[ARC5] [Milsurplus] " ZA Instrument Landing Check-Off List " Also AN/ARN-9.

[DSP3]

Mike, et al,

Thanks for the info.  I guess I've always confused the ARN-9 with the 
likes of the ARN-5(or 18) and ARN-14 setup.  Did the Air-Track have 
channels or single frequency and did they use the same 90Hz and 150Hz 
GS/LOC modulation?  Curious to know.

Jeep - K3HVG


On 11/3/2017 5:58 PM, Mike Morrow wrote:
> Jack Antonio has put together what is likely the only complete ZA 
> "Air-Track" ILS set anywhere in the world.  That's quite an 
> achievement, impressive especially since so many military radio hams 
> don't give a damn about a radio's history and technology unless it can 
> be used for ham band chatter.  The ZA has its own VHF glide slope 
> receiver, and uses an RU-series receiver for the MF localizer.  It was 
> rather difficult to use, as the text on your plate no doubt indicates.
>
> The last Air-Track ILS set that was developed is the AN/ARN-9.  It 
> included a 100 MHz glide slope receiver, but needed an external MF 
> localizer receiver.  This is the unnamed ILS that AN/ARC-5 manuals 
> mention.  Audio adapter panel MX-19/ARC-5 fits the R-23/ARC-5 and 
> connects it to J-32/ARN-9 as the ILS localizer receiver.  The R-23 and 
> R-24/ARC-5 receivers have a special AF output from the cathode of the 
> 12A6 that is filtered for the 90 and 150 Hz localizer AF signals to be 
> sent to the AN/ARN-9 through the MX-19.  The MX-19 also has a relay 
> selected by C-62/ARN-9 that places the R-23 in MCW mode for ILS 
> operation.  Other AN/ARN-9 components:
>
> C-62/ARN-9 Control Box
> ID-24/ARN-9 Cross-Needle Indicator
> J-32/ARN-9 System Junction Box
> MT-125/ARN-9 Mount for R-43
> MT-126/ARN-9 Mount for C-62
> MT-129/ARN-9 Mount for TS-72
> R-43/ARN-9 Glide Slope Receiver (100 MHz) and Converter
> TS-72/ARN-9 Test Oscillator
>
> The Air-Track ILS was hopelessly inferior in every aspect to the 
> USAAF's SCS-51 ILS, which used the RC-103-A VHF localizer receiver and 
> AN/ARN-5A UHF glide slope receiver to become the ILS that is still in 
> worldwide use today.  The USN appears to have abandoned Air-Track ILS, 
> the AN/ARN-9, and its ZA/ZA-1 predecessor by early 1944.
>
> While ZA/ZA-1 items and manuals are not rare, AN/ARN-9 components and 
> documentation are almost nonexistent today.  I've been looking for a 
> manual for more than 20 years.  The unique-use MX-19/ARC-5 is 
> uncommon, but not rare.  Anyone who runs across the odd MX-19 now 
> knows what it was supposed to do.
>
> Mike / KK5F
>
>     -----Original Message-----
>     From: Hubert Miller
>     Sent: Nov 3, 2017 12:58 AM
>     To: "milsurplus at mailman.qth.net"
>     Subject: [Milsurplus] " ZA Instrument Landing Check-Off List "
>
>     I found another of these metal nameplate-style instruction lists.
>     4 x 5 inches, screw holes at the corners for affixing inside your
>     Navy seaplane. Be sure to read all 15 steps in small print before
>     you let down!
>
>
>     This is available free, if you qualify by owning some of that
>     era's aircraft communications equipment.
>
>     -Hue
>
>
>
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