[Drakelist] Passband tuner hard to turn
The pass band tuner on my R4A grinds a little when I turn it for about 20% of the 360 degree range. Any idea what is wrong? Typically this happens after a lot of use. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake TR-7A VCXO xtal problem
I sent the OEM 13.695 MHz xtal into ICM and asked that they duplicate the operating characteristics. The xtal I received from them will operate on 13.695 MHz but is unable to be pulled the necessary +/- 3 KHz in the VCXO circuit. I can only get +/- 1.7 Khz, not enough. Bottom line: ICM xtals made for the 13.695 MHz VCXO will not operate properly in the VCXO circuit. I am $50 poorer and no operating xtals from ICM. I re-installed the OEM xtal, aligned and the TR-7A is working beautifully. Ron ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Passband tuner hard to turn
This assembly can be taken apart and is fairly easy. The grease in your PBT is probably all dried-out. You'll need to unsolder the box at the rear, remove the screws and then pull the slug rack straight back (after removing the knob on the front, of course). I've had lithium grease recommended as the replacement - use a modest amount. You'll notice that the round disc at the back end of the shaft is spring-loaded against the front and has varying thickness - which is how the slug rack goes in and out. Put a little light lube on the shaft, too. The whole thing goes back together easily. Tighten the screws and re-solder and you're done. Set the knob per the alignment procedure: slugs fully back should have the knob pointing at 9 o'clock. 73, Steve Wedge, W1ES/4 To be is to do - Socrates To do is to be - Plato Do be do be do. - Sinatra All my computers have my signature with various pearls of wisdom appended thereto. -- From: Neil M Califano cchange...@yahoo.com Sent: Saturday, October 29, 2011 2:10 AM To: Drakelist@zerobeat.net Subject: [Drakelist] Passband tuner hard to turn The pass band tuner on my R4A grinds a little when I turn it for about 20% of the 360 degree range. Any idea what is wrong? Typically this happens after a lot of use. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Please standby
The standby mode on the R4A isn't really electrically standby is it? It seems to be only an audio muting. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Xtals
I need a 39.1 Mhz xtal for 10 meters CW (1 or 2) I have the following excess to my needs: 1.5 Mhz 14.1 Mhz 15.4 Mhz 15.6 Mhz Trade - swap or Buy the 10 meter CW xtal 73 Gary K7OX___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Please standby
I always assumed it was as if it was muted. I believe you still have all the plate and screen voltages. Steve Wedge, W1ES/4 To be is to do - Socrates To do is to be - Plato Do be do be do. - Sinatra All my computers have my signature with various pearls of wisdom appended thereto. -- From: Neil M Califano cchange...@yahoo.com Sent: Saturday, October 29, 2011 5:29 PM To: Drakelist@zerobeat.net Subject: [Drakelist] Please standby The standby mode on the R4A isn't really electrically standby is it? It seems to be only an audio muting. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4b
Hi All, I am in the process of restoring one of those R-4B radios that were offered on this list. I have never owned an R-4B and I have a couple of questions: First of all, I have the receiver 95% operational. 1) I am used to the S meter on other radios going to full scale when RF gain is reduced to zero. The R4b doesn't do that. Also, the RF gain control just reduces background noise level by about 5 S units while the signal remains about the same. Is this normal? 2)I think the previous owner made some changes in the AVC circuitry. As it stands now AVC fast seems to operate as it would in any other radio, a fairly fast tracking rate. AVC slow, however, is really slow taking a full 4-5 seconds for the S meter reading to decay in the absence of a signal. Is this normal? I will be examining the AVC circuitry for mods tomorrow but won't dive into that if this is normal operation. AVC off works as normal. 3) Last question: With RF gain fully CW on the R4B the ambient (no signal) noise level is 3-4 S units above where the TS-850 and TS-480 indicate the noise level is for the same antenna system (trap dipole up 27') and RF gain full on. Is this an indication that tube radios have a higher sensitivity to atmospheric noise? With the RF gain fully CCW the indicated noise level on the R4B is comparable to the newer radios with RF gain full on. Not sure what to make of this. Thanks! Ron KK7KZ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Please standby
