[MRCA] MRCA Digest, Vol 119, Issue 13

[Al Klase]

Tom,

Here's the bottom of a J-47.  That's a J-37 on a base.  On the J-37 the 
holes in it's frame are tapped 6-32.

Get out your dividers.



Regards,
Al

On 3/11/2014 10:52 PM, Thomas Cook wrote:
> Hello Al and "Z",
> I talked to another ham and he informed me mike has a J-37, not a J-38.
> I am sorry I wasted anyone's time.
> Dimensions Center to Center for J-37 Please?
>
> Thanks for putting up with me,
>
> Tom
>
>
>
> > From: mrca-request at mailman.qth.net
> > Subject: MRCA Digest, Vol 119, Issue 13
> > To: mrca at mailman.qth.net
> > Date: Tue, 11 Mar 2014 19:42:43 -0400
> >
> > Send MRCA mailing list submissions to
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> > or, via email, send a message with subject or body 'help' to
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> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of MRCA digest..."
> >
> >
> > Today's Topics:
> >
> > 1. M and S report from Chickenland (B. Smith)
> > 2. ARC-5/SCR-274-N IF Coil Mod -Continued (D. Platt)
> > 3. J-38 mounting hole distance. (Thomas Cook)
> > 4. Re: J-38 mounting hole distance. (Al Klase)
> > 5. Re: J-38 mounting hole distance. (B. Smith)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 11 Mar 2014 12:40:34 -0400
> > From: "B. Smith" <smithab11 at comcast.net>
> > To: mrca at mailman.qth.net
> > Subject: [MRCA] M and S report from Chickenland
> > Message-ID: <531F3C82.4020705 at comcast.net>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Whew, sigs down today - - - .
> >
> > N3FRQ very readable bout S4. NN2K loud and clear. Switching back and
> > forth between the doublet and the 200 foot loop, the loop always 
> wins on
> > receive. When WA3EJT(call correct?) switched his antennas sigs here 
> came
> > up couple of S units. KK1K at the end was fairly loud.
> >
> > Z
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Tue, 11 Mar 2014 13:30:18 -0400
> > From: "D. Platt" <jeepp at comcast.net>
> > To: ARC5 at mailman.QTH.net, Military Radio Collectors Association
> > <mrca at mailman.qth.net>
> > Subject: [MRCA] ARC-5/SCR-274-N IF Coil Mod -Continued
> > Message-ID: <531F482A.5020202 at comcast.net>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Gentlemen,
> >
> > The plot thickens, as they say. I completed a second set of coils from
> > another similar receiver. The mechanical setup for securing the coil
> > bobbins and spacers was different on this one. Whereas the initial set
> > of coils used a long screw up through both coils and terminated at the
> > phenolic spacer bar with a nut, this second set has a shorter screw
> > coming down through the spacer bar and threaded into the lowermost
> > ceramic spacer. The screw coming from the bottom of the coil assy is a
> > short one and threads into the lowermost spacer. So, the procedure on
> > this one was a bit different.
> >
> > At this point, I'll assume that there are just two setups for securing
> > the coil bobbins. Both types use the same size and spaced ceramic
> > spacers. In this second type, it may be necessary to adjust either of
> > the two resonating caps such that the plates do not block access for 
> the
> > loosening of the securing screw (from the top). After clearing 
> access to
> > the screw, holding the lowermost spacer with a tiny long-nose or
> > hemostat, unscrew the securing screw from the spacer. Then, remove the
> > screw securing the spacer from the bottom of the coil assy.
> >
> > At this point, the lowermost spacer may be carefully jimmied out of the
> > coil assy. Using a soldering iron, heat and slide the wires going to
> > the lower coil down a bit to provide some slack. It may be necessary to
> > re-heat and re-solder these wires to ensure continuity. After providing
> > some slack in the wires, its possible to move the lower coil 
> downward to
> > provide the necessary increase in spacing. In my case, I inserted a
> > nylon washer between the bottom of the coil assy and the bottom of the
> > coil bobbin and added a dollop of epoxy to secure the coil bobbin. I
> > then added some epoxy to the top of this bobbin and to the top and
> > bottom of the upper coil bobbin as well as to the top of the securing
