[R-390] R-390 Digest, Vol 131, Issue 1
Pete Williams
jupete at internode.on.net
Tue Mar 10 06:58:51 EDT 2015
Delivery....the list.... apropos my last,got a digest today March 10.
Dates on the entries in this digest Feb 26....... again, what gives ?
Pete VK3iZ
On Tue, Mar 10, 2015 at 5:14 PM, <r-390-request at mailman.qth.net> wrote:
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> Today's Topics:
>
> 1. Re: This may be of help to someone (Richard Loken)
> 2. Re: This may be of help to someone (Bob Young)
> 3. Re: This may be of help to someone (Norman Ryan via R-390)
> 4. Re: This may be of help to someone (Roger Ruszkowski)
> 5. Re: This may be of help to someone (David Wise)
> 6. What's happened .......? (Pete Williams)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 26 Feb 2015 12:27:56 -0700 (MST)
> From: Richard Loken <richardlo at admin.athabascau.ca>
> To: Bill Abate <wabate at verizon.net>
> Cc: R-390 <R-390 at mailman.qth.net>
> Subject: Re: [R-390] This may be of help to someone
> Message-ID:
> <Pine.PMDF.4.44L.1502261226010.1092-100000 at admin.athabascau.ca>
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> Karamba!
>
> I am quite impressed. I fear that I would have given up long before
> getting
> to the long screw piercing the wiring harness... I would have jammed out
> about the time I found the soldered gear moving on its shaft.
>
> --
> Richard Loken VE6BSV, Unix System Administrator : "Anybody can be a
> father
> Athabasca University : but you have to earn
> Athabasca, Alberta Canada : the title of 'daddy'"
> ** richardlo at admin.athabascau.ca ** : - Lynn Johnston
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 26 Feb 2015 16:33:48 -0500
> From: Bob Young <bobyoung53 at hotmail.com>
> To: "r-390 at mailman.qth.net" <r-390 at mailman.qth.net>
> Subject: Re: [R-390] This may be of help to someone
> Message-ID: <BLU177-W40BE3C01B0C623555A7D2DCC140 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Yes, very impressive and inspiring,
>
> Bob Young
> KB1OKL
>
> > Date: Thu, 26 Feb 2015 12:27:56 -0700
> > From: richardlo at admin.athabascau.ca
> > To: wabate at verizon.net
> > CC: R-390 at mailman.qth.net
> > Subject: Re: [R-390] This may be of help to someone
> >
> > Karamba!
> >
> > I am quite impressed. I fear that I would have given up long before
> getting
> > to the long screw piercing the wiring harness... I would have jammed out
> > about the time I found the soldered gear moving on its shaft.
> >
> > --
> > Richard Loken VE6BSV, Unix System Administrator : "Anybody can be a
> father
> > Athabasca University : but you have to
> earn
> > Athabasca, Alberta Canada : the title of
> 'daddy'"
> > ** richardlo at admin.athabascau.ca ** : - Lynn Johnston
> >
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 26 Feb 2015 21:49:55 +0000 (UTC)
> From: Norman Ryan via R-390 <r-390 at mailman.qth.net>
> To: Steve Toth <stoth47 at yahoo.com>, Bill Abate <wabate at verizon.net>,
> R-390 <R-390 at mailman.qth.net>
> Subject: Re: [R-390] This may be of help to someone
> Message-ID:
> <389909009.1218069.1424987395556.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> Hi, Bill,
> This is an exceptionally well written and informative post. ?There's never
> a need to apologize for its length, considering the complex topic. ?Please
> feel to write again.
> vy 73Norman
>
> ------------------------------
>
> Message: 4
> Date: Fri, 27 Feb 2015 11:29:35 -0500
> From: Roger Ruszkowski <flowertime01 at wmconnect.com>
> To: stoth47 at yahoo.com, wabate at verizon.net, R-390 at mailman.qth.net
> Subject: Re: [R-390] This may be of help to someone
> Message-ID: <14bcbdf29f5-66d4-9617 at webprd-m54.mail.aol.com>
> Content-Type: text/plain; charset=utf-8
>
>
> Bill,
>
> Thank you for taking the effort to repair this receiver.
> Nice to hear that another receiver is operational again.
