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 | 3 | 3,177 | on 19/3/18 |
| March 2016 QST Compact Multiband Dipole | Feb 19th 2016, 15:23 | 1 | 2,061 | on 19/2/16 |
| Antenna analyzer vs feedline type | Sep 21st 2012, 14:37 | 1 | 3,818 | on 21/9/12 |
| USB to Serial Port problems--Prolific Drivers | Aug 3rd 2012, 18:27 | 2 | 4,556 | on 26/12/15 |
| Italian Phishing emails! | Dec 13th 2011, 14:20 | 1 | 3,416 | on 13/12/11 |
| John K0GMO needs help designing SS Amp | Nov 17th 2011, 15:53 | 1 | 3,339 | on 17/11/11 |
| 1 Farad Capacitor to Eliminate Headlight Flicker? | Oct 19th 2011, 13:14 | 4 | 5,097 | on 9/11/11 |
| History of Relay Rack Dimensions? | Oct 17th 2011, 12:58 | 2 | 3,459 | on 25/10/11 |
| Miswired Selsyn | Oct 13th 2011, 17:51 | 1 | 3,522 | on 13/10/11 |
| Stealth Antenna wire | Sep 12th 2011, 12:51 | 2 | 4,132 | on 13/9/11 |
Latest Posts
| Topic | Author | Posted On |
|---|---|---|
| broomstick antenna parameters | henryrichter | 4 days, 11 hours ago |
| Ideally, you would attach a high impedance preamplifier to the base of the antenna. This would allow excellent signal transfer even without the expense of a tuner. You may want to study "Active Antennas," originally invented by R W Burhans to better understand this concept. If you add a length of coax, the capacitance of the coax will shunt a significant amount of signal if the antenna has a high impedance, and a negligible amount when the impedance is low. The need to tune an antenna to resonance may be considered by some users to be an unnecessary hassle. Portable shortwave receivers often come with untuned whip antennas connected directly to a high impedance preamplifier. Zak Lau W1VT ARRL Senior Lab Engineer |
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| Power Line noise - cold temperatures | W5FN | 1 week ago |
| The ultrasonic dish is too narrow to identify particular pole. A 400MHz Yagi and AM receiver is typically used to locate the pole. The dish is then used to locate the hardware on the pole. Some VHF handhelds have wideband AM receivers that can be used for direction finding, while others are FM only and not really useful. Zak W1VT ARRL Senior Lab Engineer |
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| AA4PB Audio Interface: Any advice? | NV2K | 1 week, 5 days ago |
| http://www.arrl.org/arrl-periodicals-archive-search | ||
| Balun for Doublet Antenna | N8EUI | 1 week, 6 days ago |
| http://www.karinya.net/g3txq/tuner_balun/ study of the best balun to use A 130 ft center fed dipole fed with 100 feet of 450 ohm window line and a 1:1 current balun is one of the better known combinations. W5DXP has a downloadable spreadsheet if you would like to know good combinations of dipole and ladder line length for different bands. http://www.w5dxp.com/goodbad/goodbad.htm Zak W1VT ARRL Senior Lab Engineer |
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| Un identified signal | 2 weeks ago | |
| It may help to listen on a battery powered radio and shut of the main AC breaker to the house. Often the source is inside. Switching individual breakers can localize the source if it is inside. Zak W1VT ARRL Senior Lab Engineer |
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