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Total 34 documents matching your query.

1. Re: Topband: Polarity and Phase (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 14 Apr 2004 19:06:41 -0500
If the receivers are tuned to different frequencies, the resulting audio signals are of different frequencies, and phase has no meaning! Phase is only defined for sine waves of the same frequency! Ac
/archives//html/Topband/2004-04/msg00090.html (12,831 bytes)

2. Re: Topband: Polarity and Phase (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Thu, 15 Apr 2004 08:00:01 -0500
At 06:09 AM 4/15/2004, john battin wrote: It requires a time delay of about 1ms to take two 500hz. tones from being in phase to being out of phase. I can see no way that adding 180 degrees of feedlin
/archives//html/Topband/2004-04/msg00099.html (9,055 bytes)

3. Re: Topband: Repairing beverage coax lead-in (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Sun, 12 Sep 2004 08:55:17 -0500
A good alternative to encasing the feedline in PVC pipe or hose is to scrounge up some hardline. I've never had any problems with rodents chewing that, and it's tough enough that a horse can walk ove
/archives//html/Topband/2004-09/msg00071.html (8,333 bytes)

4. RE: Topband: Re: Coax capacitor losses (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Mon, 20 Dec 2004 07:54:13 -0600
Whenever I have needed a capacitor in a hurry, such as on a DXpedition or during a contest I have used coaxial cable. If the amount of capacitance is very high, say, a few hundred pF, then I use a nu
/archives//html/Topband/2004-12/msg00268.html (8,639 bytes)

5. Re: Topband: What percentage of the length ... (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 19 Jan 2005 20:35:27 -0600
At 06:16 PM 1/19/2005, W5USM@aol.com wrote: ... of a wooden utility pole is recommended to be in the soil? Bill, The rule of thumb used in the utility industry for average soil is 10% of the height p
/archives//html/Topband/2005-01/msg00255.html (7,039 bytes)

6. Re: Topband: What percentage of the length ... (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Thu, 20 Jan 2005 10:31:36 -0600
BTW 10% plus two feet is the recommendation of the Lineman's and Cableman's Handbook, 7th edition, by Edwin B. Kurtz and Thomas M. Shoemaker, page 11-3, both in the text and in Table 11-1. Sorry I di
/archives//html/Topband/2005-01/msg00263.html (7,517 bytes)

7. Re: Topband: What percentage of the length ... (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Thu, 20 Jan 2005 17:07:31 -0600
Not sure I like that last bit. What exactly does "significantly less" mean? I've planted a few 28 foot poles and wouldn't consider anything less than 4.5 feet depth particularly if I'm going to be sw
/archives//html/Topband/2005-01/msg00268.html (10,782 bytes)

8. Topband: 160 AM BCB filter (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>(by way of Bill Tippett<btippett@alum.mit.edu>)
Date: Sat, 20 Aug 2005 11:19:52 -0400
Nice filter for AM (1700 KHz) station reduction. http://www.dallas.net/~jvpoll/Filter/TheAMBrickWall.html _______________________________________________ Topband mailing list Topband@contesting.com h
/archives//html/Topband/2005-08/msg00037.html (6,866 bytes)

9. Re: Topband: 160 AM BCB filter (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Sat, 20 Aug 2005 14:23:21 -0500
It is a very mysterious site. And he never mentions his call or says much about who he is. Yet the work looks pretty good. I sent off an email inquiring about the details such as the schematic. We'll
/archives//html/Topband/2005-08/msg00045.html (7,687 bytes)

10. Re: Topband: 160 AM BCB filter (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Sat, 20 Aug 2005 22:18:20 -0500
Barry, I THINK that the NQN filter in the referenced info was for the 100 watt BANDPASS one that was part of the six-band set in QST and available from Array Solutions. But NQN also had a HIGHPASS fi
/archives//html/Topband/2005-08/msg00053.html (8,720 bytes)

11. Topband: Laport "Radio Antenna Engineering" -- Deal of the Millenium (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 28 Sep 2005 21:54:22 -0500
I have often been asked where to get a copy of Laport's Radio Antenna Engineering. A classic antenna book, published in 1952 by McGraw-Hill. Edmund Laport was chief engineer of RCA's international di
/archives//html/Topband/2005-09/msg00092.html (7,473 bytes)

12. Re: Topband: Engineering ?? @ relays (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 19 Oct 2005 07:23:59 -0500
Ford-- We once had a similar problem with all of the Dow-Key coax relays used in our radio astronomy observatory. These were the standard T-shaped relays with gold contacts. We would use a thin strip
/archives//html/Topband/2005-10/msg00146.html (11,618 bytes)

13. Re: Topband: Moonlight & K-sums (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 19 Oct 2005 18:05:39 -0500
Here is a thought. The phase of the moon has an effect on the ocean tides. There are also tides in the atmosphere as well as atmospheric waves. Structure and motion could affect local electron densi
/archives//html/Topband/2005-10/msg00159.html (8,130 bytes)

14. Re: Topband: Moonlight & K-sums (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 19 Oct 2005 20:27:57 -0500
I'd just quibble with you on your assertion of "near-zero" gravity. Not true at all. Astronauts are "weightless" because they are falling with an acceleration equal to the acceleration of gravity. Th
/archives//html/Topband/2005-10/msg00163.html (10,544 bytes)

15. Re: Topband: Radial length responses (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Tue, 25 Oct 2005 11:02:51 -0500
BTW, Pete-- I disagree with your summation about adversely affecting the radiation angle when making an adjustment to the radials that is relatively small. Also see the work done by K5IU, published i
/archives//html/Topband/2005-10/msg00289.html (9,986 bytes)

16. Topband: Classic Beverage Paper Redux (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Sun, 11 Dec 2005 09:37:36 -0600
The following classic has been retyped for easier reading. --John W0UN Memorandum on the Beverage Wave Antenna for Reception of Frequencies in the 550 - 1500 Kilocycle Band By Benjamin Wolf and Adolp
/archives//html/Topband/2005-12/msg00147.html (7,092 bytes)

17. Re: Topband: Relays in RX array (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 22 Mar 2006 07:06:10 -0600
Actually, Ford, the SUBJECT line of Pete's message says it all! Look at the subject in the email you just sent! ;-) RX array it is. QRO needs no additional current to keep the contacts clean on the
/archives//html/Topband/2006-03/msg00151.html (10,283 bytes)

18. Topband: Preamp info wanted (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Sun, 18 Jun 2006 09:15:24 -0500
I ran across an old preamp in my junk box and I am trying to find the source of the design, so I can modify it for AM BC DX. It has an MPF102 JFET first stage and an MC1350 8-pin DIP IF amp chip seco
/archives//html/Topband/2006-06/msg00019.html (7,354 bytes)

19. Re: Topband: Base Insulators for Verticals (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Sun, 10 Sep 2006 08:39:27 -0500
OPTIONS While I can't argue with the logic expressed here concerning ceramic insulators, I must point out that they were designed during a time when there weren't many choices for materials and for a
/archives//html/Topband/2006-09/msg00016.html (9,451 bytes)

20. Re: Topband: Tripplite power outlet OPTION (score: 1)
Author: W&Oslash;UN -- John Brosnahan <shr@swtexas.net>
Date: Tue, 05 Dec 2006 16:32:06 -0600
Even Better Option for $20 from Sams Club. Here is the surge protection that I like. Double the joule rating. And an RFI rating. Plus its a 12-outlet strip that includes telephone and coax protectio
/archives//html/Topband/2006-12/msg00067.html (8,130 bytes)

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