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Total 220 documents matching your query.

101. Topband: Which RX antenna is better? (score: 2)
Author: terry burge <ki7m@comcast.net>
Date: Sun, 28 Jul 2019 21:27:52 -0700 (PDT)
Hi folks, I have four kits purchased on ebay for receive antennas as well as a bi-directional beverage from KD9SV. Looking on my county plot map it looks like I can run about a 412' beverage using my
/archives//html/Topband/2019-07/msg00111.html (7,657 bytes)

102. Re: Topband: capacity needed for Detuning tower (score: 2)
Author: <n4is@n4is.com>
Date: Sat, 22 Dec 2018 09:12:25 -0500
Terry My tower is 116 high , plus 10 ft of mast with a top hat, and the HWF. I never had any problem on 80m because the antenna is too long and near 1/2 wave vertical for 80m, my Vertical WF is 60 ft
/archives//html/Topband/2018-12/msg00220.html (9,698 bytes)

103. Re: Topband: capacity needed for Deturning tower (score: 2)
Author: "John Kaufmann" <john.kaufmann@verizon.net>
Date: Sat, 22 Dec 2018 07:11:59 -0500
On 160 I've used a vertical wire of 20 feet with a 1000 pF variable capacitor to detune a tower at its base. You can scale that to 80. 73, John W1FV Hi again, This may not be possible to answer with
/archives//html/Topband/2018-12/msg00218.html (8,186 bytes)

104. Topband: capacity needed for Deturning tower (score: 2)
Author: terry burge <ki7m@comcast.net>
Date: Fri, 21 Dec 2018 18:22:00 -0800 (PST)
Hi again, This may not be possible to answer with anything like 10% accuracy but can someone give me an idea just how much capacitance I need for putting up a 50-55' vertical wire up the lower half o
/archives//html/Topband/2018-12/msg00217.html (7,271 bytes)

105. Re: Topband: trying to tune up 80 meter 4-Square (score: 2)
Author: Wes Stewart <wes_n7ws@triconet.org>
Date: Fri, 12 Oct 2018 18:21:31 -0700
Joe is correct. On 10/12/2018 5:45 PM, Joe Subich, W4TV wrote: On 2018-10-12 7:10 PM, MrToby wrote: You dont have to lower them but you need to short them to ground to make them electrically invisibl
/archives//html/Topband/2018-10/msg00053.html (10,632 bytes)

106. Re: Topband: trying to tune up 80 meter 4-Square (score: 2)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 12 Oct 2018 20:45:59 -0400
On 2018-10-12 7:10 PM, MrToby wrote: You dont have to lower them but you need to short them to ground to make them electrically invisible No, with 1/4 wave elements you must *open* the feed point - d
/archives//html/Topband/2018-10/msg00052.html (9,681 bytes)

107. Re: Topband: Multiple verticals one feed-point. (score: 2)
Author: "Gary Smith" <Gary@ka1j.com>
Date: Thu, 20 Sep 2018 13:28:57 -0400
Folks, Thanks for the off & on-line replies. There were all positive replies to doing it, nobody mentioned issues with harmonics. All the antennas are in different directions, none run parallel to ea
/archives//html/Topband/2018-09/msg00154.html (7,944 bytes)

108. Topband: OH0Z to W/VE 160m season 2017-18 (score: 2)
Author: Jukka Sirviö <jukka.sirvio@luukku.com>
Date: Wed, 4 Apr 2018 23:24:51 +0300 (EEST)
There were quite a few good openings this season. We took down our E/W slopers just before CQWW CW and replaced them with 2 top loaded phased verticals (vertical height about 30m). The new antenna se
/archives//html/Topband/2018-04/msg00075.html (7,766 bytes)

109. Re: Topband: Demo of the value of one dB (score: 2)
Author: "Ed Sawyer" <sawyered@earthlink.net>
Date: Sat, 27 Feb 2016 12:52:44 -0500
K1DG stated: "A couple of years ago I did a quick analysis and discovered he was right! The control case was N1UR, who operated the CQWW contest many years in the low power category, then turned on a
/archives//html/Topband/2016-02/msg00151.html (8,658 bytes)

110. Re: Topband: KP1 (score: 2)
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Thu, 23 Oct 2014 13:34:16 -0400
Good Luck George....I was the 160 op with the 1969 operation and worked several hundred on TB with a wire suspended above the water on the cliffs protruding across Lulu Bay. I had hopes of hanging sl
/archives//html/Topband/2014-10/msg00131.html (12,675 bytes)

