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121. [Amps] P600M diodes in HT supplies (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 30 Apr 2002 21:23:36 -0700; ? Put "equalizer" resistors/capacitors on a string of same-type Si rectifiers and one increases the chance of failure. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. en; /archives//html/Amps/2002-05/msg00001.html (7,858 bytes)
122. [Amps] P600M diodes in HT supplies (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 30 Apr 2002 23:11:30 -0700; ? Because diodes ordinarily have differing Peak Inverse Voltages, if the equalizer resistors try to force the same V across each diode, the lowest PIV diode can be subjected to more PIV than it can; /archives//html/Amps/2002-05/msg00004.html (10,516 bytes)
123. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 5 May 2002 10:01:10 -0700; True enough. except UHF ? It can't, Eric. Good logic, methinks. However, with half-wave rectification, only the forward transient is stored in the filter capacitor, so shunt capacitors across the di; /archives//html/Amps/2002-05/msg00032.html (10,051 bytes)
124. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 5 May 2002 11:58:39 -0700; ? For full-wave rectifier, choke-filter supplies, and all half-wave rectifier supplies, yes. Capacitor-filter supplies and resonant-choke/C filter supplies have built-in spike suppression, so a MOV; /archives//html/Amps/2002-05/msg00034.html (8,798 bytes)
125. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 5 May 2002 13:00:04 -0700; ? Only with no load on the transformer. "Why"? - - With a full-wave rectifier and filter C there is a low-ESR load - as he explained. ? Only if the filter-C is removed. ? Ian -- Do those whom you ca; /archives//html/Amps/2002-05/msg00036.html (13,388 bytes)
126. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 5 May 2002 13:08:58 -0700; The waveshapes on the primary and the secondary a transformer are virtually identical. Suppress transients on one, and the job is done. cheers, Paul - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG; /archives//html/Amps/2002-05/msg00037.html (10,884 bytes)
127. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 5 May 2002 17:16:59 -0700; If the secondary is loaded by the filter-C, no problema. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00041.html (8,074 bytes)
128. [Amps] Transformer rewinding (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 6 May 2002 05:33:58 -0700; ? A resonant-choke filter should be ok with a 106-ohm secondary - and it would reduce the V to something that could be used with an 8877 on SSB. However, a 30A/120V service outlet would be needed. -; /archives//html/Amps/2002-05/msg00047.html (7,496 bytes)
129. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 6 May 2002 14:25:24 -0700; K., of on Incoming spikes get rectified and stored in the filter-C. ? no - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00054.html (12,358 bytes)
130. [Amps] Transformer secondary resistance (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 7 May 2002 04:38:54 -0700; ? 106-ohms is decent for some finite load R, depending on the rectification circuit used. - For FWD service, using a C-filter, multiply the secondary R by a constant of c. 300 to arrive at the usuab; /archives//html/Amps/2002-05/msg00066.html (8,888 bytes)
131. [Amps] Transformer secondary resistance (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 7 May 2002 04:39:00 -0700; No, it's good engineering practice, Steve. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00067.html (8,826 bytes)
132. [Amps] Rectifier diode strings (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 7 May 2002 07:10:55 -0700; ? congrats, Jeff. saturating apply is - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00070.html (10,964 bytes)
133. [Amps] Adding 10 meters to a SB-221? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 8 May 2002 04:56:37 -0700; 1. remove CB filter. 2. add 10m contacts to bandswitches with #0-80 nuts/screws. 3. rework all tuned input circuits for a Q of 2 -3, and add a 10m tuned input. 4. add 10m tap on tank L. On 10m, ther; /archives//html/Amps/2002-05/msg00078.html (7,284 bytes)
134. [Amps] Copper Pi tank coil oxidisation (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 8 May 2002 08:38:04 -0700; ? not much but to prevent Cu O from forming, polish the tubing with fine steel wool and coat with gloss urethane varnish. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures.; /archives//html/Amps/2002-05/msg00089.html (8,154 bytes)
135. [Amps] Adding 10 meters to a SB-221? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 8 May 2002 08:49:48 -0700; The padding C is for 80m-loading. The tune C on my SB221 was identical to that in my SB-220. Putting a SB-221 on 27MHz involves wiring around the CB filter; moving the 15m tap on the tank L; and ins; /archives//html/Amps/2002-05/msg00090.html (9,770 bytes)
136. [Amps] Copper Pi tank coil oxidisation (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 8 May 2002 08:52:48 -0700; There are Hams who build fashion-amplifiers to impress their friends. cheers, Peter - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00091.html (7,433 bytes)
137. [Amps] RJ-1A and HC-1 high-speed vacuum relay source (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 8 May 2002 11:25:18 -0700; Fair Radio Sales is reportedly out of these relays. Another source is http://www.mgs4u.com/relay.htm The price is $32.50. In the speedup circuit shown in Figure 7 on my Web site, either the Jennings; /archives//html/Amps/2002-05/msg00095.html (6,589 bytes)
138. [Amps] Interaction, antennas. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 12 May 2002 10:07:34 -0700; Discussing antennas on Towertalk is difficult because of censorship from the moderator. cheers, Cleeve - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00138.html (6,784 bytes)
139. [Amps] SB220 TUNE VARIABLE (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 12 May 2002 10:10:07 -0700; Why do you need to replace the Tune-C, Fabio? ciao - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00139.html (6,538 bytes)
140. [Amps] Transformer Question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 12 May 2002 16:08:05 -0700; Does anyone have any info on amorphous core transformers? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00144.html (6,570 bytes)

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