Re: [Drakelist] TR5

[Tom Evans, AG9X]

Steve,

Yes, my TR-5 vfo operates backwards from my TR-7.  Clockwise decreases
frequency.

Tom, AG9X


On Wed, Mar 8, 2017 at 8:02 AM, Steve Cochrane  wrote:

> Thanks guys, I thought I remembered seeing somewhere a long time ago that
> it did operate backwards, but I wanted to make sure. I have two TR7s and a
> number of 4-line radios, but this is my first TR5. Nice little radio and it
> goes well with my other Drakes.
>
> Steve W7JSC
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Re: [Drakelist] drake tr7 repair

[Tom Evans, AG9X]

http://www.rldrake.com/support-repair.php



On Tue, Jul 23, 2013 at 10:19 PM, dave streight w5kow...@yahoo.com wrote:

 who does repair on the drake tr 7 radios??

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Re: [Drakelist] TR7 freq counting up

[Tom Evans, AG9X]

Sheldon,

That means the PLL is out of lock.  The most common cause is mild corrosion
on the card contacts.  Re-seating the cards will usually fix that problem
plus a few problems you haven't yet discovered.

Take care not to bump the pots on the right front.

Tom, AG9X



On Sun, May 19, 2013 at 11:05 AM, Sheldon Gofberg sgofb...@yahoo.comwrote:


 I've just acquired a TR7 that has full output and is functional on all
 bands except ten and fifteen meters.  On those bands, the displayed
 frequency starts at 51.xx and continues to count up.
 Not sure what's going on.  Anyone familiar with this condition?
 Thank you.  K3PNI. Sheldon
 Sent from my iPad
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Re: [Drakelist] Article by Garey K4OAH

[Tom Evans, AG9X]

All,

Sorry for the confusion.  If anyone fails to get a copy, please email me
off-list and I'll do waht I can to help you.

And while you're asking for back issues, the Feb 2012 issue has an article
about clandestine radio communications that I just had to share with the
XYL.  She found it fascinating, too.

73, Tom, AG9X




On Mon, Mar 26, 2012 at 4:07 PM, Jim Shorney jshor...@inebraska.com wrote:


 As did I, and I found a copy of the April issue in my email inbox within a
 few
 hours. Funny what you find out when you read the web page info  :)

 73

 -Jim

 On Mon, 26 Mar 2012 13:53:08 -0400, John Pelham wrote:

 At the bottom of this Web page (http://www.k9ya.org/index_telegraph.htm) it 
 says that back issues are available on request, with an email link. I
 sent an email asking for the April issue.


 --
 Ham Radio NU0C
 Lincoln, Nebraska, U.S.S.A.
 TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A,
 GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time!

 Give a man a URL, and he will learn for an hour; teach him to Google, and
 he will learn for a lifetime.

 HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
 http://incolor.inetnebr.com/jshorney
 http://www.nebraskaghosts.org



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[Drakelist] Article by Garey K4OAH

[Tom Evans, AG9X]

I downloaded my April issue of The K9YA Telegraph today and was happy to
find an article by Garey Barrell.
Titled 'Genesis,' part 1 tells of his getting started in ham radio.

The publication is available as a downloadable pdf that you can sign up for
here:
http://www.k9ya.org/k9ya_telegraph1.htm
Just click the 'Subscribe' button on the bottom left.

The article includes a photo of Garey's station today with a TR7 and R7
combo.

-Tom, AG9X
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Re: [Drakelist] double posts??

[Tom Evans, AG9X]

Bud,

I received just one copy of your email.  And the same with recent messages
from others.

Tom, AG9X



On Sun, Oct 2, 2011 at 11:04 PM, sebdesnCC sebd...@comcast.net wrote:

 Wonder if  its  my machine , I get most messages,from this list, in groups
 of 2 that are identical,and sent at the same time..Is this supposed to be
 that way ,or have I just noticed it???

 Tnks ,,Bud W0 HG


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Re: [Drakelist] Sign on

[Tom Evans, AG9X]

Dave,

At   http://mailman.zerobeat.net/mailman/listinfo/drakelist
it says Once a month, your password will be emailed to you as a reminder.

Ask your friend to search his email for an email with this Subject:
zerobeat.net mailing list memberships reminder

The last one was sent on Sept 1, 2011

If your friend doesn't find an email like that, he can always sign up for
the list again at the link above.


73, Tom, AG9X



On Mon, Sep 12, 2011 at 7:17 PM, Dave Loewer wb2...@msn.com wrote:

   Hi Gang :  I have a friend that wants to sign on and ask for help.
 Drakelist asked for his name and pass word and he can’t
 remember it. What can he do ? I don’t know what to tell him
 Thanks a lot
 Dave  W2GBY

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Re: [Drakelist] R-7 SSB audio distortion

[Tom Evans, AG9X]

Jose,

I experienced the same problem with my TR-7.  I de-tuned the last IF
transformer a little and things improved.

