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21. Re: [Amps] Re: AMPS Link coupling (score: 1): Author: G3rzp@aol.com; Date: Sun, 9 Jan 2005 13:29:50 EST; There is no antenna matching network that has a lower Q than an L-network. This is not correct. A parallel tuned circuit with a coupling link, loaded by a high impedance antenna can have its LC ratio; /archives//html/Amps/2005-01/msg00150.html (7,334 bytes)
22. Re: [Amps] Re: AMPS Link coupling (score: 1): Author: G3rzp@aol.com; Date: Mon, 10 Jan 2005 03:56:07 EST; The minimum possible *loaded* Q that is required to transform between two resistances R2>R1, using any possible circuit, is sqrt(R2/R1 -1). Perfectly true if you don't use a transformer. The link cou; /archives//html/Amps/2005-01/msg00169.html (7,432 bytes)
23. [Amps] L networks (score: 1): Author: G3rzp@aol.com; Date: Tue, 11 Jan 2005 03:35:15 -0500; Having a bit more time, and being in a meeting in Paris (a VERY opulent meeting room it is, too!) I think this is true for a network of two compnonents. If you allow more components (e.g. my transfor; /archives//html/Amps/2005-01/msg00195.html (6,646 bytes)
24. Re: [Amps] Re: L networks (score: 1): Author: G3rzp@aol.com; Date: Tue, 11 Jan 2005 10:47:57 -0500; The matchbox does end up with variable Q, especially when you get a reactive component. Link coupling really needs a tight coupling so that hopefully the leakage reactance is minimised. This usually; /archives//html/Amps/2005-01/msg00205.html (6,935 bytes)
25. Re: [Amps] (OT) Radio Compass Indicators (score: 1): Author: G3rzp@aol.com; Date: Wed, 12 Jan 2005 03:12:55 -0500; There's one of the ARRL Antenna Compendium volumes has info on this, but I can't remember which one. 73 Peter (F/G3RZP - until Friday, then W7/G3RZP) _______________________________________________ A; /archives//html/Amps/2005-01/msg00227.html (6,443 bytes)
26. Re: [Amps] OT: RF Speech Processor?Kits - Final Final (score: 1): Author: G3rzp@aol.com; Date: Tue, 18 Jan 2005 08:29:23 -0500; The Plessey SL 1626 was originally intended for the CB AM market. It didn't have enough low pass filtering for the land mobile FM market, which had quite tight specs on the pre-emphasis and low pass; /archives//html/Amps/2005-01/msg00339.html (7,604 bytes)
27. Re: [Amps] Air Gap (score: 1): Author: G3rzp@aol.com; Date: Tue, 18 Jan 2005 08:34:20 -0500; The usual number to use is 30kV/inch for flashover in air between two balls. 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2005-01/msg00340.html (6,957 bytes)
28. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: G3rzp@aol.com; Date: Wed, 19 Jan 2005 01:55:12 -0500; I like the idea of a DC heater supply. However, there seems to be no information available on the effects of metal migration in the heater/filament, which, considering the currents involved and the t; /archives//html/Amps/2005-01/msg00361.html (7,340 bytes)
29. Re: [Amps] What is it called? (score: 1): Author: G3rzp@aol.com; Date: Sun, 23 Jan 2005 09:34:48 -0500; Generally speaking, the model engineering suppliers are very much cheaper than RS or Farnell, and in many cases, just as fast. Some of them can even supply 'off the shelf, next day delivery' such nic; /archives//html/Amps/2005-01/msg00480.html (8,913 bytes)
30. Re: [Amps] What is it called? (score: 1): Author: G3rzp@aol.com; Date: Sun, 23 Jan 2005 13:02:11 -0500; "My guess is because 4-40 screws have more holding power than a 4-36 screw does. This is due to more threads in the thickness of whatever it's screwed into, either tapped material or a nut. Fine thre; /archives//html/Amps/2005-01/msg00488.html (9,305 bytes)
