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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
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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 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
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.
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.

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