The AVC bus is allowed to float to maximum, effectively cutting off all AVC controlled stages. The front panel FUNCTION switch must be on ON, NB or CAL for the external mute to take effect. -- 73, Garey - K4OAH St Charles, IL Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Neil M Califano wrote: The standby mode on the R4A isn't really electrically standby is it? It seems to be only an audio muting. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Passband tuner
What is the range in khz of the R4A passband tuner? Is there a range in khz like a fine tuning? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] AC-3 vs AC-4
I just acquired another small pile of Drake gear from a friend. He gave the rest to me in exchange for cleaning and aligning the T-4X and returning it with PS. Included with the gear was a TR-3 in pretty rough shape - not sure what I'll do with this aside from part it out. There are, however, two AC-3's (and a MS-3), so the whole deal is pretty good regardless (besides, he's my friend and has worked on some of my old Johnson stuff in years past). The main question is this: what's the major difference between the AC-3 and the AC-4? Is it strictly the parts locations and the absence of the VOX RLY connector? Enjoy Those Drakes... Steve Wedge, W1ES/4 To be is to do - Socrates To do is to be - Plato Do be do be do. - Sinatra All my computers have my signature with various pearls of wisdom appended thereto. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake TR-7A VCXO xtal problem
On Sat, 29 Oct 2011 06:18:47 -0600, Ron Ries wrote: I sent the OEM 13.695 MHz xtal into ICM and asked that they duplicate the operating characteristics. The xtal I received from them will operate on 13.695 MHz but is unable to be pulled the necessary +/- 3 KHz in the VCXO circuit. I can only get +/- 1.7 Khz, not enough. Bottom line: ICM xtals made for the 13.695 MHz VCXO will not operate properly in the VCXO circuit. I am $50 poorer and no operating xtals from ICM. It sounds like the original crystal may not be a standard cut that would be used for that frequency. Did you tell ICM that the crystal was in a VXO? Did you send them a schematic of the oscillator? I would think that they would still want to make things right with it. 73 -Jim -- 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] FW: MC4016P for the UV3
Hanks to Curt, KU8L, I have received the MC4016P chips. BGMicro had a zillion of them. Put one in place of the bad one and still no joy. It is locking up on a different frequency. Note the test was after I tried a good divider board from the other unit and it worked fine. So, does anyone know if a source of extender boards for the UV3? The one needed is to essentially extend the connection of a 22 pin, double sided computer board type socket. After that I can then trouble shoot further. After this is fixed, I will tackle the no output on the 440 board. Many thanks for the help. David Assaf, III W5XU -Original Message- From: David Assaf [mailto:w...@cox.net] Sent: Thursday, October 27, 2011 8:45 AM To: David 3 Subject: Re: MC4016P Have them ordered. Again many thanks for the tip. Will be nice to get this one off the bench. Have more in line. Hopefully it will do the trick. Sent from my iPhone David Assaf, III On Oct 25, 2011, at 10:54, David 3 w...@cox.net wrote: -Original Message- From: Curt [mailto:cptc...@flash.net] Sent: Monday, October 10, 2011 9:35 AM To: David Subject: MC4016P Think I got the last ones I used here. Not certain because its been a while but I see they still have them listed and addable to their shopping carts. Hope this helps..let me know how it goes and if they are not available, I will look deeper here. Curt KU8L http://www.bgmicro.com/ics1028.aspx - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1834 / Virus Database: 2092/4579 - Release Date: 10/27/11 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] AC-3 vs AC-4
On Sat, 29 Oct 2011 20:04:23 -0400, Steve Wedge wrote: The main question is this: what's the major difference between the AC-3 and the AC-4? Is it strictly the parts locations and the absence of the VOX RLY connector? See the thread here: http://www.mail-archive.com/drakelist@zerobeat.net/msg04591.html 73 -Jim -- 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR-7A xtal issue
Jim, They had a schematic, a crystal with which they took all the important measurements, knew it was in a VCXO circuit with all the expected performance specs and we had at least 10 telephone conversations discussing the obvious problems. Still didn't turn out like the OEM xtal. I have contacted them with the result and am awaiting a return communication. It's been several days now…. R. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR-7A xtal issue
