DIY 446mhz PMR Handheld Antenna? - Page 1
Forum section: electronics / rf-microwave

author: dexters_lab
author_rank: Unknown
timestamp: January 29, 2016, 05:46:39 pm
content: i have a baofeng uv5r that i have tuned only to the PMR channels, which are on 446mhzthe 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 bettergiven 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?

author: johnkenyon
author_rank: Regular Contributor
timestamp: January 30, 2016, 06:02:37 pm
content: Quote from: dexters_lab on January 29, 2016, 05:46:39 pmYou do realise there's a limit on the ERP for PMR446, hence the crap two mile/3km line of site range.

author: dexters_lab
author_rank: Unknown
timestamp: January 30, 2016, 08:44:06 pm
content: Quote from: johnkenyon on January 30, 2016, 06:02:37 pmyes, i am aware of that and the other limitations, output power etc

author: Lord of nothing
author_rank: Super Contributor
timestamp: March 28, 2016, 08:26:12 pm
content: 1) no removal Antenna is allowed2) no more than 0,5Wso any Baofeng is ilegal on 446.

author: SeanB
author_rank: Super Contributor
timestamp: March 28, 2016, 08:40:24 pm
content: 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.

author: stj
author_rank: Super Contributor
timestamp: April 17, 2016, 04:58:20 am
content: take a look at the "Kinnota" antenna's at 409shop

author: CJay
author_rank: Super Contributor
timestamp: April 22, 2016, 01:28:01 pm
content: Quote from: dexters_lab on January 29, 2016, 05:46:39 pmYes, but you're not going to benefit much, at best you'll end up with something as good as the original unless you spend a bit of time researching antenna design and experimenting (a perfectly valid use of time IMHO)For a few quid you can buy a replacement whip antenna for it that will work well.If you're determined to build something then buy one of the SMA to BNC or SO239 adapters on eBay and tinker away.

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 22, 2016, 05:55:12 pm
content: Its illegal to use an Baofeng on PMR. Even an Replacement Antenna make it more illegal.

author: stj
author_rank: Super Contributor
timestamp: April 23, 2016, 02:27:15 pm
content: so?the post is about antenna quality, not relative laws.

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 24, 2016, 06:17:42 am
content: So on PMR you cant chance the Antenna so the Tread is useless.

author: CJay
author_rank: Super Contributor
timestamp: April 24, 2016, 07:05:39 am
content: Quote from: Lord of nothing on April 24, 2016, 06:17:42 amBeg to differ, antenna theory is applicable to all areas of radio, man made laws only apply to men, not physics so information about antenna design is useful so if we can get rid of the 'it's illegal' comments then it could be a useful thread