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Total 87 documents matching your query.

1. RE: Topband: 160 Meter BALUNS (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 23 Dec 2003 19:27:01 -0500
Tom, If you get the chance could you try a coil that is tapered? I envision something along the lines of wrapping coax around those orange cones that are used at roadwork sites. There is a company (
/archives//html/Topband/2003-12/msg00200.html (8,302 bytes)

2. RE: Topband: 160 Meter BALUNS (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 24 Dec 2003 08:57:18 -0500
These baluns do work well. I use them on all my beams and tribanders. However, I use teflon coax which eliminates the need to seal anything. James Wolf, KR9U _________________________________________
/archives//html/Topband/2003-12/msg00207.html (12,051 bytes)

3. RE: Topband: Keying from CT logging program (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sat, 31 Jan 2004 10:39:02 -0500
Not being familiar with the drive requirements of the amp or the limitations of the transceiver, it seems you could parallel the two paths using a steering diode in series with each control line. Jim
/archives//html/Topband/2004-01/msg00324.html (9,063 bytes)

4. RE: Topband: Invisable Fence Issues (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 11 Feb 2004 09:49:28 -0500
Scott, I had this problem sometime back. I borrowed the neighbors fence generator and found that pulse was a 15 kHz square wave at around 30 volts. What you want to do is round off the square wave to
/archives//html/Topband/2004-02/msg00161.html (8,776 bytes)

5. RE: Topband: Wire closeness in two wire Beverage (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 25 Aug 2004 18:05:33 -0500
Hi Hermod, I have used a twisted pair with good results. By adjusting the phase, I have achieved F/B results greater than 40 dB. James Wolf, KR9U _______________________________________________ Topb
/archives//html/Topband/2004-08/msg00085.html (8,224 bytes)

6. Re: Topband: More - lightning protection on 4 sq (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sat, 14 Jun 2008 18:36:49 -0400
The series capacitor exists in the Polyphaser box to allow static voltage to climb high enough to trigger the gas discharge tube if there is a DC ground in the receiver. Many receivers have an input
/archives//html/Topband/2008-06/msg00020.html (9,212 bytes)

7. Re: Topband: Lightning protectors (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sun, 15 Jun 2008 12:50:46 -0400
I have a couple VHF protectors, and see them on ebay much more often than the HF protectors. Is there any reason I should not be able to take a VHF protector and put in an .01 cap and use it on HF. I
/archives//html/Topband/2008-06/msg00031.html (9,936 bytes)

8. Re: Topband: Binocular transformer design (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Mon, 5 Jan 2009 00:29:30 -0500
I am making a few tansformers for a 75 to 500 ohm K9AY loop which per W8JI's design in ON4UN's book call for a 5 pass secondary - which is 2 1/2 turns through the binocular core. The problem however
/archives//html/Topband/2009-01/msg00029.html (8,871 bytes)

9. Re: Topband: K9AY relay box damage (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Fri, 13 Jan 2012 22:31:50 -0500
Nandu, The relay part number is an OJE-SH-112DM,095 http://www.mouser.com/ProductDetail/TE-Connectivity/OJE-SH-112DM095/?qs=sUf8 GY5SBds1tCJVLf5YAw%3d%3d Jim, KR9U __________ Hi All, I have managed t
/archives//html/Topband/2012-01/msg00171.html (7,499 bytes)

10. Re: Topband: Take a look at THIS! (score: 1)
Author: jbwolf@comcast.net
Date: Mon, 2 Jul 2012 18:55:00 +0000 (UTC)
You didn't comment whether or not you were you on the air at the time or how far from the ground the change in diameter is. However, I see a Coyote - jumping straight up in the air. Jim,  KR9U Hi Gen
/archives//html/Topband/2012-07/msg00017.html (7,676 bytes)

11. Re: Topband: High power Transistor question (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Thu, 5 Jul 2012 18:44:21 -0400
It appears that an amateur radio amp would benefit from two of these devices. Jim, KR9U --Original Message-- From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com] On Behalf Of
/archives//html/Topband/2012-07/msg00074.html (7,967 bytes)

12. Re: Topband: Tremendous antenna modeling update- NEC2 and NEC4 in multithreaded assembler (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Thu, 23 Aug 2012 16:22:13 -0400
I am using this engine and it is faster. I'm not sure about the 10x though. Jim, KR9U --Original Message-- From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com] On Behalf Of To
/archives//html/Topband/2012-08/msg00284.html (8,063 bytes)

13. Re: Topband: RX epiphany? (score: 1)
Author: jbwolf@comcast.net
Date: Thu, 13 Sep 2012 15:44:44 +0000 (UTC)
Tom, In your opinion; given a receive antenna with negative gain, at what level does the negative gain start to come into play? -25 dBi, -35 dBI  ? Jim -- Original Message -- Dave, Just curious. Why
/archives//html/Topband/2012-09/msg00075.html (8,758 bytes)

14. Re: Topband: dipole height (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 30 Oct 2012 18:22:21 -0400
dipole has very or none directivity, so low RDF or directivity does not improve signal noise. In general, this is the case, but it is not always true. Consider that you can have an antenna with a hi
/archives//html/Topband/2012-10/msg00373.html (8,288 bytes)

15. Re: Topband: one-way propagation (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Mon, 3 Dec 2012 18:35:16 -0500
To expand a little on Carl's explanation, the ionosphere is not as isotropy as we commonly imagine - in that it is not a nice smooth balloon shaped surface to bounce a signal off of. Instead, there a
/archives//html/Topband/2012-12/msg00080.html (10,215 bytes)

16. Re: Topband: one-way propagation (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 4 Dec 2012 15:41:08 -0500
Tom, It is a known that the ionosphere is not a perfect sphere. It is always moving and it is lumpy and tilted. Together these occurrences can cause focusing and defocusing of the wave due to deformi
/archives//html/Topband/2012-12/msg00128.html (10,406 bytes)

17. Re: Topband: one-way propagation (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 4 Dec 2012 19:13:25 -0500
Carlos, That is also true. The incident wave when entering into the ionosphere splits into two elliptically polarized waves, and are likely in opposite polarization from each other as well as having
/archives//html/Topband/2012-12/msg00139.html (13,022 bytes)

18. Re: Topband: one- way propagation (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 4 Dec 2012 21:58:08 -0500
Jose, Interesting paper, I'll have to poor over it some more to digest it. Thanks, Jim, KR9U Here some interesting paper about LF MF polarization http://www.ann-geophys.net/22/1705/2004/angeo-22-1705
/archives//html/Topband/2012-12/msg00149.html (9,233 bytes)

19. Re: Topband: Help with RFI (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sun, 13 Jan 2013 09:23:00 -0500
I would also try shielded CAT-6 cable. It has more turns/foot than CAT-5 and is more immune to EMI, and supports faster speeds. I wrap a few turns of the CAT 5 Ethernet cable coming into the back of
/archives//html/Topband/2013-01/msg00093.html (8,240 bytes)

20. Re: Topband: RDF (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sat, 26 Jan 2013 06:59:02 -0500
David, As I recall, you take the average gain and subtract it from the maximum gain. Or Use 4NEC2, it calculates it for you. Jim, KR9U How do I calculate RDF I am currently modelling the Shared Apex
/archives//html/Topband/2013-01/msg00205.html (7,761 bytes)

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