[Drakelist] T4XC drive
My T4XC began providing full output on cw regardless of where the drive control was set--even all the way CCW. Normally on CW you have to advance it beyond 12 o'clock for full output. I consulted with Garey, K4OAH, and at his suggestion, checked R-105, the xmit gain control for continuity and value and it checked out. I also checked R106 and it checked out okay. His CD was a great help in locating R-106. I am going to trace and check the associated wiring. Another other thoughts or ideas to check out would be appreciated. Thank you Rick W0RT___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4XC drive
Rick - Check the DC voltage on the shielded wire at T14 (center pin on side closest to CAR BAL pot). In CW mode, this voltage should be 0.0 with the GAIN at MIN, rising to about a volt as the GAIN is turned up. IF the voltage does NOT go to 0 at MIN, there is a problem with R105/R15, switch, etc. In AM mode this voltage should be about a volt regardless of GAIN position. 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 www.k4oah.com Richard Tucker wrote: My T4XC began providing full output on cw regardless of where the drive control was set--even all the way CCW. Normally on CW you have to advance it beyond 12 o'clock for full output. I consulted with Garey, K4OAH, and at his suggestion, checked R-105, the xmit gain control for continuity and value and it checked out. I also checked R106 and it checked out okay. His CD was a great help in locating R-106. I am going to trace and check the associated wiring. Another other thoughts or ideas to check out would be appreciated. Thank you Rick ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4XC drive
Rick, Is this on any particular band? Does the power out vary with position of the TUNE and LOAD controls? Does this happen into a dummy load? If the PA goes into parasitic oscillation power out will go full bore with the slightest advancement of the GAIN control. Also if there is an issue with the carrier null this will also cause full or nearly full output when the mic is keyed. 73, Gary http://home.roadrunner.com/~w8pu/___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 issue
Hello all... I'm a newbie to the list and this is my first message to the group, but I've corresponded to a few individuals privately, mostly because I have the wisdom to know what I don't know. The fact is that I'm in the process of duplicating my TR7 rig from the 1980's and from the day I broke open all those new factory sealed Drake boxes way back then until I replaced it, it functioned trouble-free, so what do I know about stuff that goes wrong or fixing it? (Answer: Not much!) I did share the remedy Ron Baker applied to my recently acquired TR7 that in retrospect I should have posted to the group. At the time, as far as I knew, it was knowledge and would have been just a lot of QRN. I won't be so concerned from now on. Far be it for me, a newcomer, to criticize how the list is run, but (here it comes) I don't understand why there's a response to both an individual and to the list. I realize that some may subscribe to a daily digest and maybe the thought is the redundancy is so they'll get their reply right away, but why burden the real-time members with duplicate mailings? Based on a time I was getting a hundred or so mailings decades ago from several discussion lists, many of them duplicates, I'd vote for the option to reply to the list, or to the individual at the respondent's option. 73! Tony Stalls, K4KYO Arlington, VA At 12:18 AM 12/14/2010, Richard Knoppow wrote: - Original Message - From: john joh...@nc.rr.com To: k4...@mindspring.com; captc...@flash.net Cc: drakelist@zerobeat.net Sent: Monday, December 13, 2010 12:32 PM Subject: Re: [Drakelist] TR7 issue Just to jump in here and reinforce what Garey mentioned...PLEASE respond to the reflector and to the original poster if need be. You can save the next guy with the same problem a LOT of time if you share your suggestions and fixes with the reflector (and the reflector archives). Don't be shy, POST.:-) John K5MO This is the problem with different mailing lists being set up differently, this one, and the Collins list, is set up so that hitting _reply_ goes only to the original poster, one must click on _reply all_, then the message goes to both the original sender and the list and sometimes others who have responded to the thread. This one is going to three people plus the list if I don't edit the To: field. I have heard arguments both ways about this arrangement. For me its a bit of a PITA because I subscribe to about twenty mailing lists and there is not consistent way of responding to posts. I've learned to look at the To field if I am not certain about a particular list. Everyone thinks their way is the best way which is why we have political parties and brands of cola. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ 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] TR7 issue
