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1. [AMPS] "PARASITES IN TRANSMITTERS" by G. W. Fyler (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 7 Mar 2000 11:31:19 -0700; - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Proble; /archives//html/Amps/2000-03/msg00404.html (7,047 bytes)
2. [AMPS] Need Heathkit SB200 schematic (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 2 Feb 2000 02:59:45 -0700; I would convert the sb200 from negative polarity RL control to positive. Basically, this envolves getting rid of the inane biasing sheme and converting to something like the sb-220 configuration, wi; /archives//html/Amps/2000-02/msg00007.html (7,524 bytes)
3. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 2 Feb 2000 19:38:42 -0700; Did you see the precaution against using so-called equalizer resistors in the post 1994 Handbooks? What value of R ans watt rating?. thanks Did you have a glitch resistor in series with the positive; /archives//html/Amps/2000-02/msg00011.html (11,065 bytes)
4. [AMPS] Doorknob Capacitors (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 05:10:25 -0700; When you have the two blocking capacitors paralleled with copper straps, it might be fun to see what the self-resonant frequency is. My unsolicited advise is that paralling two blocking capacitors c; /archives//html/Amps/2000-02/msg00025.html (7,188 bytes)
5. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 05:10:27 -0700; The author provides a semi-explanation of the failure mechanism with equalizers. . We have the knowledge that currents are always equal in a series circuit. ? Doctors used to recommend eating marger; /archives//html/Amps/2000-02/msg00026.html (13,317 bytes)
6. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 05:10:29 -0700; 200 amperes cheers, Peter - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUES; /archives//html/Amps/2000-02/msg00027.html (9,995 bytes)
7. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 07:50:01 -0700; The 60Hz repetitive pk rating is 200a for 1n5408s. . The 6A version is rated at 400 repetitive amps. cheers, Peter. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contest; /archives//html/Amps/2000-02/msg00037.html (9,338 bytes)
8. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 07:50:04 -0700; As I understand it, a rating of say 8.3mS indicates the period of the allowable repetitive peak. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/amps; /archives//html/Amps/2000-02/msg00038.html (9,596 bytes)
9. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 07:50:08 -0700; What is the repetitive peak I rating? thanks - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative re; /archives//html/Amps/2000-02/msg00039.html (9,163 bytes)
10. [AMPS] alpha (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 07:50:09 -0700; ? Depends on the band. On 160m, The stock Tune-C does not have nearly enough C for two tubes and a Q of 10. . Also bypass-type doorknob caps were used for 160m tuned circuit padders. Also, the L tap; /archives//html/Amps/2000-02/msg00040.html (7,542 bytes)
11. [AMPS] Irep ofPower Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 09:51:38 -0700; Don't most rectifiers conduct in half-cycles? So, once the rated one-time one-cycle surge of 200a has been used up, any current greater than 3A could be expected to cause immediate diode failure? ch; /archives//html/Amps/2000-02/msg00049.html (8,133 bytes)
12. [AMPS] Irep- Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 09:51:41 -0700; 1A, 3A, on and on is the "Average Current" rating on the diode spec sheets in the Digi-Key catalogue. 200A is the "Peak Forward Surge Current" rating for the 3A avg. current units. . There is no sta; /archives//html/Amps/2000-02/msg00050.html (7,308 bytes)
13. [AMPS] Power Supply Diodes (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 3 Feb 2000 19:01:53 -0700; beats me. sgreed cheers - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@; /archives//html/Amps/2000-02/msg00064.html (8,884 bytes)
14. [AMPS] Nichrome/Parasitics/ARRL Handbook 2000 (score: 1): Author: measures@vcnet.com (measures); Date: Mon, 7 Feb 2000 11:58:28 -0700; Craig -- This was written by Dick Erhorn / W4ETO for the 1995 Handbook, several years before N7WS/Wes' measurements of copper-wire vs resistance-wire suppressors. . My guess is that Dick never read; /archives//html/Amps/2000-02/msg00093.html (9,430 bytes)
15. SV: [AMPS] Nichrome/Parasitics/ARRL Handbook 2000 (score: 1): Author: measures@vcnet.com (measures); Date: Mon, 7 Feb 2000 14:55:56 -0700; My guess is probably not better VHF stability. The mla-2500 has several hundred nH between the anodes and C1. However, on avg. they have plenty of parasites. The problem it that the extra long anode; /archives//html/Amps/2000-02/msg00099.html (12,715 bytes)
16. [AMPS] knwd 922 (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 8 Feb 2000 06:54:29 -0700; ? The Zener in the 922 is seemingly extraordinarily tough. An extraordinary current pulse is required to cause it to short. A shorted Zener is an indicator or intermittent parasitic oscillation at c; /archives//html/Amps/2000-02/msg00119.html (7,345 bytes)
17. [AMPS] AL-1200, AL-1500, OR? (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 8 Feb 2000 06:54:27 -0700; ? Here's one. The AL-1500 in the only 8877 amplifier on Earth that has No VHF parasitic suppressor. A friend who has a computer program that analyzes amplifier stability, told me that the 8877 has e; /archives//html/Amps/2000-02/msg00120.html (7,751 bytes)
18. [AMPS] Fil voltage al-1200 (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 8 Feb 2000 07:52:26 -0700; The critical thing is filament v at the filament pins. For max. tube life, the low end of the rated v range is best. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contes; /archives//html/Amps/2000-02/msg00123.html (8,096 bytes)
19. SV: [AMPS] Nichrome/Parasitics/ARRL Handbook 2000 (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 8 Feb 2000 11:04:07 -0700; impedance beetween The fly in the ointment is that the significant inductor can act as a 1/4 wave line as well as a 3/4 (or 5/4) wave line. If the 1/4 wave resonance is below the grid-resonance, osc; /archives//html/Amps/2000-02/msg00130.html (9,758 bytes)
20. [AMPS] Fil voltage al-1200 (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 8 Feb 2000 11:04:10 -0700; the resistor cold true -- but a cold heater does not. See below but Eimac does not say anything about limiting the startup current to the 8877 heater. While it is true that directly-heated cathode t; /archives//html/Amps/2000-02/msg00131.html (9,045 bytes)

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