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W1VT

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

Latest Topics

Topic Created Posts Views Last Activity
QST Downloads Feb 19th 2016, 16:34 5 9,466 on 25/4/20
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 5,868 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 7,533 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 8,463 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 7,134 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 7,051 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 9,300 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 6,887 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 7,095 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 8,006 on 13/9/11

Latest Posts

Topic Author Posted On
2 Meter Tape Measure Antenna Questions K3OHU 1 day, 13 hours ago
The effective diameter of the tape measure is much greater than a thin wire or rod. As the diameter increases the resonant frequency increases and the elements need to be shorter.

http://theleggios.net/wb2hol/projects/rdf/tape_bm.htm
https://www.instructables.com/The-Tape-Measure-Antenna/
This design uses a hairpin match. The driven element is cut shorter and an inductor is placed across it to effectively step up the feedpoint impedance.

The gain of a Yagi is a function of boom length, not the number of elements. With just 3 elements more gain can be obtained by making the driven element farther away.

Zak Lau
ARRL Senior Lab Engineer
Front end greatly attenuated fredffb@gmail.com 5 days, 14 hours ago
Interference from solar systems is usually something that goes away at night. Do you still have the problem at night? You may be able to turn off the inverters to do a test during the day.

There are many devices that can cause RFI. It is possible for the inverters to be clean but the power supply powering a WiFi data collection system associated with the supply to cause RFI.

Zak W1VT
ARRL Senior Lab Engineer
QRM Problem LW, MW and SW SOLVED! KG4LAC 1 week, 1 day ago
Great to hear you were able to track it down to a twenty year old Memorex DVD player.
QRP Wattmeter article WT1V 1 week, 3 days ago
http://www.arrl.org/files/file/QST%20Binaries/2022%20QST/102022/Sittner.zip

I was able to log out of and then download this file.
Solar Wind and ham sattelite problems WB6TOU 2 weeks, 5 days ago
My research suggests that amateur satellites typically pass below the Van Allen Belts where radiation is unusually high. The location of these belts is not clearly defined.

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