Re: [Drakelist] Need a fan for my T-4XC Transmitter?
Everything on my radio bench is plugged into a suitably large power strip (I run my T4X barefoot). The wall wart for the fan is plugged into it, as is the soldering iron. This has the benefit of ensuring nothing is left on unintentionally. Chuck, K1OM On Sat, Jan 7, 2012 at 5:33 PM, Michael Sue Trussell mtruss8...@comcast.net wrote: I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don’t have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? ** ** Thank you in advance ** ** Michael J Trussell KA8ASN ___ 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] Jean-Marie Cherry (Drake Virtual Museum) has passed away
To everybody on the list: I'm very sorry to inform you that my friend and companion with the R.L. Drake Virtual Museum ( http://www.dproducts.be/drake_museum/) , Jean-Marie Cherry passed away on December 26, 2011. The funeral took place January 4, 2012. He died of lung cancer. Jean-Marie and I had the museum together on equal basis. The R.L. Drake Virtual Museum will continue as you know it today, and I will take care of it all from now on. And you will indefinitely still find it here http://www.dproducts.be/drake_museum I began some weeks ago the work with a new and complete updated version of The R.L. Drake Virtual Museum which will be launched part by part. The files will also be moved to another server as part of this job. I will keep you posted here. This work will be forced from now on. All kind of requests, new stuff for The R.L. Drake Virtual Museum etc. should hereafter be directed to me. Ideas for the new and updated museum are also most welcome. My e-mail is sindt...@online.no, and cell phone + 47 - 90685749 I indeed hope for your continued support for The R.L. Drake Virtual Museum. Greetings on this list will be most appreciated. Thanks for your attention. 73, Sindre Torp, LA6OP The R.L. Drake Virtual Museum___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] L-7 fan failure due to heat
Fellow enthusiasts, I'm wondering if any users of the Drake L-7 linear amplifier have experienced fan noise and lock-up due to excessive heat. If so, I wonder how the problem was solved. Other than the fan problem, amplifier operates properly, with correct output, on all bands. The fan problem started about a year or more ago and I've worked on it on and off since then with no progress. Prior to that, the amp worked fine. How do I know the problem is heat? Well, let me give you a brief description of some things done so far with no improvement. Fan replaced four times with new models from different vendors. Thermostat replaced twice. Dropping resistor replaced several times. Wiring in fan circuit replaced. Fan wired directly to 110 vac with no change. Known good tubes swapped with no change. Here is how the problem can be induced. With the amplifier on, standby, CW or SSB, tubes in or out, the fan will run continuously as it should, and with no problems. If the amplifier is used on the air, regardless of CW or SSB mode, regardless of power level, the fan will start making noise and eventually stop. If the amp is allowed to cool down, things start working normally. In amp is put into transmit, with normal plate idling current, and NO input power (and thus no output power), the fan will start making noise and then stop after approximately 5-10 minutes. Allowing the amp to cool down, the process can be replicated with consistency. Note too, when the amp is operated normally and the fan uses the power source via the amp wiring, the fan will start making noise and eventually stop without it ever switching into high speed mode. If you have experienced such a problem and have solved it, I would be interested in hearing what the solution is. I have two other L7s that operate flawlessly so I'm still on the air but I like to keep my gear in proper operating condition if possible. Enjoy those Drakes! And don't forget the Drake HF nets. 73, Evan, K9SQG ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] L-7 fan failure due to heat
*Evan, as you know that is exactly the way mine did, I think I about drove you crazy trying to figure mine out. But since I went to the different fan from All Electronics for I think about $7 and * * also I replaced the resistor* *, I have had no problem. Now the Amp works great and I use it quite a lot.* *Woody * -- * ** **Of **all the things I've L**ost, I miss my Mind the Most~~~* * If you forward this e-mail, please delete the forwarding history* *Thanks* *Woody* ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR4 Power
I have a TR4 that, according to the manual, should have an output of 300 watts. I am getting about 110 watts. Am I doing something wrong or is there a problem? Greg N4WVE -- Sent from my Android phone with SkitMail. Please excuse my brevity.___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR4 Power
Greg - When the TR-4 was first sold, transmitters were specified as _INPUT_ power to the PA stage, because that was the way the FCC regulations defined transmitter power in the Ham Radio regulations. This is the 300W specified in the manual. With NEW PA tubes and perfect alignment, you should get close to 200W on 80, 40 and 20M, 175W on 15M 150W on 10M. These are _OUTPUT_ power. This is the way the FCC regulations define transmitter power today. The change was primarily the result of the availability of reasonably accurate wattmeters beginning in the 70's. Your PA tubes are probably a little weak, and the alignment could probably use a touch-up. Your readings are typical for a transceiver in need of a 'tune-up'! :-) 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 Greg Hemmings N4WVE wrote: I have a TR4 that, according to the manual, should have an output of 300 watts. I am getting about 110 watts. Am I doing something wrong or is there a problem? Greg N4WVE ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Need a fan for my T-4XC Transmitter?
