[ARC5] R-23/ARC-5

[Michael Hanz]

I have found no radium-based paint on any of the AN/ARC-5 equipment with 
my AN/PRD-27F instrument.  Some of the engravings, however, are 
_photoluminescent_, and will glow under a UV light.  There are other 
spots on AN/ARC-5 equipment that have that same paint applied, such as 
the center dot on the remote control cranks, a "bar" line on the little 
switches, the radiused arrows on the volume controls, etc.  For some 
reason, none of the SCR-274 equipment has similar capabilities.

The only _aircraft_ instruments I have found with radiolumenescent 
markings have been meters, like the "Tune to Max" meter for the 
navigation receivers, and panel meters for temperature and the like.

Marine Corps sets seem to have taken the radiolumenescent approach far 
more than aircraft...perhaps because they did not have UV lights in 
their environment that was pervasive in aircraft.

  - - Mike  KC4TOS

On 2/28/2019 6:11 PM, Christopher Bowne wrote:
> Some of those remote control dial plates used radium paint markings IIRC.
>
> Sent from my iPhone
>
> On Feb 28, 2019, at 16:13, D C _Mac_ Macdonald <k2gkk at hotmail.com 
> <mailto:k2gkk at hotmail.com>> wrote:
>
>> The dial goes onto the remote receiver tuning unit and will track the 
>> front panel frequency dial if properly set up.
>>
>> The adaptor is used for local tuning of the receiver.
>>
>> 73 de Mac, K2GKK/5​
>> Since 30 Nov 1953​
>> Oklahoma City, OK​
>> USAF, Retired ('61-'81)​
>> FAA, Retired ('94-'10)
>>
>> ------------------------------------------------------------------------
>> *From:* arc5-bounces at mailman.qth.net 
>> <mailto:arc5-bounces at mailman.qth.net> <arc5-bounces at mailman.qth.net 
>> <mailto:arc5-bounces at mailman.qth.net>> on behalf of kg4kgl at gmail.com 
>> <mailto:kg4kgl at gmail.com> <kg4kgl at gmail.com <mailto:kg4kgl at gmail.com>>
>> *Sent:* Thursday, February 28, 2019 15:05
>> *To:* arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net>
>> *Subject:* [ARC5] R-23/ARC-5
>>
>> Good afternoon,
>>
>> I recently bought a somewhat hacked on R-23. My goal is to get it 
>> working as a Q5’er with a 12SA7 pentagrid converter frontend for 80 
>> and 40m. I also want to keep it looking as original as possible.
>>
>> I have schematic diagram in front if me and there is a part that 
>> installed that is not on the diagram. It looks like a ceramic wire 
>> wound resistor (grey in color) with USN markings. It is connected 
>> between pin7 of the 12k8 and the 12sk7 pin7 next to it. Is this a 
>> factory part?
>>
>>
>> Another question. The inside of the top access cover has a small dial 
>> on it and an adapter for the front tuning mechanism. What is the dial 
>> for?
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-- 
Michael Hanz - KC4TOS

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