[Milsurplus] FM Terminology

[gl4d21a at juno.com]

Wideband is different from wideband.

Some of you will recall I posted this before.  WW2 MILSPEC "wideband" FM was about +/-100 kHz deviation. Closer to broadcast standard than land mobile radio.  Sometime earlier than 1953, land mobile "wideband" FM was limited to +/-15 kHz deviation, and receivers couldn't handle the wider swing of the MIL transmitters.  Vice-versa was OK, just "weak" audio.

HTH & 73,
George
W5VPQ


---------- Original Message ----------
From: MillerKE6F at aol.com
To: RAFANTINI at salisbury.edu, milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] RT-67/68 and the like
Date: Fri, 10 Feb 2012 16:16:04 -0500 (EST)

RE: GRC 7,8 etc.  
 
    Wide Band FM aside, the transmitters in these  things are stable beyond 
belief so I don't think that was a problem. Keep in  mind that most of the 
land mobile stuff in the early 50s was also Wide Band fm  so I think it was 
merely a choice at the time based on the technology  base.  The design of 
these monsters was quite exotic with heterodyne  schemes and so on for both tx 
and rx.   As to reliability, these old  war horses would probably stand up 
well against the later RT 524 things the Army  adopted and me thinks the RT 
524 is damn near as heavy as the GRC-8 unit.  (snip)

____________________________________________________________
53 Year Old Mom Looks 33
The Stunning Results of Her Wrinkle Trick Has Botox Doctors Worried
http://thirdpartyoffers.juno.com/TGL3131/4f35a96a9e97f122b88dst02duc