Electronics > RF, Microwave, Ham Radio

DIY 446mhz PMR Handheld Antenna?

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dexters_lab:
i have a baofeng uv5r that i have tuned only to the PMR channels, which are on 446mhz

the supplied short 'rubber duck' style antenna is generally regarded as shit and ebay is full of fake aftermarket antennas for this radio that seem to be no better

given i have no experience with RF and no suitable equipment for testing would it be possible to rip out the existing spring in the stock baofeng antenna and make my own, tuned to 446mhz?

johnkenyon:

--- Quote from: dexters_lab on January 29, 2016, 05:46:39 pm ---i have a baofeng uv5r that i have tuned only to the PMR channels, which are on 446mhz

the supplied short 'rubber duck' style antenna is generally regarded as shit and ebay is full of fake aftermarket antennas for this radio that seem to be no better

given i have no experience with RF and no suitable equipment for testing would it be possible to rip out the existing spring in the stock baofeng antenna and make my own, tuned to 446mhz?

--- End quote ---

You do realise there's a limit on the ERP for PMR446, hence the crap two mile/3km line of site range.

dexters_lab:

--- Quote from: johnkenyon on January 30, 2016, 06:02:37 pm ---
--- Quote from: dexters_lab on January 29, 2016, 05:46:39 pm ---i have a baofeng uv5r that i have tuned only to the PMR channels, which are on 446mhz

the supplied short 'rubber duck' style antenna is generally regarded as shit and ebay is full of fake aftermarket antennas for this radio that seem to be no better

given i have no experience with RF and no suitable equipment for testing would it be possible to rip out the existing spring in the stock baofeng antenna and make my own, tuned to 446mhz?

--- End quote ---

You do realise there's a limit on the ERP for PMR446, hence the crap two mile/3km line of site range.

--- End quote ---

yes, i am aware of that and the other limitations, output power etc

Lord of nothing:
1) no removal Antenna is allowed
2) no more than 0,5W

so any Baofeng is ilegal on 446.  :=\

SeanB:
My one surprised me, by being able to work the regular repeater I used at a distance of a little over 30km, using the stock antenna on 144Mhz. It is not great, but pretty usable though.

You would probably be better off putting on a counterpoise using a small crimp ferrule and a short length of wire leading down the handset.

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