>
> Roger Ruszkowski AI4NI
>
>
> -----Original Message-----
> From: Steve Toth via R-390 <r-390 at mailman.qth.net>
> To: Bill Abate <wabate at verizon.net>; R-390 <R-390 at mailman.qth.net>
> Sent: Thu, Feb 26, 2015 3:02 pm
> Subject: Re: [R-390] This may be of help to someone
>
>
> BillGood job at logically overcoming a compound problem - especially the
> extra
> long RF assembly mounting screw piercing the wiring harness! - Steve
> "Always
> look for a positive solution then Improvise, Adapt, and Overcome"
> A veteran -
> whether active duty, retired, National Guard or Reserve - is someone who,
> at one
> point in his or her life, wrote a blankcheck made payable to "The United
> States
> of America" for an amount of "up to and including my life."
>
> From: Bill
> Abate <wabate at verizon.net>
> To: R-390 <R-390 at mailman.qth.net>
> Sent: Thursday,
> February 26, 2015 10:56 AM
> Subject: [R-390] This may be of help to someone
>
>
> After repairing and aligning (I dislike the word 'restoration') four
> other
> R-390A's I thought another would be no biggie. I bought my fifth
> a few years
> ago at a great price and then put it on the shelf for a
> future project after
> doing some cleaning and degreasing. Recently I ran
> out of 'round to's and
> remembered the 390A. After a power up with no
> smoke I put in the missing tubes
> and connected a speaker. Zipo!
> Nothing! A close inspection showed that the
> megacycle knob did not turn
> all the related gears. A gear clamp was broken.
> Darn! Now I had to
> mess with the gear train to get at that clamp. Even worse,
> a magnifying
> glass and flashlight showed six more broken clamps!
>
> After hours
> of machine work I fabricated some replacement clamps. I
> replaced the clamps
> and reassembled the gear train. Darn, the gears
> were still slipping. Turns
> out the gear (#48) was slipping but the
> clamp was tight. Removed the gear and
> found the hub to gear connection
> was a cold solder joint. Yes, its called out
> in the military manual as
> a soldered gear (its not tin/lead solder). Did not
> expect that! I was
> worried about the heat damaging the gear if I tried to
> resolder it since
> it is tempered steel but I could not come up with a better
> idea. I dug
> out my low temperature silver solder and oxyacetylene torch. The
> gear
> repair turned out well. I did not give it a complete fillet as original
>
> since I wanted to keep the heating time to a minimum. The gear did warp
>
> slightly despite being tacked in just two places but it still was
> usable.
> Evidently the gorilla who worked on the gear train before me
> kept tightening
> the clamps until they broke when he could not stop the
> gears from slipping.
> Brawn instead of brains!
>
> Next problem was to synchronize the gear train. When
> the broken clamps
> allowed some of the gears to slip on their shafts it became a
> giant
> Rubik's Cube. I never felt the need to disassemble a gear train before
>
> so this was all new to me. I set the cams where they belonged at 7 +000
> but
> then found out the bandswitch was not synchronized. I found the
> section on
> synchronizing the 6 position RF bandswitch that showed you
> get a 56K resistance
> between two points (page 110 of TM 11-5820-358-35)
> when at 7 +000 setting. So
> I loosened the gear on the band switch shaft
> and rotated the switch shaft until
> I got the 56K reading and then an
> infinite reading when switched to 8 MHZ. You
> must satisfy both
> requirements. When that got satisfied I reassembled the rig
> but I still
> could not get the radio to align. Turns out there is more than one
>
> shaft position that satisfies the test. After studying the schematic it
> turns
> out the easiest way to synchronize the band switch is to look at
> the rear wafer
> and verify B+ to the 17 MHz oscillator when in the 00 to
> 07 positions. Finally
> got it right. After dropping the front panel and
> removing the RF subchassis
> more times than I care to admit, I found I
> still could not align the radio. I
> neglected to align the switch gear
> assembly (#87). I could not find explicit
> alignment instructions in the
> manual other than to use figure 68. I carefully
> positioned the bottom
> cogs with the vertical centerline of the gear and finally
> got the radio
> to align properly! It took me over a week to diagnose and fix
> these
> problems. Yeah, I'm slow.
