W1VT
| Joined: | Sat, Apr 4th 1998, 00:00 | Roles: | Super Moderator | Moderates: | N/A |
Latest Topics
| Topic | Created | Posts | Views | Last Activity |
|---|---|---|---|---|
| QST Downloads | Feb 19th 2016, 16:34 | 5 | 7,411 | on 25/4/20 |
| March 2016 QST Compact Multiband Dipole | Feb 19th 2016, 15:23 | 1 | 4,374 | on 19/2/16 |
| Antenna analyzer vs feedline type | Sep 21st 2012, 14:37 | 1 | 5,892 | on 21/9/12 |
| USB to Serial Port problems--Prolific Drivers | Aug 3rd 2012, 18:27 | 2 | 6,924 | on 26/12/15 |
| Italian Phishing emails! | Dec 13th 2011, 14:20 | 1 | 5,505 | on 13/12/11 |
| John K0GMO needs help designing SS Amp | Nov 17th 2011, 15:53 | 1 | 5,597 | on 17/11/11 |
| 1 Farad Capacitor to Eliminate Headlight Flicker? | Oct 19th 2011, 13:14 | 4 | 7,549 | on 9/11/11 |
| History of Relay Rack Dimensions? | Oct 17th 2011, 12:58 | 2 | 5,529 | on 25/10/11 |
| Miswired Selsyn | Oct 13th 2011, 17:51 | 1 | 5,662 | on 13/10/11 |
| Stealth Antenna wire | Sep 12th 2011, 12:51 | 2 | 6,269 | on 13/9/11 |
Latest Posts
| Topic | Author | Posted On |
|---|---|---|
| Noob Looking for Direction | gsqwared | 13 hours, 57 minutes ago |
| Worldwide communication typically requires the use of HF ionospheric skip. The 17M and 20M are typically the best bands for this. A Yagi beam on a tower between 70 and 100 ft would be ideal, but most folks have to do the best they can with the resources they have available. 15M may be useful at lower latitudes near the equator. VOACAP and be useful for predicting station capability voacap.com may be a helpful web site. A legal limit amplifier would be useful for talking to stations with compromise antennas and high noise levels. It can be difficult to hook up with low power stations with excellent receivers as it isn't always obvious who can hear well. People tend to call stations with loud signals and assume that if they are loud, they can hear well. Zak W1VT ARRL Senior Lab Engineer |
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| BBC Reports WSPR helping locate MH370 | K9YO | 3 days, 18 hours ago |
| https://www.mh370search.com/2021/04/03/wsprnet-and-inmarsat-satellite-data/ | ||
| Output impedance coupling for LDMOS (2) mono band amplifiers | K6TAR | 4 days, 6 hours ago |
| Interesting idea, but with the refarming of TV spectrum there are surplus television amplifiers for hams who want that sort of power and don't mind experimenting. https://www.mmra.org/larcan/ |
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| Very unique RFI | KC0RR | 5 days, 14 hours ago |
| Power line noise is typically weather related, as power lines are exposed to the elements. Zak W1VT ARRL Senior Lab Engineer |
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| 500 miles on 15-meters | tarny | 5 days, 23 hours ago |
| I'd suggest a rotatable Yagi on a tower. What you are looking for is backscatter or sidescatter paths, as normal F2 skip does not support such a short path. These paths will be much weaker than normal F2 skip, so more power is normally required. Often, these weaker signals are buried under signals propagated by normal F2 skip. Two stations working together should focus on illuminating a common scattering volume. |
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