- Original Message - From: Richard A. (Tony) Stalls rasta...@verizon.net To: drakelist@zerobeat.net Sent: Tuesday, December 14, 2010 6:52 AM Subject: Re: [Drakelist] TR7 issue Hello all... I'm a newbie to the list and this is my first message to the group, but I've corresponded to a few individuals privately, mostly because I have the wisdom to know what I don't know. The fact is that I'm in the process of duplicating my TR7 rig from the 1980's and from the day I broke open all those new factory sealed Drake boxes way back then until I replaced it, it functioned trouble-free, so what do I know about stuff that goes wrong or fixing it? (Answer: Not much!) I did share the remedy Ron Baker applied to my recently acquired TR7 that in retrospect I should have posted to the group. At the time, as far as I knew, it was knowledge and would have been just a lot of QRN. I won't be so concerned from now on. Far be it for me, a newcomer, to criticize how the list is run, but (here it comes) I don't understand why there's a response to both an individual and to the list. I realize that some may subscribe to a daily digest and maybe the thought is the redundancy is so they'll get their reply right away, but why burden the real-time members with duplicate mailings? Based on a time I was getting a hundred or so mailings decades ago from several discussion lists, many of them duplicates, I'd vote for the option to reply to the list, or to the individual at the respondent's option. 73! Tony Stalls, K4KYO Arlington, VA I think the reply function is set up by the list administrator but it may vary with the mail client. In Outlook Express if I choose reply for this list my message goes only to the original poster, not the list. If I choose reply all my message goes to both original poster and the list unless I edit the To field to eliminate the original poster. I belong to other lists that work this way but the majority of them are set up so that reply goes only to the list and reply all goes to both list and original poster. That can be edited if one wishes to reply off list. I much prefer the latter set up but the administrators of the lists using the former defend their choice. I have learned to be careful to see who is getting replys and tailor them as required. It did take me a while to figure out what was going on since all of the lists subscribed to first used the first method, i.e., reply went to the list. I also agree about the second method sometimes providing help to the orignal poster that does not go to the list archive if one is kept. I think the arrangement of requiring reply all to reply to a list can reduce the value of the list as a forum for mutual discussion of subjects and can also result in multiple messages to the original posters, or to every participant in a particular post in some lists. IMO this is counter to the whole idea of a mail reflector. However, the list owners are the ones to decide and I have just learned to work with whatever is there. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 issue
Richard Knoppow wrote: - Original Message - From: Richard A. (Tony) Stalls rasta...@verizon.net Hello all... I'm a newbie to the list and this is my first message to the group, but I've corresponded to a few individuals privately, mostly because I have the wisdom to know what I don't know. The fact is that I'm in the process of duplicating my TR7 rig from the 1980's and from the day I broke open all those new factory sealed Drake boxes way back then until I replaced it, it functioned trouble-free, so what do I know about stuff that goes wrong or fixing it? (Answer: Not much!) I did share the remedy Ron Baker applied to my recently acquired TR7 that in retrospect I should have posted to the group. At the time, as far as I knew, it was knowledge and would have been just a lot of QRN. I won't be so concerned from now on. Far be it for me, a newcomer, to criticize how the list is run, but (here it comes) I don't understand why there's a response to both an individual and to the list. I realize that some may subscribe to a daily digest and maybe the thought is the redundancy is so they'll get their reply right away, but why burden the real-time members with duplicate mailings? Based on a time I was getting a hundred or so mailings decades ago from several discussion lists, many of them duplicates, I'd vote for the option to reply to the list, or to the individual at the respondent's option. 73! Tony Stalls, K4KYO Arlington, VA I think the reply function is set up by the list administrator but it may vary with the mail client. In Outlook Express if I choose reply for this list my message goes only to the original poster, not the list. If I choose reply all my message goes to both original poster and the list unless I edit the To field to eliminate the original poster. I belong to other lists that work this way but the majority of them are set up so that reply goes only to the list and reply all goes to both list and original poster. That can be edited if one wishes to reply off list. I much prefer the latter set up but the administrators of the lists using the former defend their choice. I have learned to be careful to see who is getting replys and tailor them as required. It did take me a while to