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321. Re: [TenTec] OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 18 Nov 2010 08:41:52 +0000; John, It's very difficult to get decent common-mode impedance across a 4:1 frequency band with an air-cored choke - they are too "High-Q". A further problem caused by their high Q is that their imped; /archives//html/TenTec/2010-11/msg00243.html (9,442 bytes)
322. Re: [TenTec] OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 18 Nov 2010 22:23:55 +0000; Rob, Why use 100ft of coax on a 1.5ft diameter form, when 3ft or so of coax on a ferrite core would give you much higher CM impedance than that; and better still, it would be Resistive rather than Re; /archives//html/TenTec/2010-11/msg00253.html (9,139 bytes)
323. Re: [TenTec] OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 19 Nov 2010 11:30:06 +0000; A Resistive choke will *always* reduce CM currents; a Reactive choke may not. Here's an extract from an EMC handbook: "For high frequency applications, ferrites should be viewed as frequency dependen; /archives//html/TenTec/2010-11/msg00258.html (11,257 bytes)
324. Re: [TenTec] OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 20 Nov 2010 08:44:54 +0000; Rob, No, it doesn't annoy me; and I apologise if I have given offence by pressing the point too much. It's just that I find a disappointing lack of understanding within the ham community about the pr; /archives//html/TenTec/2010-11/msg00275.html (8,987 bytes)
325. Re: [TenTec] OT: Indoor antenna (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 29 Nov 2010 17:34:17 +0000; Factor in an uncertainty of up to 5% to allow for variations in wire velocity factor, further uncertainties due to the environment (ground conditions etc), and plain errors because he has assumed tha; /archives//html/TenTec/2010-11/msg00474.html (9,982 bytes)
326. Re: [TenTec] [Fwd: Line Isolator Balun (sorta) question.] (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 06 Aug 2010 21:18:48 +0100; Take a look at the 8th line here: http://www.karinya.net/g3txq/chokes/ 10 FB-31-1020 beads slipped over RG213 produces a choke which is resitive from 4MHz to beyond 28MHz. However, I would agree that; /archives//html/TenTec/2010-08/msg00038.html (10,273 bytes)
327. Re: [TenTec] [Fwd: Line Isolator Balun (sorta) question.] (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 06 Aug 2010 21:43:09 +0100; It might be worth expanding on Jim's valuable point about the undesirability of chokes which have Reactive CM impedance, rather than Resistive. Here's an experiment those of you with antenna modellin; /archives//html/TenTec/2010-08/msg00039.html (11,444 bytes)
328. Re: [TenTec] [Fwd: Line Isolator Balun (sorta) question.] (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 07 Aug 2010 09:12:25 +0100; It's actually short of an electrical half-wavelength, which gives it about 300 ohms of series capacitive reactance. That reactance is then cancelled by the inductive CM choke, leading to a lower CM p; /archives//html/TenTec/2010-08/msg00047.html (11,725 bytes)
329. Re: [TenTec] [Fwd: Line Isolator Balun (sorta) question.] (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 07 Aug 2010 10:26:54 +0100; Just to expand my previous posting: With a 20ohm ground connection at the bottom of the braid, if the reactance seen at the dipole feedpoint looking into the braid path were cancelled by the CM choke; /archives//html/TenTec/2010-08/msg00048.html (12,804 bytes)
330. Re: [TenTec] [Fwd: Line Isolator Balun (sorta) question.] (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sun, 08 Aug 2010 19:15:44 +0100; The chances of a Reactive choke decreasing the feedline CM path impedance may be much higher than many folk might think, particularly on a multiband antenna. Trying to assess the CM path impedance on; /archives//html/TenTec/2010-08/msg00065.html (12,116 bytes)
331. Re: [TenTec] [Fwd: Line Isolator Balun (sorta) question.] (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 09 Aug 2010 19:59:07 +0100; Dressing the feedline at right angles to the dipoles stops *induced* common-mode current, but it does nothing to stop *conducted* common-mode current if the feedline is coax. The model I investigated; /archives//html/TenTec/2010-08/msg00093.html (9,845 bytes)
332. Re: [TenTec] Agronaut Manual (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 19 May 2010 08:56:34 +0100; I'm still trying to work out whether an "Agronaut" is an Argonaut which is causing you lots of aggravation, or a new rig specially designed for _Field _Day :) Sorry - just couldn't resist! Steve G3TX; /archives//html/TenTec/2010-05/msg00193.html (7,896 bytes)
333. Re: [TenTec] OMNI VI VXCO help needed DK5AD (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sun, 04 Apr 2010 17:38:32 +0100; C31 is a frequency adjust trimmer in series with the original Oven Controlled crystal. The TCXO modification replaces that crystal oscillator and its buffer, and removes power from them. Adjusting C3; /archives//html/TenTec/2010-04/msg00057.html (7,684 bytes)
334. Re: [TenTec] 238 Tuner (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 22 Feb 2010 16:24:25 +0000; It frustrates me that TT switch that external capacitor into play as early as switch position 3 (out of 5) on the LoZ side. I've often needed a pretty large capacitor for my 160m antenna, and switchi; /archives//html/TenTec/2010-02/msg00288.html (7,598 bytes)
335. Re: [TenTec] antenna analyzer reading? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Tue, 23 Feb 2010 23:10:28 +0000; If you want to "dig a little deeper" and see how a local tuner affects the system match at a remote antenna feedpoint, you might like to take a look at the worked example here: http://www.karinya.net; /archives//html/TenTec/2010-02/msg00310.html (10,459 bytes)
336. Re: [TenTec] antenna analyzer reading? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 24 Feb 2010 17:06:20 +0000; James, Thanks! I must take a new photo of the shack - there's now another CorsairII alongside the existing CorsairII and OmniVI !! 73, Steve G3TXQ == James -K8JHR ==; /archives//html/TenTec/2010-02/msg00320.html (10,755 bytes)
337. Re: [TenTec] Corsair AGC problem (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 15 Jan 2010 12:42:08 +0000; Gil, I had that problem and it turned out to be a faulty front-panel switch. You can check by temporarily lifting connector #92 from the IF/AF Board - that should bring the AGC on in the FAST mode. I; /archives//html/TenTec/2010-01/msg00165.html (9,085 bytes)
338. Re: [TenTec] Corsair AGC problem (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Jan 2010 09:19:51 +0000; Gil, The audio pick-off point for the AGC circuitry is _before_ the AF Gain control, so it shouldn't affect the AGC threshold - if it does something's wrong. Or do you mean that the RF Gain has to be; /archives//html/TenTec/2010-01/msg00172.html (9,725 bytes)
339. Re: [TenTec] Corsair AGC problem (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 18 Jan 2010 10:18:33 +0000; Gil, In my Corsair II manual, it's mentioned towards the bottom of page 2-4 under the heading "VFO IN-OUT" The jumper goes between the VFO IN & OUT sockets which are at bottom right of the rear panel; /archives//html/TenTec/2010-01/msg00205.html (8,405 bytes)
340. Re: [TenTec] Corsair AGC switch (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sun, 24 Jan 2010 08:45:42 +0000; I had the same problem 6 months ago - it was mechanical failure, as Jerry said. If yours is the same as mine, it is possible to tell because the "action" feels subtley different. TT were able to supp; /archives//html/TenTec/2010-01/msg00323.html (7,514 bytes)

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