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Amateur Radio : Recent Questions and Answers

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

Pondering variations on the vertical bazooka antenna

I've seen these antennas built out of coax that are called a bazooka vertical. It's a kind of 1/4 wave vertical, or perhaps a 1/2 wave dipole. Constructing...

Asked on 11/27/2021

1 answer

Convincing kids to learn NATO alphabet

I'm trying to make learning of the NATO alphabet interesting for kids. I invite them to spell car plate numbers during vacation with their parents. So both, the kids and...

Asked on 11/22/2021

3 answer

50Ohm Coax presents 50 Ohms of impedance on which frequency?

Either there's a simple answer that I'm not finding in a spec sheet somewhere, or, I'm asking the wrong question!...

Asked on 11/13/2021

4 answer

Why are many ground radials preferable to a single ground stake buried 1m deep?

Surely a 1m copper stake provides better ground connectivity for a vertical dipole?...

Asked on 11/13/2021 by Adam Palmer

4 answer

Non-traceable radio emitters

There are various techniques for locating a radio emitter. But what are some methods to make this really difficult? There is usually a patch to every vulnerability, at least from...

Asked on 09/27/2021 by Chi non salta Pavarotti è

5 answer

How to prevent cracking the capacitors in my diplexer?

Just made my first 2m/70cm diplexer. Important: I aim to be able to use this up to 50 Watts....

Asked on 09/27/2021

1 answer

Lightning protection for a vent stack antenna

I've seen ham radio antennas that slide over a vent stack. The usually way to connect them to the transceiver is to lay the feedline across the...

Asked on 09/27/2021 by watkipet

1 answer

What is the name of a device used to detect noisy appliances?

I live in an apartment. I don't have control over all of the appliances but perhaps I can mitigate if I know where the noise is coming from and under...

Asked on 09/27/2021 by NonYaBidnezz

3 answer

What kind of RFI is this?

I'm getting a lot of noise now that I have a dipole higher up. The pattern on the waterfall makes...

Asked on 09/27/2021

2 answer

Choice of PCB coil design for filter inductor at ca 20 to 400 MHz, 5 W

Looking at the diplexer schematic from this nice question, I realized this can completely be done in PCB-formed elements (minus the connectors)....

Asked on 09/27/2021

0 answer

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