[ARC5] AN/ARC-5 R-23 Question

[Mike Kana]

I have a similar R23 that had plastic coated wires added and a few remaining cloth wires. One flower pot cap has a black insulating base but the cap shell has a solder lug and a black wire (to ground?)
The front had alameda NAS stenciled on the front and also a “test” identifier. 
It was partially modified when I got it - missing the dynamotor shock mounts and one of the if coils. 
I did replace a couple leaking flower pot caps in an effort to make operational. 
Does this sound similar to yours?
Thx 73
Mike

Warning!  This is transmitted over a non secure medium

> On Dec 21, 2023, at 8:30 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
> 
> 
> Back in August I picked up an R-23 Navigation receiver.   I was delighted to find this as I do NDB hunting and wanted to play with this receiver on the LF band a bit this winter.
> 
> Externally the radio was in nice shape with original connector on the back.   I removed the bottom cover and immediately saw modern wiring.  Lots of it.   Oh crud....
> 
> The first thing I did was to check the filaments and, as expected, they were wired for 12/14 volts.  No problem there.
> 
> The thing about the new wiring was that is was very nicely done, not your typical hack job you find in these radios.     I did some preliminary circuit tracing and it looks like some of the new wiring just replaced the old wires.     
> 
> I am using AN 16-30ARC-2 dated 15 Dec 1954 as my reference manual.   It is of course a copy from the web.
> 
> I note in my R-23 that C-30 is insulated from the chassis, and the capacitor case goes through a 100K resistor to ground.
> 
> In AN 1630ARC-2, Figure 6-3 (page 56) shows the underside of the radio.   It looks like C-30 is raised from the chassis – but since my manual is a copy,  all I see is black in that area.   Can any of you verify it is lifted / insulated from the chassis?
> 
> Also, at the top of C-30 are 4 resistors (R4, R9, R11, and R-27).  My R-23 has a 5th resistor in that group, and that 5th resistor is the 100K that goes from the case of C-30 to ground.    The 5th resistor is original – It wasn't added later.
> 
> My Figure 6-3 says it's of an early production set.  The schematics in the manual show the case of C-30 directly grounded, but I assume that is also for an early unit.  If any of  you have a different copy of the manual, can you check the schematic for this?
> 
> Thank you & 73
> 
> Mark K3MSB
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html