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121. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 2 Dec 2001 18:44:12 -0500; Not true. It sounds "nice", but it is not factual. In truth, the impedance barely changes. Let's assume the blocking cap, at the lowest frequency, would be set a reasonable value of 10% of the imped; /archives//html/Amps/2001-12/msg00009.html (9,751 bytes)
122. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 3 Dec 2001 05:50:38 -0500; That would be true only if you broke the "rule" that the blocking cap reactance has to be small compared to the plate impedance of the tube. That would happen if the tube had low reactance in parall; /archives//html/Amps/2001-12/msg00014.html (8,581 bytes)
123. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 3 Dec 2001 15:17:53 -0500; My point, which is sometime lost when threads are so long, is that the rule of thumb of using a blocking cap 25% of the reactance of the tuning cap is not a good rule of thumb. The blocking cap react; /archives//html/Amps/2001-12/msg00034.html (12,302 bytes)
124. [AMPS] AL1500 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 5 Dec 2001 07:39:45 -0500; Ohh, this parasitic nonsense again? 8877's have had poor service history while they were at Salt Lake. While there were periods of time in the 80's when you couldn't get a tube that lasted over a few; /archives//html/Amps/2001-12/msg00097.html (9,917 bytes)
125. [AMPS] Re: 6m amp blocking caps (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 5 Dec 2001 09:45:21 -0500; I see the same old "grid dip meter tells all" argument is going on! Good luck Ian! Actually you can't tell a thing about whether it is a "good desirable dip" , something meaningless, or a potential; /archives//html/Amps/2001-12/msg00106.html (9,613 bytes)
126. [AMPS] AL1500 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 5 Dec 2001 09:45:21 -0500; I'm speaking from the standpoint of service history of components. When you get a good semiconductor, which is nearly 100% of the time, you can expect it to last dozens of years. You can turn it off; /archives//html/Amps/2001-12/msg00107.html (9,940 bytes)
127. [AMPS] AL1500 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 6 Dec 2001 19:07:20 -0500; Now, to Rich's point (I believe)...the fuse may in fact blow faster in Fuses are notoriously unreliable, if you doubt that test some...or look at references. Unreliability is the whole problem with f; /archives//html/Amps/2001-12/msg00151.html (10,587 bytes)
128. [AMPS] AL1500 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 9 Dec 2001 22:00:32 -0500; Rich Measures suggests (or has suggested) using resistors to replace electronic systems, rather than using fuses. Fuses are bad enough. I can't imagine anyone depending on a conventional resistor to; /archives//html/Amps/2001-12/msg00179.html (8,882 bytes)
129. [AMPS] Stupid transformer question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 16 Dec 2001 00:37:57 -0500; Woah there! Don't do that! Most efficient transformers are designed to run with the core near saturation. Very few would have safety factor of 2x. Primary current will go sky-high if the core satura; /archives//html/Amps/2001-12/msg00256.html (9,888 bytes)
130. [AMPS] Two-tone audio generator for testing IMD? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 16 Dec 2001 19:33:03 -0500; You can not, unless you have an exceptional exciter, dump two audio tones in the audio and measure the amplifier. If your exciter is 60 or more dB down for all IMD and spurious on two-tone tests, the; /archives//html/Amps/2001-12/msg00269.html (8,581 bytes)
131. [AMPS] Two-tone audio generator for testing IMD? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 17 Dec 2001 08:32:47 -0500; Distortion is phase coherent. Because of phase and level differences through a system where each stage adds distortion, distortion can add, subtract or do anything in between. Measuring white noise; /archives//html/Amps/2001-12/msg00283.html (10,860 bytes)
132. [AMPS] Inductors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 18 Dec 2001 11:38:44 -0500; Absolutely! If you don't slot the length of the metal tube near the active area of the coil there is a "shorted turn effect" that reduces Q and increases circulating currents. There is also a Q redu; /archives//html/Amps/2001-12/msg00329.html (7,783 bytes)
133. [AMPS] Relays (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Dec 2001 09:36:38 -0500; Hi Dick, I didn't have a chance to answer the original question, but let me give a general reply about relays...since it will apply to ANY amplifier and ANY antenna switch and be useful to anyone de; /archives//html/Amps/2001-12/msg00435.html (10,096 bytes)
134. [AMPS] M/A Com fets ++ (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Dec 2001 21:02:04 -0500; He posted this way back in mid year 2000: Alexander Sandbrand N2NUU sandlabs@yahoo.com When I did a QRZ seach, the call he used came up this way: Callsign:N2NUU Class: Tech Plus Codes: HAI USA Name:; /archives//html/Amps/2001-12/msg00455.html (8,149 bytes)
135. [AMPS] M/A Com fets ++ (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Dec 2001 21:22:00 -0500; Some additional information from the Web: Enclosure: 2 pages. August 17, 2001. Mr. Alexander Sandbrand 39 Hughes Terrace Yonkers, NY 10701. Subject: Technician Amateur License N2NNU Operation Out of; /archives//html/Amps/2001-12/msg00456.html (7,831 bytes)
136. [AMPS] M/A Com fets ++ (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Dec 2001 21:39:52 -0500; Yes, it appears he simply mistyped his call a few times earlier, as N2NUU instead of N2NNU which would be an easy mistake. My search on Sandlabs only turned up N2NUU. N2NNU is in the data base as a; /archives//html/Amps/2001-12/msg00459.html (7,601 bytes)
137. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 30 Nov 2001 20:50:50 -0500; Check the size of the component, and the thermal conductivity. 20 watts of dissipation in the dielectric of a conventional 850 or 858 series doorknob would be a disaster. The part would never handle; /archives//html/Amps/2001-11/msg00001.html (8,993 bytes)
138. [AMPS] Coil Forms (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 12 Nov 2001 08:10:31 -0500; The loss difference is generally insignificant, because the primary field in the PVC is the magnetic field unless you are unwisely placing PVC where the electric field is highly concentrated. By far; /archives//html/Amps/2001-11/msg00181.html (8,199 bytes)
139. [AMPS] Constant Voltage (Sola) Transformer wanted (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 13 Nov 2001 09:39:41 -0500; If the application is for a capacitor input supply, good luck! You will need to restore the sine wave better than a sola transformer does, and have to use a greatly oversized regulator because of th; /archives//html/Amps/2001-11/msg00226.html (7,870 bytes)
140. [AMPS] Coil Forms (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 13 Nov 2001 09:39:41 -0500; Although I don't have the K6STI program, I have many other inductor Q programs and none of them hit close. One way to test the program is to raise the frequency and watch Q. 1.) Q is almost always ma; /archives//html/Amps/2001-11/msg00227.html (13,145 bytes)

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