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Total 21 documents matching your query.

1. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 2 Feb 99 09:20:48 -0600; Howdy all, Just wanted to let everyone know how simple an MFJ-259 makes tuning matching circuits. It's like child's play. Last night I did the input circuits for my amp. I simulated the impedance of; /archives//html/Amps/1999-02/msg00058.html (8,855 bytes)
2. [AMPS] MFJ-259 and matching circuits (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 Feb 1999 15:27:27 -0000; in blocking How good is the simulation? Does it play well as an amp at 1500 watts out? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrat; /archives//html/Amps/1999-02/msg00059.html (8,260 bytes)
3. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 2 Feb 99 09:57:24 -0600; Ha! Ha! No idea! Kind of hard to get a couple resistors and a cap to ground to transmit 1500 Watts! Actually, the cool thing was that the L & C values I calculated were very close to the real world; /archives//html/Amps/1999-02/msg00060.html (8,586 bytes)
4. [AMPS] MFJ-259 and matching circuits (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 Feb 1999 16:05:28 -0000; ground to I'll reserve judgement then, Look forward to hearing how well it works out when used in anger. Not that I'm cynical............... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/a; /archives//html/Amps/1999-02/msg00061.html (8,440 bytes)
5. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 2 Feb 99 10:24:45 -0600; I guess I don't understand British humor or what Peter is getting at. Am I dense? (no snide comments, please). 73, Jon KE9NA -- Jon Ogden jono@enteract.com www.qsl.net/ke9na "A life lived in fear is; /archives//html/Amps/1999-02/msg00062.html (8,752 bytes)
6. [AMPS] MFJ-259 and matching circuits (score: 1): Author: lschaier@avotec.com (Len Schaier); Date: Tue, 02 Feb 1999 11:43:12 -0500; Jon, Have you ever used the Autek RF1 and, if so, how do they compare? Len -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@; /archives//html/Amps/1999-02/msg00063.html (10,499 bytes)
7. [AMPS] MFJ-259 and matching circuits (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 Feb 1999 16:54:13 -0000; Just that it's fine if your assumptions on input impedance are correct. If they aren't, then you're no better off using the MFJ than any other method. So the question comes down to this: Having set; /archives//html/Amps/1999-02/msg00064.html (9,318 bytes)
8. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 2 Feb 99 11:18:54 -0600; Well, I'd agree. My assumption on input impedance is based on the average driving impedance of a grounded-grid 4-1000A. This is about 110 Ohms. The input capacitance for the 4-1000A is about 27 pF.; /archives//html/Amps/1999-02/msg00067.html (9,448 bytes)
9. [AMPS] MFJ-259 and matching circuits (score: 1): Author: ah6oy@lava.net (Jim AH6OY); Date: Tue, 2 Feb 1999 07:30:58 -1000; I think the RF-1 is the best. So does KH6CTQ and that's saying alot. It's touchy on the adjust when you first start using it but when you finally learn you are dealing with a fine instrument you'll b; /archives//html/Amps/1999-02/msg00071.html (9,019 bytes)
10. [AMPS] MFJ-259 and matching circuits (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 2 Feb 1999 11:06:38 -0800; ? Assuming that a g-g input is like a resistor is bound to bring some, Jon. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Su; /archives//html/Amps/1999-02/msg00078.html (9,409 bytes)
11. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 2 Feb 99 16:24:32 -0600; OK for all of you who doubt it then. What other assumption can one make? The tube is spec'd for an "average" driving impedance of 110 Ohms with an input capacitance of 27 pF. Last time I looked, Ohm; /archives//html/Amps/1999-02/msg00082.html (10,770 bytes)
12. [AMPS] MFJ-259 and matching circuits (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 2 Feb 1999 22:28:28 -0800; ? The cathode is like a diode that is driven with pos. and neg. potentials. Heavy current flows on neg. No current flows on pos. A resistor this is not. ? 110 ohms could be close. In this case, the; /archives//html/Amps/1999-02/msg00086.html (11,654 bytes)
13. [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)
14. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 3 Feb 99 09:39:52 -0600; Agreed. However, even a diode has an equivalent "impedance." Yes, it is one that varies with drive, but it is an impedance none the less and still has an "average" value over the drive cycle. That's; /archives//html/Amps/1999-02/msg00095.html (11,887 bytes)
15. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 3 Feb 99 09:46:54 -0600; Theoretically, yes. However, interfacing the MFJ-259 or any other impedance measuring device to the cathode pins is a challenge and error will be introduced there. Rather, one could set the impedanc; /archives//html/Amps/1999-02/msg00096.html (10,381 bytes)
16. [AMPS] MFJ-259 and matching circuits (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 3 Feb 99 09:54:11 -0600; Well put, Bill. I don't think I've heard anyone put it so deftly and so well! Good job! 73, Jon KE9NA -- Jon Ogden jono@enteract.com www.qsl.net/ke9na "A life lived in fear is a life half lived." --; /archives//html/Amps/1999-02/msg00098.html (9,628 bytes)
17. [AMPS] MFJ-259 and matching circuits (score: 1): Author: johnf@futurenet.co.za (John Fielding); Date: Wed, 3 Feb 1999 16:52:22 +0200; A subtle point I think all have missed is that 50 ohms only exists in the lab!! However, both techniques will work equally well, I think if I didn't have a $100k network analyser at my disposal I wou; /archives//html/Amps/1999-02/msg00103.html (13,486 bytes)
18. [AMPS] MFJ-259 and matching circuits (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 3 Feb 1999 09:52:45 -0800; ? Agreed. . Perhaps it would be easier to measure the L and C of a Q=2, working-well driving the cathode, tuned input, and then scale the values for other frequencies? However, since the Chebyshev f; /archives//html/Amps/1999-02/msg00108.html (10,406 bytes)
19. [AMPS] MFJ-259 and matching circuits (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 3 Feb 1999 09:52:47 -0800; ? My position is that it is not very logical to try and simulate the highly complex cathode-Z of a tube if you have one in-hand. ? It gets you in the ballpark. Making L and C2 adjustable is not a ba; /archives//html/Amps/1999-02/msg00109.html (8,752 bytes)
20. [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)

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