Author Archives: David Casler

Modeling the Simple Inverted Vee Antenna #102

What can we learn about the Inverted Vee HF single-band antenna from the EZNEC+ model? Lots of things, having to do with height above ground, the amount of spreading, and using a metal pole as a mast. Tune in for … Continue reading

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Modeling Common Dipole Variations (#101)

Viewers queried me about what happens when you shorten a dipole by letting the ends hang down, or have to put up a dipole that can’t be in a straight line, and I was also curious about the effect of … Continue reading

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STRANGE! Atmospheric Weirdness (Out of cycle video)

These strange atmospheric formations are weird! I’ve never seen anything like them. Okay all you weather scientists out there, what are they? You can see a list of Ask Dave videos by clicking here. You can ask a question by … Continue reading

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How High Should a Dipole Be? A Look at Antenna Modeling (#100)

How high should a dipole be? What happens if it’s too low or too high? We turn to EZNEC antenna modeling software to see that the old rule of thumb of one half wavelength is correct. But there are lots … Continue reading

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The Coax Connection: Interview about bad coax with Ray Nelson, N1MPD (#97)

My second interview with coax expert Ray Nelson, N1MPD, covers how coax can go bad, primarily due to water entry. We talk about the proper method of waterproofing coax connections, and how to spot the poor quality coax that masquerades … Continue reading

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J-38

For Tom Medlin’s show by KEØOG You can see a list of Ask Dave videos by clicking here. You can ask a question by clicking here. You can go to my YouTube channel by clicking here. And the tip jar … Continue reading

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Review of CyberLink PowerDirector v16 (new release) #98

Description – PowerDirector15 http://goo.gl/FLPbnK. Here’s an out-of-cycle video describing the video editor I rely on heavily in the production of the Ham Radio Answers and Ask Dave videos, as well as the Tech, General, and Amateur Extra training videos. Note: … Continue reading

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Rigol DG1022Z Arbitrary Function Generator (AD #94)

My new Rigol DG1024Z Arbitrary Function Generator, or more normally, a signal generator, looks like a great addition to my test equipment. Caveat: this is not sponsored. I paid for it using tips, and I intend to use it to … Continue reading

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Review of Pracomm SML-1000-1 HF Loop Antenna (# 95)

Roberto Arranaga, KX4CY, felt that commercial small HF loops were too expensive, so he’s made his own for sale at www.pracomm.store which has an interesting tuning method using a wide range tuner (such as the MFJs). I tried it and … Continue reading

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Exploring the Yagi, Log Periodic, and Phased Array Antennas (#92)

Discusses the difference between Yagi antennas, log periodic antennas, and phased array antennas. Also, I’ve picked up a sponsor, JLC Printed Circuit Boards, www.jlcpcb.com. This is the first time I’ve had a company sponsorship! Thanks to my wife, Loretta, KBØVWW, … Continue reading

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