Sounds like you covered all the bases. I hope someone doesn't have to send them a whole radio. 73 -Jim On Sat, 29 Oct 2011 18:18:59 -0600, Ron Ries wrote: Jim, They had a schematic, a crystal with which they took all the important measurements, knew it was in a VCXO circuit with all the expected performance specs and we had at least 10 telephone conversations discussing the obvious problems. Still didn't turn out like the OEM xtal. I have contacted them with the result and am awaiting a return communication. It's been several days now . R. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist -- 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] WTB: Drake 2B Faceplate
Sorry if this is a duplicate email. I had a bit of trouble with my Outlook today. I'm restoring a 2B s/n 11222. It's in very good condition except someone drilled a small hole in the faceplate, not sure for what reason, to the right of the AF Gain knob. The plate is in great condition, except for the hole. Before I go tearing up another 2B just to get the faceplate, I thought I'd see if anyone out here has a very good condition plate they'd like to sell. It needs to be scratch and ding free, no visible rust, and with all the letters and numbers clean and white. Thanks much Ferris Jennings NB6T ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] AC-3 vs AC-4
TNX, Jim. Shoulda known someone else would've brought it up by now. I've just been given an AC-3; I assumed it would play with all the 4-line, so it's a nice gift indeed. The MS-3's a nice bonus. I'm thinking the TR-3 is a basket case, though. Definitely worth it if any of the tubes are good - especially the finals. Steve Wedge, W1ES/4 To be is to do - Socrates To do is to be - Plato Do be do be do. - Sinatra All my computers have my signature with various pearls of wisdom appended thereto. -- From: Jim Shorney jshor...@inebraska.com Sent: Saturday, October 29, 2011 8:14 PM To: Drake List drakelist@zerobeat.net Subject: Re: [Drakelist] AC-3 vs AC-4 On Sat, 29 Oct 2011 20:04:23 -0400, Steve Wedge wrote: The main question is this: what's the major difference between the AC-3 and the AC-4? Is it strictly the parts locations and the absence of the VOX RLY connector? See the thread here: http://www.mail-archive.com/drakelist@zerobeat.net/msg04591.html 73 -Jim -- 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] AC-3 vs AC-4
And based on the AC3, there is a test point which is normally tied to ground. When you lift it from ground, you measure voltage drop across a resistor. This voltage happens to directly relate to final current. This allows you to easily adjust the bias w/o trying to figure out how accurate the rig's meter is calibrated, etc. I modified my AC4R PCB to include a resistor etc. Sent the data to Wb4HFN. Don't think it was ever posted on his site. 73, Ron WD8SBB --- On Sat, 10/29/11, Jim Shorney jshor...@inebraska.com wrote: From: Jim Shorney jshor...@inebraska.com Subject: Re: [Drakelist] AC-3 vs AC-4 To: Drake List drakelist@zerobeat.net Date: Saturday, October 29, 2011, 8:14 PM On Sat, 29 Oct 2011 20:04:23 -0400, Steve Wedge wrote: The main question is this: what's the major difference between the AC-3 and the AC-4? Is it strictly the parts locations and the absence of the VOX RLY connector? See the thread here: http://www.mail-archive.com/drakelist@zerobeat.net/msg04591.html 73 -Jim -- 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4XB Poor Transmit audio
After receiving good audio reports for a year or so on the B line, suddenly am getting poor audio reports on the T4XB. Listening to the audio on the R4B with the mute off it sounds almost 'OK' and I would think it was just overload into the R4 not really hum or RF on the audio but more like listening to two receivers one on each side of the room a few cycles off each other. I have tried swapping the AC-4 (that has new filters) with another working AC-3 with little change in reports. Are any other troubleshooting ideas? It has been working fine since last winter. I check into the same 40M net and the same people who usually say the audio is good now say there is something 'not right' with the audio. -- Paul Gerhardt K3PG http://pgerhardt.blogspot.com QRP ARCI 6674 FP 274 You must do this work with love or you fail. -- John Muir, from How to Keep Your Volkswagen Alive ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] AC-3 vs AC-4
Steve, If I remember correctly, the finals in the TR3 are 12JB6's, not 6JB6's so not compatible with the T4(any). My memory isn't what it used to be, but that's what comes through the fog. There's also no cover over the top of the power supply. If you use the Heathkit Shop's board, download his special instructions for putting it in the AC3. 73, Don, WB5HAK ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
