[Top] [All Lists]

Re: [TenTec] New and Improved Terminology (NVIS origins)

To: Rick - NJ0IP / DJ0IP <Rick@DJ0IP.de>
Subject: Re: [TenTec] New and Improved Terminology (NVIS origins)
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 05 Jan 2011 11:17:25 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>

On 1/5/2011 10:58 AM, Rick - NJ0IP / DJ0IP wrote:
> Jerry, let me throw two things at you:
> 1. I think a horizontal loop is a pretty good radiator, straight up.

And those who like them find they work well for operations like SS and 
FD where working stations in surrounding states on 80 and 40 is good. 
One I used at a club FD was not small and worked well. One I put up in 
my back yard for working a 400 mile path on 75 meters worked poorly for 
that path.
> 2. The vertical dipole antenna I've described has been in use here for
> nearly 20 years, at 3 different home QTH's and countless portable
> operations.  On 80m where one would think it is too short to work, I found
> that I was always just as loud working stateside, JA, or VK, etc. on the
> short vertical dipole, as I was on my full size horizontal dipole which was
> only 40 ft. up.  Nobody on this earth can convince me I'm wrong because I
> have a logbook full of QSOs to prove it. (don't forget, I was in Germany)

It takes a good tuner to tune such a short antenna and even then its 
hard to get a lot of current in the radiator and its the current that 
radiates. It would be more effective on 80 with capacity hats and end 
loading coils to increase the current in the radiating portion. But it 
still radiates better than the incandescent lamp dummy load that has 
been responsible for more than a few contacts on 10 or 15 meters over 
the decades.
> So, if someone tells me they can't get on 80m because they have no room, I
> just say humbug!
> You can get a good fiberglass pole, 40 ft long, for about $120 from
> companies like Spiderbeam.
> You can get 100 ft. of openwire (300 ohm or 450 ohm) for probably $35.
> Add 40 ft. of copper wire and you have a good 80m antenna (well 80 thru 10m
> antenna).

Its a little long for 10 and 15 meters, the signal at low angles is 
attenuated seriously, but for sporadic E higher angle radiation is often 
> While living in Oklahoma (until last week), I used a bigger version.
> Using a 60 ft. Spiderbeam pole, I built my vertical dipole with 30' per
> side.
> On 80m in CQWW CW with about 800w, I was able to work every dx station that
> came up on the DX cluster, be it in Africa, or anywhere else, with just one
> or two calls.
> As I said, people highly underestimate how well these antennas work.
> L.B. Cebik W4RNL (SK) didn't.  He too was a fan of the vertical dipole.
> Actually, the main reason it works so well is because most people use
> antennas on 80m which are worse!  Hi
> I agree, you should have good success with a vertical mounted on the metal
> building.
> I've always wanted to try that but never had the building.

I bought an antenna for that purpose right after I built a metal 
building on ground I planned to build a house on in 1989. I've not yet 
built that house, never will, but I built a second machine shed so I 
could convert the first to house, but a proposed mall next door and the 
fact that I never succeeded in totally weather proofing the metal 
building and I got lazy with age so that didn't happen. In 2009 I bought 
a house further out in the country with the latest Morton metal building 
and for 13 months I concentrated on moving out. Now I'm moving in and 
thinking much more about antennas. I have some on tripods on the roof 
(tripods were already there) for VHF/UHF and last night I strung a wire 
inside the house for receiving. Copied Europe on 75 very late at night 
when the furnace was off. Have a furnace RFI problem to cure now.
> 73
> Rick
The only problem with the antenna on the shed roof is that a feed line 
to the house will be 150 feet long, though I could set up an operating 
position in my camper that's stored inside and equipped as a mobile ham 
station already. Or I could shove the debris aside and build a dedicated 
ham shack in a corner. And put up the VHF/UHF/microwave tower along side 
for short feed lines. Maybe I should put the ham shack up in the roof 
area to shorten feed lines even more. Or go with an Omni VII and an 
ethernet controller for the rest of the gear when I didn't want to walk 
from house to shed for hamming.

73, Jerry, K0CQ
TenTec mailing list

<Prev in Thread] Current Thread [Next in Thread>