This is what I did as far as the conduit from the tower to the house and
tower to the shop.
http://www.rogerhalstead.com/ham_files/cablebox.htm
73
Roger (K8RI)
ke2d@comcast.net wrote:
>
> Good afternoon. Finally, the 3rd sunny day in the 50s here in NJ, and time
> to start the antenna work! Hopefully we'll be pouring concrete in another
> week or two for the new tower. Nothing like having a new tower delivered with
> 24" of snow on the ground! Now,......
>
>
>
> I am looking to purchase a few 6m/2m/440 yagis to stack above my HF antennas.
> In my last installation, I used Cushcraft antennas - 13B2 for 144, 719B for
> 440, and A506S for 6m. The VHF/UHF will be vertically polarized, as I work
> more FM simplex than SSB. 6M, however, will be horizontal for SSB DX.
> This time I am now looking at the M2 stuff, namely a 2M12 for 144, a 440-18
> for 440, and a 6M7 for 6m.
>
>
>
> Does anyone have any recommendations of one over the other (Cushcraft vs.
> M2), or recommend any other manufacturers for VHF and UHF yagis?
>
>
>
> Also, I plan to stack a Hy-Gain 7-3 along with a TH-11DX. I was thinking of
> placing the 40m beam above the TH11, as the TH11 has the higher windloading.
> Anyone have any comments on which should be on top (am I correct in placing
> the heavier antenna lower?), and also how much distance I should allow
> between the TH11 and 7-3 40m antenna so as to minimize any potential
> interaction?
>
>
>
> In addition, I need to run grey conduit under ground from the base of the
> tower to where the cables will enter my home. I need to run 9 coax cables,
> and a rotor control line. 10 cables total. Each run will be approx. 210ft.
> 100ft up the tower, then 50ft from the tower to the house, then 50ft along
> the basement and up into the shack, then 10ft or so for movement in the
> shack. Due to the long runs, I was planning on going to LMR600 type cable
> to cut down on the losses, especially at 50MHz and above. I am thinking of
> going with LMR600 right up to the antennas, making sure to oversize the rotor
> loop. I successfully used solid center LMR400 for 10 years, so I might
> gamble this time again. The loss figures for LMR400 keep pushing me that
> direction! Any idea what size conduit I will need if I opt to run 9 runs of
> LMR600 size cable and one rotor cable? I was able to easily get 10 LMR400
> size cables in either 2 or 2.5" conduit (can't recall, as the last tower/qth
> was 10yr
s ago). I stopped at HD and looked at 3" conduit, but damn, that stuff just
looks too darn big, especially when it will be going into the side of my home.
I was planning on entering just above the concrete foundation, where there is
an approx. 8" sill between the concrete and where the first floor rests. Same
as the utilities do.
>
>
>
> One other thing - my plan was to run the conduit from the house out to the
> base of the tower, sink a few 4x4s into the ground near the tower base, then
> mount some sort of grey weatherproof enclosure on them. Have the conduit from
> the house go directly into the bottom of the box, then have another elbow
> come out the bottom, allowing the coax cables to make a drip loop before they
> head up the tower. Inside, I was planning to install a copper plate to which
> I would affix 10 or so Polyphasor arrestors, and the rotor control surge
> arrestor. Then bond the plate and tower to common ground rods near the
> tower. Can anyone recommend a suitable enclosure that will comfortably fit
> 10 or so surge arrestors, plus some room to spare. I took a quick look at the
> DX Eng website, but their stuff only accomodates two or three devices.
>
>
>
> I also need to install an electrical outlet near the base for the tower
> motor. So I will be running a 3/4" conduit as well, from the main panel out
> to the tower base. Any objection to dropping the electrical conduit in the
> same trench as the coax conduit?
>
>
>
> Finally, as far as grounding goes - is there any advantage to installing
> three 8ft ground rods at the bottom of the tower foundation hole BEFORE I
> pour the concrete, and run the ground wires up thru the concrete base, to be
> attached to the tower once it is erect? Or just stick to three ground rods
> into the dirt around the base of the tower foundation after it is done?
>
>
>
> Thanks for your insight and knowledge. I've been learning a lot just reading
> the postings of the last month or two in preparation for this project.
>
>
>
> Eric
>
> K2WD
> _______________________________________________
>
>
>
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