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W1VT

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
QST Downloads Feb 19th 2016, 16:34 3 2,098 on 19/3/18
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 1,467 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 3,341 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 4,016 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 2,966 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 2,822 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 4,502 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 3,022 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 3,011 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 3,646 on 13/9/11

Latest Posts

Topic Author Posted On
Unlimited space with some limits - questions kc4rp 4 days, 9 hours ago
Too bad you can't make an antenna more effective in all directions by adding wire. A longer antenna is more efficient, but a 100 ft dipole fed with open wire is pretty efficient on 80 meters. A much longer dipole can have gain, but gain is obtained but narrowing the pattern. Which may not be such a good thing if you you only have one antenna between two trees. Also, height makes a big difference at HF--an antenna at 30 feet won't work as well as one at twice the height at this point in the Sunspot Cycle.

The American Rose Society had a problem in that their property was overrun with trees, crowding out the light needed to grow roses. They were able to get someone to take out the trees in exchange for the lumber! Hams may want to do something similar--it is a lot easier to install antennas if you only have a few trees surrounding a large field. Also, it may actually help if the field were a couple hundred feet from the house, as this would reduce noise pickup from nearby electronic and electrical devices. RG-6 CATV coax can be used to inexpensively connect antennas at that distance. Either coaxial adapters or UHF crimp connectors can be used to deal with the aluminum shield of RG-6, which is hard to solder reliably.

I find that three dipoles in a triangle pattern works well for covering all directions.

Zak W1VT
ARRL Senior Lab Engineer
Missing something basic here... zahnarzt 2 weeks, 5 days ago

That is to be expected if you just hold down the mic button. You are transmitting "silence." You need to modulate the signal with voice or a tone if you want to hear something else.

Zak Lau W1VT
ARRL Senior Lab Engineer
RFI-quiet computer monitors? K6FOD 3 weeks, 1 day ago
Perhaps you could visit a store that sells monitors and listen to them with a handheld radio to determine the rf-quiet ones. But, monitors run at many different settings, so exhaustively testing them may not be practical. Also, I've heard interference that only shows up when when I run my logging program.

Zak W1VT
ARRL Senior Lab Engineer
Newbee Setting up my First Ham Shack ronniemus 4 weeks ago

http://www.arrl.org/limited-space-and-indoor-antennas
This page has some ideas.

Zak Lau W1VT
ARRL Senior Lab Engineer
Newbee Setting up my First Ham Shack ronniemus 1 month, 1 day ago
Getting approval from a HOA for small loop antenna may be difficult under current laws. It may easier to put up a flagpole and use that as an antenna. The Freedom to Display the American Flag act of 2005 requires HOAs to make reasonable accommodations. There is a similar law in Florida that is more detailed in spelling out what HOAs must allow.

Zak Lau W1VT
ARRL Senior Lab Engineer

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