My 2nd IF/Audio board uses a diode bridge.  I wish I had the MC1496 product
detector.

73,
Tom, AG9X




On Sat, Sep 3, 2011 at 3:47 PM, Jose V. Gavila eb5...@amsat.org wrote:

 Hi all,

 I am working on a nice R-7 receiver and have found that it distorts in SSB
 on the first word syllable. It is lots worse on M and F AGC settings, but
 also noticeable in slow setting.

 Any hint to solve this problem?. An AGC mod perhaps?

 Thanks and best regards,

 JOSE
 --
 73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN)
 Radio and Test Equipment... http://jvgavila.com
 RadioRepair BLOG... 
 http://radiorepair.blogspot.**comhttp://radiorepair.blogspot.com


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Re: [Drakelist] Basic electronics

[Tom Evans, AG9X]

Neil,

In a Class A amplifier a D.C. bias voltage is applied to the input grid
circuit.  This prevents the A.C. output signal from being rectified.

Since a Class A amplifier is the least efficient, other classes of
amplifiers are used for CW, FM, etc.

-Tom, AG9X


On Sun, May 1, 2011 at 4:23 PM, Neil M Califano cchange...@yahoo.comwrote:

 How does a tube amplify AC current if tubes are used to rectify current?

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Re: [Drakelist] Upgrade/Maintenance On All Email Accounts.

[Tom Evans, AG9X]

Be sure to ignore the message below requesting your email address and
password.

-Tom, AG9X



On Sun, Jan 16, 2011 at 4:46 AM, Technical Support ab...@webmaster.orgwrote:

 Dear Email Users,

 Due to numerous complaints on ongoing recent spam activities on your
 account, vital maintainance will be conducted on our Email servers.

 To confirm and to keep your Email account active,a confirmation for
 ownership must be provided. Outline the information's below.Failure to do
 this might cause a permanent deactivation of your Email/Webmail account from
 our servers.

 Email Address:
 Password:

 Your account shall remain active after you have successfully confirmed your
 above requested informations. We apologize for any inconveniences caused as
 a result of this notification. We thank you for your prompt attention to
 this notification.

 Email Technical Support

 Copyright 2010 Email. All Rights Reserved.

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Re: [Drakelist] Kano Laboratories

[Tom Evans, AG9X]

My wife purchased Kroil to loosen her antique sewing machines.  It's sold
through Amazon.com.  8 oz can  $8.95 plus shipping.

Tom, AG9X


On Sun, Jan 16, 2011 at 10:52 AM, Bob Loving bob.lov...@sbcglobal.netwrote:

 James Barrie and all:

 I've used Kroil and SiliKroil in the past and it does wonders on frozen
 bolts, etc. I never thought of using it on a rusty chassis but if it works
 as well on a chassis as it does on bolts, it's a winner.

 There is one point with purchasing any porduct from Kano Labs. Namely their
 disclaimer in the purchase agreement which I copied and pasted below:

 *ALL PRODUCTS PRODUCED AND DISTRIBUTED BY KANOLABS ARE FOR INDUSTRIAL USE
 ONLY AND ARE NOT INTENDED FOR RETAIL SALE, PERSONAL OR CONSUMER USE.*

 It appears, then, that you can't buy it over the counter but only from the
 company. The work around could be to use the name of your place of work but
 have it shipped to you In care of and your home address. If questioned,
 one answer could be, it's easier to get a petty cash reimbursement than to
 cut a PO! This is only a suggestion.

 K9JU



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Re: [Drakelist] Kano Laboratories

[Tom Evans, AG9X]

James,

Good question.  I haven't tried it on a rusty chassis yet, just rusty bolts.

If anyone's interested, you can order 2 aerosol cans for $12 delivered to
your company address.  Details here:
http://www.kanolabs.com/google/

-Tom, AG9X



On Sun, Jan 16, 2011 at 1:30 PM, James bar...@cinci.rr.com wrote:

If it will remove the rust from a chassis, what do you have left? A rust (
 or non-rust) pit in what color? What do you do next to make it look like the
 rest of the chassis?

 Sent via BlackBerry from T-Mobile


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Re: [Drakelist] Kano Laboratories

[Tom Evans, AG9X]

-- Forwarded message --
From: kendw...@netscape.com
Date: Sun, Jan 16, 2011 at 1:56 PM
Subject: Re: [Drakelist] Kano Laboratories


My forwarding to Drake list not working, apparently:  Please forward

Kano Labs direct order line # is 1-800-311-3374, ORDER DIRECT and pics of
master card, visa, PO (purchase order) logo. kano has several sites.

  I can also recommend from personal use, silikroil, Kreen, Microil, and
penefruf (rust preventive on steel, working great on exposed Greenard # 5
hand arbor press, and SB lathe, needing building this year for housing.

k
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Re: [Drakelist] Drake 1A Coil Slugs

[Tom Evans, AG9X]

Paul,

I took a look at the schematic and don't see slugs indicated for 20 - 10 M.
If they were originally present but now missing, I'm guessing you'd not be
able to peak the antenna trim cap for maximum band noise on those bands.

Hopefully someone with a 1A will respond.

-Tom, AG9X



On Sun, Jan 16, 2011 at 7:39 PM, Paul Christensen w...@arrl.net wrote

 Upon further investigation of the Drake 1A schematic, it appears the
 antenna coils are tuned to resonate with the antenna trim cap such that the
 trim cap is at mid range in the center of each respective band.  This is
 necessary on 80m and 40m, but spanning the band from edge-to-edge on 20m
 through 10m does not involve much change of the trim control.

 I'm beginning to think (perhaps wishfully?) that the slugs were never there
 in the first place.  Anyone have a Drake 1A that can take peek through the
 perforated cover?  Tnx!

 Paul, W9AC

 - Original Message - From: Paul Christensen w...@arrl.net
 To: drakelist@zerobeat.net
 Sent: Sunday, January 16, 2011 8:23 PM
 Subject: [Drakelist] Drake 1A Coil Slugs



  I recently acquired a Drake 1A receiver in nice condition except that
 three coil slugs are missing in the 20,15, and 10m antenna coils.  It
 appears Drake used the same slug and phenolic coil assembly for all coils in
 the 1A.

 I've seen these used a million times before: It's a round ferrite slug
 with a straight blade slot on one end of the ferrite core. The other end of
 the ferrite is attached to a long bass screw.  The mating phenolic coil form
 assembly is the type that just snaps into the chassis.

 I now it's a longshot, but anyone know a source?  Is it possible they
 simply were not used on the 20m-10m ant coils?

 Paul, W9AC

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Re: [Drakelist] Searching the List

[Tom Evans, AG9X]

Curt,

Go to the Drakelist home page athttp://www.zerobeat.net/drakelist/

Click on *The NEW Drake Mailing List
Archive*http://www.mail-archive.com/drakelist@zerobeat.net/

It will take you to mail-archive.com where there is a search box at the top.

-Tom, AG9X


On Mon, Nov 29, 2010 at 12:19 PM, Curt rhule...@comcast.net wrote:

 I'm wondering if there is a way to search the list by topic, short of going
 through the archive one month at a time.

 73, Curt KB5JO


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Re: [Drakelist] TR-7 Oscillating?

[Tom Evans, AG9X]

Dave,

Does the built-in TR-7 reflected power meter jump to infinity?

A couple troubleshooting suggestions:

Disconnect the antenna and feed the TR-7 directly into a dummy load.

Disconnect the mic and see if this happens on CW.

Good luck with it.

Tom, AG9X



On Sat, Oct 16, 2010 at 9:19 AM, K8JDC k8...@sbcglobal.net wrote:
  Gents,

     My TR-7 started doing something unusual this morning.  I tried to check
 into a 40m phone net and I noticed my external VSWR meter going crazy.  It's
 a dual-needle type and I would start talking and things would be okay and
 then the reflected needle would instantly jump to infinity.  Unkey and try
 again and it would do the same...normal for a second or two and then a jump
 to infinity.  I think I saw the same behavior when I first got this radio
 and did the full alignment when adjusting the two big power output pots and
 it went into oscillation.  (I don't recall the exact names of those pots but
 I recall one was in the PA section and one underneath the radio.)  My radio
 seemed to be a little touchy to those adjustments and wanted to oscillate
 but all has been well for the last 18 months or so until this morning.  As
 luck would have it, I recently rebuilt my microphone cable, re-arranged my
 ham desk, and adjusted my antenna slightly so I've touched about everything
 but I can't find any evidence that I have any kind of flaky connection in
 the antenna as that was my first thought given the reflected power
 indication.  The problem is that the reflected needle just goes from zero to
 infinity and I think that's exactly what it did when it went into
 oscillation.  My VSWR meter uses an inline directional coupler arrangement
 (Palstar WM-150)on the input to the tuner.  The receive strength is rock
 solid and we have no wind whatsoever on the antenna today.  I tried reducing
 mic gain and so on but the problem still happens.  It doesn't necessarily
 make sense to me that oscillating would cause the VSWR needle to jump but
 I'm pretty sure this is what it did when I adjusted those pots about 2 years
 ago.  Thought I would check with the experts before dragging it out of the
 operating position and trying to adjust those pots.

 Thanks...

 Dave
 K8JDC

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Re: [Drakelist] TR7 dead receive

[Tom Evans, AG9X]

Paul,

Make sure there is continuity between the 'EXT RCVR' J4 to 'EXT ANT'
jacks.  If not, add a short jumper cable.

-Tom, AG9X


On Sun, Oct 10, 2010 at 1:27 AM, Drakedude draked...@comcast.net wrote:
 Took my TR7 that was in temp controlled storage for about one year and found
 I have no receive. Radio worked 100% when put away in closet.
 TX works fine,all modes,full output. I get meter deflection when I rotate RF
 gain control .
 I have very weak audio of TX signals,no meter deflection when a strong
 signal ( compared to another recvr same antenna)
 Filter selection works,as you cab  hear bandwidth narrow with narrow filter.
 PBT works good also.
 I removed relay  cleaned contacts to no avail.
 All voltages at 10 volts or slightly lower on reg. board.

 Any thoughts?

 Tnx in advance

 Paul AD3G

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Re: [Drakelist] TR-4C RCV / XVCR switch

[Tom Evans, AG9X]

Joe,

If the switch has not been abused, cleaning the contacts should
restore it to 100%.  A little bit of Caig DeOxit followed by
exercising the switch will probably remove any built up oxidation.

The RF Output issue could be soft final tubes or the driver tube.
Which band you're getting 65 W out?  Is that is into a dummy load?
How much output do you get on 80M vs 10M ?

73, Tom, AG9X



On Tue, Sep 7, 2010 at 7:58 PM, Joe Loverti joelove...@gmail.com wrote:
 Hello Drake List Members,

 I have a TR-4C w/ a few gremlins I'm trying to iron out. Was hoping
 someone may be able to point me on the right direction.

 The RCVR / XCVR switch on the lower left-hand side of tbd chassis is bad.
 Does anyone know of a scource for a replacement? I have to hold the switch
 just so or else the RX goes deaf.

 Secondly, I'm only able to coax about 65W out on TX. I've been following the
 instructions on pg 5-8 in the original manual? I'm only getting about .2-.3
 amperes of plate current once tuned up. The manual states I should be seeing
 around .4 ampreres.

 Any guidance would be much appriciated!

 Regards and 73,

 WS8X

 Joe


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Re: [Drakelist] Wiring SignaLink USB interface

[Tom Evans, AG9X]

Sanford,

Attached is an image of the pinout of the TR-7 Accessories socket.  It
confirms Don's comments.

-Tom, AG9X


On Thu, Jul 29, 2010 at 12:07 PM, Don Cunningham wb5...@martineer.net wrote:
 Sandy,
 That accessories jack is NOT designed for the use you want.  It is only
 for accessories like the RV7 or RV75 remote VFO's.  What you are doing now
 is probably the easiest way to use the TR7 for digital.  You can internally
 wire a shielded cable to the spare RCA jack on the back to the mic plug in
 the front (one of the changes to make the TR7 a 7A, hi) and use the
 speaker audio out in the rear if you like.
 73,
 Don, WB5HAK
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Re: [Drakelist] Tr-7 Display

[Tom Evans, AG9X]

Has anyone ever seen a TR-7 without a DR-7 ?  I've never heard of one.

Tom, AG9X


On Wed, Jul 7, 2010 at 12:00 AM, Kirk Smith n7...@yahoo.com wrote:
 Since the TR-7 uses both analog  digital displays, will it still function
 if the digital display/card were to go bad?


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Re: [Drakelist] Deoxit

[Tom Evans, AG9X]

I like the 100% concentration with the needle applicator.
DeoxIT® D100L D-Series Needle Dispenser, 100% solution, 25 ml

You only need a little bit and the sprays and brushes only encourage
you to use too much.

-Tom, AG9X


On Mon, Jun 28, 2010 at 6:04 PM, Charles Ring w...@roadrunner.com wrote:
 Looking to clean contacts on my Drake gear. Since there are many varieties
 of Deoxit, which one or more is best for this purpose?

 73 de W3NU

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Re: [Drakelist] L7 mod for 10 meters

[Tom Evans, AG9X]

That should have read:

The domestic L-7 without the 68 pf input capacitor acts a lowpass
filter on 15 Meters.  Adding the 68 pf on the input converted it to a
Pi bandpass
filter.

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Re: [Drakelist] Drake TR-7A problem.

[Tom Evans, AG9X]

Check the REF/FWD switch.  Push it in and out a few times and leave it in
the 'out' position.

73,
Tom, AG9X

On Sat, Dec 26, 2009 at 11:57 AM, Bent b...@post5.tele.dk wrote:

  Hello All

 First of all a Merry Christmas to all of you.

 I got a problem with my TR-7A.
 Output power is not more indicated on the meter.

 As indicated on my MN2000 it seems that there is full power available.
 But no power indication on the meter.

 Meter is working fine in receive mode.

 Are someone able to inform me what can be wrong ?

 Thanks in advance.

 Best regards

 Bent
 OZ5ZD

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Re: [Drakelist] TR7 Help please

[Tom Evans, AG9X]

Adrian,

There are two boards that are commonly found with a TR-7.  One is the board
needed to operate the rig when the DR-7 digital display board is removed for
testing or alignment.  It is labeled C3990W and is shown here:
http://incolor.inetnebr.com/jshorney/tr7ext.htm

The other is the board which is removed when the NB-7 noise blanker is
installed.  Early rigs shipped without the NB-7.  The later TR-7A included
the NB-7 board.  The NB-7 board itself is shown here:
http://www.dproducts.be/Drake_Museum/images/NB7color.jpg


Good luck,
-Tom



On Sat, Dec 12, 2009 at 3:27 AM, Adrian Rees (MW1LCR)
ree...@btconnect.comwrote:

 Hello everyone

 Thank you all for your replies, both on and off list.

 I'll start by stripping  cleaning the PC Board connectors, as per the many
 suggestions I received.

 Over here in the UK, we have a product called Servisol, which I guess is
 the
 same as your Dexoit. Both switch  contact cleaners.

 The guy I bought the TR7 from had started restoring the radio and had
 changed two transistors, before stopping work on it. These were two
 transistors are in the power supply section, specifically Q2104 and Q2105
 (TIP31).

 He had also acquired two spare boards for the radio, an IF Switching board
 and what appears to be a interstage RF amplifier, identified by the serial
 C3988W on the board.

 I'll clean the connectors and see what we have got then.

 Since it's a week or two before Christmas, and we live up in the hills, the
 XYL wants to go shopping, so its doubtful I'll achieve much on it today,
 although I may have time this evening, between contacts in the UBA Low Band
 contest which is on tonight  tomorrow morning.(I'm running my rebuilt
 FT102
  Dentron Linear for a bit of nostalgia !)

 Best wishes  many thanks !

 Adrian MW1LCR

 North Wales.



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Re: [Drakelist] Drake Tr7 with cw problem

[Tom Evans, AG9X]

Frank,
On 80 meters into a dummy load on CW you should get around 140 watts when
the ALC light just turns on.

As you go up in frequency the output will decrease.  On 10 meters, you
should get over 100 watts CW into a dummy load when the ALC light just
starts to turn on.

I wouldn't run any tests without a load.  The protective circuits will
reduce the output power to protect the final transistors.

There has not been a lot of talk about replacing the PIN diodes on the 2nd
IF / Audio board.  They are still available.

Good luck with the rig.
Tom, AG9X



On Mon, Oct 12, 2009 at 7:51 PM, Frank Vallance f_valla...@hotmail.comwrote:

  Hi folks, My Drake Tr7, s/n 3669, has the following problem: On ssb, 80
 mtrs, it puts out only 90 watts, alc light is not lit. nor for that matter
 on any other band. On cw, it puts out only 2 watts. When load
 is disconnected, alc comes on at 20 watts op. (ssb). On cw, alc light comes
 on at 2 watts o/p. Can anybody help. Further, is there a modern type
 replacement for CR1102, 5082 - 3379 which is located on the 2nd IF/ Audio
 board.

 Many thanks
 Frank
 VK4fus/p8

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[Drakelist] 4 Board set for TR-7 modifications

[Tom Evans, AG9X]

I have a copy of the 1992 Communications Quarterly article Improving the
Drake TR-7 by Scott Prather, N7NB

The features provided are

   - Full receive coverage from 10KHz to 30 MHz with no reduction in
   sensitivity across the entire range.


   - Smooth, quiet, full break-in (QSK) CW operation at full output power.


   - A major improvement in the S/N ration of weak CW signals.


   - A reduction in cooling fan noise, because the fan operates only when it
   is needed.


Along with the article  is a set of 4 circuit boards I purchased from Far
Circuits:

   - Front-end filter card


   - QSK card


   - Audio filter card


   - Fan control card


If you have any interest, please contact me off list.

Tom, AG9X
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Re: [Drakelist] tr7 turn on problem

[Tom Evans, AG9X]

Bob,

Sounds like the antenna relay to me.

To test that theory, attach a lead to the VLF Antenna input on the
rear Aux connector and see if signals get stronger.  That input
bypasses the antenna relay.  Be careful not to transmit with the VLF
Antenna attached.

I attached a picture of the Accessories socket pinout.  Pin 7 is the
VLF Antenna input.

There's a photo of the antenna relay here:
http://www.wb4hfn.com/DRAKE/DrakeArticles/InsideTheTR7/Inside_The_TR7-10.htm
in the 'Quiet Fan' mod section.

73,
Tom, AG9X



On Thu, Sep 17, 2009 at 6:02 AM, robert donchez wb3...@rcn.com wrote:
 hope someone can shed some light on this please
 am a reasonably new tr7 owner and love it- always wanted one back in late
 70's but couldnt afford it then.

 every once in a while my tr7 turns on and sensitivity, volume, and many
 hetrodynes- almost no receive any band--- turn it off, wait 10 seconds-
 starts up fine
 using it with the drake power supply
 any ideas where to start would be appreciated
 tnx
 bob donchez
 wb3hyb

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Re: [Drakelist] tr7 turn on problem

[Tom Evans, AG9X]

Jay,

Does this occur only in CW?

Early TR-7s required a mod to prevent them from waking up in transmit
when turned on in CW mode.  Perhaps that hasn't been done to yours.

The Pop mod was done to the 2nd IF/Audio board.  It connected R1112
to the +10R line instead of +10 CW line.  Also added a 1.5 K resistor
in series with CR1119.  I have a dog-eared copy of the Pop mod if
anyone wants a scan of it.

Tom, AG9X


On Thu, Sep 17, 2009 at 8:33 AM, GrampZ teamt...@roadrunner.com wrote:

 My TR-7 has some funny behavior at startup sometimes. The lights will blink
 for a split second and maybe a burst of noise and then it seems to shut
 down. The fan is still running but nothing else. At times, I've had to turn
 it on/off/on several times to get it to start up properly. My first W.A.G.
 is that some sort of protection circuit is getting tripped.

 Jay
 SoCal


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Re: [Drakelist] TR-7 Question

[Tom Evans, AG9X]

Ron,

I don't disagree with in some cases purchasing a TR7A is a buyer beware.

But I must say that IF the TR-7 has had all the modifications that
upgrade a TR-7 to a TR-7A, the only remaining significant difference
is the use of a '1496 balanced modulator in the 2nd IF/Audio board
rather than the diode detector.  For all the other changes, Drake
supplied the components and installation instructions free of charge.
What a company!

73,
Tom, AG9X


On Thu, Jun 25, 2009 at 9:48 AM, Ron Bakerwb4...@comcast.net wrote:
 Pete,  the quick answer to both questions is yes. Unfortunately Drake,
 when they were liquidating their inventory, sold to anyone that wanted them,
 the top front panel section which indicated the TR-7A.    I have personally
 seen those panels placed on very early TR7's with serial numbers in the 1000
 range and we know the TR7A appeared around serial number 10,600. So in
 some cases purchasing a TR7A is a buyer beware.

 I wrote an article on how to identify the model differences for that very
 reason. Drake did in fact put the serial number in two places, on the
 rear panel and on the inside, front side of the front sub panel. It is
 major surgery to get to that area which is why most folks would not
 attempt.  But to prove a point, it is one of several way to identify the
 exact model.

 Ron / WB4HFN


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Re: [Drakelist] My Drake TR-4C restoration WEB page

[Tom Evans, AG9X]

Jose,

That's an awesome improvement!

Tom, AG9X


On Thu, Sep 11, 2008 at 6:27 AM, Gary Poland [EMAIL PROTECTED] wrote:
 Thanks for the pictures Jose, good job!

 Gary

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Re: [drakelist] TR7 PTO Frequency Stability

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
John,

On the website of Carel Mulder, PA0CMU are two versions of what's
called a Huff  Puff stabilizer circuit.
The first is by Rien, PA0TRT from Feb. 2004.  A second is from July
2005 when he refined the circuit.
http://home.wanadoo.nl/cmulder/drake.htm#bookmark4

There is also a board available for the circuit designed by HB9ABO
which appeared in BETTER FREQUENCY STABILITY FOR DRAKE TR7 in the
August 1987 issue of Ham Radio magazine.  Far Circuits lists the board
for $8.00 and a reprint of the construction article is $1.50. The only
issues may be parts availability and postage.
http://www.farcircuits.net/

-Tom, AG9X


On Sun, Jul 20, 2008 at 12:43 PM, John Stringer
[EMAIL PROTECTED] wrote:
 John Stringer [EMAIL PROTECTED] made an utterance to the drakelist gang
 --
 I read somewhere that a board is available to improve PTO stability. Please
 tell me where I can find it!  John. GI3KDR


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Re: [drakelist] TR7 2nd IF Audio board

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
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David,

You'll find the answer here:
http://www.dproducts.be/Drake_Museum/page_1.htm

Tom, AG9X

On Sun, May 25, 2008 at 10:57 AM, David  Chris Drake [EMAIL PROTECTED] wrote:
 Hi,
 Does anyone know about when, by serial number, Drake went to the newer
 version 2nd IF-Audio board?

