[Milsurplus] FM Terminology

[C.Whitaker]

de WB2CPN
Anyone know what the deviation on the SCR-610 was?
73  Clete
++++++++++++++++++++++++++


On 2/10/2012 6:33 PM, gl4d21a at juno.com wrote:
> 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)
>
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