Gentlemen:
Thanks for all the responses. I will respond individually to messages sent to
my gmail account. The suggestion to re-locate made me laugh. (no offense, let
me explain)
Haiti is another world, and cannot be easily understood. Most land is not for
sale. But the big thing is that a
Depends on the noise at your location, before I removed the 300 ft
towers
here I matched one for 160 and ran low power in the Stew Perry a few years
ago, ended up number 1 world wide if memory is correct, and receive was
only the xmt antenna at that time.
If the locations noise is low you wil
On 2/25/2014 6:16 PM, Merv Schweigert wrote:
If the locations noise is low you will hear everything thats on the band.
Merv K9FD/KH6
Of course. I didn't mean to imply otherwise. But in today's world, it is
not safe to assume that any given location will be quiet. I've been to
mountain tops t
Depends on the noise at your location, before I removed the 300 ft towers
here I matched one for 160 and ran low power in the Stew Perry a few years
ago, ended up number 1 world wide if memory is correct, and receive was
only the xmt antenna at that time.
If the locations noise is low you will
I thought a bit more about this… while a beachfront/salt marsh location might
be ideal for building an international broadcast facility, if you were building
a station for domestic Haitian audiences you would probably prefer a high
location reasonably far from the sea and its corrosive effects.
Make them shorter and they will often do well over tidal marshes but not
over open water.
For a 240' tower Id suggest gamma feeding it up at the 1/4 wave point and
use 4 elevated radials. It the AM BCB radials are installed they will make
an excellent ground screen but do not connect them to t
Half wave verticals have been very disappointing to me over the years when
I had the tall BC towers in my backyard to play with after midnight on
160.
I installed a 318 ft insulated base tower in stages and watched the results.
I felt there was very little difference from 1/4 wave up to about
The two latter products produce superb plotting results when sweeping
through the AMBC frequencies in the presence of strong RF fields - Paul
Yes Paul, we have a couple of ways to handle rf on the antenna, one is the
way we make the measurement which surrounds the measurement with a band
pass fil
Perhaps so - but Dale is gong down there to put in a 240' broadcast tower.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Bruce
Sent: Wednesday, February 26, 2014 6:19 AM
To: topband@contesting.com
Subject: Topband: Fw: AM broadc
That's not so surprising Gary !! te Way the Beverages and similar slow-wave
antennas work is that they depend on the lossy GND underneath for their
operation, so a salt marsh would not be a very beneficial GND structure
under a Beverage!
73,
Charlie, K4OTV
-Original Message-
From: Topba
I agree with Herb. Also Haiti is on an earthquake fault. The quarter
wave tower would have a better chance of survival and is safer.
73
Bruce-K1FZ
- Original Message -
From: "Herb Schoenbohm"
To:
Sent: Tuesday, February 25, 2014 5:53 PM
Subject: Re: Topband: AM broadcast tower
Half wave verticals have been very disappointing to me over the years
when I had the tall BC towers in my backyard to play with after midnight
on 160. I have had much better result in hanging 1/2 wave center fed
slopers of of high towers. Radio stations seem to prefer if they have
extermely hi
My Inv-L is on a salt marsh on Long Island Sound in Connecticut & I
ran two bidirectional 860' beverages over the salt marsh. I had
terrible results with the beverages, very noisy and hardly any
improvement over the Inv-L, much of the time the Inv-L was more
effective on Rx. With that, my exper
On 3/25/2014 4:45 PM, Charlie Cunningham wrote:
Well, he's talking about going in November - maybe in time for CQWW
CW -but probably not.
Sorry, Charlie - his post said:
2. In December of this year, I am organizing a small group to go to
Haiti and participate in the 160m contest. (this of c
On 2/25/2014 12:38 PM, Richard Karlquist wrote:
In the past, I have seen some of these AM tower efforts
ruined by lousy receive conditions.
YES! I had exactly that experience nearly 30 years ago loading a quarter
wave tower near Chicago for 860 kHz. Couldn't hear a thing.
73, Jim K9YC
_
Well, he's talking about going in November - maybe in time for CQWW CW -but
probably not.
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Joe
Subich, W4TV
Sent: Tuesday, February 25, 2014 4:10 PM
To: topband@contesting.com
Subject: Re: Topband: AM broa
Good point!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Ashton
Lee
Sent: Tuesday, February 25, 2014 4:03 PM
To: DALE LONG
Cc: topband@contesting.com
Subject: Re: Topband: AM broadcast tower and 160m dxpedition
I would be especially mindful of corr
I recently did almost this same project in Tortola, BVI (VP2V) 4 weeks ago.
I have been helping as a consultant to ZBVI for the past 20 years.