I've done all which-ways. I once used a 120V fan and used a big, honkin' wire-wound resistor to slow it down. I currently use a 12V fan with a thermistor over my finals, running off a 12V wall wart. the fan runs really slow until the temp gets to the point where the thermistor lets it go for full-speed. This fan cost me $5 at a hamfest. I've worked on a couple of R-4B's where the previous owner tapped off the filament supply with a diode and cap (half-wave rectifier). The fans he used are a little louder than my Xmitter fan. If you opt for using on-board power, you can tap off the filament supply for 12V and feed it to an RCA jack in the SPARE location, or just feed wires through that hole. I like just setting the fan on top, using rubber feet. No holes get drilled that way... YMMV, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: Michael Sue Trussell Sent: Saturday, January 07, 2012 5:33 PM To: drakelist@zerobeat.net Subject: [Drakelist] Need a fan for my T-4XC Transmitter? I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN ___ 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] Need a fan for my T-4XC Transmitter?
I've used a couple silicon diodes in series in a sleeve of shrink wrap to slow the fDC ans down a bit too... or, use a 9V wall wart. The fans are almost free these days and it doesn't take a huge one to make a big difference in the temp in the radio. 73 John K5MO At 07:45 PM 1/8/2012, Steve Wedge wrote: I've done all which-ways. I once used a 120V fan and used a big, honkin' wire-wound resistor to slow it down. I currently use a 12V fan with a thermistor over my finals, running off a 12V wall wart. the fan runs really slow until the temp gets to the point where the thermistor lets it go for full-speed. This fan cost me $5 at a hamfest. I've worked on a couple of R-4B's where the previous owner tapped off the filament supply with a diode and cap (half-wave rectifier). The fans he used are a little louder than my Xmitter fan. If you opt for using on-board power, you can tap off the filament supply for 12V and feed it to an RCA jack in the SPARE location, or just feed wires through that hole. I like just setting the fan on top, using rubber feet. No holes get drilled that way... YMMV, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: mailto:mtruss8...@comcast.netMichael Sue Trussell Sent: Saturday, January 07, 2012 5:33 PM To: mailto:drakelist@zerobeat.netdrakelist@zerobeat.net Subject: [Drakelist] Need a fan for my T-4XC Transmitter? I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN -- ___ 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] Yet another AC-4 rebuild (now :-) completed
Mark, that is a nice description of the AC-4 rebuild. Thank you for sharing it with us. I have done a few of them but using Mike's (Solar) approach. I confess that I did not strip it all down and scrube the chassis! Very good idea to use new bushing etc. I have gambled on the old switches holding out - so far so good. Kris KM2KM - Original Message - From: Mark Pilant n1...@arrl.net To: drakelist drakelist@zerobeat.net Sent: Sunday, January 08, 2012 11:05 AM Subject: Re: [Drakelist] Yet another AC-4 rebuild (now :-) completed OK, now the rebuild is really complete. Yesterday I added the relay to take the load off the On/Off switch. Here are pictures and a description of what I did: http://www.n1vqw.net/ac4rebuild/#phase2 Before the addition of the relay, I measured a current draw of about 325 mA with the power supply unloaded. This would also be the current on the On/Off switch contacts. Since this was on an unloaded power supply, I would expect this to rise when transmitting. After the addition of the relay, this current (from the relay coil) seen by the switch contacts dropped to just a bit over 10 mA. This is a substantial drop, and should make the switch contacts last much longer. Oh yes, comments, corrections, and suggestions welcome. 73 - Mark N1VQW ___ 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] Need a fan for my T-4XC Transmitter?
