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

[DSP3]

These posts beg a question, or two.  I understand the 90/150 Hz VHF and 
UHF LOC and G/S but how did this VHF-only system (ARN-9) work?  Or, was 
is horizontal guidance only??

Jeep - K3HVG



On 12/23/2015 11:43 AM, Mike Morrow wrote:
>>> 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
>
>

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