[R-390] RE: R-390 Digest, Vol 20, Issue 34
Craig Anderson Ext 1365
Craig.Anderson at saintpaul.edu
Thu Dec 15 08:30:58 EST 2005
The detailed drawing of the gear set is in the CD-ROM set that I have which includes the complete drawing set for the 390A. These could be digitized into an AutoCAD file. I actually did that with the front panel and had a CNC file created to reproduce the front panel. I have access to a 50,000 sq. ft. machine shop filled with 3 to 5 axis machining centers.
Craig W9CLA
-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of r-390-request at mailman.qth.net
Sent: Wednesday, December 14, 2005 5:24 PM
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Subject: R-390 Digest, Vol 20, Issue 34
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Today's Topics:
1. RE: 390/390a gear train (Craig McCartney)
2. Re: Am I missing something her4e? (mikea)
3. Re: Re: Topics to start (Y2K Addendum) (Joe Foley)
4. 600 to 8 ohm phone mod (Gene Dathe)
5. Re: Re: Topics to start (Y2K Addendum) (Barry Hauser)
6. Re: 600 to 8 ohm? phone mod (DJED1 at aol.com)
7. Re: 600 to 8 ohm phone mod (Gord Hayward)
8. RE: Re: Topics to start (Y2K Addendum) (Craig C. Heaton)
9. FW: F103/R390a (Jon)
10. R390A Small Knob (Jack Absalom)
11. RE: 390/390a gear train (Dan Merz)
----------------------------------------------------------------------
Message: 1
Date: Wed, 14 Dec 2005 06:34:18 -0800
From: "Craig McCartney" <craigmc at pacbell.net>
Subject: RE: [R-390] 390/390a gear train
To: <r-390 at mailman.qth.net>
Message-ID: <000a01c600bb$78579d50$6501a8c0 at CraigsDeskTop>
Content-Type: text/plain; charset="windows-1250"
If I recall correctly there is a detail drawing for each and every gear,
clamp and so forth on the R-390A drawing set CD. Been a while since I
looked at it though.
Craig
-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Joe Foley
Sent: Tuesday, December 13, 2005 7:07 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] 390/390a gear train
Hey, any chance anyone would like to do CAD drawings of the gears and cams?
Joe
--- Dan Merz <djmerz at 3-cities.com> wrote:
> Hi, the comments on reproducing the 390a radio raised a question in
> my mind. Does anyone have a dimensional drawing of the gear train in
> either the 390 or 390a? I'm interested in the dimensional
> layout/number of teeth of the gears in these radios. I have seen some
> of the drawings in the manual, Y2K and otherwise but I don't recall
> seeing anything that showed number of teeth, and placement of the
> gears dimensionally. I would like to attempt making a
> computer-displayed simulation of gear movement, cams, and cores, and
> the placement of gears would be useful.
> Or even a list of gears,
> size, number of teeth. I hate to have to take my radios apart to
> figure all this out. Any help will be appreciated finding the best
> available info on this aspect of the two radios, Dan.
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Message: 2
Date: Wed, 14 Dec 2005 09:28:39 -0600
From: mikea <mikea at mikea.ath.cx>
Subject: Re: [R-390] Am I missing something her4e?
To: r-390 at mailman.qth.net
Message-ID: <20051214092839.A3915 at mikea.ath.cx>
Content-Type: text/plain; charset=us-ascii
On Tue, Dec 13, 2005 at 05:42:48PM -0500, ToddRoberts2001 at aol.com wrote:
> In a message dated 12/13/2005 5:30:48 PM Eastern Standard Time,
> leslocklear at cableone.net writes:
> We could use two new bridges on the Mississippi Gulf Coast connecting the
> east and west ends of the coast across the bays of biloxi and st. louis.
> Price?
> Les
>
> Maybe if they named one of the bridges The R-390 Memorial Bridge they could
> find a buyer on eBay? 73 Todd WD4NGG
I suspect that if the bridge construction were done by a company named
"Collins" and the bridge were named "The R-390 Memorial Bridge", it'd
go _fast_ on the e-place.
--
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin
------------------------------
Message: 3
Date: Wed, 14 Dec 2005 09:50:22 -0800 (PST)
From: Joe Foley <redmenaced at yahoo.com>
Subject: Re: [R-390] Re: Topics to start (Y2K Addendum)
To: r-390 at mailman.qth.net
Message-ID: <20051214175022.21960.qmail at web30411.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
--- "W. Li" <wli98122 at yahoo.com> wrote:
> Here is one approach to the Y2K Addendum:
>
> Compile and organize by topic all the important
> areas
> such as "RF gear train rebuilds", "sensitivity and
> alignment" or "power supply" or "recap projects"...
> then go to the ver 2.0 of the exisitng Y2K
> publication
> and hotlink to each area in question (or insert a
> footnote about where to go in the Addendum).