or you could use one of my new fan controllers for the drake radios mike On Jan 8, 2012, at 7:45 PM, Steve Wedge wrote: I've done all which-ways. I once used a 120V fan and used a big, honkin' wire-wound resistor to slow it down. I currently use a 12V fan with a thermistor over my finals, running off a 12V wall wart. the fan runs really slow until the temp gets to the point where the thermistor lets it go for full-speed. This fan cost me $5 at a hamfest. I've worked on a couple of R-4B's where the previous owner tapped off the filament supply with a diode and cap (half-wave rectifier). The fans he used are a little louder than my Xmitter fan. If you opt for using on-board power, you can tap off the filament supply for 12V and feed it to an RCA jack in the SPARE location, or just feed wires through that hole. I like just setting the fan on top, using rubber feet. No holes get drilled that way... YMMV, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: Michael Sue Trussell Sent: Saturday, January 07, 2012 5:33 PM To: drakelist@zerobeat.net Subject: [Drakelist] Need a fan for my T-4XC Transmitter? I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don’t have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN ___ 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
[Drakelist] TR4C needs a good home
Gents, I have a TR4C station setup that I need to part with. I have to lighten the load on the radio table.so to speak. I have a TR4C, sn 40655 with noise blanker PNB-34 RV4C, sn 19585 AC4 sn 41360 DC4 2559 All units are in good to very good/excellent condition, no marks or scratches. I did have to pad the TR4 to transmit on CW in the right place.might need alignment?? I have all the interconnecting cables and original Drake manuals with these units. Contact me off line for information and pictures. Regards Ralph, VE7OM Ralph Webb Tel: 604-531-2662 Cel: 604-218-2614 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Digital Readout for TR-3 and TR-4
I have a Palomar PD-700 digital readout that I believe should work with the TR-3 or TR-4. Of course there are no schematics or manuals available for this unit anymore. I can get the unit to readout and track the 5mhz vfo but cannot figure out where to connect the oscillator to give actual frequency readout. Anyone have experience in connecting a digital readout to either the TR-3 or the TR-4? I have both and would settle for being able to get it to work with either one. Thanks; Dan___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Fans
Okay here's another way to go at the fan plan question I wire two 110 vac fans in series so they run half speed. I can't hear them at all yet they move a good deal of air. The one above the finals on my TR4Cw is blowing straight up and the one in the front top in the middle is blowing in. I get a circular air flow pattern and the entire transceiver never even approaches warm. Just to make sure, (and for fun) I have a thermometer on top of the fan which sets on top of the one on the finals and the temperature hardly changes at all. To keep the fans stationary I use 4 pieces of coax seal rolled in a ball about half the size of a pea to serve as feet on each corner of the fan. It won't stick permanently but it will keep the quite stationary. So for me the question of blow out or in is answered by doing both As for providing power I have both the AC-4 and these series wired fans in a 3 way plug which is in turn plugged into a soft start circuit. Turn on the slow start switch turns on both the AC-4 and the fans. Try the two fan approach ... No need to modify anything in the transceiver. Cooler is better, eh? Happy New Year everyone. Michael n4mak Sent from my iPhone // At 07:45 PM 1/8/2012, Steve Wedge wrote: I've done all which-ways. I once used a 120V fan and used a big, honkin' wire-wound resistor to slow it down. I currently use a 12V fan with a thermistor over my finals, running off a 12V wall wart. the fan runs really slow until the temp gets to the point where the thermistor lets it go for full-speed. This fan cost me $5 at a hamfest. I've worked on a couple of R-4B's where the previous owner tapped off the filament supply with a diode and cap (half-wave rectifier). The fans he used are a little louder than my Xmitter fan. If you opt for using on-board power, you can tap off the filament supply for 12V and feed it to an RCA jack in the SPARE location, or just feed wires through that hole. I like just setting the fan on top, using rubber feet. No holes get drilled that way... YMMV, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: mailto:mtruss8...@comcast.netMichael Sue Trussell Sent: Saturday, January 07, 2012 5:33 PM To: mailto:drakelist@zerobeat.netdrakelist@zerobeat.net Subject: [Drakelist] Need a fan for my T-4XC Transmitter? I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN -- ___ 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] Fans
