Try "Reply to all". works for me (Outlook)
73s de Jim
W5IFP
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com]On Behalf Of Marlon K. Schafer
> (509-982-2181)
> Sent: Thursday, June 28, 2012 10:35 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Fw: Coax, conduit and toroids
>
>
> UG! I sure wish this list responded to the list vs. the sender.
>
> Resending the below, to the right place this time....
> marlon
>
>
> ----- Original Message -----
> From: "Marlon K. Schafer (509-982-2181)" <ooe@odessaoffice.com>
> To: "K8RI" <K8RI-on-TowerTalk@tm.net>
> Sent: Thursday, June 28, 2012 8:19 AM
> Subject: Re: [TowerTalk] Coax, conduit and toroids
>
>
> > According to Timesmicrowave the LMR 600 cable has a bend radius of 6".
> >
> >
> http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&;
> cd=2&ved=0CGMQFjAB&url=http%3A%2F%2Fwww.timesmicrowave.com%2Fpro
> ducts%2Flmr%2Fdownloads%2F28-31.pdf&ei=K3XsT_nxFIXKqgHH5pjVBQ&us
> g=AFQjCNFPxXUVsHTlB1c558cLq3U2F9gvIQ&sig2=rXQk7FCCNeaaM1wS5LrmIA
> >
> > I think LMR 400 is 2 or 3". I'd not be worried about using standard
> > sweeps for the turns.
> >
> > Where it may get a bit tougher would be if you tried to use
> an LB to enter
> > a building. Might need to look at a really big one or some other
> > mechanism.
> >
> > marlon
> >
> > ----- Original Message -----
> > From: "K8RI" <K8RI-on-TowerTalk@tm.net>
> > To: <towertalk@contesting.com>
> > Sent: Tuesday, June 26, 2012 5:57 PM
> > Subject: Re: [TowerTalk] Coax, conduit and toroids
> >
> >
> >> On 6/26/2012 8:30 PM, Rick Kiessig wrote:
> >>> I'm interested in suggestions for how to best segment the
> coax running
> >>> between my shack and tower-mounted antenna. I'm thinking of
> something
> >>> like
> >>> this: (1) from shack to the base of the tower through
> conduit, tied to
> >>> ground rod via lightning protector, (2) up the tower, (3)
> from the top
> >>> of
> >>> the tower to the antenna, tied to #2 using a barrel connector and
> >>> wrapped
> >>> with weatherproof tape. The runs are fairly short, roughly
> 20m from the
> >>> shack to the base of the tower and 10m up the tower. Have I missed
> >>> anything?
> >>
> >> Grounding to the tower at the top and bottom is a good idea.
> >>
> >>>
> >>>
> >>>
> >>> I'm thinking of using LMR-600 for the first two segments
> (seems easier
> >>> to
> >>> handle than Heliax),
> >>
> >> It is, but unless you are running QRO and/or UHF it's quite a bit of
> >> overkill.
> >>
> >>> and LMR-400UF for #3,
> >>
> >> From personal experience with both LMR 400 and 600 UF the UF versions
> >> do not stand up well out in the elements.
> >> I use Davis BuryFlex(TM). It's almost as flexible as the UF
> cables and a
> >> lot more durable.
> >>
> >>> with UHF-style connectors for
> >>
> >> UHF connectors are difficult to find for LMR-600. Davis was the only
> >> company I found who would get them for me. They were a clamp type.
> >> Using UHF connectors and UF cable I'm going to assume you are talking
> >> about feeding a tribander or something similar.
> >>
> >>> each. For my current setup, I ground the coax before it enters the
> >>> shack.
> >>> The new tower will be right next to the house, so the tower
> ground and
> >>> the
> >>> before-entering-the-shack ground will be the same thing.
> >>>
> >>>
> >>>
> >>> What should I do to help ensure that the inside of the
> conduit stays
> >>> dry? Is
> >>> applying some sort of weatherproof sealing compound to each
> end enough?
> >>>
> >>>
> >>
> >> It's probably impossible to insure it'll stay dry, but a good start
> >> would be http://www.rogerhalstead.com/ham_files/cablebox.htm
> >> It's how I run the coax from both the shop and house to the
> tower. Check
> >> the 3rd and 4th photos from the top and the bottom two rows. This
> >> presents a good way to terminate the coax out of the weather
> as well as
> >> entering the house without damaging concrete. I really don't worry
> >> about the conduit staying dry inside unless I have
> connectors some where
> >> inside the stuff. IIRC I included an explanation of what I
> did as well.
> >>
> >>
> >>>
> >>> I'm planning two coax runs and two control cable runs, in
> two separate
> >>> conduits, coax in one, control in the other. What's a reasonable
> >>> diameter
> >>> and turning radius for the conduit? The Times Microwave
> >>> specifications/limits are one thing, but I also want to do
> what I can to
> >>> ease/simplify the process of pulling the coax through the
> conduit once
> >>> it
> >>> gets installed.
> >>
> >> Use lots of cable pulling soap! Note the last photo in the
> above link.
> >> I also used two sweep 45s in place of a single 90.
> >> Size wise make the conduit large enough to hold at least
> twice as much
> >> as you plan on putting in. That's for ease of pulling and unexpected
> >> future events.
> >> Also, don't forget to install a pull cable.
> >>
> >>>
> >>>
> >>>
> >>> Are there any precautions I should take with regard to
> running the coax
> >>> or
> >>> control lines near existing electrical wiring for the
> house? I'm trying
> >>> to
> >>> avoid proximity as much as I can, but I'm wondering how far
> I should go.
> >>>
> >>
> >> I'd keep them at least 3 to 5 feet apart if possible. Farther in very
> >> dry conditions, but often we have to make do with what we have. I
> >> actually have my control wiring and coax in the same conduits.
> >>
> >>>
> >>>
> >>> Is it a good idea to create a coil of coax in or near the
> base of the
> >>> tower,
> >>> run through ferrite toroids? I do this at the base of my
> vertical, but
> >>> I'm
> >>> not sure if it's as useful for a horizontal antenna.
> >>
> >> I have a one of these current chokes/baluns on each of my sloping
> >> dipoles. On 75 I still had so much feedback that all the LEDs in the
> >> shack would light by the time I reached a KW out let alone 1.5 KW. I
> >> added a second choke in the 75 meter feed line at the tower and it
> >> cleaned it up to where I can not detect any common mode
> voltage making
> >> it back to the shack. If you need one, use one, if you
> don't then save
> >> your money.
> >>> I am planning to
> >>> continue to use toroids at the shack end of the cable.
> Should I also run
> >>> the
> >>> antenna and rotator control cables through toroids at both ends?
> >>
> >> 73
> >>
> >> Roger (K8RI)
> >>
> >>
> >>
> >> _______________________________________________
> >>
> >>
> >>
> >> _______________________________________________
> >> TowerTalk mailing list
> >> TowerTalk@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
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