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Amateur Radio : Recent Questions and Answers (Page 4)

Find answers to your questions about Amateur Radio or help others by answering their Amateur Radio questions.

Is a 1/4 wave vertical actually better than inverted L on 160m?

Surprisingly, I am unable to find much info comparing these two antennas. Essentially, they are the same except the one is shorter and top loaded with one wire. Does anyone...

Asked on 09/27/2021 by Synaps3

2 answer

Ground-Plane radial sizing, is there such thing as too long?

I'm just trying to make sure I understand the theory correctly. I have some triband VHF/UHF/800MHz antennas, I need to mount on a tower so I plan on using a...

Asked on 09/27/2021

3 answer

Do chokes at the antenna feedpoint stop the coax from receiving signals as well, or just transmitting?

It seems common knowledge that a choke at the antenna feedpoint stops the outside of the coax shield from radiating when transmitting into the antenna. But what about stopping...

Asked on 09/27/2021

5 answer

Effective area of a phased array

For a $N$-element planar phased array, all the elements are same isotropic antennas. Then, what is the effective area of this array? Is it$$A_e=frac{lambda^2}{4pi}GN$$where $G$...

Asked on 09/27/2021

1 answer

What is the maximum antenna cable length allowed in GNSS application?

I am beginner in designing GNSS receiver design and facing concern while testing the high precision GNSS survey.I am using GNSS survey grade antenna for my GNSS receiver application testing,...

Asked on 09/27/2021 by BalkisMM

1 answer

What Are the Properties of 43' Vertical Monopoles Used as Multiband Radiators?

43' vertical monopoles sometimes are used with an auto-tuner at their input as radiators in the ham bands from 40m through 10m, but are any performance compromises required to do...

Asked on 09/27/2021

1 answer

Why does the HamQSL website say the 40m band is fair and the 20m band is poor during the day?

http://www.hamqsl.com/solar.html Why is 40m shown as "fair" while 20m is "poor" during the day. Shouldn't 7 MHz be getting absorbed by the D-layer more than 14 MHz?...

Asked on 09/27/2021 by Macuser

2 answer

440MHz collinear dipole array - suitable coax?

friends! Finally found my next antenna project..a collinear dipole array for the 70cm US ham band. The general idea: (image...

Asked on 09/27/2021 by user14945

1 answer

Why can I hear Morse when not in CW mode?

I don't "get" CW. I can't understand the chatter on an FM radio broadcast when my radio is set to AM. This makes sense, the signal is modulated using frequency...

Asked on 09/27/2021 by Cimm

3 answer

Can the parallel capacitance of a quartz crystal be directly measured?

A quartz crystal is often represented by this equivalent schematic: simulate this circuit – Schematic created using CircuitLab How to measure quartz...

Asked on 09/27/2021 by Phil Frost - W8II

2 answer

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