>
> Thought I was done at this point but the
> audio did not sound right. It
> passed the tests for the AF module but it just
> wasn't right. Playing
> around with various settings I discovered that turning
> off the noise
> limiter made the audio louder and better. HUH? Found no B+
> getting to
> the noise limiter tube plates. Pulled the AF module and the
> switched
> RF-IF B+ was there but the line to the noise limiter switch was
>
> grounded. Could not find anything bad in the module so I disconnected
> the
> multiconnector plug and the ground disappeared. So it was in the
> wiring
> harness. Figured the switch on the noise limiter was bad. But
> it was fine.
> YUK! How do I find a short in the fully laced harness?
> Well dumb luck
> prevailed. When I moved the harness in a certain
> location, the ground
> disappeared. Turns out it was right next to the
> PTO. Now this might help
> someone. Somebody put an extra long screw
> through the frame that holds the RF
> assembly in place at that location.
> The harness is on the other side of that
> screw. Sure enough the screw
> pierced the wire insulation at that point and
> shorted that wire to
> ground! Replaced the screw with a shorter one and added
> some electrical
> tape and all is well.
>
> Sorry this got to be so long but it
> might help someone else. I could
> not find something similar on synchronization
> but if this has been
> covered before, my apologies.
>
> Bill,
> K3PGB
> ______________________________________________________________
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> mailing list
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>
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> list
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>
> ------------------------------
>
> Message: 5
> Date: Fri, 27 Feb 2015 09:46:01 -0800
> From: David Wise <David_Wise at Phoenix.com>
> To: Roger Ruszkowski <flowertime01 at wmconnect.com>, "stoth47 at yahoo.com"
> <stoth47 at yahoo.com>, "wabate at verizon.net" <wabate at verizon.net>,
> "R-390 at mailman.qth.net" <R-390 at mailman.qth.net>
> Subject: Re: [R-390] This may be of help to someone
> Message-ID:
> <FFF45F8A4E2B6F4CA4920B3B028CE73D154D464644 at SCL-ExchMB.phoenix.com
> >
> Content-Type: text/plain; charset=WINDOWS-1252
>
> Yep, the man did it with style.
>
> Dave
>
> ________________________________________
> From: R-390 [r-390-bounces at mailman.qth.net] On Behalf Of Roger Ruszkowski
> [flowertime01 at wmconnect.com]
> Sent: Friday, February 27, 2015 8:29 AM
> To: stoth47 at yahoo.com; wabate at verizon.net; R-390 at mailman.qth.net
> Subject: Re: [R-390] This may be of help to someone
>
> Bill,
>
> Thank you for taking the effort to repair this receiver.
> Nice to hear that another receiver is operational again.
>
> Roger Ruszkowski AI4NI
>
>
> -----Original Message-----
> From: Steve Toth via R-390 <r-390 at mailman.qth.net>
> To: Bill Abate <wabate at verizon.net>; R-390 <R-390 at mailman.qth.net>
> Sent: Thu, Feb 26, 2015 3:02 pm
> Subject: Re: [R-390] This may be of help to someone
>
>
> BillGood job at logically overcoming a compound problem - especially the
> extra
> long RF assembly mounting screw piercing the wiring harness! - Steve
> "Always
> look for a positive solution then Improvise, Adapt, and Overcome"
> A veteran -
> whether active duty, retired, National Guard or Reserve - is someone who,
> at one
> point in his or her life, wrote a blankcheck made payable to "The United
> States
> of America" for an amount of "up to and including my life."
>
> From: Bill
> Abate <wabate at verizon.net>
> To: R-390 <R-390 at mailman.qth.net>
> Sent: Thursday,
> February 26, 2015 10:56 AM
> Subject: [R-390] This may be of help to someone
>
>
> After repairing and aligning (I dislike the word 'restoration') four
> other
> R-390A's I thought another would be no biggie. I bought my fifth
>
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 10 Mar 2015 17:14:20 +1100
> From: Pete Williams <jupete at internode.on.net>
> To: r-390 at mailman.qth.net
> Subject: [R-390] What's happened .......?
> Message-ID:
> <CANZavbii6nXw6k3ycr39WRRkoJn4-efCM3rfTJYmN8coNA=
> C9A at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> ? What's happened to the R-390 list...... haven't had a signal for
> weeks.....checked my spam and trash files too.
> What gives ?
> Cheers
> Pete VK3IZ
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> R-390 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-390
>
>
> ------------------------------
>
> End of R-390 Digest, Vol 131, Issue 1
> *************************************
>
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