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21. [AMPS] AL82 vs AL1200 (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Sun, 11 Jul 1999 16:12:14 +0100; I friend of mine is getting ready to buy a legal limit amp for the radio club at work and has his eyes on the Ameritron AL82. Can anyone comment on the AL82 vs the AL1200. The amp will be used in a c; /archives//html/Amps/1999-07/msg00192.html (7,070 bytes)
22. [AMPS] Impedance of amplifiers (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Sun, 18 Jul 1999 02:03:54 +0100; Rich, et al: Not knowing anything about this, I would guess that a first approximation would be to take the output power of the amp in watts and then work backwards thru the pi network using simple l; /archives//html/Amps/1999-07/msg00344.html (11,025 bytes)
23. [AMPS] Good Meter vs CRT was Hot wire.... (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Wed, 28 Jul 1999 12:13:17 -0700; This brings up a question that I have. When the FCC inspects a station, how is the question of drive power handled? Many commercially available amplifiers will run more the 1500 watts output if they; /archives//html/Amps/1999-07/msg00576.html (10,766 bytes)
24. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Tue, 1 Jun 1999 20:40:01 -0700; Hi Tom, Thanks for your comments. After considerable rumination, I think I have reconciled your arguments and mine along with some previosuly fuzzy thinking on my part. Mixers are always non-linear d; /archives//html/Amps/1999-06/msg00021.html (14,095 bytes)
25. [AMPS] Vox efficient... (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Sun, 6 Jun 1999 21:29:14 -0700; Letting up on the PTT during the natural pauses in your speech is also very effective. Mike, W4EF................ ? Switching to the opposite sideband was also popular. Ten minutes later, the lock-to; /archives//html/Amps/1999-06/msg00183.html (9,412 bytes)
26. [AMPS] slam tally (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Wed, 9 Jun 1999 17:47:16 -0700; High level technical and managerial appointments are typically published in trade rags like Microwaves and RF magazine. If anyone knows about when Mr. Miklos was promoted (actually or allegedly) to t; /archives//html/Amps/1999-06/msg00318.html (11,807 bytes)
27. [AMPS] Arcing in air vs. arcing in a vacuum (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Mon, 17 May 1999 10:52:41 -0700; Jon, I think the phenomenon you are discussing is know as "multipaction". I am not familiar with the details of the physics, but suffice it to say that your friend is correct that ionization is more; /archives//html/Amps/1999-05/msg00192.html (10,827 bytes)
28. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Sat, 29 May 1999 21:29:28 -0700; Tom and Rich, This whole discussion makes no sense to me. If I put two sinewaves into any kind of nonlinear network, I would expect to see IMD products as well as harmonics results. After passing thr; /archives//html/Amps/1999-05/msg00343.html (12,177 bytes)
29. [AMPS] Resoldering 3-500Z Filament Pins ?? (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Thu, 1 Apr 1999 16:33:27 +0100; Mike, I am not sure about special techniques, but make sure you are very careful with the tube after you make the repair. Last time I tried fix a loose filament pin on a 3-500Z, I ended up watching i; /archives//html/Amps/1999-04/msg00015.html (9,714 bytes)
30. [AMPS] Re: Electrical discharge through the heart (was Resoldering3-500Z pins) (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Wed, 07 Apr 1999 14:53:23 +0100; John/Rich, et al: Maybe we can get one of the biomedical companies to form a joint venture with Alpha Power. Imagine the Alpha 87D (defib). In addition to performing the usual features such as grid t; /archives//html/Amps/1999-04/msg00137.html (14,263 bytes)
31. [AMPS] ARRL and QST (and CW Relevance) (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Mon, 1 Feb 1999 07:53:35 -0000; Jon, If you do a histogram of the "check" numbers in the Sweepstakes contest, you will see the that the numbers are solid up through the early 1980's, at which point the they start to decline. I susp; /archives//html/Amps/1999-02/msg00005.html (10,710 bytes)
32. [AMPS] MFJ-259 and matching circuits (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Wed, 3 Feb 1999 11:31:48 -0000; Rich and Jon, Would it not be possible to tune the circuit for min VSWR using the exciters VSWR meter, as Rich suggested (real world operating conditions), then turn off the amp, terminate its input; /archives//html/Amps/1999-02/msg00090.html (12,773 bytes)
33. [AMPS] MFJ-259 and matching circuits (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Fri, 5 Feb 1999 07:38:09 -0000; Hi Jon, The non-linear component of the tube's input impedance represents energy at harmonics of the drive signals fundamental or a DC term. If you consider that the resulting voltage and current wav; /archives//html/Amps/1999-02/msg00157.html (11,451 bytes)
34. [AMPS] TX Ant gain vs. RX Ant gain (was: Dollars per dB) (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Sat, 2 Jan 1999 05:52:34 -0000; Scott is correct only if the noise is coming from the same elevation angle as the desired signal. In this case, he would be correct. In reality though, more often than not, I suspect that there will; /archives//html/Amps/1999-01/msg00023.html (17,194 bytes)
35. [AMPS] Re: SERIOUS commentary from N4XY on "no-code" (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Thu, 28 Jan 1999 18:00:01 -0000; You also have to look at the Eb/No required to support a given bit density without error. Digital modulation techniques like QAM support many bits/hz (i.e. are very spectrally efficient), but require; /archives//html/Amps/1999-01/msg00536.html (10,291 bytes)
36. [AMPS] Re: Serious commentary from N4XY........................ (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Thu, 28 Jan 1999 18:09:59 -0000; In terms of effective data rates, it should be noted that maximum phone QSO rates in contests are typically only 2 to 3 times higher than CW rates ( a good phone op in the Carribean can do 300 - 400; /archives//html/Amps/1999-01/msg00540.html (7,604 bytes)
37. [AMPS] ARRL and QST (and CW Relevance) (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Fri, 29 Jan 1999 00:38:18 -0000; Yeah, but at what data rate? Uncoded BPSK bandwidth is usually about 1.4 times the data rate depending on the pulse shaping used in the modulator. 31 Hz would imply a data rate of around 22 bits/sec.; /archives//html/Amps/1999-01/msg00561.html (10,861 bytes)
38. [AMPS] Keying Alpha 78 w/Ten-Tec Paragon (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Mon, 7 Sep 1998 00:51:48 +-100; Was wondering what the proper configuration is for keying an Alpha 78A using a Ten-Tec Paragon 585. The 585 provides a open collector TX output pin which is recommended for keying the Titan Linear, b; /archives//html/Amps/1998-09/msg00082.html (7,910 bytes)
39. [AMPS] QRO Epoxy (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Thu, 17 Sep 1998 04:49:30 +-100; Does anyone know of an epoxy that is good in shear strength and compatible with high power RF (high dielectric strength and low dielectric constant)? I am trying to repair a Diawa CS-201 RF switch wh; /archives//html/Amps/1998-09/msg00205.html (7,082 bytes)
40. [AMPS] RF Epoxy for Antenna Switch (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Sun, 20 Sep 1998 05:08:45 +-100; I am looking for an epoxy suitable for use in a high power RF switch application. I need to keep the center conductor of an SO-239 from rotating. Does JB Weld have suitable properties as an RF dielec; /archives//html/Amps/1998-09/msg00211.html (7,008 bytes)

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