[TowerTalk] Cut off extra 7 ft of mast or leave it?

[Grant Saviers]

My DB36 has significant interaction on 30 and 40m with an 80m dipole 12' 
above it.  Reduced with the dipole aligned with the DB boom.  IMO, the 
trombone loading is pretty sensitive to other antennas, but I haven't 
modeled it.

Grant KZ1W

On 11/23/2020 06:18, David Winarsky wrote:
> Thanks everyone for all the great comments and advice!  It sounds like a lot of people have a similar setup and are actually utilizing the extra space space.  I wasn’t sure the extra length of mast would be stable enough to hold another antenna on its own, but based on this thread I’ll plan to put a 3 feet of the mast in the tower (with the rotator plate 3 ft down as Karl advised), put the Steppir a few feet above the top of the tower, and the JK40 all the way at the top.
> 
> By the way, one additional question I forgot to ask— I had been advised to rotate the JK40 90 degrees from the Steppir to avoid interaction between the two antennas.  Do you folks advise the same?
> 
> Thanks again,
> David K6ZD
> 
>> On Nov 22, 2020, at 21:51, Dick Williams <richardk8ztt at gmail.com> wrote:
>>
>> 
>> Dave,
>>
>> If you are not planning on stacking another antenna on the tower, why not move the 40M dipole up higher and utilize the additional 7 ft to get the 40M rotatable dipole a bit higher up?  That tower seems to have similar specs to my old US Tower HDX-54 that I have had up close to 20 years.  Like yourself, I have a 20 ft mast and the rotor (Tailtwister) is mounted in the tower with 3 or so feet of mast in the tower.  I use the tower to hold two Force 12 Magnum antennas.  One is a 7 element 12 M beam about 1 ft above the top of the tower, and the other is an 8 element 10 M beam about 3 ft from the top of the mast (the U Bolt and saddle that holds the truss cable for the 10M beam is at the top of the mast).  I live on top of a hill, and have had winds in excess of 70 MPH on more than one occasion.
>>
>> Have fun erecting the tower.  For the first time since I erect it, I had to do some maintenance last week, and it was sure nice to be able to lower it down!
>>
>> Dick, K8ZTT
>>
>>> On Sun, Nov 22, 2020 at 9:38 PM Gary K9GS <k9gs at gjschwartz.com> wrote:
>>> I'd have to study this a bit more but why not put a 3 ele 6m beam at the top and stack with the DB11 on 6m?73,Gary K9GS
>>> -------- Original message --------From: Raymond Benny <rayn6vr at gmail.com> Date: 11/22/20  10:23 PM  (GMT-06:00) To: wesattaway at bellsouth.net Cc: Tower Talk <TowerTalk at contesting.com>, David Winarsky <david at winarsky.com> Subject: Re: [TowerTalk] Cut off extra 7 ft of mast or leave it? You paid big bucks for a good mast. 7ft sticking up won't hurt a thing.Besides, you may want to add another antenna in the future.Ray,N6VR/W7YAOn Sun, Nov 22, 2020, 7:56 PM Wes Attaway <wesattaway at bellsouth.net> wrote:> I would leave it in place because someday you might want to put a vertical> up there.>>      ----------------------------------->       Wes Attaway (N5WA)> (318) 393-3289 - Shreveport, LA> Computer/Cellphone Forensics>       AttawayForensics.com>      -----------------------------------> -----Original Message-----> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of> David> Winarsky> Sent: Sunday, November 22, 2020 8:39 PM> To: TowerTalk at contesting.com> Subject: [TowerTalk] Cut off extra 7 ft of mast or leave it?>> I'm putting up my first tower, a LM-354HDSP with a Steppir DB11 and a JK 40> meter horizontal dipole, both in the same mast. I have a 20 ft 2 in OD mast> from Tashjian and am wondering whether I should cut off the unused length> or> leave it?>> Karl at Tashjian suggested I install the rotator plate 3 ft below the top> of> the tower and the DB11 2 ft above the top, with the JK40 8 ft above that> (10> ft from the top of the tower). That will leave 7 ft of the mast unused.>> Do you folks recommend I leave the extra 7ft of the mast in place or cut it> off?>> Appreciate the input and any other comments or suggestions on my plan.>> 73,> David K6ZD> _______________________________________________>>>> _______________________________________________> TowerTalk mailing list> TowerTalk at contesting.com> http://lists.contesting.com/mailman/listinfo/towertalk>> _______________________________________________>>>> _______________________________________________> TowerTalk mailing list> TowerTalk at contesting.com> http://lists.contesting.com/mailman/listinfo/towertalk>______________________________________________________________________________________________TowerTalk mailing listTowerTalk at contesting.comhttp://lists.contesting.com/mailman/listinfo/towertalk
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