[ARC5] BC 453 request

[Michael Hanz]

I'm afraid it's the other way around.  The loop switch covers are easy 
to find on junkers.  The loop switch knobs, not so much.

There were two different kinds of remote control knobs made for the loop 
switch.  One hails from the 1930's RU and SCR-183/283 sets, originally 
intended to switch dual band coil boxes, and repurposed as the 
C-25/ARC-5.  It requires a flex cable to connect it to the loop switch, 
shown below:


The other is a reconfigured ARC 6743, with a slimmed down knurl on the 
end with the spline drive and a smaller knob riveted on the outer end to 
turn the switch.  The knob is painted black, with an arrow engraved so 
that you can see which position it is in:


Both the C-25 and ARC 7491 are extremely rare.  You can make a 
serviceable replacement from either the RU or SCR-183/283 (MC-135) coil 
box switches, which are identical except for panel lettering and a 
square drive rather than the standard command set spline drive, which 
has to be substituted to convert the knob assembly. But then you have to 
attach the two ends with a flex cable.

The ARC 7491 can be fairly easily made by using the outline dimensions 
of the 6743 (with reduced knurled section dimensions to match the 
picture above) near the bottom of 
https://aafradio.org/garajmahal/flex_drive_cables.html - it attaches 
directly to the threaded fitting in the loop switch cover.  The black 
finish on the knurled knob is black lacquer.

          73,
  - Mike  KC4TOS

On 10/30/2019 5:27 PM, J Mcvey via ARC5 wrote:
> If anybody does have knobs for the loop switch, I could use a couple...
> The knobs are hard to find, but I imagine the cover is next to 
> impossible , unless you find a destroyed parts radio.
>
> On Wednesday, October 30, 2019, 5:21:40 PM EDT, Mike Morrow 
> <kk5f at earthlink.net> wrote:
>
>
> To some ham hobbyists hackers 60 years ago, but not to those for whom 
> the set's use in military service is THE important characteristic.
>
> If the request comes from someone attempting to assemble a 
> historically realistic three-receiver rack, he's not likely to care 
> about its use as a "Q-fiver".
>
> If the cover for the loop select switch is needed, then a small detail 
> like what model had such a thing would seem to matter, no?
>
> Mike / KK5F
>
>     -----Original Message-----
>     From: Bob via ARC5
>     Sent: Oct 30, 2019 1:24 PM
>     To: kk5f at arrl.net, martyn.seay at gmail.com, ARC5 at mailman.qth.net
>     Subject: Re: [ARC5] BC 453 request
>
>     They are all Q5ers
>
>     -----Original Message-----
>     From: Mike Morrow <kk5f at earthlink.net>
>     To: Martyn Google <martyn.seay at gmail.com>; ARC5 <ARC5 at mailman.qth.net>
>     Sent: Wed, Oct 30, 2019 9:37 am
>     Subject: Re: [ARC5] BC 453 request
>
>     > I’m hoping to restore a BC453 navigation receiver to complete a
>     3 rx rack. It’s the one with the 2 loop antenna terminals on the
>     front. It is missing the little black box that covers the loop
>     switch, and the switch knob. Will appreciate any help! Best 73 to all.
>     >Martyn ZL3CK (New Zealand)
>
>     Martin, there are no BC-453-* beacon band receivers with loop
>     terminals and switch.  Those were only on the very rare RAV
>     CBY-46002 and the common R-23*/ARC-5 and the less common
>     R-148/ARC-5X.  You almost certainly have an R-23*.
>
>     Good luck!
>
>     Mike / KK5F
>
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-- 
Michael Hanz - KC4TOS

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