Re: [drakelist] DC-3 DC-4 question
Ron Wagner [EMAIL PROTECTED] made an utterance to the drakelist gang -- My DC4 has a 2 prong female socket. I assume the DC3 does as well. As far as how efficient, that is a tough one. One would think only one conversion would be best, but. 73, Ron On Mon, 9 Jan 2006 [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] made an utterance to the drakelist gang -- Question about DC-3 or DC-4... Wondering how the 110VAC is supplied to an R-4any from the supply. Also, i'm wondering if the DC-x supplies are more efficient than using an inverter to power a set of twins. thanks -- 73 Jason N1SU http://n1su.com/ -- Submissions:drakelist@www.zerobeat.net 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:drakelist@www.zerobeat.net 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] R-4B bandswitch lubrication
Ron Wagner [EMAIL PROTECTED] made an utterance to the drakelist gang -- Don, and anyone else on the list whom I may have offended. I was not try to offend anyone, or suggest anyone is not correct in statements about being careful with cleaners on the wafers and or how to clean up after a screwup. Keith, In my mind it only makes sense to try something that someone suggests may work which requires virtually no effort and is guaranteed to not do further harm before trying still more fixes. Your decision. Let us know what you do and how it turns out. Jason, I was not alive in the 50s. My experience was in the late 80s with a similar product to DeOxit which stated on the spray can that it was safe on all materials. I did not want to suggest self healing with time and heat as I do not know if DeOxit will dry from the wafers like the stuff I had. I would still be a bit worried, but to try drying is a very inexpensive if it works. 73, Ron On Sun, 8 Jan 2006, Jason Buchanan wrote: I was lucky years ago with self healing (drying of wafers) from spray Well, when the guy told me that he did this I thought he was nuts but his explanation for not being worried was that the material in the Drake rigs was not as spongy/porous like the old stuff used in TV sets in the 50s. He -- Submissions:drakelist@www.zerobeat.net 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] DC-3 DC-4 question
Robert Donnell [EMAIL PROTECTED] made an utterance to the drakelist gang -- I used to have a DC-3, for my TR-3. It has no provisions for running an R-4 or any 120V output. Both the DC-3 and DC-4 are of the design family of switching voltage alternately to one half of the center-tapped low-voltage primary of a large power transformer. And the operating power for the transmitter tube filaments is gained by using a series/parallel string arrangement, so that all can be powered from 12 VDC. I'd bet part of the design trade in the DC-4 that allows running the R-4 on a 120V winding is that the T-4X series isn't capable of as much output power (and hence not as much HV power consumption) as the TR-3/4, so there's a bit of reserve transformer capacity. Also consider that inverter transformers are designed to work with square waves, that being the output of the switching transistors. Applying square waves from the output of an inexpensive inverter to an AC-3 or AC-4 transformer may not be especially good for the long-term health of the transformer, and unless the transformer is potted or tarred, will probably cause it to buzz audibly. I'm guessing (hoping?) Drake kept that in mind when providing for operation of the R-4 on 330 Hz from the DC-4. At least one of the benefits for the DC-3/4 is that by using a frequency above 60 Hz, the transformer didn't have to have as much iron to function correctly as would be needed for an equivalent capability 60 Hz operation. Generally speaking, the big transformer type inverters are not as efficient as the current state of the art in inverters, which is that a small high-frequency switching power supply is used to generate a 160V (roughly the peak voltage of 120V sine wave) and then to alternately connect the positive and negative outputs of that power supply to the two power pins on the AC power output connector. Part of that is because of the use of MOSFETs in current designs, which have a lower voltage drop in the on state than do germanium transistors. Germanium transistors were the favorite in the early 60's for this application because of the voltage drop and power dissipation saved when using them in that high-current application. But with MOSFETs having no fixed minimum voltage drop, and ON resistances expressed in low milli-ohm values, they're now a better choice. Hope that helps! 73, Bob, KD7NM -- Original Message -- From: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] Date: Mon, 9 Jan 2006 15:59:17 -0500 (EST) [EMAIL PROTECTED] made an utterance to the drakelist gang -- Question about DC-3 or DC-4... Wondering how the 110VAC is supplied to an R-4any from the supply. Also, i'm wondering if the DC-x supplies are more efficient than using an inverter to power a set of twins. thanks -- 73 Jason N1SU http://n1su.com/ -- Submissions:drakelist@www.zerobeat.net 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 -- Sent via the WebMail system at webmail.pioneernet.net -- Submissions:drakelist@www.zerobeat.net 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] R-4B bandswitch lubrication
I used 100% DeOxit from a needle applicator on my R4B wafer switches. Being 100%, it did a good job even on the heavy oxide buildup. I was careful not to get excess on the wafers themselves even though previous wafer switch cleaings (of lesser rigs) with the 5% spray turned out just fine. Most folks use the 5% spray because it is commonly available and easy to apply. But you have to soak components in the carrier fluid just to get a decent amount of active ingredient on the contacts themselves. One advantage to the spray is the washing effect of the runoff. A further disadvantage is having that runoff coat everything in the vicinityanother reason why I'm increasingly just rifle shooting with the 100% stuff. Denny AE6COn 1/8/06, Steve Berg [EMAIL PROTECTED] wrote: Steve Berg [EMAIL PROTECTED] made an utterance to the drakelist gang--I have never had problems with de-oxit on switch wafers in my National, Clegg, Gonset and Hallicrafters equipment.I think I may have even usedit on my 2B at one point or another.For general cleaning purposes oneither electronics or my smoking pipes collection, I use ethanol.I buy the everclear variety from my local package goods store and use itsparingly with q-tips and pipe cleaners.I would steer clear of thede-natured stuff, especially if it contains methanol.It cleans wellwithout dissolving most things that I want to remain behind.For lubrication, I use Kroil or Break Free sparingly.If it requiresgrease, I use the synthetic gun grease that comes in a plungerapplicator.I think it is sold as shooter's choice.Steve WA9JML-- Submissions:drakelist@www.zerobeat.netUnsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of messageZerobeat Web Page:www.zerobeat.net - sponsored by www.tlchost.net--
