[ARC5] Latest aquistion

[Mike Morrow]

Unfortunately, that's a configuration that was not at all useful in military service.  The three receivers in a MT-65/ARC-5 in a single-seat carrier-based aircraft would typically have been:

1. R-4*/ARR-2 VHF ZB-Homing, 6 Selectable MF Modulation Channels
2. R-25, R-26, or R-27/ARC-5, MF/HF Lock-Tuned Fixed Frequency
3. R-28/ARC-5 VHF 4-Channel Crystal Control

C-38*/ARC-5 is the receiver control box for ALL of the above receivers except for VHF channel selection which is performed on transmitter control box C-30A/ARC-5.

These three receivers provided VHF Homing with six MF modulation channels, one-channel of MF/HF reception, and four channels of VHF reception.  That's much more capability from three receivers than available from the earlier ARA/ATA and SCR-274-N three-receiver sets.

The R-23*/ARC-5 served no purpose on carrier-based aircraft.  In addition to aviation beacon band reception (not especially useful for aircraft operating from a carrier), it was designed with the MX-19/ARC-5 audio adapter panel to be the localizer receiver for the AN/ARN-9 Air-Track ILS system for land-based patrol aircraft.  Air Track ILS was abandoned before 1944 in favor of the far superior USAAF SCS-51 ILS (RC-103-A localizer, AN/ARN-5* glide slope).

The R-24/ARC-5 had really only one function for use with the AN/ARR-1 VHF Homing Adapter.  The more capable and compact AN/ARR-2 ZB Homing Receiver made the R-24 and the AN/ARR-1 obsolete.  It is doubtful that earlier homing combo was ever deployed.

Mike / KK5F

-----Original Message-----
From: MARK DORNEY <mkdorney at aol.com>
Sent: Apr 18, 2023 5:53 PM
To: Bart Lee <bart.lee.k6vk at gmail.com>
Cc: ARC-5 List <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Latest aquistion

3 different Navigational Receivers in a 3 Receiver rack ? Interesting.  
Mark D. 
WW2RDO

&ldquo;In matters of style, float with the current. In matters of Principle, stand like a rock. &ldquo;.   -   Thomas Jefferson  
Sent from my iPhone


On Apr 18, 2023, at 6:48 PM, Bart Lee <bart.lee.k6vk at gmail.com> wrote:


i David,  
If Mark does not ask for the ARR-2 manual, we'd love to have it at the museum at the California Historical Radio Society (Alameda -- CHRS). We have an R-4A/ ARR-2 (see attached), and we'd like to have at least a copy of the manual. 
73 de Bart, K6VK ##
 










 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20230419/db2d853b/attachment-0001.html>