figure out what was going on since all of the lists subscribed to first used the first method, i.e., reply went to the list. I also agree about the second method sometimes providing help to the orignal poster that does not go to the list archive if one is kept. I think the arrangement of requiring reply all to reply to a list can reduce the value of the list as a forum for mutual discussion of subjects and can also result in multiple messages to the original posters, or to every participant in a particular post in some lists. IMO this is counter to the whole idea of a mail reflector. However, the list owners are the ones to decide and I have just learned to work with whatever is there. Richard - We discussed the 'Reply To' situation on this list some time ago. I at least found it interesting, since the 'authority' was that was the the way it was done, from the 'beginning'. I have to admit, it does gain some support in that just about every email client offers both Reply and Reply All, so ... I've been using e-mail since about 1975 on ARPANET, and this is the first time it has been questioned! :-) Kind of like 'reply AFTER quoted material'. So there are reasons for it to be this way. Unfortunately, this type of 'list' really works better if BOTH are reversed from the norm. You can see most contributions to a subject, AND they end up in the archives. Coming in in the middle of a thread, you can read the latest contribution right at the top, and if you need further context or want to see what went before (assuming you haven't already read it as it was added, you can scroll down. The WORST situation is if there is a combination of TOP and BOTTOM adds, and I usually just skip those! :-) By the way, 'cross-posting' (sending one message to six different lists with one email) is frowned upon by most list managers. It causes all sorts of management problems when the message includes a list that only some or none of the other list members subscribe to. When THEY Reply All bounce messages are generated, which are then sometimes sent to the list again, which ... I screwed up the other day by sending a message to an individual with an attachment, AND copying it to the list. 'Most' lists just strip off the attachment and pass the message portion through. Not this one! I get an automated 'bounce' message that says the message is being 'held for moderator approval', with a link to just cancel the message. At least Thom didn't have to attend to it!! Bottom line, 'Nothin's Ever Easy'. :-) 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
Re: [Drakelist] AC4 heat
OK..I added the AC4 pix to the Drake fan install photo album I have on Picassa: The pix of the AC4 show an older AC4 that I havent yet changed over to the Silenx fans. They are amazingly quiet and are available in several different sizes, colors, and air flows. I now use the Silenx on my TR7 and its PS, Tr4, Tr3, R4/T4 AC4 and a few other places. I need to change them all over inside my PC's also cuz now the computers are the loudest fans in the shack! These are all the 80mm models but they also make 120mm styles that are awesome as well and just as quiet. I will add the R4 fan install and baffle pix to the collection soon. It makes a HUGE difference in the heat getting to the power transformer and right side panel of the Rx from the audio tube---along the way, keeps the start-up VFO drift to a much lower value. http://picasaweb.google.com/captcurt08/DrakeFanInstall# kc9...@aol.com wrote: Curt, I would love a photo or two of how you cooled your AC-4. Also, My L-4B PS runs super hot and I need to do soething with it too. 73 Lee -Original Message- From: Curt Nixon cptc...@flash.net To: Dick KF4NS kf4nsra...@verizon.net Cc: drake dr...@mailman.qth.net; DrakeRadio list drakera...@yahoogroups.com; Drake list at zerobeat drakelist@zerobeat.net Sent: Mon, Dec 13, 2010 7:05 pm Subject: Re: [Drakelist] AC4 heat Generally, transformers can and do run hot enough that you can't leave your hand on them for very long. They will be fine like this..but...heat does deteriorate plastics and varnishes like that used inside. Electrolytic caps also have reduced lifetimes depending on heat. So I have elected to add a silenx super quiet fan to my AC4. I drilled a series of holes in a pattern to match the 80mm fan. The fan is mounted on one end of the long side of the aluminum cover. It has holes along the sides to allow air IN so the fan draws air OUT. If you want to see pictures of this, I can take a few. I agonized over doing this to the cover but have no regrets at this point...The PS runs cool enough that it is hard to tell it is on. It still fits inside the MS4 if required, and is dead quiet. These silenx fans are about 7.00 bucks. I added similar fan to the PS for my TR7 as well. Many commercial power supplies use fans for continuous operation even though the transformers are rated to run at elevated temperatures. FWIW Curt KU8L Dick KF4NS wrote: A while back I recall a discussion about the heat in the AC4/AC4R. Now that my rig is back in the shelf along with the PS in the MS-4, I notice that the back of the AC4R is too hot to touch for more than a couple seconds. I worry about cooking the xfmr too much. I could put a fan on the rear apron, and if so, is there a preference on the location? Also, would it make any difference which direction the air flow goes? 73, Dick KF4NS St Petersburg, FL 33714 USA Keep The Glow! ___ 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 mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Manual Needed
