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

[Mark K3MSB]

Hi Mike

Yes, it sounds a lot like mine.   Photo attached.

Mark K3MSB

On Fri, Dec 22, 2023 at 12:15 AM Mike Kana <aa9il.radio at gmail.com> wrote:

> 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
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