Condition? Age? Assembled or disassembled? Price?
Bill W2WHC
Paige, TX
*From:*BVARC <[email protected]> *On Behalf Of *Bob H via BVARC
*Sent:* Thursday, May 26, 2022 9:29 AM
*To:* [email protected]
*Cc:* Bob H <[email protected]>
*Subject:* Re: [BVARC] Beam antenna for sale
I bought a Force 12 beam, for 40M, 20M, 15M and 10M from a fellow
TDXS ham when he left Houston area. It has been in my garage ever
since... a few years.
Anyone interested in buying it let me know via email first....
Have a great day.
Bob Hardie W5UQ Magnolia, TX
Bob H. W5UQ.com
On 5/25/2022 2:17 PM, Gus Bernard via BVARC wrote:
Attached see the Motorola R65 manual I think Robert is referring
to. I don't know if there's a newer version.
BTW, salt ( with moisture) works well to improve ground rod
conductivity if you can get it down the hole. But as Robert
says, it kills grass and won't last forever.
Gus K5GMB
On Wed, May 25, 2022 at 11:19 AM Robert Polinski via BVARC
<[email protected]> wrote:
John, Hubbell & Nvent-Erico both make threaded ground rods. I
think both need a threaded coupling for both. Chemical
grounds work but are seldom used around here, they become
less effective over time, and need care to install as most
use a sodium based chemical the corrosion factor is high,
also no grass will grow around the rod for years. The
practice here and in most locals is to use multiple rods
6-10ft apart. That is the practice at most all cell phone
sites. Motorola published a grounding guide for
communications sites, deals with best practices in grounding
and lightning protection. Do not recall the publication # but
it is online It is Standards and Guidelines for Communication
Sites. Due note the book is 500+ pages long. Not easy
reading, but a good guide. Your sandy soil is great for
pushing in ground rods by hand, that type of soil is what
N5XZ had at his tower site & we pushed in 4 or 5 at his tower
base. Sandy soil is fairly conductive when damp but less so
as it dries out (keep the water hose handy) Robert
*From:* BVARC <[email protected]> *On Behalf Of *john
Parmalee via BVARC
*Sent:* Wednesday, May 25, 2022 9:14 AM
*To:* [email protected]
*Cc:* john Parmalee <[email protected]>
*Subject:* Re: [BVARC] grounding
Robert, thanks for your comments. I will check Elliott for
screw together g rods the next time I am in town. I live in
far southwest Montgomery county, We don't have gumbo here but
sandy loam. When I put my last g rod in I used a section of
PVC connected to a garden hose to wash six or so feet into
the ground then a sledge,
One thing that has not been mentioned is chemical grounds. I
recall trying to make a 35 mHz paging system work. One thing
we did was to install chemical grounds on all the towers
involved. That didn't work, the frequency sees a modern
office building a as a wave guide below cut off and just
doesn't penetrate,
I have read stories about trying to get a good ground while
building across the desert power transmission lines.
John Parmalee
[email protected]
281-380-3811
K5VGM WI2XLJ
In a message dated 5/25/2022 7:13:24 AM Central Standard
Time, [email protected] writes:
Robert,
At my installation the only one I am really concerned
about is the ground for the DSL into my house (NOT
installed by myself) that is a pipe, not a rod. I
clamped a ground wire to a sanded portion of the pipe,
and bonded it to my station ground, but I think the pipe
thing is a real bad idea. Given that it is an AT&T
thing, do you have any suggestions other than what I have
done?
Ron
Sent from Mail
<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
*From: *Robert Polinski via BVARC <mailto:[email protected]>
*Sent: *Tuesday, May 24, 2022 8:29 PM
*To: *john Parmalee <mailto:[email protected]>; BRAZOS
VALLEY AMATEUR RADIO CLUB <mailto:[email protected]>
*Cc: *Robert Polinski <mailto:[email protected]>
*Subject: *Re: [BVARC] grounding
John, they do make thread together rods, when I did
commercial communications I have used them at comm sites.
Here, a 10ft ground rod is fine as are wet gumbo soil
makes a pretty good ground. The NEC requires 2 ground
rods or a ground rod and a ufer ground, which can be
rebar in the slab, metal water line or metal bldg. if in
contact with the earth via rebar or poles. I usually
install 2 rods. Most 10 ft ground are easy to push in the
ground with just your hands. I just a few weeks ago
installed additional rods at a hams house in the Heights.
I wired a home in Elgin, just outside of Austin. Had to
install horizonal ground rods as the ground was solid
rock 2 ft down. I always tie to an existing rod but
always add an additional rod as you never know if the old
ground rod is 10ft or 18” Here in the Houston area,
testing is not necessary because of the soil, but as the
video shows, it is a neat test. You are correct in your
bends in the grounding conductor, they will act as a
choke if made sharp, also, you should no run the ground
wire in metal conduit for the same reason unless you bond
the ground wire to the conduit at both ends. As far a
lightning goes, remember, all the wiring the strike
travels thru on the way to the earth has resistance &
inductance, so by the time it gets in the circuit the
voltage & current are greatly reduced, still high, but
since the duration is short, a good grounding system will
dissipate quickly. Robert
*From:* BVARC <[email protected]> *On Behalf Of
*john Parmalee via BVARC
*Sent:* Tuesday, May 24, 2022 6:31 PM
*To:* [email protected]
*Cc:* john Parmalee <[email protected]>
*Subject:* Re: [BVARC] grounding
From what the great video says, if you are comfortable
working with 120V the simplest way to check out a ground
rod is to see how much current it will draw and do the
math. Don't attempt this without experience working with
a live circuit. I have been told by licensed
/electricians/that when a new service is turned up if
there is the stub of a ground rod sticking out of the
ground it is good. No testing required.
The thing I don't know is where to get the ground rod to
ground rod connections and the ground rods with the blunt
ends so they can match the previously driven rod. Lowes
only carries the 8 or it 10-foot rods and the coupling to
the flex wire to the service box. I checked Amazon and
found nothing. I am told the local rental yard will rent
a hammer drill and the ground rod driving adapter.
Another comment regarding the ability of a ground to
carry a lightning strike. All bends of the ground wire
should have the gentlest bends possible. A strike of
lightning is a very fast rise time having many
harmonics. We know this because we can hear lightning
almost to the VHF bands, A bend will look like an
inductor and raise the instant ohmic value of a ground
rod. On the other hand, a few turns on a coax or power
source lead will increase the ohms to you rig.it
<http://rig.it> will not protect against a direct hit but
might fend off some induced current from a nearby strike.
In south Florida it is common to tie several knots in
your modem phone line. In Michigan they wrap a phone
line around a ¼” bolt , some washers and a nut..
John Parmalee
[email protected]
281-380-3811
K5VGM WI2XLJ
In a message dated 5/23/2022 7:54:42 PM Central Standard
Time, [email protected] writes:
If any one is interested in ground rod resistance,
you can watch the link below. One thing I want
watchers to note, they have 2 50ft ground rods
connected together, they hook the hot side of a 120v
ckt to them and it only pulls 13 amps (not enough to
trip a breaker), that is why the grounding system
must have a bond back to the power co ground always.
Note this is not related to the RF grounds used as a
counterpoise to an antenna system other than they
will be tied together at a point. Robert
https://www.youtube.com/watch?v=Yg6G5VUSsWA
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