[ARC5] F-86 Radios

[Sandy]

They were relatively primative technology actually. Straightforward 6AK5 IF 
string, 1N25 crystal mixer and lighthouse tubes for local oscillatorand 
transmitter oscillator.  Frequency determined by a high Q cavity. 
Frequencies were 1030 and 1090 hz. receiver and transmitter respectively or 
the reverse order.  It's been MANY years so I forget!  If you had a pocket 
general coverage receiver (Like ICOM R1) you could hear the aircraft's 
signals easily when they were swept by the radar.  There was PLENTY of 
"replies" when the airliners are waiting to taxi and moving around the 
airport.  I have no earthly idea what they are using now.  At one time one 
of the commercial modes sent a coded altitude reply.  FAA was supposed to be 
playing with a radar display in "3D" mode using a rotating flat circular 
screen PPI indicator!  The pivots being at the "north and "South" pole ends 
of the screen.  The aircraft blips were "suspended" in "mid air" to the eye 
and vertical displacement represented relative altitude.  Very experimental. 
Never heard any more about it after that.  It sounded interesting but kinda 
a bulky "Globe" for the glass envelope!

Anybody hear of such a device in plans or actual fact?

Sandy W5TVW

-----Original Message----- 
From: Mike Morrow
Sent: Saturday, December 22, 2012 7:11 PM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] F-86 Radios

Sandy wrote:

> The IFF coder was indeed the KY-95/APX-25 I think.  The old RT-82/APX got
> converted and a coder socket provided.

The RT-82/APX-6 became the RT-279/APX for the AN/APX-25.  That set was 
around for a
long time.  I remember seeing some under repair in the avionics shops at 
Blytheville
AFB in 1969...which indicates that it must have been still in service on 
either the
KC-135 or B-52 aircraft stationed there.

Mike / KK5F


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