31. [Amps] Re:10dB increase (score: 1): Author: G3rzp@aol.com; Date: Sun, 6 Feb 2005 07:40:34 EST; Generally speaking (and there may be honourable exceptions) the 'S' in 'S meter' and the 'S' in 'SWR meter' both mean that all readings from the device should be treated with suspicion. 73 Peter G3RZ; /archives//html/Amps/2005-02/msg00186.html (6,085 bytes)
32. [Amps] Re:10dB Increase (score: 1): Author: G3rzp@aol.com; Date: Sun, 6 Feb 2005 11:42:51 EST; Personally, I'd be a bit dubious about the propagation medium at HF staying stable within 3dB over long enough to do a mesurement, unless it was done on ground wave. 73 Peter G3RZP __________________; /archives//html/Amps/2005-02/msg00198.html (6,707 bytes)
33. Re: [Amps] 10dB and propagation (score: 1): Author: G3rzp@aol.com; Date: Mon, 7 Feb 2005 17:56:41 EST; I used a HP-355 step attenuator set, so S-meter calibration was out of the equation. But how stable was the propagation medium (what measurements to prove it?), and was a steady carrier used for meas; /archives//html/Amps/2005-02/msg00264.html (7,971 bytes)
34. Re: [Amps] Quick 220 outlet? (score: 1): Author: G3rzp@aol.com; Date: Wed, 9 Feb 2005 07:57:54 EST; Don't be foolish and think you can try detecting 120 or 240 with your fingers. You certainly can detect it with your fingers. The wisdom of so doing is completely another matter. I find the problem i; /archives//html/Amps/2005-02/msg00334.html (8,237 bytes)
35. Re: [Amps] De fibrillators (score: 1): Author: G3rzp@aol.com; Date: Thu, 10 Feb 2005 04:00:42 EST; De fibrillators built into pacemakers dump about 40 joules at up to 1200 volts into the heart from a capacitor. Protecting the pacemaker itself from that is quite a problem, requiring special ICs. No; /archives//html/Amps/2005-02/msg00387.html (6,433 bytes)
36. Re: [Amps] New FET's (score: 1): Author: G3rzp@aol.com; Date: Thu, 10 Feb 2005 08:38:37 EST; Semiconductors to MIL Spec for space use are MIL 883 level S. They are made in the same way on the same production line as the common or garden commercial variety (in most firms, anyway), but just ge; /archives//html/Amps/2005-02/msg00397.html (8,714 bytes)
37. Re: [Amps] Re: compact coils... (score: 1): Author: G3rzp@aol.com; Date: Wed, 16 Feb 2005 06:55:04 EST; The British Army D11 and D13 transmitters (which was also a Naval transmitter called the NT201, but in another colour scheme) used ferrite loading of the tank coil. That coil wound silver plated phos; /archives//html/Amps/2005-02/msg00547.html (8,000 bytes)
38. Re: [Amps] Re: compact coils... (score: 1): Author: G3rzp@aol.com; Date: Wed, 16 Feb 2005 07:24:11 EST; Are you certain that the core material was not powdered iron? Yup. I was surprised, but it's Neosid F14 material, suitable for tuned circuits up to about 4 or 5MHz. The loading was cylinders about 1.; /archives//html/Amps/2005-02/msg00549.html (7,965 bytes)
39. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1): Author: G3rzp@aol.com; Date: Sun, 20 Feb 2005 08:54:55 EST; A Pi-network is not resonant because it is two L-networks in series, and L-networks never operate at resonance. This depends upon your definition of resonance. The only definition that is mathematica; /archives//html/Amps/2005-02/msg00615.html (7,264 bytes)
40. Re: [Amps] Yaesu FL-2100B failure (score: 1): Author: G3rzp@aol.com; Date: Tue, 22 Feb 2005 05:47:09 -0500; Kevin, The relay may be sticking because of residual magnetism. A piece of paper between the relay poles, i.e the coil centre and the armature, will prove this - if it's residual magnetism, the relay; /archives//html/Amps/2005-02/msg00663.html (7,309 bytes)

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