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21. [Amps] AL811H (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 18 May 2002 14:57:39 -0700; Scott, Its sounds like one of your new tubes is gassy giving rise to leakage current from plate to grid. Try rotating out the new tubes one at a time until you find the culprit. Good luck! 73 de Mike; /archives//html/Amps/2002-05/msg00299.html (7,682 bytes)
22. [Amps] AL811H (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 18 May 2002 13:14:43 -0700; Scott, Its sounds like one of your new tubes is gassy giving rise to leakage current from plate to grid. Try pulling out the new tubes one at a time until you find the culprit. Good luck! 73 de Mike,; /archives//html/Amps/2002-05/msg00300.html (7,641 bytes)
23. [Amps] Subharmonic (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Tue, 21 May 2002 22:10:27 -0700; Tom, Yes, it would seem a bit improbable for a system like this to just happen by accident, although as the IEEE paper points out, it is theoretically possible, which was, in and of itself, news to m; /archives//html/Amps/2002-05/msg00348.html (9,980 bytes)
24. [Amps] Subharmonic (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 22 May 2002 07:27:27 -0700; Hi Tom, Yes, but if even if the spurious signal is coming from an unintentional oscillator, it appears to be phase-locked (at least crudely) to the 14 MHz fundamental. This implies that the unintenti; /archives//html/Amps/2002-05/msg00352.html (9,717 bytes)
25. [Amps] RE: [Amps] Subharmonic (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 23 May 2002 07:43:57 -0700; Mauri, The top trace shows periodicity at a 6.5 MHz rate. Since the signal has a Fourier component at this frequency, if I pass it through a low-pass filter with a cutoff at say 7 MHz, I should get a; /archives//html/Amps/2002-05/msg00379.html (8,264 bytes)
26. [Amps] Emission Standards Regarding SSB & AM Bandwidth (score: 1): Author: W4EF@dellroy.com (Mike); Date: Mon, 1 Apr 2002 18:52:35 -0800; Sounds like the 3KHz its not stated explicitly in rules, but rather implied in the following: occupy more bandwidth than necessary for the information rate and emission type being transmitted, in acc; /archives//html/Amps/2002-04/msg00042.html (10,277 bytes)
27. [Amps] IMD vs. Vcc (score: 1): Author: W4EF@dellroy.com (Mike); Date: Mon, 1 Apr 2002 22:01:52 -0800; Guess that means I can't build that 10KHz wide HI-FI SSB rig after all - eh? Mike, W4EF.............; /archives//html/Amps/2002-04/msg00056.html (9,412 bytes)
28. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Re: [Amps ] Bird® 43 Ma nua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 4 Apr 2002 15:08:12 -0800; Gary, I think what Tom was suggesting is that the meter can still be used to reliably determine power delivered to the load even with large impedance mismatches. Also, it would appear that the reflec; /archives//html/Amps/2002-04/msg00166.html (13,919 bytes)
29. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Re: [Amps ] Re: [Amps ] Bird® 43 Ma nua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Mon, 8 Apr 2002 16:14:39 -0700; that Huh, 1000 ohms is a bad mismatch against a 50 ohm characteristic impedance, whether its purely reactive, purely resistive, or some combination of the two. I would expect the second meter to indi; /archives//html/Amps/2002-04/msg00249.html (12,774 bytes)
30. [Amps] re:- Heath Kit SB220 Linear Amp - Unbuilt (score: 1): Author: W4EF@dellroy.com (Mike); Date: Wed, 10 Apr 2002 10:46:49 -0700; I wonder if the tubes are gassy after all these years? Mike, W4EF............... kit problem." --; /archives//html/Amps/2002-04/msg00289.html (11,274 bytes)
31. [Amps] CBers (score: 1): Author: W4EF@dellroy.com (Mike); Date: Wed, 10 Apr 2002 20:34:21 -0700; I ran into a young guy at the Pomona swap meet last month who was looking for amplifier parts. He bought some Motorola sytle power combiners from one guy who had a bunch of healthy looking amplifier; /archives//html/Amps/2002-04/msg00302.html (9,065 bytes)
32. [Amps] 811/572 triodes (score: 1): Author: W4EF@dellroy.com (Mike); Date: Fri, 26 Apr 2002 11:03:29 -0700; Yep, two 572's in a Heathkit SB-200 will deliver about the same output power (600 - 800 watts) as four 811's in a Collins 30L1. Mike, W4EF.............. to started and possible; /archives//html/Amps/2002-04/msg00566.html (8,284 bytes)
33. [Amps] SB-220 Manual (score: 1): Author: W4EF@dellroy.com (Mike); Date: Tue, 30 Apr 2002 10:18:50 -0700; I have a friend who just picked up a Heathkit SB-220 that is missing the owners manual. Does anyone have a scanned version that I can download, or know of someplace where I can pick-up a copy. Thanks; /archives//html/Amps/2002-04/msg00601.html (6,412 bytes)
34. [Amps] al-1200 question (score: 1): Author: W4EF@dellroy.com (Mike); Date: Fri, 8 Mar 2002 01:41:27 -0800; I don't see how turning on an amp for a few hours every now and then to help break a pileup will "run up your electric bill". The duty cycle for a good CW operator in a DX pileup is low enough (most; /archives//html/Amps/2002-03/msg00152.html (11,005 bytes)
35. [Amps] AL-1200 Question (score: 1): Author: W4EF@dellroy.com (Mike); Date: Fri, 8 Mar 2002 07:46:50 -0800; You are assuming that the individual in question does not have enough will power to keep it legal. I have done exactly what he described on numerous occasions without ever having to switch my Drake W; /archives//html/Amps/2002-03/msg00162.html (10,280 bytes)
36. [Amps] al-1200 question (score: 1): Author: W4EF@dellroy.com (Mike); Date: Fri, 8 Mar 2002 09:59:12 -0800; The phase coherence of the signal versus the noise has nothing to do with it. Both are signals. If they are both coming from the same direction, then the increased antenna gain won't improve receiver; /archives//html/Amps/2002-03/msg00178.html (11,585 bytes)
37. [Amps] TenTec Titan 425 (score: 1): Author: W4EF@dellroy.com (Mike); Date: Mon, 11 Mar 2002 07:01:23 -0800; Dude, gold is a good conductor. The reason it is a good conductor is that there is a single electron in the outer shell which is relatively free to move about under the influence of an electric field; /archives//html/Amps/2002-03/msg00233.html (9,104 bytes)
38. [Amps] 10 Meters (score: 1): Author: W4EF@dellroy.com (Mike); Date: Tue, 12 Mar 2002 12:54:26 -0800; Hi John, I operated the contest two weekends ago. I had a two radio setup so I actually listened to my own signal a few times. I was concerned because my monitor output sounded kind of crappy on 10 m; /archives//html/Amps/2002-03/msg00259.html (10,166 bytes)
39. [Amps] 10 Meters (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 14 Mar 2002 04:39:47 -0800; Hi Steve, The problem with the monitor circuit is that even when its done at RF, its usually done in one of the low level IF stage. This lets you hear what the speech processing sounds like, but does; /archives//html/Amps/2002-03/msg00289.html (15,146 bytes)
40. [Amps] Useful parts (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 14 Mar 2002 06:44:23 -0800; There was an article in RF Design Magazine in the early 90's where some guy turned a microwave oven into a 2.4 GHz ATV transmitter. Don't recall the specifics, but I thought the idea was kind of nove; /archives//html/Amps/2002-03/msg00297.html (8,096 bytes)

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