[ARC5] R23 repair, dynamotor mounts, questions...AN/ARN-9

[Mike Morrow]

>> One thing I saw was the 15uF capacitor is mounted on a small insulation
> mount - so its not bolted to the chassis.

> Yes. That was a feature in some of the early models which (as I remember it) 
> fed an ILS system. You can safely remove that insulator and the ground wire 
> and bolt the cap directly to the chassis

That is a feature which is on ALL AN/ARC-5 navigation receivers R-23, R-23A, R-24, and R-148...early or late.

It supplies filtered AF through the MX-19/ARC-5 audio adapter installed in the receiver for use as the MF localizer to the AN/ARN-9 "Air-Track" ILS (improved ZA, ZA-1, ZAX).  Major components of the AN/ARN-9 are:

R-43/ARN-9 VHF glide-slope receiver/ILS converter
C-62/ARN-9 Control box
ID-24/ARN-9 Cross-needle indicator
J-32/ARN-9 Junction box

The AN/ARN-9 is extremely rare, because very fortunately the USN abandoned the Air-Track ILS by 1944 in favor of the USAAF's far far superior SCS-51 system (with RC-103 vhf localizer, AN/ARN-5 UHF glide slope, and I-101 indicator), the basis for the ILS used worldwide since.

So where AN/ARC-5 documentation mentions the associated ILS, it's the AN/ARN-9 to which it refers.

Mike / KK5F