Re: [drakelist] Confessions of an Appliance Operator
Dennis Monticelli [EMAIL PROTECTED] made an utterance to the drakelist gang -- This is the same scheme that I use. It is flexible, quiet, and completely non-invasive. Also, I second the recommendation on the Panasonic Panaflo line. They are clearly superior to the PC grade fans coming out of China. Another tip: buy a larger fan and run it slower. It will move the same amount of air as a small fan run at full speed yet make much less noise. Also its reach is better so the warm air is drawn in over a wider area. Dennis AE6C On Dec 23, 2007 1:44 PM, john [EMAIL PROTECTED] wrote: john [EMAIL PROTECTED] made an utterance to the drakelist gang -- An option I use is a DC wall wart with selectable secondary voltage, so that you can move the fan (on rubber feet) from rig to rig, and adjust the fan speed with the voltage on the wall wart. They're less than ten bucks. 9V on a 12v fan is a happy medium. John K5MO -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] R-4 Crystal Replacement(s)
Good Morning All, If you take a moment to click onto this site http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemrd=1item=220185518740ssPageName=STRK:MEWA:ITih=012 it will become readily apparent why I'm experimenting here with the notion of using a dedicated RF signal generator as a replacement for any HC-6/U band crystals at the back of my new R-4 receiver! With days still to go on this auction, it's already approaching the price of the entire Drake Twins station that I purchased here the other day... BTW, the notion of a signal-generator-cum-crystal-substitute is a viable one: I played about with mine yesterday, and managed to copy all manner of shortwave medium wave stuff on the rig, ...for free. The injection level of RF voltage into the crystal socket is important, though: I obviously never had enough soup from my WW2-vintage generator, because S-meter side-by-side comparisons --- i.e. the signal strength of a BC station, crystal vs. generator --- showed that I needed a lot more horsepower out of the generator than it was capable of delivering... A solidstate, compact generator --- with a built-in crystal calibrator --- is in order here for casual SWL'ing. For the Ham bands, though, I still prefer the rockbound route... ~73~ Eddy VE3CUI - VE3XZ
Re: [drakelist] Confessions of an Appliance Operator
Eugene Balinski [EMAIL PROTECTED] made an utterance to the drakelist gang -- All, One of the other solutions that is easy and quiet it to use a 24 volt DC fan and run it off of your station 12V DC supply. These fans are usually cheap and are in generally in ample supply at local ham fests (at least here in New England). They come in many sizes. As mentioned below, the larger ones are better for this application. Simply place the fan on top of the finals, use a couple of plastic screw as off-set feet to avoid scratching the cabinet, wire it to 12VDC, and you are done. Cool Finals. 73, Merry Christmas and Happy New Year to all. Gene K1NR On Mon, 24 Dec 2007 01:55:53 -0800 Dennis Monticelli [EMAIL PROTECTED] wrote: Dennis Monticelli [EMAIL PROTECTED] made an utterance to the drakelist gang -- This is the same scheme that I use. It is flexible, quiet, and completely non-invasive. Also, I second the recommendation on the Panasonic Panaflo line. They are clearly superior to the PC grade fans coming out of China. Another tip: buy a larger fan and run it slower. It will move the same amount of air as a small fan run at full speed yet make much less noise. Also its reach is better so the warm air is drawn in over a wider area. Dennis AE6C On Dec 23, 2007 1:44 PM, john [EMAIL PROTECTED] wrote: john [EMAIL PROTECTED] made an utterance to the drakelist gang - Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.com/ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Confessions of an Appliance Operator
[EMAIL PROTECTED] made an utterance to the drakelist gang -- I use specially selected 220v fans that start and run reliably at 110 v. Can't hear them and they are the ones I use on L4B/L7 power supply upgrades/rebuilds. Merry Christmas from a politically incorrect Drake enthusiast! **See AOL's top rated recipes (http://food.aol.com/top-rated-recipes?NCID=aoltop000304) -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] Cooling Fan on finals
Howard Traxler [EMAIL PROTECTED] made an utterance to the drakelist gang -- A-way back in the day, when my first Drake twins were new to me--that would be the late 60's--I was told that the xmtr was designed to run at that temperature and that I'd have drift problems if I ran it cooler. I never did any hard core testing to find out. WA9RYF - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, December 24, 2007 1:18 PM Subject: Re: [drakelist] Confessions of an Appliance Operator : [EMAIL PROTECTED] made an utterance to the drakelist gang -- : I use specially selected 220v fans that start and run reliably at 110 v. : Can't hear them and they are the ones I use on L4B/L7 power supply : upgrades/rebuilds. : : Merry Christmas from a politically incorrect Drake enthusiast! : **See AOL's top rated recipes : (http://food.aol.com/top-rated-recipes?NCID=aoltop000304)-- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.17.8/1195 - Release Date: 12/24/2007 11:19 AM -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Cooling Fan on finals
