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1. [AMPS] Power Supply Diodes (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Thu, 03 Feb 2000 14:24:29 +0000; The Motorola web data sheet shows 200 amperes for NON-repetitive peak current for the 1N5408; the 1N4007 is rated at 30 amperes. Neither data sheet gives a repetitive peak current rating. 73, Steve K; /archives//html/Amps/2000-02/msg00035.html (9,167 bytes)
2. [AMPS] Power Supply Diodes (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Thu, 03 Feb 2000 14:40:50 +0000; I gather that Larry has apparently not replaced the rectifiers as yet and operated the unit again. So perhaps something DID blow, taking out the diodes, which he will discover when he tries to fire i; /archives//html/Amps/2000-02/msg00036.html (10,853 bytes)
3. [AMPS] Power Supply Diodes (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Thu, 03 Feb 2000 18:38:49 +0000; Pardon me: here's the exact wording from the Motorola 1N5408 data sheet, both the present-day web page and from my old "Motorola Silicon Rectifier Manual", Series A, copyright 1980: "Average Rectifie; /archives//html/Amps/2000-02/msg00052.html (10,721 bytes)
4. [AMPS] Irep ofPower Supply Diodes (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Thu, 03 Feb 2000 18:34:02 +0000; The nonrepetitive peak surge current rating, I(FSM), is defined in the Motorola "Silicon Rectifier Manual" as: "A final temperature limit is the peak surge junction temperature, T(JSM). If the surge; /archives//html/Amps/2000-02/msg00053.html (9,962 bytes)
5. [AMPS] Ameritron ALS600 (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Mon, 14 Feb 2000 04:51:04 +0000; Someone please confirm that the TS450SAT is, indeed, capable of this problem?? This is the first time I can remember hearing of it in the 450. The FT100 and 847 are well-known for the spike as are a; /archives//html/Amps/2000-02/msg00229.html (7,571 bytes)
6. [AMPS] IMD Question (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Mon, 14 Feb 2000 19:07:30 +0000; It is not commonly realized that "soft" compression is due to harmonic energy. Power meters cannot differentiate between the fundamental and harmonic power so the harmonic energy contributes to the t; /archives//html/Amps/2000-02/msg00238.html (12,199 bytes)
7. [AMPS] IMD Question (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Mon, 14 Feb 2000 21:24:58 +0000; As the proper grid bias value shifts more negative with grid current, the plate current rate of change with drive power becomes less linear; this can be easily seen using the tube characteristics cur; /archives//html/Amps/2000-02/msg00243.html (11,200 bytes)
8. [AMPS] IMD Question (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Mon, 14 Feb 2000 22:18:05 +0000; Easy enough to do when the filter is included within the system when "calibrating" the receiver or spectrum analyzer with the known-clean signal. This is, in fact, the ONLY correct method of "calibra; /archives//html/Amps/2000-02/msg00244.html (10,447 bytes)
9. [AMPS] IMD Question (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Tue, 15 Feb 2000 13:23:36 +0000; You have to be very careful when using any kind of broadband sweep generator to measure gain compression, as many of the older ones do not have good harmonic suppression. Some later models utilize PI; /archives//html/Amps/2000-02/msg00253.html (10,911 bytes)
10. [AMPS] interesting SS amps (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Tue, 15 Feb 2000 22:19:54 +0000; For lots of RF power, perhaps. But how many pico-sized 8973s could you fit into a package the size of a Pentium? Guess we'll never know ;o)))) 73, Steve K0XP -- FAQ on WWW: http://www.contesting.com/; /archives//html/Amps/2000-02/msg00266.html (8,306 bytes)
11. [AMPS] ? about tuned input, sorry.... (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Sat, 19 Feb 2000 19:57:03 +0000; An input circuit for any single band shouldn't be the least bit difficult to match to the tubes. I'd sure look into the existing input circuit as it's not at all right with that kind of high VSWR. Pu; /archives//html/Amps/2000-02/msg00379.html (9,003 bytes)
12. [AMPS] WTB: Big Blower (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Thu, 13 Jan 2000 00:48:00 +0000; Needed: large blower. Ideal candidate will possess the following qualifications: Qualifications: 55 CFM at 1 inch backpressure, 80 CFM at 1.5 inch backpressure. At 3000 RPM, this will require an air; /archives//html/Amps/2000-01/msg00242.html (7,052 bytes)
13. [AMPS] Re: RF choke forms (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Sun, 16 Jan 2000 00:31:39 +0000; 3 kV DC across the plate choke? I think you'll have other, more expensive worries before that became a problem. Consider the peak anode RF voltage, particularly at odd-order harmonic frequencies. Alt; /archives//html/Amps/2000-01/msg00343.html (9,134 bytes)
14. [AMPS] your sb-220 mod (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Wed, 19 Jan 2000 14:30:59 +0000; You've mentioned that you've bypassed the new input relay; but how about the new output relay? Bypass that, then bypass the new input relay, too, if the problem persists. Entirely possible but any ex; /archives//html/Amps/2000-01/msg00421.html (8,013 bytes)
15. R: [AMPS] broadband L at output (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Fri, 21 Jan 2000 02:02:00 +0000; There are plenty of examples of 4:1 toroidal transformers used at the multi-KW range, usually to step back up to 200 ohms (or even higher). Proper core design and choice is necessary, of course, but; /archives//html/Amps/2000-01/msg00446.html (8,871 bytes)
16. [AMPS] Input power question (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Tue, 25 Jan 2000 21:39:52 +0000; Only the former. If the cable is matched to the load (amplifier input impedance), the impedance at the radio-end of the cable won't change due to cable length, and it doesn't matter what impedance th; /archives//html/Amps/2000-01/msg00522.html (11,458 bytes)
17. [AMPS] failures (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Sat, 08 Nov 1997 14:11:05 +0000; [snip] Frankly, I could care less whose THEORY is right so long as somebody has a CURE for the problems which the contrasting theories attempt to explain. Mr. Measures' "cures" work; nobody else has; /archives//html/Amps/1997-11/msg00099.html (7,928 bytes)
18. [AMPS] SB 220 vice SB221 (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Sun, 23 Nov 1997 20:31:31 +0000; That's strange; every time I've had an amp do the "arcing" and "spitting" thing, it was when either/or both the plate and loading caps were at or near minimum; and almost always when the bandswitch w; /archives//html/Amps/1997-11/msg00328.html (14,124 bytes)
19. [AMPS] SB 220 vice SB221 (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Mon, 24 Nov 1997 01:53:16 +0000; Carl, I believe that you are talking about a totally different failure mechanism, that caused by an incorrect load, and which is something that occurs over some finite, measurable period of time, som; /archives//html/Amps/1997-11/msg00334.html (14,819 bytes)
20. [AMPS] Re: Resistor in B+ lead (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Sun, 12 Oct 1997 23:18:06 +0100; Welcome: you have now been initiated, and only have years and years of loud BANGS to look forward to (in between reports of "loudest signal on the band", of course...). When you've burned up your fir; /archives//html/Amps/1997-10/msg00073.html (10,613 bytes)

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