>
> One underlying fact re maintenance procedures: they
> almost always break down to mechanical AND
> electrical.
> We could divide up each subject area into these
> basic
> components for clarity. We are often drawn to
> electrical because of our training and orientation;
> but we often neglect mechanical aspects as they are
> obvious to us, maybe not so to a newbie....
>
> OK here is my list on 'topics to start' (in order of
> preference)
>
> 1) basic electrical safety measures (not mentioned
> by
> Joe Foley's excellent piece)
++++++++=
I did think about that, such was left out on purpose.
I thought that the new owner should have training or
experience already in that area and that it wasn't the
purpose of this manual to train in that area. And I
didn't want the liability of it either. So I focussed
on the radio and kept it closer to the subject at
hand.
Joe
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------------------------------
Message: 4
Date: Wed, 14 Dec 2005 18:02:13 +0000
From: "Gene Dathe" <dathegene at hotmail.com>
Subject: [R-390] 600 to 8 ohm phone mod
To: r-390 at mailman.qth.net
Message-ID: <BAY101-F16453458198B0E3BDD1F87BA380 at phx.gbl>
Content-Type: text/plain; format=flowed
Question: I would like to plug in my Heil phones into the phone jack.
Are there any ready made plug in 600 to 8 ohm converters out there? Or; How
have you modified yours?
Thanks, Gene NAØG
------------------------------
Message: 5
Date: Wed, 14 Dec 2005 13:07:13 -0500
From: Barry Hauser <barry at hausernet.com>
Subject: Re: [R-390] Re: Topics to start (Y2K Addendum)
To: Joe Foley <redmenaced at yahoo.com>, r-390 at mailman.qth.net
Message-ID: <0a9001c600d9$361707a0$0d0aa8c0 at yourf95424bb04>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Joe has a good point there. It may not be a good idea to try to take the
total newbie into high voltage electronics. Instead, it might be better to
beef up the warnings and add a disclaimer if one isn't there already.
Barry
>>
>> OK here is my list on 'topics to start' (in order of preference)
>>
>> 1) basic electrical safety measures (not mentioned by Joe Foley's
>> excellent piece)
> ++++++++=
Joe wrote:
> I did think about that, such was left out on purpose.
> I thought that the new owner should have training or
> experience already in that area and that it wasn't the
> purpose of this manual to train in that area. And I
> didn't want the liability of it either. So I focussed
> on the radio and kept it closer to the subject at
> hand.
>
> Joe
>
> __________________________________________________
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>
------------------------------
Message: 6
Date: Wed, 14 Dec 2005 13:41:47 EST
From: DJED1 at aol.com
Subject: Re: [R-390] 600 to 8 ohm? phone mod
To: dathegene at hotmail.com, r-390 at mailman.qth.net
Message-ID: <26a.26b9c23.30d1c16b at aol.com>
Content-Type: text/plain; charset="US-ASCII"
I don't know if this made it into the "pearls of wisdom" but there is an easy
fix for the headphone impedance problem. The reason the low-Z phones don't
work well is that there is a 6800 ohm series resistor between the audio line
and the headphone jack. Thus 600 ohm phones divide the voltage a little, 8 ohm
phones drop the voltage a lot. However, you can parallel the resistor by
connecting another lower value resistor from terminal 6 to terminal 8 of the
audio terminal strip on the back. I used 470 ohms, but it can be adjusted to
suit your phones. Works good with my 8 ohm phones.
Ed
------------------------------
Message: 7
Date: Wed, 14 Dec 2005 13:53:38 -0500
From: Gord Hayward <ghayward at uoguelph.ca>
Subject: Re: [R-390] 600 to 8 ohm phone mod
Cc: r-390 at mailman.qth.net
Message-ID: <43A06A32.4010304 at uoguelph.ca>
Content-Type: text/plain; charset=us-ascii; format=flowed
I put a tiny 600-8 ohm transformer in a film can with appropriate plugs.
It seems to work well.
66 de Gord, VE3EOS
--
Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.
------------------------------
Message: 8
Date: Wed, 14 Dec 2005 12:18:49 -0800
From: "Craig C. Heaton" <wd8kdg at worldnet.att.net>
Subject: RE: [R-390] Re: Topics to start (Y2K Addendum)
To: "Barry Hauser" <barry at hausernet.com>, "Joe Foley"
<redmenaced at yahoo.com>, <r-390 at mailman.qth.net>
Message-ID: <MFBBKNJBIJAPALAMPCPMAEJNCGAA.wd8kdg at worldnet.att.net>
Content-Type: text/plain; charset="iso-8859-1"
In today's world of lawyer/sue happiness, beef up the warnings and
disclaimer! (First page in the addendum)
Craig,
-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Barry Hauser
Sent: Wednesday, December 14, 2005 10:07 AM
To: Joe Foley; r-390 at mailman.qth.net
Subject: Re: [R-390] Re: Topics to start (Y2K Addendum)
Joe has a good point there. It may not be a good idea to try to take the
total newbie into high voltage electronics. Instead, it might be better to
beef up the warnings and add a disclaimer if one isn't there already.
