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Total 22 documents matching your query.

1. [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 23 Apr 2013 09:52:15 -0700; I've been trying to find a good method to measure the inductance of large coils made out of tubing. For example, I have a coil made of 19 turns of 3/16" (about 4.8mm) tubing, 3.25" (8.3 cm) diameter; /archives//html/Amps/2013-04/msg00189.html (9,423 bytes)
2. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 23 Apr 2013 10:30:04 -0700; MFJ 259B antenna analyzer: measured inductance increased rapidly with frequency. Totally worthless. It's actually not bad if you choose a freq where the reactance is less than about 100 Ohms. So for; /archives//html/Amps/2013-04/msg00190.html (7,341 bytes)
3. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Tue, 23 Apr 2013 11:24:55 -0700; REPLY: That method is good, but there is another that I think is better. This can be done either in a already-built amplifier or breadboarded on the workbench. If you breadboard it you won't have the; /archives//html/Amps/2013-04/msg00191.html (8,239 bytes)
4. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Chris Wilson <chris@chriswilson.tv>; Date: Tue, 23 Apr 2013 20:17:41 +0100; <BIG SNIP> 23/04/2013 20:13 Watching this thread with great interest, especially the "wg=hat frequency to measure at" stuff. My AIM4170 is supposedly a good tool, it's the operator here that lacks k; /archives//html/Amps/2013-04/msg00192.html (8,355 bytes)
5. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Tue, 23 Apr 2013 12:56:25 -0700; REPLY: No such thing as too many questions, within reason of course. :-) According to theory, pure inductance does not vary with frequency, however the effective inductance DOES vary due to the effec; /archives//html/Amps/2013-04/msg00194.html (8,362 bytes)
6. Re: [Amps] Measuring tank coil inductance (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 23 Apr 2013 18:14:48 -0400; When you see specs in ARRL build plans for say a .8 uH indctor, or see a 5 uH inductor advertised, there must be a definitive measuring method to arrive at the value, surely? Glad you posted, I feel; /archives//html/Amps/2013-04/msg00198.html (13,307 bytes)
7. [Amps] Measuring tank coil inductance (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 24 Apr 2013 01:35:13 -0700; I've been trying to find a good method to measure the inductance of large coils made out of tubing. For example, I have a coil made of 19 turns of 3/16" (about 4.8mm) tubing, 3.25" (8.3 cm) diameter; /archives//html/Amps/2013-04/msg00201.html (11,702 bytes)
8. [Amps] Measuring tank coil inductance (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 24 Apr 2013 18:27:51 -0600; As others have expounded on their preferred ways to do this, I will supplement what was said (no disagreement here) with one more technique that I have used for 20 years, and built some high power RF; /archives//html/Amps/2013-04/msg00204.html (9,353 bytes)
9. Re: [Amps] Measuring tank coil inductance (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 24 Apr 2013 21:20:25 -0400; Ive had a 4815A for about 15 years courtesy of a company auction. I find it cumbersome for amp work but ideal for chokes and also phased verticals LC networks. It mostly sits on a basement steel shel; /archives//html/Amps/2013-04/msg00205.html (11,041 bytes)
10. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 25 Apr 2013 09:50:48 -0700 (PDT); <snip> Hi Vic, I have an ancient HP 4260A bridge which suffices for most measurements. However, for tank coils, I use a Time Constant circuit which is a variation of the design published in the Jan.; /archives//html/Amps/2013-04/msg00210.html (8,454 bytes)
11. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 25 Apr 2013 17:29:02 -0700; Thanks to everyone for your answers. Here is what I decided to do: I made a temporary hookup which includes the tube, the plate choke, the bandswitch and the pi-net components. I intend to set up the; /archives//html/Amps/2013-04/msg00216.html (10,548 bytes)
12. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 25 Apr 2013 18:39:22 -0700; REPLY: If you're going to use the AADE unit to set the capacitance in-circuit, be sure to disconnect the plate choke. Bill, W6WRT _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2013-04/msg00217.html (8,162 bytes)
13. [Amps] Measuring tank coil inductance (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 25 Apr 2013 20:04:11 -0700; REPLY: If you're going to use the AADE unit to set the capacitance in-circuit, be sure to disconnect the plate choke. Bill, W6WRT C1 tune cap on 80m.. A typ 180 uh plate choke will eat 40 pf from the; /archives//html/Amps/2013-04/msg00218.html (9,823 bytes)
14. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 25 Apr 2013 21:44:38 -0700; I have learned that to use the AADE successfully you have to disconnect everything from the component you are testing! I made a temporary hookup which includes the tube, the plate choke, the bandswit; /archives//html/Amps/2013-04/msg00219.html (9,537 bytes)
15. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 25 Apr 2013 21:51:59 -0700; The GM3SEK spreadsheet allows for the influence of the plate choke. But if you compute the value of the tune capacitor without considering the choke, then you would not connect the choke while doing; /archives//html/Amps/2013-04/msg00220.html (10,929 bytes)
16. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 25 Apr 2013 22:56:17 -0700; REPLY: Yes and no. In the case of the tune cap, you also need to include the tube's output capacitance and any stray capacitance to ground. But you MUST disconnect the plate choke since it is a very; /archives//html/Amps/2013-04/msg00221.html (9,161 bytes)
17. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 25 Apr 2013 23:10:35 -0700; REPLY: Whoa yourself. My comment to disconnect the plate choke was IF YOU ARE USING THE AADE UNIT to measure in-circuit capacitance. Why? The AADE unit uses a very low frequency relative to the tank; /archives//html/Amps/2013-04/msg00222.html (8,806 bytes)
18. Re: [Amps] Measuring tank coil inductance (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Fri, 26 Apr 2013 10:28:40 +0100; Using accurate theories, that is not true, although it is a very good approximation to several GHz, so totally irrelevant in this context, but I thought I would bring to peoples attention that to say; /archives//html/Amps/2013-04/msg00223.html (11,928 bytes)
19. Re: [Amps] Measuring tank coil inductance (score: 1): Author: "Ian White" <gm3sek@ifwtech.co.uk>; Date: Fri, 26 Apr 2013 15:44:27 +0100; solves is Ahem... it certainly doesn't say "determine" the load impedance because you can't do that. The wording I used throughout was "ESTIMATE the load resistance". The method using "k" can only po; /archives//html/Amps/2013-04/msg00227.html (11,195 bytes)
20. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 26 Apr 2013 08:49:29 -0700; Yes, I stand corrected. The word ESTIMATE was used! A lot. I was just surprised at how different the value from the load line was, since I've seen the formula for estimating the impedance using the k; /archives//html/Amps/2013-04/msg00230.html (13,897 bytes)

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