I was part of the team that installed a new 300 ft tower for ZBVI when the
old tower came down due to an accident with a guy wire.
The station goes off th
> Others can comment on whether 240 feet is too high.
240 feet tuned/matched with a parallel tuned tapped tank should
work quite well based on the information in K3LC's article in QEX
Nov/Dec 2013. Of course, 240 feet would also make an excellent
support for a wire 4 square or parasitic array
I would be especially mindful of corrosion issues in tower planning in the
Caribbean. There was a recent article in the Contest Journal on the ever
difficult tower corrosion experienced at PJ2T.
On Feb 25, 2014, at 1:17 PM, DALE LONG wrote:
> Gentlemen:
>
> I have been reluctant to ask for
No, I don't believe 240' is too high - especially if the tower has a base
insulator! It would be so close to 1/2 wave on 160, that it could be fed
very well as a 1/2 wave radiator on 160, either via a parallel tuned tank or
a 1/4 wave of perhaps 450 oh ladder line. A 1/2 wave radiator wis an
excel
Congratulations on your adventure.
In the past, I have seen some of these AM tower efforts
ruined by lousy receive conditions. I suggest you
get an advance team out to the site to check
out the noise level etc. and maybe put up some
temporary beverages, loops, whatever and LISTEN
on them. Use W
Gentlemen:
I have been reluctant to ask for help which did not relate directly to our
reflector. But today I got up my courage, so here goes. I have been invited to
lead a group of amateurs to help build an AM tower in Haiti.
Two things that may relate to some of our readers:
1. I will be r
Depends on the claim(s) in question which may affect the novelty of the
software or a process more than the VNA hardware. Also, I believe W5BIG has
both a two-port VNA in addition to the single-port CIA line.
Since this discussion is on the topband list, I'm interested in the VNWA's
immunity
On 2/25/2014 1:36 PM, Jay Terleski wrote:
Lets set this record straight. Jan over at SDR kits is a friend, and I met
with him in Germany as well as Dr. Baier. He and I agreed that the patent
is possibly infringed in the USA that Bob Clunn developed and his SDR Kit
business is not really wantin
On 2/25/2014 10:36 AM, Jay Terleski wrote:
Lets set this record straight. Jan over at SDR kits is a friend, and I met
with him in Germany as well as Dr. Baier. He and I agreed that the patent
As long as you are setting the record straight:
what is the patent number(s)?
Rick N6RK
__
"The VNWA 3E was about to get a glowing review in QST a few years ago, but
the guy who sells the AIM products queered it by threatening a patent
fight." Jim Brown
Lets set this record straight. Jan over at SDR kits is a friend, and I met
with him in Germany as well as Dr. Baier. He and I agreed t
You could use the 18 gauge insulated stranded CCS (Copper Clad Steel) wire that
Davis RF and The Wireman sell. The PE jacket is a matte black color and not
very visible from any distance away. It's pretty strong too, and not very
expensive. I use it a lot for wire antennas.
I'm amazed your 22 g
On 2/25/2014 9:45 AM, Jim F. wrote:
Would going to 16 ga. increase the radiated antenna
current X times ?
Not enough to matter, but it certainly would not hurt. For next year,
though, I would try to use more radials. Having them elevated is good,
and elevating them even more is better.
73,
Herb, you can feed any number of bands through one gamma arm or wire as long
as the highest frequency to be used is less than 1/4 wave length on the
gamma arm or wire. The appropriate matching is still required for each
band. I fed my 70ft grounded tower for 160, 80 and 40 meters with a gamma
of
I use 3 raised radials ~ 135 feet long of #22 ga. solid wire.
used for dog perimeter control and is un-tinned copper
covered with green plastic. The wire is about 11 feet
high to keep it out of the way in the common property
woods area of multi building condos and will be taken
down when the we
No - didn't mis-read the stats. 100% rating is good. 66 sales is OK, but I'd be
very concerned about sending nearly $400 to a seller over there with "only" 66
feedback. I've been in business on eBay for a long time (as I mentioned, with
close to 6,000 feedback @ 100%) and there isn't a snowball'
On 1/30/2014 11:03 PM, Carl Braun wrote:
If I can't get the antenna to resonate using the L I'd say that I'd consider
shunt feeding the tower and work out an (omega) matching scheme to match the
tower to my target freq. If that's the case, do I mount my upper shunt arm on
the tower at 67' or
Hi Carl-
For my money, my IW3HEV analyzer works just fine, Same
price, from W4KT. No service if a problem is an issue, but that's
the way it seems today. Only known problem is
the BNC output connection breaks from the PC board. All that's
required is to take about 1/4" off the center pin of the B
34 matches
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