[R-390] Source for SS Cone Washers & Machine Screws
Craig Anderson Ext 1365
Craig.Anderson at saintpaul.edu
Wed Aug 23 08:32:28 EDT 2006
McMaster Carr is the place to go for the cone washers and countersink SS machine screws
http://www.mcmaster.com/
Craig W9CLA
-----Original Message-----
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Sent: Wednesday, August 23, 2006 3:03 AM
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Subject: R-390 Digest, Vol 28, Issue 25
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Today's Topics:
1. Re: Anyone interested in yet another R390A crystal list?
(dmartin)
2. Re: HP 3589A and HP 140T (Roy Morgan)
3. R-390 AGC Circuit (David C. Hallam)
4. R-390A front mounting panel hardware source? (Rbethman)
5. Re: HP 3589A and HP 140T (Barry Williams)
----------------------------------------------------------------------
Message: 1
Date: Tue, 22 Aug 2006 06:23:51 -0400
From: "dmartin" <dmartin at visuallink.com>
Subject: Re: [R-390] Anyone interested in yet another R390A crystal
list?
To: Tom Norris <r390a at bellsouth.net>, r-390 at mailman.qth.net
Message-ID: <20060822101228.M44306 at webmail.visuallink.com>
Content-Type: text/plain; charset=iso-8859-1
Nice job, Tom.
About two years ago I got written quotes via e-mail from International Crystal for all
of the 390A crystals. As you have said, simply providing them with the CR-series
designator and frequency was all they needed. At that time, any of the 15 CR-36/U
crystals were $24.95, the 17.000 meg CR-27A/U was also $24.95, the 200.000 kHz CR-47/U
was $85.54, and the 455 kHz CR-45/U was $85.54. For perspective only, this would have
made a complete re-crystaling a nearly $600 undertaking! I suppose an a la carte
selection of one or two specific crystals, as needed, wouldn't be a bad deal, assuming
Fair Radio and other usual sources of used crystals were unavailable.
Again, this quote was 2-3 years ago so today it would likely be more.
73
Dan
WB4GRA
---------- Original Message -----------
From: Tom Norris <r390a at bellsouth.net>
To: r-390 at mailman.qth.net
Sent: Mon, 21 Aug 2006 19:49:25 -0500
Subject: [R-390] Anyone interested in yet another R390A crystal list?
> If anyone is interested in taking a look, I threw together a quick
> all-encompassing R-390A crystal list.
> This list cross references band position with crystal frequencies and
> oscillator out and is a bit easier to read, IMHO than the diagram in
> the y2k manual. This builds on Nolan's crystal list that gave the
> milspec information for the crystals.
>
> http://r390a.fernblatt.net/xtals_390a.pdf
> http://r390a.fernblatt.net/xtals_390a.gif
>
>
------------------------------
Message: 2
Date: Tue, 22 Aug 2006 09:11:51 -0400
From: Roy Morgan <roy.morgan at nist.gov>
Subject: Re: [R-390] HP 3589A and HP 140T
To: Barry Williams <ba.williams at charter.net>, R-390 at mailman.qth.net
Message-ID: <6.0.0.22.2.20060822084415.04a60280 at mailserver.nist.gov>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 08:00 PM 8/21/2006, you wrote:
>Has anyone used either of these units as a spectrum analyzer for HF or MW?
>I recall someone using these and am hoping that someone can let me know
>how to use them, if they are worth using, etc.
Barry,
I've used the HP 8601A sweeper for aligning the Central Electronics
wideband transmitters (as helper to W0YVA, who has the sweeper and is good
at overhauling these things). The 8601A covers from 100 kc up to
110mc. It's small, pretty easy to use compared to other larger HP units,
but fairly hard to find because it's so useful and easy to use.
Of course a sweep generator plus a scope (and detector if needed) comprise
a rudimentary spectrum analyzer system without some of the things a real
spectrum analyzer does well.
I have a fancier, bigger sweep generator, the HP-8690B, that normally is
found with microwave sweep heads plugged into it. Luckily, the hard to find
low frequency plug-in is the one I have. This thing has a slide rule
readout the width of the unit, which is rack wide and 10-1/2 inches
tall. It's moderately complicated to use and somewhat confusing. It's
also a bear to fix if something is wrong with it.
The HP 3300A is a function generator, but with the right plug-in it will
sweep 50/80 kc IF's just fine. Actually, it goes from 0.01 Hz to 100
kHz. This is an older thing that may be available for not much money. The
needed sweep plug in is the 3305A. If you find a frame with a blank panel
or another plug-in, it may be possible to get your scope sweep output to
sweep the thing in a remote control mode. If you can buy one at moderate
price, don't pass it up. It will do all you need to align IF strips under
100 kc.
Roy
- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
NEW: 13033 Downey Mill Road
Lovettsville, VA 20180
Phone 540-822-5911
Cell 301-928-7794
Work: Voice: 301-975-3254, Fax: 301-975-6097
roy.morgan at nist.gov --
Old address: 7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828
------------------------------
Message: 3
Date: Tue, 22 Aug 2006 11:45:32 -0400
From: "David C. Hallam" <dhallam at rapidsys.com>
Subject: [R-390] R-390 AGC Circuit
To: "R-390 at mailman. qth. net" <R-390 at mailman.qth.net>
Message-ID: <FAEILKLJLEEAGLJFOKEPOEPOCHAA.dhallam at rapidsys.com>
Content-Type: text/plain; charset="iso-8859-1"
I see there is a November 2001 ER article about the AGC circuit in the
R-390A. Does this have any applicability to my R-390? I believe I have AGC
problems.