111. Re: Topband: AM broadcast tower and 160m dxpedition (score: 2)
Author: Herb Schoenbohm <herbs@vitelcom.net>
Date: Tue, 10 Jun 2014 12:39:12 -0400
A Delta Loop is probably the least noisy of anything you can hang off an AM tower. I tired both slopers and a Delta Loop here (corner fed) and there and the noise was significantly lower on the Delta
/archives//html/Topband/2014-06/msg00063.html (16,716 bytes)

112. Re: Topband: Suggestions for a tower? (score: 2)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Sat, 26 Apr 2014 08:37:20 -0400
Tom, Let's revisit Jaan's original question: Background: I have a tower that is 137ft. or 42m tall. It is triangular 1ft 10inches or 40cm wide. The tower is guy wired at three levels with non-isolate
/archives//html/Topband/2014-04/msg00070.html (11,920 bytes)

113. Re: Topband: Suggestions for a tower? (score: 2)
Author: <mikefurrey@att.net>
Date: Thu, 24 Apr 2014 11:21:51 -0400
I think I would hang a delta loop off of that tower. It would be very slightly squashed. You would not have to worry about matching the tower or installing a radial system. Through in about a db of g
/archives//html/Topband/2014-04/msg00061.html (11,835 bytes)

114. Re: Topband: Suggestions for a tower? (score: 2)
Author: Ashton Lee <Ashton.R.Lee@hotmail.com>
Date: Wed, 23 Apr 2014 21:51:47 -0600
Or an easy and fairly good approach is to set up a sloper off the tower. The sloper acts as an inverted vertical ( inverted verticals work better than ground fed ones) and uses the grounded tower as
/archives//html/Topband/2014-04/msg00057.html (10,215 bytes)

115. Re: Topband: Fw: AM broadcast tower and 160m dxpedition (score: 2)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Tue, 25 Mar 2014 18:26:08 -0400
Perhaps so - but Dale is gong down there to put in a 240' broadcast tower. 73, Charlie, K4OTV I agree with Herb. Also Haiti is on an earthquake fault. The quarter wave tower would have a better chanc
/archives//html/Topband/2014-02/msg00465.html (9,652 bytes)

116. Topband: Fw: AM broadcast tower and 160m dxpedition (score: 2)
Author: "Bruce" <k1fz@myfairpoint.net>
Date: Wed, 26 Feb 2014 06:18:34 -0500
I agree with Herb. Also Haiti is on an earthquake fault. The quarter wave tower would have a better chance of survival and is safer. 73 Bruce-K1FZ Half wave verticals have been very disappointing to
/archives//html/Topband/2014-02/msg00463.html (8,831 bytes)

117. Re: Topband: AM broadcast tower and 160m dxpedition (score: 2)
Author: Herb Schoenbohm <herbs@vitelcom.net>
Date: Tue, 25 Feb 2014 18:53:35 -0400
Half wave verticals have been very disappointing to me over the years when I had the tall BC towers in my backyard to play with after midnight on 160. I have had much better result in hanging 1/2 wav
/archives//html/Topband/2014-02/msg00462.html (11,791 bytes)

118. Topband: 160M and 75M TX antennas (score: 2)
Author: K4LCD <k4lcd@bellsouth.net>
Date: Sun, 03 Nov 2013 17:12:35 -0500
Hi all! Been a member of the list for years. RX antennas are four elevated EWEs rotatable from a switch in my shack. I am contemplating replacing Alpha Delta DXA slopers, hanging from the top tolt of
/archives//html/Topband/2013-11/msg00098.html (6,643 bytes)

119. Re: Topband: Dual band shunt-feeding tower on 160/80 (score: 2)
Author: Herb Schoenbohm <herbs@vitelcom.net>
Date: Mon, 26 Aug 2013 15:11:57 -0400
The interaction of a grounded steel tower, I have found, can be minimized somewhat by having the end of the 80 meter antenna more than 25' away from the structure and supported with non conducting ma
/archives//html/Topband/2013-08/msg00339.html (10,319 bytes)

120. Re: Topband: Dual band shunt-feeding tower on 160/80 (score: 2)
Author: "Lennart M" <lennart.michaelsson@telia.com>
Date: Mon, 26 Aug 2013 21:03:54 +0200
Interesting. I have tried verticals, slopers, inverted V's and other 80 meter antennas on or near my 160 meter tower with little success. The impedance of any such antenna seems to be severely altere
/archives//html/Topband/2013-08/msg00338.html (9,112 bytes)


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