Another approach I've found to work well is to use a 220 v fan that will start reliably and run consistently. Super quiet! 73, Evan, K9SQG -Original Message- From: Michael Kelly mkell...@gmail.com To: drakelist drakelist@zerobeat.net Sent: Sun, Jan 8, 2012 4:57 pm Subject: [Drakelist] Fans Okay here's another way to go at the fan plan question I wire two 110 vac fans in series so they run half speed. I can't hear them at all yet they move a good deal of air. The one above the finals on my TR4Cw is blowing straight up and the one in the front top in the middle is blowing in. I get a circular air flow pattern and the entire transceiver never even approaches warm. Just to make sure, (and for fun) I have a thermometer on top of the fan which sets on top of the one on the finals and the temperature hardly changes at all. To keep the fans stationary I use 4 pieces of coax seal rolled in a ball about half the size of a pea to serve as feet on each corner of the fan. It won't stick permanently but it will keep the quite stationary. So for me the question of blow out or in is answered by doing both As for providing power I have both the AC-4 and these series wired fans in a 3 way plug which is in turn plugged into a soft start circuit. Turn on the slow start switch turns on both the AC-4 and the fans. Try the two fan approach ... No need to modify anything in the transceiver. Cooler is better, eh? Happy New Year everyone. Michael n4mak Sent from my iPhone // At 07:45 PM 1/8/2012, Steve Wedge wrote: I've done all which-ways. I once used a 120V fan and used a big, honkin' wire-wound resistor to slow it down. I currently use a 12V fan with a thermistor over my finals, running off a 12V wall wart. the fan runs really slow until the temp gets to the point where the thermistor lets it go for full-speed. This fan cost me $5 at a hamfest. I've worked on a couple of R-4B's where the previous owner tapped off the filament supply with a diode and cap (half-wave rectifier). The fans he used are a little louder than my Xmitter fan. If you opt for using on-board power, you can tap off the filament supply for 12V and feed it to an RCA jack in the SPARE location, or just feed wires through that hole. I like just setting the fan on top, using rubber feet. No holes get drilled that way... YMMV, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: mailto:mtruss8...@comcast.netMichael Sue Trussell Sent: Saturday, January 07, 2012 5:33 PM To: mailto:drakelist@zerobeat.netdrakelist@zerobeat.net Subject: [Drakelist] Need a fan for my T-4XC Transmitter? I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN -- ___ 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Yet another AC-4 rebuild (now :-) completed
Excellent job. The relay is certainly an effective way to protect that switch. However ... A simple power strip with enough outlets for a single station solves the AC switch problem. The key is to switch the equipment on -OR- off _only_ when the power strip switch is OFF. None of our boatanchor equipment has an easily power switch, most are on the back of a potentiometer. I don't use ANY boatanchor power switches 'hot' any more. 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 Kris Merschrod wrote: Mark, that is a nice description of the AC-4 rebuild. Thank you for sharing it with us. I have done a few of them but using Mike's (Solar) approach. I confess that I did not strip it all down and scrube the chassis! Very good idea to use new bushing etc. I have gambled on the old switches holding out - so far so good. Kris KM2KM - Original Message - From: Mark Pilant n1...@arrl.net To: drakelist drakelist@zerobeat.net Sent: Sunday, January 08, 2012 11:05 AM Subject: Re: [Drakelist] Yet another AC-4 rebuild (now :-) completed OK, now the rebuild is really complete. Yesterday I added the relay to take the load off the On/Off switch. Here are pictures and a description of what I did: http://www.n1vqw.net/ac4rebuild/#phase2 Before the addition of the relay, I measured a current draw of about 325 mA with the power supply unloaded. This would also be the current on the On/Off switch contacts. Since this was on an unloaded power supply, I would expect this to rise when transmitting. After the addition of the relay, this current (from the relay coil) seen by the switch contacts dropped to just a bit over 10 mA. This is a substantial drop, and should make the switch contacts last much longer. Oh yes, comments, corrections, and suggestions welcome. 73 - Mark N1VQW ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Digital Readout for TR-3 and TR-4
