[Milsurplus] Aircraft comm/nav specs

[Ken Kinderman]

Jim and others,

Thanks for the info. So, as I read it, it has nothing to do with emission
purity or stability (although there must be some stability and accuracy
requirement somewhere in the regs)... more to do with channel capacity and
spacing, and the requirement to be able to access more discrete channels
than ever before.

The reason I ask is that I am working with some vintage aircraft
restorations that include ARC-3 and SCR-522. Naturally, these aircraft have
up-to-date avionics on the cockpit panel. But from the comments, there would
seems to be nothing to preclude operating these older sets on a channel or
two. The better course of action would be to crystal them for the ham bands
and have some aeronautical mobile fun when aloft.

By the way, was up at Oshkosh a few weeks ago... the most visible vendor,
with multiple tents, booths and dealers was Garmin.

73,

Ken
W2EWL

On Tue, Aug 24, 2010 at 3:52 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

>
>
>
> -----Original Message-----
> >From: Ken Kinderman <scr274 at gmail.com>
> >Sent: Aug 24, 2010 2:14 PM
> >To: milsurplus at mailman.qth.net
> >Subject: [Milsurplus] Aircraft comm/nav specs
> >
> >What happened on Jan 1, 1997 to affect aircraft comm specs? Anything to do
> >with acceptability of plain old AM as in ARC-3, ARC-1 operation? Something
> >tells me it was related to minimum channel capacity?
> >
> Probably that's when the channel spacing was shifted to 0.25 KHz from 0.50
> KHz
>
>