[Milsurplus] Aircraft comm/nav specs

[Kludge]

The spec for stability was changed in 1994 due to the tightening from 50 to
25 KCs channel spacing.  Owners had until 1 Jan 1997 to change out the old
radios or have them modified since a few manufacturers made kits to upgrade
their sets.  I have the FCC list of unacceptable radios if anyone wants to
see it.  

Among other things, I have a complete FES-1240 (two Type 210 [RT-11]
transmitter/receivers*, two Type 15F VOR/LOC systems, one each R-31 3-light
marker beacon Rx & R-33 glide slope Rx and a Type 21 ADF) as removed in 1996
from a 1961 Cessna 310.  This was swapped out in compliance with that
ruling.  I don't know either the side number of the airplane or what was
used to replace it although I would love to know the former.  

* The original FES-1240 used one RT-11 and one T-25, the latter to be used
with the #2 Type 15 as an Rx.  The one I have had the two Comm units
independent of the Nav.  

The AN/ARC-1 et al were long gone by then in aircraft use so pretty much
didn't count.  On the other talon, military equipment in use had to comply
with the rules as well but I have no clue what radios - if any - were
grounded and what was used to replace them.

Best regards,
 
Michael, WH7HG BL01xh
http://www.nationalmssociety.org/chapters/NTH/index.aspx 
http://wh7hg.blogspot.com/ 
http://kludges-other-blog.blogspot.com 
Hiki Nô! 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Ken Kinderman
Sent: Tuesday, 24 August, 2010 09:15
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?

Anyone?

>   _____
>
>
> Something that has surprised me is the number of aircraft radios that were
> made unacceptable on 1 Jan 1997 that still draw way too much money.  I
> talked to one of the local radio shops...
>
>
Ken,

W2EWL
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