ARRL

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 1 515 on 19/2/16
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 513 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 2,433 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 2,932 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 2,126 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,959 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 3,348 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 2,234 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 2,122 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,752 on 13/9/11

Latest Posts

Topic Author Posted On
Mount discone antenna ontop of tv antenna thefuzz4 2 days, 6 hours ago
http://forums.qrz.com/index.php?threads/tv-and-ham-antennas-on-the-same-mast.162627/
Short vertical built for one frequency K1BBB 1 week, 1 day ago
http://www.arrl.org/files/file/History/History%20of%20QST%20Volume%201%20-%20Technology/QS03-73-Sevick_opt.pdf
This classic article by Jerry W2FMI has very useful experimental data for designing short vertical antennas.

Zack W1VT
ARRL Senior Lab Engineer
60 meters - digital use w8mrl 1 week, 1 day ago
http://www.arrl.org/forum/topics/view/407
This thread contains the letter from the NTIA clarifying the use of digital modes. It mentions the use of one very narrowband digital mode, PSK31.

https://www.fcc.gov/ecfs/filing/6016996545/document/7021871884
This letter indicates that the NTIA is aware of the ARRL proposal for multiple PSK or CW signals on channel and provides a response.
antenna close to metal roof: effects? KO0Y 2 weeks, 1 day ago

While not the same as your case, this ham has modeled the effect of roof with large metal panels.
https://www.qrz.com/db/OE1VMC/

Zack Lau W1VT
ARRL Senior Lab Engineer

Converting a 80M dipole to 160M ? hamwillyt 2 weeks, 5 days ago

You need to add about 66' on each side of the dipole.

An 80M dipole is typically around 125 feet from end to end, while a 160M dipole needs to be around 257 feet from end to end. The exact length will vary depending on height above ground and wire insulation. The demo version of EZNEC can be used to calculate a more accurate starting value than the traditional 468/f formula.

Zack Lau W1VT
ARRL Senior Lab Engineer

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