> > screw. Before adding epoxy to this screw head, ensure that it, and the
> > phenolic spacer bar, are down just far enough to keep clear of the two
> > resonating variable capacitors. When all's well, add a bit of epoxy to
> > secure everything. Also, be sure and check for continuity of each of
> > the coils bfore putting everything back together. So far, thiese mods
> > have genuinly helped with selectivity.....
> >
> > As I mentioned in the first posting of this procedure, after one does
> > the first coil set, the procedure is no big deal...... One needs not to
> > be a jeweler or surgeon.
> >
> > Does anyone think a submission to ER, probably with photos, might be
> > informative?
> >
> > Jeep - K3HVG
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Tue, 11 Mar 2014 16:29:59 -0500
> > From: Thomas Cook <kc7rjt at msn.com>
> > To: mrca <mrca at mailman.qth.net>
> > Subject: [MRCA] J-38 mounting hole distance.
> > Message-ID: <SNT150-W98E7632E3214DEDE9C95696770 at phx.gbl>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hello all,
> > I have a blind friend with a J-38 and he needs it mounted on a plate.
> > I made the plate but I need the distance center to center for 
> drilling and tapping
> > the plate.
> >
> > I'd ask him, but i'm trying to surprise him with it.
> >
> > Can anyone provide me the dimensions?
> >
> >
> > Thanks and 73 de Tom KG5AJP
> >
> >
> >
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> > ------------------------------
> >
> > Message: 4
> > Date: Tue, 11 Mar 2014 19:33:07 -0400
> > From: Al Klase <ark at ar88.net>
> > To: mrca at mailman.qth.net
> > Subject: Re: [MRCA] J-38 mounting hole distance.
> > Message-ID: <531F9D33.3010207 at ar88.net>
> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> >
> > Hi Tom,
> >
> > I repeatedly measure 1.550", but I'm concerned that the "design
> > dimension" might have been 1 9/16, 1.625". Holes are tapped 6-32.
> >
> > YMMV
> >
> > 73,
> > Al
> >
> > On 3/11/2014 5:29 PM, Thomas Cook wrote:
> > > Hello all,
> > > I have a blind friend with a J-38 and he needs it mounted on a plate.
> > > I made the plate but I need the distance center to center for 
> drilling
> > > and tapping
> > > the plate.
> > >
> > > I'd ask him, but i'm trying to surprise him with it.
> > >
> > > Can anyone provide me the dimensions?
> > >
> > >
> > > Thanks and 73 de Tom KG5AJP
> > >
> > >
> > >
> > >
> > > ______________________________________________________________
> > > MRCA mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/mrca
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:MRCA at mailman.qth.net
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> >
> > --
> > Al Klase -- N3FRQ
> > Jersey City, NJ
> > http://www.skywaves.ar88.net/
> >
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> > ------------------------------
> >
> > Message: 5
> > Date: Tue, 11 Mar 2014 19:42:35 -0400
> > From: "B. Smith" <smithab11 at comcast.net>
> > To: Thomas Cook <kc7rjt at msn.com>, mrca at mailman.qth.net
> > Subject: Re: [MRCA] J-38 mounting hole distance.
> > Message-ID: <531F9F6B.8060909 at comcast.net>
> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> >
> > There were several companies that made the J-38 so different
> > measurements might exist.
> > I assume he is keeping the original Bakelite mount? Or is he
> > mounting just the metal key portion to a plate. Let me know I will keep
> > the J-38 handy.
> >
> > Z
> >
> > On 3/11/2014 5:29 PM, Thomas Cook wrote:
> > > Hello all,
> > > I have a blind friend with a J-38 and he needs it mounted on a plate.
> > > I made the plate but I need the distance center to center for 
> drilling
> > > and tapping
> > > the plate.
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> > ------------------------------
> >
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> >
> > End of MRCA Digest, Vol 119, Issue 13
> > *************************************
>
>
> ______________________________________________________________
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-- 
Al Klase -- N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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