ARRL

Secure Site Login

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 1,286 on 19/2/16
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 993 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 2,875 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 3,471 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 2,509 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 2,373 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 3,975 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 2,605 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 2,544 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 3,198 on 13/9/11

Latest Posts

Topic Author Posted On
Novemeber 2017 - Antenna Analyzer rrmccabe 5 days, 6 hours ago
https://www.youtube.com/watch?v=LUbt3W4hnTE
KE4EST has a video of his version of this project. He says he has compared it against an SWR meter.

https://groups.yahoo.com/neo/groups/SoftwareControlledHamRadio/info
Not only is there discussion about this project on this Yahoo forum, but Jack, one of the project designers, can be reached here.

Zack W1VT
ARRL Senior Lab Engineer
Novemeber 2017 - Antenna Analyzer rrmccabe 6 days, 19 hours ago
SWR analyzers have issues when there are nearby transmitters present--the simple diode detectors can't tell the difference between the reflected signal and a strong radio signal picked up by the antenna. One way to see how bad things are is to connect a 50 ohm load and a diode detector directly to the antenna.

Zack Lau W1VT
ARRL Senior Lab Engineer
Noise Evaluation Process KI7LFD 1 week, 1 day ago
http://nk7z.net/
He has used SDR or software defined radio to track down RFI in his area and written about it on his web site.

ftp://ftp.ngdc.noaa.gov/ionosonde/documentation/CCIR20Characteristics20Applications20Atmospheric20Noise%20Data.PDF
A study of noise by the International Telecommunications Union

Zack Lau W1VT
ARRL Senior Lab Engineer
New Magazine waky53 1 week, 2 days ago
I believe this a test of publication intended for new hams. It is in the magazine format because that is the cheapest way to test market a paper publication.
Kenwood ts440s K7TNS 1 week, 4 days ago
Are the VCO parts covered with a potting compound? If so and there is no other obvious component failure it is likely it has gone bad and needs to be removed. But, at 30+ years, all sorts of failures are possible.

Zack Lau W1VT
ARRL Senior Lab Engineer

Back to Top