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141. Re: [Amps] HARRIS PP-7913/URC POWER SUPPLY (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Thu, 5 Jan 2017 16:48:22 -0500
I noticed that this power supply uses a choke in the B negative lead. The B negative is grounded directly to the chassis. Most schematics for GG show the B negative lifted above ground a little for
/archives//html/Amps/2017-01/msg00109.html (8,147 bytes)

142. Re: [Amps] 4 wire EBM Papst fan but without using PWM (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sat, 7 Jan 2017 19:20:21 -0500
I have a couple of EBM-PABST 3254J/2H3P fans which have a 4 wire interface. I do not want to use PWM and while they run with just the positive and negative DC voltage applied they tend to change spe
/archives//html/Amps/2017-01/msg00157.html (8,726 bytes)

143. Re: [Amps] Diagnosing relay problem (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 8 Jan 2017 09:00:15 -0500
I have recently been suffering from intermittent attenuation of RX signals through my amplifier, which has a vacuum relay (Jennings RJ1-A) in the output and a HG d'Italia relay from max gain (see he
/archives//html/Amps/2017-01/msg00172.html (8,339 bytes)

144. Re: [Amps] 4 wire EBM Papst fan but without using PWM (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 8 Jan 2017 09:35:20 -0500
That does not answer my question, it shows a link to a lot of ways of how to implement PWM. I do not wish to have any potentially noisy PWM circuits I just want to know what to do with the PWM and t
/archives//html/Amps/2017-01/msg00174.html (10,283 bytes)

145. Re: [Amps] OK, here's a home brewing question. I JUST DON'T GET IT! (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Fri, 13 Jan 2017 10:31:42 -0500
On 01/13/2017 07:54 AM, Chris Wilson wrote in part: /* snip */ I am running it off a pair of big HP SMPS computer server supplies. 52V each, at many Amps. In series for full power, singly for low pow
/archives//html/Amps/2017-01/msg00258.html (9,275 bytes)

146. Re: [Amps] Amps Digest, Vol 170, Issue 4 (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 7 Feb 2017 08:30:40 -0500
Is this post from a ham? I don't see a call anywhere. Not in the spirit of the ham radio that I grew up with and still try to practice. /* snip */ There are a lot of misconceptions in the two HAM ra
/archives//html/Amps/2017-02/msg00017.html (8,052 bytes)

147. Re: [Amps] Checking Filament Voltage (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 21 Feb 2017 12:29:06 -0500
the variac to bring the fil V up slowly each time. If the variac was pre-set to correct fil V, then a simple toggle used to switch on, dunno if the small variac would have enough Z to limit fil inru
/archives//html/Amps/2017-02/msg00162.html (8,585 bytes)

148. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 21 Feb 2017 23:06:24 -0500
water..... without having to go through the boiling process. De-ionized water IS NOT pure water, the de-ionizing process does NOT remove silicates that are abundant is some parts of the world, very
/archives//html/Amps/2017-02/msg00175.html (9,127 bytes)

149. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 5 Mar 2017 15:37:00 -0500
Distilled water is de ionized - it is one of the ways de ionized water is produced. All else being equal, deionized water can be cheaper to produce. It takes less energy to remove the ions from an a
/archives//html/Amps/2017-03/msg00035.html (9,181 bytes)

150. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Mon, 6 Mar 2017 16:03:55 -0500
On 03/06/2017 03:52 PM,Joe WB9SBD asked: but, all these alternate to water and or water blends, how are they electrically? still an insulator? Positively NOT, they are highly conductive. These tubes
/archives//html/Amps/2017-03/msg00058.html (9,568 bytes)

151. Re: [Amps] Labeling house circuits (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 21 Mar 2017 11:58:39 -0400
Label the wall outlet with the actual circuit breaker rating. Good advice. How have other hams done the labeling? I don't want a sloppy masking tape label, but something permanent and good-looking.
/archives//html/Amps/2017-03/msg00130.html (8,849 bytes)

152. Re: [Amps] Labeling house circuits (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 21 Mar 2017 21:22:30 -0400
I use a Brother P-Touch that I bought at Goodwill for $20 you can get them (computer driven) for $47 from amazon.com. Common cartridges are available in black on white or colors or black or white on
/archives//html/Amps/2017-03/msg00139.html (9,290 bytes)

153. Re: [Amps] KAPUT 8877'S -DISPOSAL (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Wed, 22 Mar 2017 12:52:35 -0400
I have (6) 8877s that are no good (kaput). Reading through the archives there does not appear to be any viable options for rebuilding. So.. The $64 question... what is the responsible way to dispose
/archives//html/Amps/2017-03/msg00146.html (9,073 bytes)

154. Re: [Amps] 3 phase power supply? (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 2 Apr 2017 21:56:06 -0400
/* snip */ But, another thing to consider. I was looking a the schematic and saw where some of the smaller transformers were fed from one phase, while the HV was fed by two phases. Again, from what I
/archives//html/Amps/2017-04/msg00008.html (8,545 bytes)

155. Re: [Amps] Mobile Amps ? (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sat, 15 Apr 2017 10:24:32 -0400
I remember years ago when computerized engine management was being bothered or destroyed by ham, public safety, and commercial radios. A big stink resulted, plus law suits until it was corrected It
/archives//html/Amps/2017-04/msg00110.html (9,287 bytes)

156. Re: [Amps] Mobile Amps ? (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sat, 15 Apr 2017 12:58:27 -0400
I am thinking of upgrading my mobile station from 100w to something more. 500-600w minimum. At one time there seemed to be more choices available to the mobile ham but now about the only choice seem
/archives//html/Amps/2017-04/msg00114.html (10,463 bytes)

157. Re: [Amps] Mobile Amps ? (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sat, 15 Apr 2017 13:52:18 -0400
I would love to have some kind of QRO to knock off those idiots that insist on using their cell phones while driving! I wouldnt mind to have something that would blast the heck of those kids that us
/archives//html/Amps/2017-04/msg00117.html (9,038 bytes)

158. Re: [Amps] RF in Vehicles (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Thu, 20 Apr 2017 21:54:58 -0400
Mark Bitterlich wrote: /* snip */ When the transmitter is turned on, one of the internal generators in the aircraft immediately turns off. The generator is a 3 phase 115 VAC 400 Hz model that uses an
/archives//html/Amps/2017-04/msg00143.html (8,632 bytes)

159. Re: [Amps] tarnish or corrosion? (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 23 Apr 2017 09:49:19 -0400
Have you ever thought of putting petroleum jelly on the contacts to prevent the moist air from getting to the metal? Worth a try! Better, use something made for this exact problem: https://smile.amaz
/archives//html/Amps/2017-04/msg00213.html (8,721 bytes)

160. Re: [Amps] 144 MHz GS35B update (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 2 May 2017 07:20:14 -0400
Efficiency seems to be better with lower voltage but more drive. http://www.qsl.net/dl4mea/2GS35B_de_en.pdf In that example of a W6PO design efficiency is: 43% with 20W drive at 2,8KV, output 450W 7
/archives//html/Amps/2017-05/msg00034.html (9,942 bytes)

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