Amplitude modulation on PMR446

Licence free two-way radio services that now includes both FM and digital channels. Discuss models, modifications and other similar worldwide standards such as FRS and GMRS.
Post Reply
ryan_paul
Radio Addict
Radio Addict
Posts: 895
Joined: 08 Feb 2005, 11:17
Location: UK

Amplitude modulation on PMR446

Post by ryan_paul » 12 Sep 2005, 11:01

Dear all
I was reading the specification for PMR446 and I Noticed that AM modulation is permitted.

Has anyone come across any rigs that are AM or even any NFM/AM rigs?

Although NFM suits itself better to this application I thought it was interesting.

User avatar
Transmission1
Admin
Admin
Posts: 2882
Joined: 29 Apr 2004, 18:38
Call Sign: 26TM001
Location: East Yorkshire, UK
Contact:

Post by Transmission1 » 27 Sep 2005, 07:26

That's interesting. I had not picked up on that. I don't think I've come across any radios with AM capability for the 446 band either here or in Europe, maybe there is no real demand. The biggest advantage of AM is the ability to open the squelch fully without the white noise. It's basically so quiet, this also means that you can generally hear more distant stations - anyone used AM CB? It's more relaxing to listen to on DX than FM is. The only real problem with the AM mode is that you can easily break through to nearby hi-fi equipment that usually has inadequate shielding. I can still remember back to when I was a kid and it was common to hear the police through my stereo system as the patrol cars drove past my house, they were using about 25W on AM and it was sufficient to break through even at some distance!

That said, it would be very nice to have the choice on a radio, don't suppose it will happen.
Simon, 26TM001 - East Yorkshire, UK
Founder of Transmission1 & Tango Mike 26 Division Co-ordinator
http://www.tangomike.net/

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest