Re: [Drakelist] TR-7 Station For Sale - Available at Richmond, VA "Frostfest" on Saturday February 2nd

Nice series of articles in QST Dino! Mike Pappas Pappas Consulting LLC 303-988-0976 advanceddigi...@mac.com > On Jan 31, 2019, at 1:46 PM, Dino Papas wrote: > > I decided to thin the herd a bit and let go of my TR7 station and will have > it available at the Richmond, Virginia “Frostfest” co

[Drakelist] TR-7 Station For Sale - Available at Richmond, VA "Frostfest" on Saturday February 2nd

I decided to thin the herd a bit and let go of my TR7 station and will have it available at the Richmond, Virginia “Frostfest” coming up on February 2nd. A nice rig that has just become excess to my needs. — TR-7 HF transceiver with AUX-7 board — Filters: 6 kHz AM/2.3 kHz SSB/1.8 kHz (SSB/data)

Re: [Drakelist] TR-7 Transceiver 2 Digit LED Display.

] TR-7 Transceiver 2 Digit LED Display. Does anyone know a cross reference Part Number for the Drake TR-7 2 digit, MHz, LED display on the DR-7 board? The Drake Part Number is 3080021. These are the two red seven segment LED numeric displays used to Display the MHz digits in the Frequency

Re: [Drakelist] TR-7 Transceiver 2 Digit LED Display.

There is no known cross reference. DF4NW offers high quality complete display replacements. http://www.df4nw.de/ 73 -Jim NU0C On Wed, 3 Oct 2018 22:20:04 -0500, Robert Sisco wrote: >Does anyone know a cross reference Part Number for the Drake TR-7 >2 digit, MHz, LED display on the DR-7 boar

Re: [Drakelist] TR-7 Transceiver 2 Digit LED Display.

Robert, These are made by a fellow in Germany ... http://www.df4nw.de/ 73, Gary Character height .39" (9.9mm) Price per kit (RED, GREEN or YELLOW): EUR 40,00 BLUE: Limited Quantity Available !!! Price per kit: EUR 45.00 Specify LED colour when ordering Shipping charges see below.

[Drakelist] TR-7 Transceiver 2 Digit LED Display.

Does anyone know a cross reference Part Number for the Drake TR-7 2 digit, MHz, LED display on the DR-7 board? The Drake Part Number is 3080021. These are the two red seven segment LED numeric displays used to Display the MHz digits in the Frequency Counter. One digit has 2 segments, that don’t w

Re: [Drakelist] TR-7 AF/RF Gain control and T/R relay

On Fri, 22 May 2015 12:16:02 -0500, Tom Hendrix wrote: >I am looking for a AF/RF gain control, which includes the on/off switch >for my TR-7. Unobtanium unless you want to pay eBay prices to the "tin man" radio strippers. Otherwise you will need to rebuild it using parts from similar controls.

[Drakelist] TR-7 AF/RF Gain control and T/R relay

Hello all. I am looking for a AF/RF gain control, which includes the on/off switch for my TR-7. Also, the TR-7 is getting lazy about switching back to receive from transmit on both CW and SSB. I suspect the T/R relay because I can repeatedly switch back and forth and it will eventually

Re: [Drakelist] TR-7 "Warble" in received (and transmit) signal

Leon, Try listening for the oscillators on a general coverage receiver. That should help you find the one with the warble. But before you do that, clean and reseat the Molex connectors. That is always the first thing to do when something goes wrong. 73, Bob AD3K On Feb 11, 2014, at 8:59 PM, L

Re: [Drakelist] TR-7 "Warble" in received (and transmit) signal

The analog switch is a CMOS 4016 on the parent board. It's the only IC there, hard to miss. They have been known to cause similar issues. Replace C2108 on the Power Supply board. Even if it's not the problem. Just do it. Don't forget to check your Fixed Passband alignment when you are done. If

[Drakelist] TR-7 "Warble" in received (and transmit) signal

Tuning the "cal." signal and monitoring a transmitted carrier reveals a slight frequency "warble" of sorts.  PTO is clean and has the ground strap modification, and this issue seems unrelated to the PTO, in that physical movement or position of the PTO has no effect.  This is some type of minor

[Drakelist] TR-7 Repair

Hello all Looking for recommendations for mid-Atlantic area TR-7 repairs? Thanks & 73 Bob W3RW ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

[Drakelist] TR-7 off frequency

It has been a while since I asked for help with my TR-7 being off frequency and have since misplaced the names of all who responded to my request. All recommended adjusting L1001 with WWV's signal. I finally got AROUNTUIT and it is finally back on frequency. My heartfelt thanks to all who resp

Re: [Drakelist] TR-7 digital readout

The service manual states that you can jump into the alignment at any point if you are confident that all of the adjustments preceding that point are correct, but that the subsequent adjustments should all be performed in order through the end to ensure proper operation. It may be that only the 40

Re: [Drakelist] TR-7 digital readout

Adjust L1001 on the PBT/Reference board to put the 40 mhz oscillator back on frequency. The 40 Mhz oscillator provides the 500 khz reference for the DR7 board. the 40 mhz crystal tends to drift more than the other two crystals on the PBT/Reference board. 73, Joe KC9LAD At 05:37 PM 12/23/2012,

Re: [Drakelist] TR-7 digital readout

Before or after normal drift? Does it settle down? Regards, Pat W6ABA On Sun, Dec 23, 2012 at 2:37 PM, Dave wrote: > My TR-7 digital readout is off by 100 hz. Can anyone tell me how to > correct it? > > I appreciate any and all help. > > James Wilson > N5DBS > >

[Drakelist] TR-7 digital readout

My TR-7 digital readout is off by 100 hz. Can anyone tell me how to correct it? I appreciate any and all help. James Wilson N5DBS ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] TR-7

You did not say what DDS board is being used or how it is hooked up. My first thought when I read this was to ask if you wired your dds vfo to get powr from the 10 volt receive line that goes to zero transmit so that DDS ends up being turned off during transmit. If you have no VFO during trans

Re: [Drakelist] TR-7

Make sure the RCT push button is not latched IN.___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] TR-7

This is typical behavior when the circuit board contacts need to be cleaned. Open it up and pull, then reseat every plug in board. You might also spray a wee bit of DeOxit on the board contacts. Don't forget to do this to the boards under the horizonal digital display board and the power

[Drakelist] TR-7

I have a TR-7 that has the DDS board installed. It seems to me that it is working in split mode. It receives fine but when you key the MIc the digital display changes and it starts to act as if it is scanning.___ Drakelist mailing list Drakelist@zerobea

Re: [Drakelist] TR-7 all freq transmit mod

At 10:57 PM 8/8/2012, Jim Shorney wrote: Thanks, Thom. I'll send it to you if I ever gat a round tuit. :) ThanksI hope your round tuit locker is in better shape than mine! 73 Thom k3hrn ___ Drakelist mailing list Drakelist@zerobeat.net http://

Re: [Drakelist] TR-7 all freq transmit mod

Thanks, Thom. I'll send it to you if I ever gat a round tuit. :) 73 -Jim NU0C On Wed, 08 Aug 2012 07:11:30 -0400, Thom LaCosta wrote: >At 10:52 PM 8/7/2012, Jim Shorney wrote: > >>The version on the online forum has a note about this mod being for >>the Version >>1 Digital Control board. I wa

Re: [Drakelist] TR-7 all freq transmit mod

At 10:52 PM 8/7/2012, Jim Shorney wrote: The version on the online forum has a note about this mod being for the Version 1 Digital Control board. I was unaware of the Version 2 board when I wrote this, and have not worked out the mod for it because I have not had one at my disposal. If you do

Re: [Drakelist] TR-7 all freq transmit mod

That would be it. The version on the online forum has a note about this mod being for the Version 1 Digital Control board. I was unaware of the Version 2 board when I wrote this, and have not worked out the mod for it because I have not had one at my disposal. On Tue, 07 Aug 2012 08:21:31 -0700,

Re: [Drakelist] TR-7 all freq transmit mod

And the answer was...? Would that be at: http://www.mail-archive.com/drakelist@zerobeat.net/msg09805.html ? >>> On 8/6/2012 at 3:43 PM, wrote: This was just answered on the Yahoo DrakeRadio forum. The info is published in the Drakelist Online Forum. 73 -Jim NU0C On Mon, 6 Aug 2012 11:35:1

Re: [Drakelist] TR-7 all freq transmit mod

This was just answered on the Yahoo DrakeRadio forum. The info is published in the Drakelist Online Forum. 73 -Jim NU0C On Mon, 6 Aug 2012 11:35:15 -0700 (PDT), Allen Bush wrote: >Sometime ago someone posted information about a "better" out of band transmit >modification that was a bit more

[Drakelist] TR-7 all freq transmit mod

Sometime ago someone posted information about a "better" out of band transmit modification that was a bit more complex than just cutting one trace on the motherboard.  I believe it still allowed the out of lock detector to work to stop unexpected off frequency transmissions.  I can't seem to fin

Re: [Drakelist] TR-7 PS Board; need a part!

I suppose you could do that. I've had very few problems with Tants of that era - definitely less than electrolytics. I think in some cases there may have been some underestimation of their tolerance for surges (recalling early Fosgate car stereo amps that were notorious for popping Tants in the po

Re: [Drakelist] TR-7 PS Board; need a part!

Tantalums of that era are not as reliable as their modern equilvalents. When a tanalum fails it usually shorts. Modern tantalums have built in fuses to limit the fireworks should a failure occur. High quality test equipment from the TR-7 era or earlier often have issues with tantalums and I know

Re: [Drakelist] TR-7 PS Board; need a part!

On Fri, 29 Jun 2012 16:12:23 -0500, Brian Koontz wrote: > >I had a tantalum cap on my PS literally explode...I was very >surprised, figured that was a rare event. But not rare enough to >replace all of them? (I went ahead and did anyways...) Tantalums can fail quite dramatically, they are espec

Re: [Drakelist] TR-7 PS Board; need a part!

On Fri, Jun 29, 2012 at 03:56:26PM -0500, Jim Shorney wrote: > You may find this of interest. A VERY worthwhile upgrade, highly recommended: > > http://members.ziggo.nl/cmulder/drake.htm#bookmark5 > > Also, replace the electrolytic cap(s) while you are working on the PS board. > You will be glad

Re: [Drakelist] TR-7 PS Board; need a part!

You may find this of interest. A VERY worthwhile upgrade, highly recommended: http://members.ziggo.nl/cmulder/drake.htm#bookmark5 Also, replace the electrolytic cap(s) while you are working on the PS board. You will be glad you did. That may be the source of your +25 problem anyway. Any Tantalums

[Drakelist] TR-7 PS Board; need a part!

While troubleshooting a VCO power supply problem, R2103, the 1K pot on the PS board fell off! Just what I needed while trying to get this radio going again. I know this is an old topic, but does anyone know where to find a replacement that will fit on the board, or perhaps someone has one the

[Drakelist] TR-7 vco unlocks

I've encountered a new issue with my TR-7. On 20 meters only, as I turn the PTO and reach 14.250, the vco seems to unlock as the DR-7 display stops increasing in frequency and reverses or drifts down 20 or 30 kHz. Below 14.250 all works normally. I pulled the vco board and reseated it and th

Re: [Drakelist] TR-7 Completely Dead (No lights or sounds...)

Richard, Was your issue ever resolved? If so, resolution? 73 Lee WB6SSW In a message dated 5/20/2012 1:48:48 A.M. Pacific Daylight Time, richardvk...@gmail.com writes: My TR-7 is completely dead. I've carefully checked the power supply ... and the problem is not there. 13.5 volts is

Re: [Drakelist] TR-7 Completely Dead (No lights or sounds...)

On Sun, 20 May 2012 12:18:33 -0500, Brian Koontz wrote: > >Look at the small transformer at the lower left of the rig. I had a >dead rig too, and part of the ferrite core had fallen off to the >bottom of the unit. Glued it all back together (don't forget the >little white wire that wraps around

Re: [Drakelist] TR-7 Completely Dead (No lights or sounds...)

On Sun, May 20, 2012 at 11:54:44AM -0500, Brian Koontz wrote: > On Sun, May 20, 2012 at 06:47:42PM +1000, Eraina & Richard Jenkins wrote: > > My TR-7 is completely dead. I've carefully checked the power > > supply ... and the problem is not there. 13.5 volts is getting through > > to the rig. No

Re: [Drakelist] TR-7 Completely Dead (No lights or sounds...)

Yes, that fuse is your first thing to check. Even a nanosecond short on the 12v rail will instantly take out that fuse. They can also fail from years of stress, or there could be oxidation on the fuse holder. It's not quite as hard to change as that, but it does require some dexterity. I usually p

[Drakelist] TR-7 Completely Dead (No lights or sounds...)

My TR-7 is completely dead. I've carefully checked the power supply ... and the problem is not there. 13.5 volts is getting through to the rig. No lights or display come on or anything. No sound from the speaker. Reading Ronald's (WB4HFN) article on "Inside the Drake TR-7 transceiver", he sugg

Re: [Drakelist] TR-7 Extender Boards

VK/tr7ext2.htm They are in like new condition. I will sell them for $55 including shipping (via Priority mail flat rate box). Ernie W8EH -- Message: 2 Date: Tue, 17 Jan 2012 18:53:46 -0800 From: "Pete Juliano" To: Subject: [Drakelist] TR-7 Extender Boards

Re: [Drakelist] TR-7 Extender Boards

Pete - No, Bob is the source. I just saw a message from him the other day, so he is about. His e-mail and phone are at 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs Pete Juli

[Drakelist] TR-7 Extender Boards

I have been trying to locate some extender boards for my TR-7. I understood that Bob W7AVK had made a run of boards. I have been unsuccessful in making any contact with Bob. Are there any other known sources or are the boards on the unobtanium list. 73's Pete N6QW__

Re: [Drakelist] TR-7 Relay

Lee - I am receiving no emails from you. We must have a spam filter that has popped up between us. Try k4...@verizon.net 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs K9sqg wrote: Hi Evan, Lee here... Can you contact Garey Barrel

Re: [Drakelist] TR-7 Relay

Pete - Couple of factors make this relay suitable... 1. 150W into 50 ohms is only about 1.7A, so no problem there. 2. The Drake 'yank-in' VOX system 'probably' closes the contacts before any RF gets to them, limiting the 'make'. 3. The more damaging 'break' comes after the RF is long gone

Re: [Drakelist] TR-7 TR Relay

Pete - Why are you replacing the Varley? I would suggest verifying that the terminal layout is identical, it 'almost' certainly is. Rather than the 'W' contact material, I would suggest the 'Y' used by Drake. The 'W' material (Silver Cadmium Oxide) is rated at 500 mA _minimum_, 7.5A maximum.

[Drakelist] TR-7 TR Relay

I am looking for an alternate to the TR relay in my TR-7 and wonder if anyone has suggested substitutes. As best as I can tell the OEM part was supplied by Varley and the P/N is a VP4CAB/12 V185. The Varleys are made in the UK. I believe this relay is a General Purpose type relay classed as 4 C

[Drakelist] TR-7 Board & Parts

These must be on the unobtanium list but here goes anyway. Please reply direct to jessyst...@broadstripe.net 1) Any one have a working 2nd IF and Audio Board for a TR-7, the later version with the MC1496 for the product detector, they would like to exchange for . The one currently listed on

[Drakelist] TR-7

Any one thinking of selling their TR-7? Please respond direct and let me know the condition and price? Units requiring repair are OK Thanks & 73's Pete N6QW ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinf

Re: [Drakelist] TR-7 Transmit issues

Thanks Joe, Mouser has them for a buck and a half. That's more like it. Bob K6GGO Sent from my iPad On Dec 20, 2011, at 4:15 PM, Joe Pyles wrote: > again, ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listin

Re: [Drakelist] TR-7 Transmit issues

I use NTE229 to replace the MPSH20 on the predriver board and they work fine. 73, Joe KC9LAD At 06:57 PM 12/20/2011, you wrote: Sorry about that, I sent the e-mail before I was done typing. Does anyone have source for an MPS-H20. It looks like they aren't available. I found a reference to it o

Re: [Drakelist] TR-7 Transmit issues

Sorry about that, I sent the e-mail before I was done typing. Does anyone have source for an MPS-H20. It looks like they aren't available. I found a reference to it on the Drake mods document. The guy says he replaces them with MRF237 because it can handle a little extra power. Apparently, he th

Re: [Drakelist] TR-7 Transmit issues

Well, it seems that the first transistor on the driver board is the culprit. Or, at least, when the transmitter fails, that is where the RF stops. It is a Motorola MPS-H20 I found the schematic on Ron's site. Thanks Lee. Bob K6GGO Hi Guys, Thanks for the replies. The first thing I thought to

Re: [Drakelist] TR-7 Transmit issues

I found the schematic on Ron's site. Thanks Lee. Bob K6GGO Hi Guys, Thanks for the replies. The first thing I thought to do was re-seat the boards and I did. Well, I didn't re-seat the ones that were hidden under the display board (DR-7). I'll take it apart and re-seat them if I have to, bu

Re: [Drakelist] TR-7 Transmit issues

Hi Guys, Thanks for the replies. The first thing I thought to do was re-seat the boards and I did. Well, I didn't re-seat the ones that were hidden under the display board (DR-7). I'll take it apart and re-seat them if I have to, but, I think I have isolated the problem to the pre-driver board

Re: [Drakelist] TR-7 Transmit issues

Before you start replacing parts clean the Band Switch contacts and reseat the boards. That usually fixes it for another year. Steve J. Steven Cochrane W7JSC - Original Message - From: "Robert Fish" To: Sent: Tuesday, December 20, 2011 1:15 PM Subject: [Drakelist] TR-

Re: [Drakelist] TR-7 Transmit issues

Hi Bob: Before jumping right to looking for a flaky component, have you done the requisite re-seating of the board? Deoxit on the edge connector, and relay cleaning? FWIW Curt KU8L On 12/20/2011 3:15 PM, Robert Fish wrote: Hi Guys, I have a two part question. I noticed a few weeks ago th

[Drakelist] TR-7 Transmit issues

Hi Guys, I have a two part question. I noticed a few weeks ago that, on occasion, my TR-7 would not transmit when keyed. If I unkey and then key again, it would transmit. I noticed when running digital modes, which I do using VOX for keying the transmitter. Well, the last few days it has become

[Drakelist] TR-7 Help!

Hello from Australia. I am new to this group so apologies if the format of this message is wrong Just got a TR-7, and it the best traditions of on-line shopping it's arrived faulty. When powered on, the panel lights come on but not other sign of activity. It is drawing close to 5 amps at 13.8

Re: [Drakelist] TR-7 dial

I'm sure you are correct Jim...but I'm a short timer! Curt On 11/17/2011 8:46 PM, Jim Shorney wrote: On Thu, 17 Nov 2011 09:48:33 -0500, Garey Barrell wrote: I like the material of your CD washer, but the od is too big to fit through the front bezel of the 7 Line, and of course not nearly lo

Re: [Drakelist] TR-7 dial

On Thu, 17 Nov 2011 09:48:33 -0500, Garey Barrell wrote: >I like the material of your CD washer, but the od is too big to fit through >the front bezel of the 7 >Line, and of course not nearly long enough. The problem that I see with foam is that it tends to decay into goo after a time. Given t

Re: [Drakelist] TR-7

Bill - Does the radio move, or just the display? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs Billy Loyd wrote: I have a Drake TR-7 and every now and then it will move 1000kc...In other words when on 3.700 it will change to 2.700..

[Drakelist] TR-7

I have a Drake TR-7 and every now and then it will move 1000kc...In other words when on 3.700 it will change to 2.700...It does not last long but does it every so oftenAnyone have an idea where to start lookingThe voltege regulator pot is set at 10 voltsThats as far as I have checked

Re: [Drakelist] TR-7 dial

can get a B knob and skirt onto a T-4X so it sorta matches an R-4B. So now I'm curious: was the dial skirt assembly significantly different, or did Drake merely stop using the wave washers and switch to the tubing? Enjoy Those Drakes... Steve, W1ES/4 -Original Message- From: Curt Nixo

Re: [Drakelist] TR-7 dial

Curt - No, they both go between the skirt and the washer in front of the C-clip. There are 'ears' in the center hole of the skirt that fit into notches on the front of the larger brass shaft. I like the material of your CD washer, but the od is too big to fit through the front bezel of the 7

Re: [Drakelist] TR-7 dial

I replaced mine with a felt disk. On 17/11/11 13:00, drakelist-requ...@zerobeat.net wrote: Message: 1 Date: Wed, 16 Nov 2011 17:32:43 -0800 (PST) From: Allen Bush To:drakelist@zerobeat.net Subject: [Drakelist] TR-7 dial Message-ID: <1321493563.44233.yahoomailclas...@web161203.mail.

Re: [Drakelist] TR-7 dial

significantly different, or did Drake merely stop using the wave washers and switch to the tubing? Enjoy Those Drakes... Steve, W1ES/4 -Original Message- >From: Curt Nixon >Sent: Nov 17, 2011 7:12 AM >To: drakelist@zerobeat.net >Subject: Re: [Drakelist] TR-7 dial > >Isn&

Re: [Drakelist] TR-7 dial

Isn't the "clutch washer between the knob and the skirt? Perhaps I'm thinking of the 3 and 4 series. Curt On 11/16/2011 10:17 PM, Garey Barrell wrote: Allen - There are several choices. The original is surgical rubber tubing, which is a translucent amber colored rubber tubing. It's very so

Re: [Drakelist] TR-7 dial

Yes... In the past I have use an O ring from the hardware store. But the best is a white foam washer that is used in the packing of the cylinder packs of CD's and DVD blanks. Approx ID is 9/16, OD is approx 1.2" and thickness approx 1/8. Soft, high density foam. Curt On 11/16/2011 8:32 P

Re: [Drakelist] TR-7 dial

My experience is that the independently owned hardware stores where I live actually sell surgical tubing in a few sizes. -Original Message- From: Garey Barrell To: Allen Bush Cc: drakelist Sent: Wed, Nov 16, 2011 5:18 pm Subject: Re: [Drakelist] TR-7 dial Allen - There are

Re: [Drakelist] TR-7 dial

Allen - There are several choices. The original is surgical rubber tubing, which is a translucent amber colored rubber tubing. It's very soft and flexible, and makes a great 'clutch' material. Unfortunately after 30-40 years it gets hard and darkens in color. It is difficult to find unless

[Drakelist] TR-7 dial

Does anyone have a recommendation for the little rubber piece that goes behind the dial skirt and allows the dial/knob to be slipped to calibrate the skirt?  Mine have turned hard and are cracking and turning to dust  Allen, W0OUU___ Drakelist maili

Re: [Drakelist] TR-7 Off Frequency (1Khz)

Hi Brian, On Tue, 05 Jul 2011 13:26:33 -0400, bjon...@mindspring.com wrote: >Finally I >remembered my freq counter (keeps track of my 10Mhz frequency standard) >so I hooked the drake up to it directly and threw a 1W cw tone at it and >was off by 1Khz (i.e the DR7 displayed 14.2140, but the counte

[Drakelist] TR-7 Off Frequency (1Khz)

Long story short: What prompted this was trying to troubleshoot my dad's rig (SGC2020) on the air (there was a question about what frequency he was actually on)... we could not seem to meet up on the right frequency. Finally I remembered my freq counter (keeps track of my 10Mhz frequency standard

Re: [Drakelist] TR-7 HELP

On this page...down to restoration techniques...TR-7 Sticky Paint repair. It works and is a lot easier to do than a repaint. Lots of other great info also http://www.wb4hfn.com/DRAKE/DrakeTechTips.htm Curt KU8L Norman & Barbara Ray wrote: I have a complete TR-7 which I am helping a silent

[Drakelist] TR-7 HELP

I have a complete TR-7 which I am helping a silent key widow dispose of. It has all the boxes made for it including a bunch of Drake log books. I know this has been covered so apologize ahead of time for posting this but I am concerned about the finish being what some call “sticky”. It is in

Re: [Drakelist] TR-7 no transmit

On Fri, 18 Feb 2011 13:56:25 -0800, kendw...@netscape.com wrote: >S-meter drops to zero, and no movement on w-7 meter on transmit test, two >differet 7077, A-104 mics. Any output in CW or AM? 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000

Re: [Drakelist] TR-7 no transmit

Ken, Have you tried CW mode to see if it is related to the audio chain vs more or less just the RF chain? 73, Ron WD8SBB --- On Fri, 2/18/11, kendw...@netscape.com wrote: > From: kendw...@netscape.com > Subject: [Drakelist] TR-7 no transmit > To: drakelist@zerobeat.net >

[Drakelist] TR-7 no transmit

Power up, good receive on short 20' wire, s-3 steady, couple of jumps to s-5 on strong 20 meter signal. S-meter drops to zero, and no movement on w-7 meter on transmit test, two differet 7077, A-104 mics.(300 watt drake dummy attached to W7) mid 3k range, all late boards, including aux7, NB, 2

Re: [Drakelist] TR-7 local oscillator

: drakelist@zerobeat.net Subject: Re: [Drakelist] TR-7 local oscillator Al - There are two PLL's in the TR-7, one for the bands below 20M and another for bands above. Your 'high band' VCO is not locking. The 'wandering' frequency is just the free-running VCO going to it&

Re: [Drakelist] TR-7 local oscillator

Al - There are two PLL's in the TR-7, one for the bands below 20M and another for bands above. Your 'high band' VCO is not locking. The 'wandering' frequency is just the free-running VCO going to it's 'idle' frequency 'or so', which should be around 32 MHz. First suspect is corrosion on th

Re: [Drakelist] TR-7 local oscillator

First things to check are the +24v power supply and those pesky Molex pin connectors between the DR-7 and the boards underneath it. 73 -Jim On Wed, 2 Feb 2011 00:49:10 -, Al Ward wrote: >Hello to the group >My TR-7 local oscillator for bands 20M and above will not lock. The display >shows

[Drakelist] TR-7 local oscillator

Hello to the group My TR-7 local oscillator for bands 20M and above will not lock. The display shows it wondering up in frequency. The last band position that works properly is the 7 MHz position and you can step the frequency segments up to 10 MHz and that is as high as it will go and stay locked.

Re: [Drakelist] TR-7 28 MHz power falloff

Hi Gary, On Sat, 11 Dec 2010 13:34:19 -0500, Garey Barrell wrote: >PIN diodes are kinda like PA tubes. They get leaky, and start to fall >off at the highest frequencies first. They don't always short or open! That may be true, but I wouldn't expect that much in just 400 KHz. I've been tempted

Re: [Drakelist] TR-7 28 MHz power falloff

Jim - PIN diodes are kinda like PA tubes. They get leaky, and start to fall off at the highest frequencies first. They don't always short or open! Perhaps this is why you're not hearing much on 10 either! :-) Yes, it could be a cap in the LP filter, but I'd say diodes are much more likely

Re: [Drakelist] TR-7 28 MHz power falloff

I'm getting some great suggestions, thanks to everyone. However, just so we are all on the same page, I know about the PIN doides. I am discounting them at this point since the power out is OK at 28.0, but falls off by a good 35 watts by 28.4. This does not seem like PIN diode behaviour. 73 -J

Re: [Drakelist] TR-7 28 MHz power falloff

Thanks, Bob. Yeah, I know that those PIN diodes get blamed for lots of stuff that they don't really cause. :) I was getting a solid 90+ watts out on 10 Meters, with ALC, after I rebuilt the PA deck. Perhaps not the best it could do, but certianly adequate. The power level drop does not concern me s

[Drakelist] TR-7 28 MHz power falloff

Hi gang, Here's an odd one. Fired up the trusty 7-Line this weekend for the 10 Meter contest, and I noticed that I wasn't gettng any ALC action and power output was low. Further investigation revealed that the power drops from about 95 Watts CW at 28.0 to around 65 Watts at 28.4 MHz into a DL-100

Re: [Drakelist] TR-7 Update

On Sat, 16 Oct 2010 20:19:54 -0400, K8JDC wrote: >I backed off the pot on the predriver board and it's happy so far. I >backed it off very slightly and it still oscillated on 40m so I had to >go further. I think I still have about the same output power and I >think the ALC LED is still coming

Re: [Drakelist] TR-7 - More Info Cont'd

tion from points on the motherboard. The entire mod can be removed in very short order if desired. 73, K8AC - Original Message - From: "Jim Shorney" To: Sent: Saturday, October 16, 2010 6:09 PM Subject: Re: [Drakelist] TR-7 - More Info Cont'd On Sat, 16 Oct 2010 16

[Drakelist] TR-7 Update

Sorry for hogging the Drakelist today... I backed off the pot on the predriver board and it's happy so far. I backed it off very slightly and it still oscillated on 40m so I had to go further. I think I still have about the same output power and I think the ALC LED is still coming on correc

Re: [Drakelist] TR-7 - More Info

On Sat, 16 Oct 2010 15:43:01 -0400, Garey Barrell wrote: > >Is that a possibility? If the antenna is tuned to 20M by the tuner, and >the transmitter is putting out 40M RF, then the transmitter is seeing a >mismatch and 'shuts down'. Does it 'really' go to ZERO power or is it >just rolled back

Re: [Drakelist] TR-7 - More Info Cont'd

On Sat, 16 Oct 2010 16:50:50 -0400, K8JDC wrote: >I had trouble keeping it from oscillating when I followed >the instructions. I tried to follow the service manual carefully but it >wanted to oscillate. I had to fiddle with it a fair amount going >between the two adjustment pots to make it ha

[Drakelist] TR-7 - More Info Cont'd

To everybody who has written thus far, I thank you. Still working on it... - I have double-checked the ground connections on the tuner and radio. All is good there. - To Gary who suggested that the external tuner indicated that the problem was past that point, I hooked my Tentec up to the

Re: [Drakelist] TR-7 - More Info

Jim - Is that a possibility? If the antenna is tuned to 20M by the tuner, and the transmitter is putting out 40M RF, then the transmitter is seeing a mismatch and 'shuts down'. Does it 'really' go to ZERO power or is it just rolled back to 20 or so Watts? BUT, if you put 40M RF into a tune

Re: [Drakelist] TR-7  - More Info

> Date: Sat, 16 Oct 2010 12:03:18 -0400 > From: K8JDC > To: drakelist@zerobeat.net > Subject: [Drakelist] TR-7  - More Info > Message-ID: <4cb9ccc6.7020...@sbcglobal.net> > Content-Type: text/plain; charset=ISO-8859-1; > format=flowed > >   Some more data

Re: [Drakelist] TR-7 - More Info

That *almost* sounds like the 40 Meter oscillation problem - except for the behaviour of the forward power meter. Some TR-7s are prone to PA deck oscillation in the 40 meter band with a reactive load (antenna). The easy fix for this is to reduce the gain of the predriver board by adjusting the pro

Re: [Drakelist] TR-7 - More Info

Dave - If the external SWR meter goes to 'infinity' on reflected, then the problem is PAST that meter. The fact that it is ok on a dummy load also indicates an antenna problem. Sounds like an open feedline, - OR - balun, if used. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-B, C

Re: [Drakelist] TR-7 - More Info

line, depending on where it is located, it can cause strange indications in the shack due to RF radiation. Steve w7jsc - Original Message - From: "Don Cunningham" To: "K8JDC" ; Sent: Saturday, October 16, 2010 10:10 AM Subject: Re: [Drakelist] TR-7 - More Info >

Re: [Drakelist] TR-7 - More Info

Dave, Do you have a good ground on your balanced line tuner?? I have those problems with my tuners and ladder line if I don't have a good ground hooked up. 73, Don, WB5HAK ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.

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