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1. [AMPS] Need to pick your brain... (score: 1): Author: n0ss@socket.net (Tom Hammond); Date: Fri, 16 Apr 1999 15:07:55 -0500; Greetings: I'm trying to help a friend (WN0X) do some maintenance on his SB-220. The tuned input for 80M-20M yields a decent input impedance, but on 10M and 15M it's really(!) way off... to the point; /archives//html/Amps/1999-04/msg00313.html (9,296 bytes)
2. [AMPS] Need to pick your brain... (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 16 Apr 1999 20:23:55 -0700; ? A Pi-network (which is two L-networks in series) is typically resonant slightly below the operating frequency. A 21MHz tuned-input Pi-network that is resonant at 21MHz, will not work acceptably at; /archives//html/Amps/1999-04/msg00319.html (9,057 bytes)
3. [AMPS] Need to pick your brain... (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sat, 17 Apr 1999 10:25:04 -0400; In this case look at it in reverse. The input cap is for impedence matching to the 50 Ohm exciter. The output cap and L are the prime frequency determining elements. See what happens with 150 pf. Als; /archives//html/Amps/1999-04/msg00322.html (9,749 bytes)
4. [AMPS] Need to pick your brain... (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Sat, 17 Apr 1999 14:24:48 -0500; This is a mistake. An amplifier other than one in class A operation needs to be "driven" into its active region. As a result, the input impedance of the device varies substantially over the range of; /archives//html/Amps/1999-04/msg00327.html (8,535 bytes)
5. [AMPS] Need to pick your brain... (score: 1): Author: n0ss@socket.net (Tom Hammond); Date: Sat, 17 Apr 1999 16:51:06 -0500; The better question, I guess, should be "Why did a _second_ SB-220 turn in PERFECT readings on ALL BANDS when checked the very same way?". This (second) amp indicated points of resonance just barely; /archives//html/Amps/1999-04/msg00332.html (7,681 bytes)
6. [AMPS] Need to pick your brain... (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 20 Apr 1999 10:13:18 +0100; filters >which introduce various reactances at the output. Thus, there may be >bands where XC1 will need to have a reactance of other than 25 ohms. Rich is making a very good point here. Although we; /archives//html/Amps/1999-04/msg00355.html (11,289 bytes)

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