ARRL

Secure Site Login

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
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/
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
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.

Back to Top