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Total 16 documents matching your query.

1. Topband: measuring transformer core inductance (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Fri, 14 Nov 2003 12:48:18 -0500
Steve KK7UV wrote: . My question to the group is what do you use to measure the inductance of the windings so you know when you reach the desired ratios? I've had miserable luck doing it by formula a
/archives//html/Topband/2003-11/msg00110.html (8,168 bytes)

2. Re: Topband: measuring transformer core inductance (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Fri, 14 Nov 2003 23:04:18 -0500
At 08:11 PM 11/14/03, you wrote: If you damage a core with DC, you can heat it to the Curie temperature to demagnetize it. Rick N6RK You can also essentially demagnetize the core by cycling it around
/archives//html/Topband/2003-11/msg00113.html (7,968 bytes)

3. RE: Topband: measuring transformer core inductance (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Mon, 17 Nov 2003 17:52:19 -0500
At 11:22 AM 11/17/03, Richard Karlquist wrote: Also, the RF chokes used to feed the DC into the coax cannot be wound on non-gapped ferrite cores, like toroids. I see this all the time in commercial e
/archives//html/Topband/2003-11/msg00121.html (9,588 bytes)

4. Re: Topband: core inductance and current - some measurements. (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Mon, 17 Nov 2003 22:25:40 -0500
At 08:21 PM 11/17/03, N0TT wrote: The indicated inductances with just *3-1/3 turns* on the 73 mix Binocular core were: 0 ma 90.04 uhy 15 ma 90.04 uhy 29 ma 89.71 uhy 58 ma 97.11 uhy 110 ma 75.41 uhy
/archives//html/Topband/2003-11/msg00124.html (8,613 bytes)

5. Re: Topband: phantom click cop (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Mon, 02 Feb 2004 20:03:12 -0500
At 05:21 PM 2/2/04, Ron, WA9IRV, wrote: Twice in the last 4 nights I have been told by an anonymous station that I had clicks "10 kc wide". He wouldn't ID when requested. After the first incident, I
/archives//html/Topband/2004-02/msg00009.html (7,873 bytes)

6. Topband: Binocular Cores (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Tue, 02 Nov 2004 17:08:43 -0500
Bill: In response to your question: "Can someone give me the name of a supplier where I can obtain a small quantity of the Fair-Rite cores which several of you are using for Beverage matching transfo
/archives//html/Topband/2004-11/msg00015.html (7,683 bytes)

7. Topband: Working KV4FZ and KP2ZZ (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Wed, 02 Feb 2005 11:28:40 -0500
I wonder whether others have had similar experiences in having great difficulty working certain stations. In my case, for the past several years I have had real problems trying to work Herb, KV4FZ. I
/archives//html/Topband/2005-02/msg00043.html (7,917 bytes)

8. Topband: Re: Working KV4FZ and KP2ZZ (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Wed, 02 Feb 2005 15:21:33 -0500
I made a mistake in listing G3PGA in my previous posting. Of course, I should have said G3PQA. Apologies to John ! Bob VE3OSZ _______________________________________________ Topband mailing list Topb
/archives//html/Topband/2005-02/msg00049.html (6,604 bytes)

9. Topband: Field Day (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Thu, 23 Jun 2005 23:20:49 -0400
In 2000 the Ottawa area clubs got together to run a mammoth Field Day operation with 35 transmitters active. Together with VA3TJP, I ran the 160 CW station. We ran 100 watts to a low dipole and got 4
/archives//html/Topband/2005-06/msg00037.html (6,432 bytes)

10. Re: Topband: VE3OSZ article on QEX may/june 2005 (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Wed, 06 Jul 2005 21:51:42 -0400
Several topband reflector subscribers have contacted me following the July 2 message from Luis, IV3PRK, about my PLL filter article. In case others are interested in building this circuit I should po
/archives//html/Topband/2005-07/msg00003.html (7,598 bytes)

11. Re: Topband: VE3OSZ article on QEX may/june 2005 (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Thu, 07 Jul 2005 13:04:51 -0400
In Figure 4, in the section of the schematic involving U1 and the adjacent 1/2 U2, the following corrections should be made: 1. the 1000 pF capacitor should be shown connected between pins 7 and 8 of
/archives//html/Topband/2005-07/msg00004.html (7,713 bytes)

12. Topband: Technology "QSO's" (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Sun, 13 Nov 2005 15:39:06 -0500
"If I cannot decode a weak signal with my own ears (not eyes), it's not a genuine "QSO" in my book." What is a QSO in the context of amateur radio ? To me, a QSO is a completed two-way communication
/archives//html/Topband/2005-11/msg00127.html (8,072 bytes)

13. Topband: IS0/K7QB (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Fri, 07 Jul 2006 10:49:43 -0400
Today I received a QSL from IS0/K7QB for a 160M QSO. A new country for me. Not only did Mauro send the QSL but he also returned a green stamp to me ! Now that is a true gentlemanly act. I shall certa
/archives//html/Topband/2006-07/msg00006.html (6,217 bytes)

14. Re: Topband: Effect of DC on Ferrite Toroids? (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Tue, 09 Jan 2007 10:29:27 -0500
Charles: I'm not sure that this has an application for Beverage matching, but I have made use of the variable permeabilty property in remotely tuning a loop antenna. This is done by controlling dc i
/archives//html/Topband/2007-01/msg00146.html (7,948 bytes)

15. Re: Topband: Getting started on 160 (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Sat, 28 Jun 2008 20:54:17 -0400
"Why dont you just connect-up your 100W to your inv L and get operating. Best way to learn about the band. You'll work plenty and can think about increasing power and other refinements as you gain ha
/archives//html/Topband/2008-06/msg00079.html (8,633 bytes)

16. Topband: Memories of Top Band (score: 1)
Author: Robert Kavanagh <ve3osz@rac.ca>
Date: Mon, 07 Jul 2008 11:32:28 -0400
After reading the interesting recollections of the early days on 160 I was provoked to browse through my early log books for topband. After having my first QSO (on 80) in April 1951 I finally got my
/archives//html/Topband/2008-07/msg00057.html (7,638 bytes)

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