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 24 Dec 2007 15:27:52 -0600, Howard Traxler wrote: I was told that the xmtr was designed to run at that temperature and that I'd have drift problems if I ran it cooler. Aside from Evan's comments, that doesn't seem to follow intuitively. I would think that sucking hot air out of the back of the radio would crete a more stable temperature environment inside the radio across the changes in heat generated from RX to TX. With (theoretically) the most stable temps being the farthest away from the final cage. What's in the opposite corner of the transmitter from the final cage? The PTO! Seems to me that cooling the radio would reduce drift. Aside from that, it's a scientific fact that ANY electronic component (not just toobs) will last longer when run cooler. I would prefer to err on the side of component life. 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Cooling Fan on finals
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Amazing how much mis-information flows over the internet!! Temperature stability is a function of temperature CHANGE, not absolute temperature. The reason a temperature controlled oscillator is NOT because it is heated, but because the heat is held constant by an internal, tightly temperature controlled heater. Adding a fan to any electronic equipment, especially tube based equipment, will increase the life of the tubes and components, AND will also keep the temperature constant because of the constant flow of air. Again, the object is to stabilize the temperature, not raise or lower it, to maintain frequency stability. A T-4X(any) will change cabinet temperature considerably from receive to transmit when there is no fan cooling. This is minimized by the addition of a fan, blowing air __OUT__. The object is to assist the normal convection cooling, (hot air rises,) by forcing air AWAY from the transmitter final compartment, AND the rest of the transmitter. Blowing air IN forces heated air throughout the chassis, including the PTO, causing the temperature to VARY, not stabilize. Blowing air into the transmitter reduces the heat in the final compartment, but INCREASES the heat everywhere else, varying the temperature of the PTO as well. The TR-7 is DESIGNED to have air drawn out of the chassis, for the same reasons, and the heatsink is DESIGNED to have air drawn past it as well. The cooling SYSTEM is designed to transfer heat from the final transistors to the heatsink to air being blown AWAY from the area. You can hold a small source of smoke, (candle, incense stick, etc.,) near any of the cabinet slots and smoke will be drawn INTO them when the fan is installed as designed, blowing OUT. Merry Christmas!! 73, Garey - K4OAH St Charles, IL Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] made an utterance to the drakelist gang -- Not sure I understand that comment about the drift, hi hi. The drift is a function of the thermal environment with respect to the PTO components, including any negative temperature compensating capacitors. While the transmitter will work, it will have a warm up period, and then cycles up and down as a function of the transmit duty cycle. Compensating for the former is enough of an engineering challenge, but the latter, for tube gear of the 60s, well, it is harder to address although there were some good designs out there. From a theoretical perspective, I'm not sure why the rig would run better when it is hot. A temperature compensated crystal oven obviously works better at higher stabilized temperature (above room ambient) but conventional circuits, well I'm not sure. Drift aside, the tubes will last longer with improved cooling though. -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] Drake 2B Parts Needed
Hello- I am restoring a Drake 2B and need these parts: 1 Main Tuning Knob 1 Dial Pointer ( long red one that slides with string drive) Thanks, Byron WA5THJ.
RE: [drakelist] Cooling Fan on finals
Peter Bent [EMAIL PROTECTED] made an utterance to the drakelist gang -- Just curious, has anyone actually measured the temps in the cages-- before and after? -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wagner Sent: Monday, December 24, 2007 8:18 PM To: [EMAIL PROTECTED] Subject: Re: [drakelist] Cooling Fan on finals Ron Wagner [EMAIL PROTECTED] made an utterance to the drakelist gang -- The way I went about his was a half wave (single diode) and filter cap from the 12VAC filament line. I drive a 24 volt fan drawing air out of the final cage. Turns the fan on as I turn on the rig, shuts down when turned off. Runs slow and quit, but really makes a difference on the temp of the final cage. I attach the fan to the rear of the cage (so the cabinet comes off without problems) with grommets and black nylon wire ties. This arrangement does not seem to damage the cabinet, and does a nice job cooling. As far as stability, as long as you do not blow the warm air in, it should make the rig more stable. The cabinet and associated circuits should stay much more constant in temperature. In a good oscillator design, which Drake has, it is typically temperature change that causes the drift. 73, Ron WD8SBB -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