David
KC2JD
------------------------------
Message: 4
Date: Tue, 22 Aug 2006 17:23:32 -0400
From: Rbethman <rbethman at comcast.net>
Subject: [R-390] R-390A front mounting panel hardware source?
To: r-390 <r-390 at mailman.qth.net>
Message-ID: <44EB75D4.20308 at comcast.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gang,
Now that Dave Medley (sp?) is out of the "biz, whom is a current
supplier of the stainless screws and "cone" washers?
I've been working off (mostly!) and on for three or four years on a St.
J's massacre Collins built R-390A. It does have a Cosmos PTO though.
I have an engraved panel that I'm painstakingly hand painting the
engraving on.
Just about time to start re-assembly. FINALLY!
Thanks in advance!
You can reply direct if you think it will only clutter up the list.
Bob - N0Dumb Georgia Nut! (N0DGN)
--
Bob Bethman - NØDGN
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| BC-61ØI w/BC-614I, T-213/GRC-26 w/BC614I '51 Collins R-390A |
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------------------------------
Message: 5
Date: Tue, 22 Aug 2006 19:53:15 -0500
From: Barry Williams <ba.williams at charter.net>
Subject: Re: [R-390] HP 3589A and HP 140T
Cc: R-390 at mailman.qth.net
Message-ID: <44EBA6FB.4090808 at charter.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Roy and Dave,
The 3589 was a typo and should have said 3580. I was thinking of the
140A with 8555 and 5520 for frequency band analyzing, as like a
panadapter. At one time, some of these units were somewhat cheap. It's
been a couple of years since I was interested in this and I found the
pics of these units yesterday on an old computer. The pic of the 3580 is
from the *bay place where it was shown being used for that function. I'm
not sure at this moment whether I would want to use either of these
units with a R-390A or a HP 3586B....or with both.
I don't remember the comments that seller had regarding IF inputs, etc
on the 3580A. I corresponded with him until the auction price went too
high for me. I'll probably want to use one some of the time for MW/LF on
the 3586A as that area is crowded.
Sorry to not have mentioned this earlier. BTW, how are you doing up
there Roy?
Barry
>
> Barry,
>
> I've used the HP 8601A sweeper for aligning the Central Electronics
> wideband transmitters (as helper to W0YVA, who has the sweeper and is
> good at overhauling these things). The 8601A covers from 100 kc up to
> 110mc. It's small, pretty easy to use compared to other larger HP
> units, but fairly hard to find because it's so useful and easy to use.
>
> Of course a sweep generator plus a scope (and detector if needed)
> comprise a rudimentary spectrum analyzer system without some of the
> things a real spectrum analyzer does well.
>
> I have a fancier, bigger sweep generator, the HP-8690B, that normally
> is found with microwave sweep heads plugged into it. Luckily, the hard
> to find low frequency plug-in is the one I have. This thing has a
> slide rule readout the width of the unit, which is rack wide and
> 10-1/2 inches tall. It's moderately complicated to use and somewhat
> confusing. It's also a bear to fix if something is wrong with it.
>
> The HP 3300A is a function generator, but with the right plug-in it
> will sweep 50/80 kc IF's just fine. Actually, it goes from 0.01 Hz to
> 100 kHz. This is an older thing that may be available for not much
> money. The needed sweep plug in is the 3305A. If you find a frame
> with a blank panel or another plug-in, it may be possible to get your
> scope sweep output to sweep the thing in a remote control mode. If
> you can buy one at moderate price, don't pass it up. It will do all
> you need to align IF strips under 100 kc.
>
> Roy
I know the 141T, not the 140T. If the latter is not
a storage mainframe, it's much less desirable for spectrum
analyzer service than the 141T. You wouldn't be able to
use the narrow resolution bandwidths, because they require
a slow sweep.
That's just the scope frame. You
plug into it an 8552A or -B IF module
and an 8553L, -A, or -B RF module. I'm familiar with
the 8553B and both 8552's. The 8552B adds tighter
resolution bandwidths, better stability (required to
utilize said bandwidths), a "manual scan" mode, and
a 2dB log mode to supplement the standard 10dB log mode.
None of this is necessary for aligning our favorite radio,
but it's sure fun, and stuff of this vintage is not
expensive. Beware that they're old enough to have
developed their own problems. Unless you buy one
that's known-good (and maybe not even then!) don't
expect it to work without some sleuthing.
For measuring filter bandpass, you'll want a tracking
generator to go with the SA. It'll be an 8443A or -B.
(Or an 8601A with Option <mumble> if the RF is an 8553L.)
In this case the -B is not an improvement; it's an -A
with the frequency counter section removed. Early 8443A's
have nixie displays, which are cool in their own right.
Late ones have LED displays and interact more smoothly
with the SA, provided it's using an 8552B or a high-S/N 8552A.
The cable that interconnects these two is rare. You can buy
a made-up one from glkinst.com for 100-some bucks or make your
own ugly but functional one for 1/4 to 1/2 that. You will
probably have difficulty finding a parts guy who recognizes
the connectors.
HTH,
------------------------------
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