A few questions - - I am not sure if I have the correct manual, if you or someone want to send one to me, I can process it. - Are you able to access Google Documents? Below is an example of what I can have generated with very little effort. If it looks good to you, I can send them all to you via google docs or in a big email. This document contains text automatically extracted from a PDF or image file. Formatting may have been lost and not all text may have been recognized. To remove this note, right-click and select Delete table. DRAKE less the switch is depressed. This function must be defeated or VOX operation will be impossible. 2-6. GROUND REOUI REMENTS. For best results, the T-4XC should be attached to a good earth ground through as short and as heavy a piece of ground braid as possible. A binding post is provided on the rear of the chassis for this pur- pose (see ñgure 2-2). 2-7. RECEIVER MUTING. The RCVR MUTE jack provides a short circuit to ground on receive, and an open circuit on transmit. This jack can be connected directly to the Mute jack on the R-4A, R-4B or R-4C`Receiver with one of the cables provided. 2-8. RECEIVER ANTENNA SWITCHING. The T-4XC contains built-in receiver antenna switching. Simply connect one of the coax cables provided from the RCVR ANT jack on the rear of the T-4XC chassis to the receiver antenna terminals. 2-9. ANTI VOX AND SIDETONE. The Anti Vox input and CW sidetone output utilizes the ANTI VOX jack on the rear of the T-4XC chassis for connecting to the receiver and speaker. The impedance at this point is approxi¿ mately 5000 Ohms. To connect to the R-4, R-4A, R-4B or R-4C Receiver, simply couple the ANTI VOX jack to the ANTI VOX jack on the rear of the receiver chassis with one of the cables provided. If the R-4, R-4A, R-4B or R-4C is not used, it will be necessary to use a 5000 Ohm to 4 Ohm audio output transformer between the ANTI VOX jack and the speaker terminal of the receiver. The high impedance winding of the transformer should be connected to the ANTI VOX jack and the low impedance winding should be connected to the receiver speaker terminals in parallel with the speaker. An alternate connection for this jack would be to the plate of the receiver audio output tube. A DC blocking capacitor must be provided in the receiver. 2-10. INJECTION. Refer to figure 2-4. In order to transceive with the R-4, R-4A, R-4B or R-4C Receiver, run a cable from the INI jack on the rear of the T-4XC chassis to the INJ jack on the top of the R-4 or on the back of the R-4A, R-4B or R-4C chassis. This cable will provide both RF and control voltage. Be sure to use one of the low capacity injection cables for this connection. 2-11. R-4C CARRIER OSCILLATOR INJECTION. The 5.645 MHZ oscillator injection in the R-4C can be supplied from the T-4XC by connecting a cable between the Carrier Oscillator jacks of the two units. This phaselocks the two units to the same frequency on SSB when the TRANSCEIVE switch is in the Receive or Transmit position. No connec- tion is made to this jack when using the R-4, R-4A or R-4B. Be sure to use one of the low capacity injection cables for this connection. 2-12. R-4C PTO LAMP SWITCHING. Refer to figure 2-4. The Permeability Tuned Oscil- lator (PTO) pilot light in the R-4C is controlled by the TRANSCEIVE switch in the T-4XC when a cable is connected between the PTO lamp jacks on the two units. When this connection is made, the receiver PTO lamp will be on when the re- ceiver PTO is controlling the frequency on receive and transmit. The transmitter PTO lamp will be on when the transmitter PTO is controlling frequency in both receive and transmit and both PTO lamps will light when independent frequency control is used. No connection is made to the PTO lamp jack when using the R-4, R-4A or R-4B. 2-13. USING THE T-4XC WITH R-4 RECEIVER. When the T-4XC is used with the R-4 Receiver, one change must be made in the R-4 for proper transceive operation. Change R71, a 150 K resistor, (from pin 1 of the 6AU6 VFO tube V11), to a 330 K. This will not affect the operation of the receiver in any other way. NOTE: This does not apply to R-4A, R-4B or R-4C Receivers. RING SHIELD TIP Figure 2-7. Microphone Connect/ons 2-14. USING THE T-4XC WITH SPR-4 RECEIVER. When the is used with the SPR~4 Receiver with a TA-4 Transceive Adapter board installed, two resistors must be added to the Add an 8.2 K resistor from the 12 volt B+ line to the POW MUTE jack. Add a 2.2 meg resistor on the back of the TA-4 board in parallel with R3, a 1 meg resistor. 2-15. LINEAR AMPLIFIER CONNECTION. In order to use your T-4XC with a linear ampli- fier, connect as illustrated in figure 2-5. Note that if the linear amplifier has negative-going trans- mitting AGC voltage available, it can be connected to pin 3 of the power connector, connection available at jack on AC-4, to prevent the linear from being overdriven by the T-4XC. For con- nections to the Drake L-4 or L--4B Linear
