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 |
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| 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 |
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| 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 |
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| 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 |
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| fldigi WF button bug | W3HBM | 3 weeks, 3 days ago |
| http://w1hkj.com/FldigiHelp-3.21/html/new_installation_page.html | ||