[Milsurplus] Re: [ARC5] ARC-5 Adapters MX-20

[Mike Morrow]

I wrote:

> I have been able to find *no* significant info on the ZA system.  It
> would be interesting for anyone with knowledge of the technical
> details of the ZA to make them known.

William wrote:

>                 Frequency Ranges
>          Glide Path Receiver - 90 to 98 mc.
>              (Modulated at 60 c.p.s.)
>            Localizer Signal Converter
>(Receives detected signal modulated at 90 & 150 c.p.s.)
>
>It pretty much works like the later ILS. 

Thanks, William, that's more than I knew.  

I assume it must have performed simply a "localizer" function, with out glide path info.   I was also curious about the physical characteristics and what relationship it had to other equipment:
 
(1) Was it an "adapter" that stole power from another set?
(2) Did it need a R-23 or -24/ARC-5 with the special ILS audio output and MX-19 to function (and thus could not be used with ARA receivers)?
(3) Did it feed a converted LF/MF RF signal to a R-23 or -24, and then did the R-23/24's MX-19 send a signal to an indicator unit?
(4)  Was the indicator similar to the I-101 used with the USAAF ILS?  The ID-29/ARN-9 indicator is simliar, but appears to display both localizer and glide path info.
(5)  Was the AN/ARN-9 just a later improved JAN equivalent of the ZA with glide slope info?
(6)  When was the USN's ILS abandoned and the USAAF's version adopted as world standard?

This is just a list of my main areas of interest.  I don't expect anyone can answer all of these questions.

Mike / KK5F