Dan - No real difference between the '3 and '4. The only practical place to pick off the frequency is at the output of V3a. Obviously this requires a counter that is 'offsettable' by the 9 MHz Carrier oscillator. A second offset would be required for CW readout. On the other hand, do you _really_ need to know your frequency to better than a half kHz??? 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 Daniel Cox wrote: I have a Palomar PD-700 digital readout that I believe should work with the TR-3 or TR-4. Of course there are no schematics or manuals available for this unit anymore. I can get the unit to readout and track the 5mhz vfo but cannot figure out where to connect the oscillator to give actual frequency readout. Anyone have experience in connecting a digital readout to either the TR-3 or the TR-4? I have both and would settle for being able to get it to work with either one. Thanks; Dan ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Digital Readout for TR-3 and TR-4
Many potentiometers having a switch on the back are common in that the switch will fit several different controls. I have found many of these on NOS and used pots at hamfests and I always buy several, especially new ones. It is nice to get several since they are prone to getting lost in the junque pile at home. The purpose of this is to remind you that if your switch dies, there is still hope. Not so the L-4B and L-7 switches although I have heard of some fellows who were able to repair them. Garey's power strip idea is an excellent way to take the load off the equipment mounted switch but I am a bit of a nut then it comes to turning on a piece of great with the internal switch. Yes, matching and replacing the switch can be a real exercise in patience since many times, the entire control has to be removed to replace the switch on the back. If you don't mind scrounging and a bit of work, you can keep your gear original, at least when it comes to powering it up. By the way, Garey's idea is a great way to make sure all the gear connected to it is off and in a storm, pulling that single strip plug and disconnecting antennas may save you from electrical storm damage. This goes for other makes of boatanchors also. 73, John, W4AWM___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Fans
I use 220VAC fans all the time on my Drake gear. The work well and are quiet. They are generally available used at ham fests for cheap money as no one wants a 220V fan... 73 Gene K1NR On Sun, 8 Jan 2012 22:11:11 -0500 (EST) K9sqg k9...@aol.com wrote: Another approach I've found to work well is to use a 220 v fan that will start reliably and run consistently. Super quiet! 73, Evan, K9SQG -Original Message- From: Michael Kelly mkell...@gmail.com To: drakelist drakelist@zerobeat.net Sent: Sun, Jan 8, 2012 4:57 pm Subject: [Drakelist] Fans Okay here's another way to go at the fan plan question I wire two 110 vac fans in series so they run half speed. I can't hear them at all yet they move a good deal of air. The one above the finals on my TR4Cw is blowing straight up and the one in the front top in the middle is blowing in. I get a circular air flow pattern and the entire transceiver never even approaches warm. Just to make sure, (and for fun) I have a thermometer on top of the fan which sets on top of the one on the finals and the temperature hardly changes at all. To keep the fans stationary I use 4 pieces of coax seal rolled in a ball about half the size of a pea to serve as feet on each corner of the fan. It won't stick permanently but it will keep the quite stationary. So for me the question of blow out or in is answered by doing both As for providing power I have both the AC-4 and these series wired fans in a 3 way plug which is in turn plugged into a soft start circuit. Turn on the slow start switch turns on both the AC-4 and the fans. Try the two fan approach ... No need to modify anything in the transceiver. Cooler is better, eh? Happy New Year everyone. Michael n4mak Sent from my iPhone // At 07:45 PM 1/8/2012, Steve Wedge wrote: I've done all which-ways. I once used a 120V fan and used a big, honkin' wire-wound resistor to slow it down. I currently use a 12V fan with a thermistor over my finals, running off a 12V wall wart. the fan runs really slow until the temp gets to the point where the thermistor lets it go for full-speed. This fan cost me $5 at a hamfest. I've worked on a couple of R-4B's where the previous owner tapped off the filament supply with a diode and cap (half-wave rectifier). The fans he used are a little louder than my Xmitter fan. If you opt for using on-board power, you can tap off the filament supply for 12V and feed it to an RCA jack in the SPARE location, or just feed wires through that hole. I like just setting the fan on top, using rubber feet. No holes get drilled that way... YMMV, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: mailto:mtruss8...@comcast.netMichael Sue Trussell Sent: Saturday, January 07, 2012 5:33 PM To: mailto:drakelist@zerobeat.netdrakelist@zerobeat.net Subject: [Drakelist] Need a fan for my T-4XC Transmitter? I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN -- ___ 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 - Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.com/ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