Re: [Drakelist] TR7 issue
On Tue, 14 Dec 2010 14:56:42 -0500, Garey Barrell wrote: We discussed the 'Reply To' situation on this list some time ago. I at least found it interesting, since the 'authority' was that was the the way it was done, from the 'beginning'. What's missing from this equation was that, in the beginning, most mailing list users arguably were computer-savvy geeks, scientific or technical people, educators and/or students of higher learning, etc., who at least had a clue about Reply to All. Nowadays, a large percentage of users are relatively computer illiterate and often barely know where the Reply button is, let alone Reply To. (These are the same folks who don't know that the mouse cursor and Delete key can be used to remove unnecessary quoted text). Heck, I had to explain to a cousin of mine that Outhouse Express did indeed support BCC:, and where she could find it! And I only use Microsoft email products at work, as little as possible, and only because I have to. I suspect most of the time the relies don't go to the list simply because the user doesn't know any better. It could be said that education is the answer to this problem, but who knows how much good stuff is lost before it sinks in? 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://radiojim.exofire.net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] AC4 heat
Hi Dick: Got a batch from Tigerdirect.com They are very fast to ship..excellent website, and good prices over the long haul. I pretty much use them for all PC related stuff over the course of several years now. Also bought a couple on eBay but the cost ended up being nearly same and shipping weas actually slower. I think Tiger comes from Chicago area if I recall..they get stuff to me the second day after order even with just ground standard delivery. I see the price for the ones I got is now 10.99. IXP 5414 14dBA 32CFM. THese are the ones I used most of...the Thermister controlled speed version is IXP 5414T and a dollar more. I believe that the IXP5211 18CFM version would be plenty for the AC4 But same price. I got mine on a sale about a year ago or more but I have also seen them on line for that 7-8 dollar figure. Shipping makes the prices all about the same. I didn't shop for the absolute lowest price on these..I do alot of business with Tiger so just got about a dozen of these from them. Curt Dick KF4NS wrote: Thanks Curt, I appreciate the thoroughness of your reply. Where do you buy the silenx fans? I will most likely get 2 of the 80/80 and maybe 2 of the 60. On the company website they give retailers but all are selling them for around $12 or more. What model numbers do you have? 73, Dick KF4NS St Petersburg, FL 33714 USA Keep The Glow! - Original Message - From: Curt Nixon cptc...@flash.net To: Dick KF4NS kf4nsra...@verizon.net Cc: DrakeRadio list drakera...@yahoogroups.com; Drake list at zerobeat drakelist@zerobeat.net; dr...@mailman.qth.net Sent: Monday, December 13, 2010 7:02 PM Subject: Re: [Drakelist] AC4 heat Generally, transformers can and do run hot enough that you can't leave your hand on them for very long. They will be fine like this..but...heat does deteriorate plastics and varnishes like that used inside. Electrolytic caps also have reduced lifetimes depending on heat. So I have elected to add a silenx super quiet fan to my AC4. I drilled a series of holes in a pattern to match the 80mm fan. The fan is mounted on one end of the long side of the aluminum cover. It has holes along the sides to allow air IN so the fan draws air OUT. If you want to see pictures of this, I can take a few. I agonized over doing this to the cover but have no regrets at this point...The PS runs cool enough that it is hard to tell it is on. It still fits inside the MS4 if required, and is dead quiet. These silenx fans are about 7.00 bucks. I added similar fan to the PS for my TR7 as well. Many commercial power supplies use fans for continuous operation even though the transformers are rated to run at elevated temperatures. FWIW Curt KU8L Dick KF4NS wrote: A while back I recall a discussion about the heat in the AC4/AC4R. Now that my rig is back in the shelf along with the PS in the MS-4, I notice that the back of the AC4R is too hot to touch for more than a couple seconds. I worry about cooking the xfmr too much. I could put a fan on the rear apron, and if so, is there a preference on the location? Also, would it make any difference which direction the air flow goes? 73, Dick KF4NS St Petersburg, FL 33714 USA Keep The Glow! ___ 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] AC4 heat
Good info. These rigs aren't getting any younger. If I remember my reliability info, every 10 deg C reduction in temp doubles the component life time. It's not that hard to do if all you need to do is move a little air. John K5MO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