 As much time has passed, I know that unless one is sure his/her radio is
 original, it may be hard to tell due to possible board changes before the
 current owner.  But does someone out there has a good idea?

 FYI, my current TR7 is SN, 5392, split rear panel, late version NB, Late
 version pre-driver, early version digital control board and early version
 IF/Audio.  I may be wrong, but the NB is likely a newer addition.

 I did notice that my IF/audio board has been repaired, an IC replaced and a
 poor soldering job that I had to clean up.  I guess, bottom line,  I'm
 trying to figure out if my audio board is original to the radio or not.

 Thanks,
 David
 WD9CMD

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Re: [drakelist] re TR7 PTO/troubleshooting in general

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
On Thu, Mar 6, 2008 at 10:32 AM,  [EMAIL PROTECTED] wrote:

 For example, the service manuals don't tell you, for a given symptom(s), what 
 the first most likely cause is, what the second most
 likely cause is, and so forth.  The expert service technician knows this 
 based upon experience, you know, that element that makes
 one over qualified and thus unable to perform (not sure I understand that 
 concept but the job interviewers do).

Thanks for the laugh.

Tom, AG9X

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Re: [drakelist] dsp

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Try this instead:

http://www.gapantenna.com/Files/anemreview.pdf

A REVIEW OF THE BHI AMPLIFIED NOISE ELIMINATING
MODULE UTILIZING DSP WITH THE YAESU FT 1000 MP
MARK V MODIFIED WITH THE INRAD ROOFING FILTER

Tom, AG9X

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[drakelist] Re: Drake TR5 schematic

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Thanks to all who have offered a copy of the TR5 schematic.

73,
Tom, AG9X


On 4/4/07, Tom Evans, AG9X [EMAIL PROTECTED] wrote:

I'm looking for a TR5 schematic in either paper or electronic form.

I was unable to locate one online at BAMA or WB4HFN.

Thanks,
Tom, AG9X


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[drakelist] Drake TR5 schematic

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
I'm looking for a TR5 schematic in either paper or electronic form.

I was unable to locate one online at BAMA or WB4HFN.

Thanks,
Tom, AG9X
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Re: [drakelist] TR7

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Peter,

I also have a 1.8 KHz SSB filter.  When I switch from the 2.3 KHz
filter to the 1.8, the extreme lows and a little of the extreme highs
of the audio are reduced.  I do not hear any echo.

You can do a quick test using the TR-7 S-meter.  It's not 100%
accurate, but it's fairly close.

Here's what I did.

1. Put the TR-7 on a dummy load on 10 meters.
2. Turn on the calibrator.
3. Zero beat the calibrator frequency.
4. Turn on the PBT.
5. Adjust the PBT control for maximum S-meter reading.
6. Tune upward to the frequency where the S-meter drops one S-unit
from the peak.  Write down the frequency.
7. Tune downward to the frequency where the S-meter drops one S-unit
from the peak. Write down this frequency.

Here's what I measured:

2.3 KHz Standard SSB filter
28751.1 high
28748.9 low
-
  2.2 KHz


1.8 KHz Narrow SSB filter
28751.0 high
28749.5 low
-
  1.5 KHz


6.0 KHz AM filter
28752.9 high
28747.2 low
-
  5.7 KHz


73, Tom AG9X



On 2/7/07, Keong Family [EMAIL PROTECTED] wrote:



I have a 1.8 khz narrow SSB filter on my TR7.When using this filter it is
very hard to center on speech and is very echo like.Pressing the PBT
improves things dramaticlly.Filter works great on CW and almost makes you
think it has been mislabelled?Any comments.

Thanks Peter
Zl2PW

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Re: [drakelist] RE: audio waveform has warble/hum on it!

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Frank,

Inspect the PTO to see if it has the braid mod.  Without it, the
frequency can jump around ever so slightly.

http://www.zerobeat.net/drakelist/tr7moremods.html
Look for (10)

-Tom, AG9X


On 12/11/06, [EMAIL PROTECTED]
[EMAIL PROTECTED] wrote:



OK, my TR-7 is getting back in line to what it left Ohio many years ago.
I have been listening pretty critically on the receive and it seemed on SSB
like there was a slight warble on the audio.  When going to CW it was harder
to hear but still there.  (I listen to 35+WPM so maybe I couldn't hear it.)
Went to the Calibrator and it seems like the 25kHz calibrator signal is
jumping up and down (in voltage) slightly, maybe  +/- 3% or so on the
scope.  Audio-wise it is hard to hear but.. it is there - warbling ever so
slightly.  There is also some sort of other signal in the background. The
other signal is much lower in frequency, maybe 60Hz?  but the same
amplitude!
The scope seemed like it had problems syncing...  Any thoughts on this?
Frank KG9H