Barry
>>
>> OK here is my list on 'topics to start' (in order of preference)
>>
>> 1) basic electrical safety measures (not mentioned by Joe Foley's
>> excellent piece)
> ++++++++=
Joe wrote:
> I did think about that, such was left out on purpose.
> I thought that the new owner should have training or
> experience already in that area and that it wasn't the
> purpose of this manual to train in that area. And I
> didn't want the liability of it either. So I focussed
> on the radio and kept it closer to the subject at
> hand.
>
> Joe
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _____________________________________________________________
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>
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------------------------------
Message: 9
Date: Wed, 14 Dec 2005 16:58:55 -0500
From: "Jon" <jonklinkhamer at comcast.net>
Subject: [R-390] FW: F103/R390a
To: <r-390 at mailman.qth.net>
Message-ID: <MDBBIGOKDBHJANFFCODCCENGCFAA.jonklinkhamer at comcast.net>
Content-Type: text/plain; charset="iso-8859-1"
Just wanted to say thanks to the group on guiding me in the right direction
with respect to finding the problem with popping the fuse. It was a pinched
wire (BFO wire) aganist the frame of the IF module. As soon as the front
panel was taken off the short went away. A visual inspection solved the
mystery. Thanks again!!
73,Jon KB1DC
------------------------------
Message: 10
Date: Wed, 14 Dec 2005 16:12:38 -0500
From: Jack Absalom <kf4yio at charter.net>
Subject: [R-390] R390A Small Knob
To: R-390 at mailman.qth.net
Message-ID: <6.2.3.4.0.20051214161149.0319b580 at mail.charter.net>
Content-Type: text/plain; charset=us-ascii; format=flowed;
x-avg-checked=avg-ok-47B55BD
Hank:
I could use one of the small R390A knobs. Please let me know your email.
Jack kf4yio at charter.net
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------------------------------
Message: 11
Date: Wed, 14 Dec 2005 15:20:08 -0800
From: "Dan Merz" <djmerz at 3-cities.com>
Subject: RE: [R-390] 390/390a gear train
To: "'Craig McCartney'" <craigmc at pacbell.net>, <r-390 at mailman.qth.net>
Message-ID: <000301c60104$ecc02470$2e01a8c0 at DansDell>
Content-Type: text/plain; charset="US-ASCII"
Craig, I perused the various manuals that I've downloaded over a couple of
years and found an exploded view of the gears and connections to the cores,
with number of teeth indicated on each gear, but so far have found nothing
on dimensional layout of the shafts that go through the gears. Maybe this
kind of info never reached the public, or has not been found yet. Perhaps
it exists in an old file cabinet somewhere. The manual photos of the
front and rear of the rf deck could be used to extract the layout dimensions
using a reference dimension or two but I don't think all the shafts could be
located this way in the photos I've seen. The posted assembly of the rf
deck by Scott Seickel with all the steps documented would also be a good way
to put approximate locations on the shafts. I'm still wondering if anyone
has seen a set of engineering drawings of the gear assembly. It seems rare
to find original drawings used for the manufacture of any old radios. I
have a Westinghouse drawing for a 20's RC set, but I know the only reason
it made it out of the company was because some collector in the 50's wrote
to Westinghouse concerning the set and some staff member was kind of enough
to dig through files and send a copy of an original drawing. Unfortunately,
he did not include the mechanical layout drawings, which were probably in
the same file. Dan.
-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Craig McCartney
Sent: Wednesday, December 14, 2005 6:34 AM
To: r-390 at mailman.qth.net
Subject: RE: [R-390] 390/390a gear train
If I recall correctly there is a detail drawing for each and every gear,
clamp and so forth on the R-390A drawing set CD. Been a while since I
looked at it though.
Craig
-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Joe Foley
Sent: Tuesday, December 13, 2005 7:07 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] 390/390a gear train
Hey, any chance anyone would like to do CAD drawings of the gears and cams?
Joe
--- Dan Merz <djmerz at 3-cities.com> wrote:
> Hi, the comments on reproducing the 390a radio raised a question in
> my mind. Does anyone have a dimensional drawing of the gear train in
> either the 390 or 390a? I'm interested in the dimensional
> layout/number of teeth of the gears in these radios. I have seen some
> of the drawings in the manual, Y2K and otherwise but I don't recall
> seeing anything that showed number of teeth, and placement of the
> gears dimensionally. I would like to attempt making a
> computer-displayed simulation of gear movement, cams, and cores, and
> the placement of gears would be useful.
> Or even a list of gears,
> size, number of teeth. I hate to have to take my radios apart to
> figure all this out. Any help will be appreciated finding the best
> available info on this aspect of the two radios, Dan.
__________________________________________________
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