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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 1 778 on 19/2/16
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 681 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 2,582 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 3,118 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 2,245 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 2,080 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 3,634 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 2,346 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 2,240 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,897 on 13/9/11

Latest Posts

Topic Author Posted On
QST archives or not KG5OOU 5 days, 8 hours ago
http://www.arrl.org/product-review

http://www.arrl.org/reviews-listed-by-manufacturer
Understanding SWR ralphm 1 week, 1 day ago
Our original archive allows the download of older articles.

http://www.arrl.org/arrl-periodicals-archive-search

Zack W1VT
ARRL Senior Lab Engineer
how can you measure the rx noise floor at your qth KK4BHS 2 weeks ago
In theory, it is just a matter of looking at a panadapter display that goes down to -130 dBm or so with a 2 kHz bandwidth. In theory, the thermal noise limit is -174 dB/Hz so with a 2kHz bandwidth the maximum sensitivity of a receiver with that bandwidth is -140 dBm. Most people are very good at picking out various signals and ignoring them when making an estimate of the noise floor--it may be a little tougher to program an automatic system to make that distinction. It is very easy to introduce common mode noise generated in the ham shack while making his measurement. Tom, W8JI has some suggestions on this web page.
https://www.w8ji.com/noise.htm

Zack Lau W1VT
ARRL Senior Lab Engineer
QST archives or not KG5OOU 2 weeks ago
Login to arrl.org
Then go to this page
http://www.arrl.org/arrl-periodicals-archive-search

Zack Lau
ARRL Senior Lab Engineer
fldigi WF button bug W3HBM 3 weeks, 3 days ago
http://w1hkj.com/FldigiHelp-3.21/html/new_installation_page.html

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