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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+160\s+Tower\s+on\s+80\s*$/: 11 ]

Total 11 documents matching your query.

1. Topband: 160 Tower on 80 (score: 1)
Author: Glenn Biggerstaff <ww4b73@gmail.com>
Date: Sat, 28 Feb 2015 20:15:42 -0500
Hi all, I have a 90 foot Rohn 25 tower with an insulated base and insulated guy wire sections for top loading ,base fed for 160 meters. It work great ,but I would like to use it on 80 meters as well.
/archives//html/Topband/2015-02/msg00778.html (7,104 bytes)

2. Re: Topband: 160 Tower on 80 (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Sat, 28 Feb 2015 22:13:26 -0500
Well, Glenn, I would lean toward voltage-feed at the base, since you have that insulated tower! Because of the lower current, the ground-losses would be minimized, and the current maximum would be fa
/archives//html/Topband/2015-02/msg00781.html (9,841 bytes)

3. Re: Topband: 160 Tower on 80 (score: 1)
Author: "KL7RA" <kl7ra@ptialaska.net>
Date: Sat, 28 Feb 2015 18:52:42 -0900
Hi Glenn, all of Charlie's, K4OTV ideas work of course but you did mention alternate ideas. I also have a Rohn 25 insulated base tower that is 142 feet to the top of the stinger that I use for 160.
/archives//html/Topband/2015-02/msg00783.html (11,666 bytes)

4. Re: Topband: 160 Tower on 80 (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sat, 28 Feb 2015 20:14:49 -0800
On 2/28/2015 5:15 PM, Glenn Biggerstaff wrote: Hi all, I have a 90 foot Rohn 25 tower with an insulated base and insulated guy wire sections for top loading ,base fed for 160 meters. It work great ,b
/archives//html/Topband/2015-02/msg00785.html (9,054 bytes)

5. Re: Topband: 160 Tower on 80 (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Sat, 28 Feb 2015 23:42:34 -0500
Hi, Glenn There's a lot to be said for Rich's approach if you can manage the additional tower. It does need to be well separated from the 160 tower as some interaction is likely. You might want to do
/archives//html/Topband/2015-02/msg00786.html (14,048 bytes)

6. Re: Topband: 160 Tower on 80 (score: 1)
Author: Herbert Schoenbohm <herbs@vitelcom.net>
Date: Sun, 01 Mar 2015 03:10:31 -0400
Glenn, If the tower as is, with the top loading on 160 causing it to be long for 80 meters for an easy feed, you can make a simple decoupling sleeve skirt and feed the tower with a gamma rod on 80 me
/archives//html/Topband/2015-03/msg00001.html (9,770 bytes)

7. Re: Topband: 160 Tower on 80 (score: 1)
Author: donovanf@starpower.net
Date: Sun, 1 Mar 2015 02:16:40 -0500 (EST)
Hi Glenn, You should be very worried about voltage breakdown of your base insulator! Do you know how much RF voltage your base insulator can safely handle? A fourth idea you might consider is to simp
/archives//html/Topband/2015-03/msg00002.html (9,015 bytes)

8. Re: Topband: 160 Tower on 80 (score: 1)
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sun, 01 Mar 2015 03:36:07 -0400
In this case a three or four wire cage with 36 inch spreaders cut for 80 meters might be the easiest solution for you and allow for feeding at ground level. However the impact of the tower might resu
/archives//html/Topband/2015-03/msg00003.html (7,229 bytes)

9. Re: Topband: 160 Tower on 80 (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Sun, 1 Mar 2015 11:01:18 -0500
Hi all, I have a 90 foot Rohn 25 tower with an insulated base and insulated guy wire sections for top loading ,base fed for 160 meters. It work great ,but I would like to use it on 80 meters as well.
/archives//html/Topband/2015-03/msg00011.html (9,706 bytes)

10. Re: Topband: 160 Tower on 80 (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Sun, 01 Mar 2015 11:22:44 -0500
Agreed. I have found it very difficult to model accurate complex base Z measurements of wide broadcast towers (i.e., low height/diam. ratio) that are of the 180-195 degree variety - even with NEC4.2
/archives//html/Topband/2015-03/msg00012.html (7,811 bytes)

11. Re: Topband: 160 Tower on 80 (score: 1)
Author: <n0tt1@juno.com>
Date: Sun, 1 Mar 2015 16:21:50 +0000
FWIW, I did that with my 160 tower. It works, but when the wind blows the 80m antenna gets detuned. The spacing is about 18" and the 80m wire is under tension. 160m operation is unaffected. I had th
/archives//html/Topband/2015-03/msg00013.html (7,808 bytes)

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