No subject

Thu Feb 21 15:38:05 EST 2013

me in my service work of R 390 series receivers.=20
Last Christmas my wife bought me a pair of DORKY looking reading glasses wi=
th LED's. She bought these from Walmart for about $10 and that included the=
 4 required coin batteries. I used them for some of the micro-controller bo=
ard work that my business also does but recently when rebuilding an IF deck=
 from a 390A, I tried them and WOW did that ever help.=20

My electronics lab is very well lighted and I have bench mounted lights on =
all of our benches with magni-viewers as well as florescent ceiling bulbs a=
bove every bench. The magni-viewers tend to get in the way for some jobs li=
ke digging DEEP into R390A IF modules.=20

You can buy a pair of these on ebay for under $5 and choose the diopter you=
 desire from 1.0 to 3.0.=20
The pair from Walmart  was 2.0 and these are perfect for me.
The LED's provide a lot of light, noticeable, even under 2) 4 foot long flo=
rescent bulbs over each of the 3) benches.

These are half height lenses that allow you to easily look over the lenses =
for normal viewing. If you are farsighted this will be frustrating but near=
sighted folks like me will benefit..

http://www.ebay.com/itm/Multi-Strength-LED-Reading-Glasses-Eyeglass-Spectac=
le-Diopter-Magnifier-Light-Up-/171044979589?pt=3DLH_DefaultDomain_0&var=3D&=
hash=3Ditem27d3134385

My pair uses CR1630 coin batteries and the pair on the provided link uses C=
R927. I bought 20 of the CR1630 cells for under $10 with free shipping. I d=
on't know if the 1630 and 927's are interchangeable. The fit is very tight =
in my pair. Here is a link for 26 of the CTR927's free shipping for about $=
5.

http://www.ebay.com/itm/25-CR927-DL927-ECR927-5011LC-Lithium-cell-battery-H=
appy-/261234429504?pt=3DUS_Single_Use_Batteries&hash=3Ditem3cd2c90e40

Typically, I use mine about 1 to 2 hours each work day and they last with v=
ery bright light for 2 to 3 weeks.=20

I hope this will help others who do tedious work too.

73,
Glenn WA4AOS
DSM Labs (dot com)=20

=20

=20

-----Original Message-----
From: r-390-request <r-390-request at mailman.qth.net>
To: r-390 <r-390 at mailman.qth.net>
Sent: Fri, Jun 21, 2013 8:18 pm
Subject: R-390 Digest, Vol 110, Issue 19

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Today's Topics:

   1. Re: Restoration questions (Roy Morgan)
   2. Re: June 2013 *Pearls* (wli)

----------------------------------------------------------------------

Message: 1
Date: Thu, 20 Jun 2013 13:44:58 -0400
From: Roy Morgan <k1lky at earthlink.net>
To: Barry <n4buq at knology.net>
Cc: r-390 at mailman.qth.net
Subject: Re: [R-390] Restoration questions
Message-ID: <2FD189C1-D469-4766-8B93-A4D6E45E072D at earthlink.net>
Content-Type: text/plain; charset=3Dus-ascii

On Jun 20, 2013, at 8:40 AM, Barry <n4buq at knology.net> wrote:

> That last detente is for an optional squelch circuit.

And there is or was a detent setting plate at the front of the detent part =
of=20
the switch to prevent the shaft from going to that position if the squelch=
=20
parts/system is not installed.  There are one or two blank plates on the IF=
=20
module if the mod is not installed.

>=20
> Sounds like the IF gain needs to be adjusted.  It's easy to set it too "h=
ot". =20
There should be info in the manual for setting it.

There is a simplified way to set the gain if you don't have the signal gene=
rator=20
and/or whatever else is called for in the manual:

IF GAIN SETTING

Here is Chuck's procedure:
From: http://www.R390A.com/html/gain.html>
Text in brackets [ ... ] is mine (Roy, K1LKY)
*********************
Procedure to set R390A IF Gain:

 Once the receiver has been fully mechanically and electrically aligned, th=
e=20
final procedure to perform before "buttoning it up" is to set the IF gain=
=20
control. [This means that you should have done the mechanical alignment - s=
et=20
the cams properly and so on.]
 Many otherwise very sensitive R390A's are thought not to be due to weak si=
gnals=20
being covered by noise generated by excess IF deck gain.

 Allow the receiver to warm up for at least 1 hour then:

 1- Terminate the antenna input [This means unhook any antenna and put a 50=
 ohm=20
resistor,or a 125 ohm resistor, on the balanced antenna input, no signals f=
rom=20
any antenna or signal generator.]
 2- Set receiver for 15.2 mHz
 3- Set the "FUNCTION" control to MGC
 4- Select the 4kc filter with the "BANDWIDTH"
 5- Set "RF GAIN" control to 10 or maximum [If your receiver goes whacko at=
 this=20
point, reduce the IF gain setting as in step 9 till it behaves right.]
 6- Peak the "ANTENNA TRIM" for maximum noise as indicated on the "LINE LEV=
EL"=20
meter [If you do not get a noticeable peak, your receivers front end and rf=
=20
amplifier stages are not working right.]
 7- Set "Line Meter" switch to -10db scale [mknus 10 db]
 8- Set "Line Gain" control to full CW or "10." [Local Audio gain 0 or low =
if=20
you are listening to it.]
 9- Adjust IF gain control, R-519 to cause "Line Level" meter to indicate=
=20
between -4 to -7 VU.
 10- Re-zero the carrier meter control, R-523
 11- Set controls above for normal operation and reconnect antenna

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!

------------------------------

Message: 2
Date: Thu, 20 Jun 2013 21:13:04 -0700 (PDT)
From: wli <wli98122 at yahoo.com>
To: R390a list <r-390 at mailman.qth.net>
Subject: Re: [R-390] June 2013 *Pearls*
Message-ID:
=09<1371787984.63454.YahooMailClassic at web125306.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=3Dus-ascii

It is now up for all.=20
Al kindly posted it for me.=20

W. Li

------------------------------

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End of R-390 Digest, Vol 110, Issue 19
**************************************

=20