
and then find a suitable PL mount antenna. (also i can use the same mount for my CB also)
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Radio Pixie
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26 Charlie Tango 052

Coincidently I was thinking today what magmount you intended to buy. I would defo go for the Sirio. Good quality materials are used, the magnet is strong, and it does go up to 400+ MHz as quoted by the manufacturers.

I tested a Sirio against a Moonraker magmount a long time ago both with SO239 fitting. With a dummy load screwed into the mount, I tested the SWR and found the Sirio had a good SWR for 400+ MHz, but the Moonraker's 400+ MHz SWR was quite high. I looked inside the Moonraker and discovered that the inner core of the coax was over an inch in length causing a mismatch, hence the higher SWR. The Moonraker was untouched apart from my own Pixie hands, so the coax connection was original.

For a few quid more it's better to go for Sirio. Cheaper magmounts are a false economy!!
73 from Dave the Pixie 26CT052 - G7OPC - CB & Ham Radioaficionado :)

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Andy591/P
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26 Charlie Tango 1591


Just a thought. sat here with a calculator, 1/4 wave on 432, 173mm. 1/4 on 446 168mm

If you have a mobile for 70cm.'s try putting a file to the end of it and take off a couple of mm and see if it
starts showing a tune towards the 446 band.

Only tried it on yagis , I can't say it will definitley work.
Designing and building even bigger Antennas. Hoping for some good DX, waiting for solar minimums to fade away.
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