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1. [AMPS] Practical PI Nets (score: 1): Author: 2@vc.net (measures); Date: Mon, 1 May 2000 03:33:50 -0700; ? A Pi-network is two L networks in series. An L network can be resonant near the operating frequency but it can never be resonant on the operating frequency. cheers - Rich..., 805.386.3734, www.vcn; /archives//html/Amps/2000-05/msg00002.html (9,200 bytes)
2. [AMPS] Practical PI Nets (score: 1): Author: rfamps@ic24.net (Steve Thompson); Date: Mon, 1 May 2000 08:49:25 +0100; snip and frequency Power level of the test signal is an issue on the input side of a g-g amp, but it shouldn't matter on the anode side. Be a little careful - physically big caps can have significant; /archives//html/Amps/2000-05/msg00004.html (8,087 bytes)
3. [AMPS] Practical PI Nets (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 1 May 2000 16:46:15 +0100; You can get a reading by connecting a low-level impedance meter to the input side of a "hot" amp (all operating voltages applied) but it won't necessarily represent the impedance at full drive. You c; /archives//html/Amps/2000-05/msg00010.html (9,113 bytes)
4. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 07:20:47 +0100; One not too expensive device is the Almost All Digital Electronics L-C meter. It's cheap, pretty accurate, and comes as a kit that took me under an hour to build. It is worth changing the 5 volt regu; /archives//html/Amps/2000-05/msg00016.html (8,385 bytes)
5. [AMPS] Practical PI Nets (score: 1): Author: 2@vc.net (measures); Date: Tue, 2 May 2000 06:01:38 -0700; The apparent resonant frequency of two L networks in series is not the operating frequency. cheers, Peter - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/2000-05/msg00017.html (8,685 bytes)
6. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 14:22:55 +0100; the Previously, Rich has defined resonance as the frequency where XL = XC. In low Q networks, this isn't necessarily so, and further, the only definition that holds correctly for both series and para; /archives//html/Amps/2000-05/msg00019.html (9,236 bytes)
7. [AMPS] Practical PI Nets (score: 1): Author: Wt8r@aol.com (Wt8r@aol.com); Date: Tue, 2 May 2000 09:34:09 EDT; -- - Rich, Could you give an approximation to guesstimate the difference in the apparent measured frequency and the operating frequency? Or what factors determine the difference ? Regards, Dave, WT8R; /archives//html/Amps/2000-05/msg00020.html (9,483 bytes)
8. [AMPS] Practical PI Nets (score: 1): Author: 2@vc.net (measures); Date: Tue, 2 May 2000 07:29:16 -0700; As I recall, on 80m the difference is typically hundreds of kilohertz, with the resonance of the tank being lower than the operating frequency where the tank was adjusted. The biggest factor is Q. T; /archives//html/Amps/2000-05/msg00021.html (10,170 bytes)
9. [AMPS] Practical PI Nets (score: 1): Author: 2@vc.net (measures); Date: Tue, 2 May 2000 07:29:14 -0700; ? prove the phenomenon for yourselves if you are curious. Tune up a linear amplifier correctly on say 3900KHz. Shut the amplifier down and pull the plug. Measure the resonant frequency of the Pi-net; /archives//html/Amps/2000-05/msg00022.html (9,783 bytes)
10. [AMPS] Practical PI Nets (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Tue, 2 May 2000 16:11:28 +0100; Good enough ? It is excellent. It can even measure a difference of 1pF reliably. I think the 0.01pF resolution is a bit optimistic and the calibration is not perfect on my version, but it is good eno; /archives//html/Amps/2000-05/msg00024.html (9,380 bytes)
11. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 16:31:09 +0100; That is yet another definition of resonance. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/2000-05/msg00025.html (8,772 bytes)
12. [AMPS] Practical PI Nets (score: 1): Author: 2@vc.net (measures); Date: Tue, 2 May 2000 08:55:12 -0700; definition.? Later Peter - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQ; /archives//html/Amps/2000-05/msg00026.html (8,592 bytes)
13. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 17:00:29 +0100; Call it what you will - that 'resonant frequency' is a different one to that achieved by other definitions. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@cont; /archives//html/Amps/2000-05/msg00027.html (8,505 bytes)
14. [AMPS] Practical PI Nets (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 2 May 2000 11:07:31 -0500; I must agree with all who recommend the Almost All Digital Electronics L/C meter. It is one of my most-used pieces of test gear. It is about the size of 2 packs of cigarettes, and battery powered, ma; /archives//html/Amps/2000-05/msg00028.html (11,405 bytes)
15. [AMPS] Practical PI Nets (score: 1): Author: 2@vc.net (measures); Date: Tue, 2 May 2000 11:32:46 -0700; Resonance is where yo' dipmeter finds it. . If the dipmeter does not dip on a certain frequency, the tank circuit is not resonant on that frequency. . . later, Peter - Rich..., 805.386.3734, www.vcn; /archives//html/Amps/2000-05/msg00029.html (8,516 bytes)
16. [AMPS] Practical PI Nets (score: 1): Author: RMcGraw@blomand.net (Bob & Linda McGraw K4TAX); Date: Tue, 02 May 2000 20:35:46 -0500; I seem to recall being told to "tune the plate capacitor to the right side of resonance". This gave a plate current indication of slightly off of the true dip in current. As I recall, this produced a; /archives//html/Amps/2000-05/msg00033.html (10,367 bytes)
17. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 3 May 2000 06:36:47 +0100; Rich, you sound like Humpty Dumpty - 'Words mean what I want them to' First you defined resonance as where XL = XC. Now it's where the dip meter finds it. For circuits with low Q, they aren't the sam; /archives//html/Amps/2000-05/msg00034.html (8,945 bytes)
18. [AMPS] Practical PI Nets (score: 1): Author: rfamps@ic24.net (Steve Thompson); Date: Wed, 3 May 2000 07:58:38 +0100; A true definition of resonance has to work in all systems, be it hydraulic, mechanical or electrical. Then you figure out how to express it for the system you are working in. Steve --Original Message; /archives//html/Amps/2000-05/msg00035.html (9,776 bytes)
19. [AMPS] Practical PI Nets (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Wed, 03 May 2000 23:54:23 +0100; Hi Peter, I always thought the above was strictly true until just recently. I have been working with my YC156 project off and on for a while now and have been looking hard at the required anode load.; /archives//html/Amps/2000-05/msg00040.html (8,778 bytes)
20. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 4 May 2000 06:52:26 +0100; Larry, Are you taking into account the output capacitance of the tube? That means that the tank on its own will look inductive; the complete circuit will look resistive. 73 Peter G3RZP -- FAQ on WWW:; /archives//html/Amps/2000-05/msg00041.html (8,034 bytes)

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