PMR446 at 10 km?

Forum for CB, PMR, Ham, Business users, GMRS, Repeaters and all other TX Chat

PMR446 at 10 km?

Postby andygoole » Thu Aug 14, 2014 8:49 pm

How can these units offer more range than others? Are they different frequencies, antennas or something else?
GRE PSR-255
Oregon Scientific TP329 (x2)
AOR ar8200 (sold)
Alinco DJ-X3e
Realistic Pro2006
Uniden UBC75XLT
Uniden UBC3500XLT
Baofeng UV-5R + Qualette (Blue)
Baofeng Bf-888s (x2)
Boafeng UV-5B
Licence: Short Range VHF Marine
Licence: Simple UK Light
andygoole
 
Posts: 48
Joined: Fri Oct 11, 2013 2:04 pm

Re: PMR446 at 10 km?

Postby thelad » Thu Aug 14, 2014 10:10 pm

What units?
thelad
 
Posts: 1087
Joined: Thu Dec 06, 2012 9:30 pm
Location: Uk, Yorkshire.

Re: PMR446 at 10 km?

Postby andygoole » Thu Aug 14, 2014 10:27 pm

thelad wrote:What units?

have seen Motorola TLKR T80 and XTNi Series amongst others advertising as pmr446 yet with 10km range

http://www.pocket-lint.com/news/118173- ... ie-talkies

http://www.motorolasolutions.com/XU-EN/ ... XTNi_XU-EN
GRE PSR-255
Oregon Scientific TP329 (x2)
AOR ar8200 (sold)
Alinco DJ-X3e
Realistic Pro2006
Uniden UBC75XLT
Uniden UBC3500XLT
Baofeng UV-5R + Qualette (Blue)
Baofeng Bf-888s (x2)
Boafeng UV-5B
Licence: Short Range VHF Marine
Licence: Simple UK Light
andygoole
 
Posts: 48
Joined: Fri Oct 11, 2013 2:04 pm

Re: PMR446 at 10 km?

Postby 2E0UCW » Fri Aug 15, 2014 7:13 am

Excuse my ignorance in regards to this subject, but how does the range of a PMR446 radio vary so much just based on the radio model when they should all be 0.5w and fairly much have a rubber duck or similar antenna?

I can understand range variations with amateur due to varying antenna's and being able to use different watt's depending on the licence.
2E0UCW
 
Posts: 329
Joined: Sat Sep 14, 2013 4:46 pm
Location: United Kingdom of Great Britain and Northern Ireland (Just up the road from EGLL)

Re: PMR446 at 10 km?

Postby m0lsx » Fri Aug 15, 2014 7:35 am

The UK distance record for optical communication is well over 100km & the answer to how you can use an LED at 100km plus & a 446 pmr at distances of up to 10km are much the same. First those who sell these PMR radios are not saying you will do 10km under normal conditions, just that under certain ideal conditions they potentially could do that & secondly it has to be line of sight due to path attenuation.
So find yourself two locations 10 km's apart, with a clear line of sight, preferably with salt water in between & a following wind. Plus with ideal atmospheric conditions & you may just make the contact.
The reality is however that 10km is probably no more dishonest than 3km, as under normal back to back use a 1000 meters is a more realistic maximum.
Buy a database from Kimmy JS19 via http://ukscanningdirectory.co.uk/
Or do Google search of this forum via https://cse.google.com/cse/publicurl?cx=017721449704518888595:wswa65nq4ww
73 De Alan (M0LSX.)
http://www.qrz.com/db/M0LSX"
User avatar
m0lsx
 
Posts: 5702
Joined: Wed Nov 21, 2012 9:14 pm
Location: Norwich. TG21.

Re: PMR446 at 10 km?

Postby 2E0UCW » Fri Aug 15, 2014 10:12 am

I've looked at various radios, all using 0.5w and antenna's around the same size and wonder if I have a radio advertised at 3km and 10km trying them from the same location under the same conditions, would I be able to make contacts at 2 different distances?

I fully understand that conditions play a major role with radio but just wonder how a single manufacturer can sell a range of radios claiming a range from 3km to 10km.

Ideally they would be tested in the same environments, are limited to the same watts and all have similar aerials - how do they get such a wide variety of distances?

It's not like having a car with the same capacity engines tweaked differently or with start/stop affecting the fuel consumption.
2E0UCW
 
Posts: 329
Joined: Sat Sep 14, 2013 4:46 pm
Location: United Kingdom of Great Britain and Northern Ireland (Just up the road from EGLL)

Re: PMR446 at 10 km?

Postby JGR » Fri Aug 15, 2014 3:42 pm

Its a form of poetic licence granted to sales teams as for instance the day when the Antron A99 was released with a claimed 9,9dB(I) which is an almost impossibility but they must have found some way to manipulate their findings so that they were correct at least in theory, but that got the pass from whoever controls the advertising legislation.
John 2E0JGR CMH (clinical master hypnotist)
JGR
 
Posts: 199
Joined: Tue May 28, 2013 10:51 am
Location: Cumbria

Re: PMR446 at 10 km?

Postby JOHN IN YORK » Sat Aug 16, 2014 3:19 am

I think that it is all a bit of sales patter.How many times does a manufacture advertise an aerial that gives for example,8db gain.They do not indicate if it is a gain of 8dbi or 8dbd.
Even cars,they do not tell you that when they are them testing them for maximum MPG,the doors have masking tape around the edges.This is to reduce wind resistance.
Regarding 446 mhz,someone did work from near Newcastle into the Netherlands and this was just on 500mw.But there was a good lift on.
I have worked 19 miles,but that was with 1 watt and a longer aerial.BUT,I was in a good location,500 ft ASL.Even with 500 mw,I would have made the distance.
Going back to the original article.If both of the sets are high up,there should be no reason why the distance should not be 10 km or more.But come down in height,3 km or less would be more realistic.In a built up area,as Alan has said,1000 metres is about norm,or less.

Regards,John.
JOHN IN YORK
 
Posts: 108
Joined: Thu Apr 17, 2014 12:32 am


Return to The TX'ers Forum

Who is online

Users browsing this forum: No registered users and 1 guest