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Re: [drakelist] Substitution Filter Upper Low of TR4-c

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Alignment instructions from TR-4C manual at
http://www.dproducts.be/drake_Museum/TR4.pdf

5-9  9.0 MHz Oscillator
a. Let TR-4C warm up for 30 minutes
b. Set MODE (FUNCTION) switch to SSB position.
c. Turn up the AUDIO GAIN control until noise is audible in the speaker.
d. While switching the SIDEBAND knob back and forth, adjust C130
until the pitch of the noise is the same in both positions.  C130 is
located on the top of the chassis near the rear edge.


or see
http://www.boatanchors.org/TR4.htm

or see
http://www.wb4hfn.com/DRAKE/DrakeManuals/TR4/Manual_TR4.htm

73,
-Tom, AG9X

On 7/10/06, Frank [EMAIL PROTECTED] wrote:


Frank [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Good morning
I have to replace the two filters Upper and low with 9
Mhzes of the TR4-C.
The two filters that I replace are already identical
to those installed.
I desire to have information for alignment procedure.
Thank you at all for collaboaration 73
Fed


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Re: [drakelist] L7

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
http://www.geocities.com/maxmartin3/drake/tech.html

L7 Power Supply schematic
http://www.geocities.com/maxmartin3/drake/l7ps.jpg

L7 schematic
http://www.geocities.com/maxmartin3/drake/l7.jpg



On 5/24/06, Evert Bakker (PA2KW) [EMAIL PROTECTED] wrote:





Hello all,



I just bought the L7 amp without the power supply.

Can anyone tell me what HV is needed (loaded and unloaded voltage and
current)

If one has available an electrical drawing or manual (pref. digital) I would
be very pleased.

Thanks in advance.



Evert, PA2KW

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Re: [drakelist] PS7 Voltage Regulation Problem

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Kevin,

Here's the PS-7 manual:
http://www.wb4hfn.com/DRAKE/DrakeManuals/PS7/Manual_PS7.htm

Here's a better version of the PS-7 schematic:
http://www.dproducts.be/drake_museum/images/PS7schematic.JPG

An even better version of the PS-7 schematic:
http://www.geocities.com/capecanaveral/hangar/6441/drake/ps7.jpg

Here are some PS-7 troubleshooting tips:
http://www.zerobeat.net/drakelist/tr7moremods.html
#3,  #16 and #17 pertain to PS-7

Good luck,
Tom, AG9X



On 3/15/06, Kevin LaHaie [EMAIL PROTECTED] wrote:

 Kevin LaHaie [EMAIL PROTECTED] made an utterance to the drakelist gang
 --
 Hello

 I have inherited a TR7/PS7/MN7 station, which was not working, but
 rumored to have a power supply problem.  Turns out it was the power
 supply regulation board was shutting down the supply after reaching
 about 4 volts.. By removing a feedback lead, the supply would regulate
 to 13.5v.  I replaced the key components on the board - the regulator
 chip (NTE equivalent), a couple of transistors, a zener, resistor values
 all check OK, so the problem is not the 723 chip, but some part of the
 over-voltage protection function.  It is not the is large clamping diode
 that grounds the supply in case of a runaway, but somewhere in the
 'feedback loop' to the 723.

 2 Questions:

 1. anybody have an idea what could be causing this?  I have not replace
 ALL the parts (yet!)
 2. Does anybody know where to get a higher quality schematic scan - the
 one I have is pretty 'muddy', with some voltages at key points on the
 circuit being unreadable, which will no doubt lead me to the solution.

 Thanks in advance to the members of a great list!

 73 Kevin K7ZS

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Re: [drakelist] Re: Drake TR-7 S/N 5586

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Bob,

Defective PIN diodes can cause this.  I'll forward you a thread from this list.

Tom, AG9X


On 3/1/06, Robert C. Abell [EMAIL PROTECTED] wrote:

 Robert C. Abell [EMAIL PROTECTED] made an utterance to the drakelist gang
 --
 I get full power output on 80  40 meters but no measurable output on
 20, 15  10 meters.

 Can anyone advise me what to look for that has failed?

 Bob,  VE3XM
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Re: [drakelist] Certain R4B's may be factory wired for hum

[Tom Evans, AG9X]

Tom Evans, AG9X [EMAIL PROTECTED] made an utterance to the drakelist gang
--
I just repaired my high-end Sony STR-GX67ES receiver where an
electrolytic capacitor was installed backwards at the factory.  The
silk-screened printing on the board was incorrect, but the schematic
had the correct polarity.

Funny thing was it worked fine for over 10 years.

-Tom

On 11/21/05, Garey Barrell [EMAIL PROTECTED] wrote:

 Denny -

 Just one of the reasons PC boards are so popular!  :-)

 Human beans make misteaks
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