[ARC5] Early PBY radios and equipment needed. GO-9, ATB and lots more

[Mike Morrow]

The ZA/ZA-1 ILS is the 1940 version of the early commercial Air-Track ILS.
 
MF LOCALIZER 300-800 kHz, two lobes modulated at 90 and 150 Hz. 
VHF GLIDE SLOPE 90-98 MHz, lobe modulated at 60 Hz.
MF MARKER BEACON 300-800 kHz, uses different transmitter on same frequency as LOCALIZER, modulated with an unspecified audible tone.
 
The ZA required an RU-* receiver as the localizer.  Jack Antonio is the only person I know who has assembled a complete ZA ILS.
 
The ZA was used sparsely only by the USN.  It was to be replaced by the 1943 AN/ARN-9 updated Air-Track ILS:
R-43/ARN-9 GLIDE SLOPE, plus LOCALIZER converter
R-23 or R-24/ARC-5 with MX-19/ARC-5 ILS audio adapter for LOCALIZER and MARKER BEACON.
 
The Air-Track ILS was abandoned in mid-WWII for the USAAF's far superior SCS-51 ILS that used the AN/ARN-5 UHF Glide Slope and RC-103-A VHF Localizer receivers.
 
I believe that the ZA ILS can be safely considered obsolete by mid-WWII.
 
The SCR-515-A (ABA) Mark IV IFF system used the BC-645-A mentioned elsewhere in this thread.  The US Armed Forces in WWII settled on using the UK's Mark III IFF (SCR-595-A, ABK) and Mark IIIG IFF (SCR-695-A, ABF).  The Mark IV IFF was held as a never-used reserve.  The only people for whom there is *good* evidence using the BC-645 are ham radio ops who bought the never-issued gear as post-war surplus.
 
Mike / KK5F
 
-----Original Message-----
From: 
Sent: Feb 28, 2022 3:44 PM
To: 
Subject: Re: [ARC5] Early PBY radios and equipment needed. GO-9, ATB and lots more
 
I have a  Glide Path Receiver, Type CDE-46120, a unit of Model ZA Aircraft Radio Equipment, which has a yellow stamp on it, "PBY-5A" that I would be glad to donate to such a worthy cause.  And I live only about 60 miles south of American Aero of NSB, FL.
 
Wayne
WB5WSV