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Amateur Radio : Recent Questions and Answers (Page 3)

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

Supershield or Superscreen coax: Does it exist? What is its common name?

I'm sure this seems like a Google question, but I've BTDT and come up empty. The problem I'm trying to solve is to obtain cables that are as "leak proof"...

Asked on 09/27/2021 by user103218

2 answer

Where to find HF channel models or statistics?

When designing a waveform for packet radio usage, it'd be helpful to know a few things, mainly distribution of coherency bandwidthsdistribution of coherency timesWhilst such statistics are reasonably possible to...

Asked on 09/27/2021 by Marcus Müller

2 answer

Commercial Loopstick Antenna Manufacturers?

I am an electrical engineer working on a product that needs a loopstick antenna. I had thought that AM radios were so commoditized that I'd be able to find an...

Asked on 09/27/2021

1 answer

Outdoor Terrestial Digital TV Receiver Antenna: 500-700 MHz Band, Can I Make It Work Better?

See the unconventional antenna shown below, The whole antenna is made of two mirror-imaged Alum metal stampings on either side of a 2-cm hollow 31-cm long rectangular plastic boom. The...

Asked on 09/27/2021 by Roe

1 answer

Creating a low cost ear protection/ PTT setup for hunting

I have been trying to create a low cost communication setup for when I go hunting. Using this setup the hope is to be able to talk to one...

Asked on 09/27/2021 by Layne Hedrick

1 answer

Double Cross Dipole antenna for 437 MHz don't tune

I'm building a Double Cross Dipole antenna for 437 MHz to be used with a SDR receiver for CW cubesat.The idea is to follow this "classic"...

Asked on 09/27/2021 by Carlo IU2KQB

1 answer

What is an expected SWR plot for a trap dipole?

I've build a trap dipole for 20/40m bands. Traps are made of a coil wound on an insulator of RG213 coax and 3 kV NP0 capacitors. The impedance measured with...

Asked on 09/27/2021 by Aleksander Alekseev - R2AUK

3 answer

How to measure quartz crystal motional parameters using a VNA?

I want to measure quartz crystal motional parameters with a VNA. Unfortunately all Google searches I've done have lead me to nothing in concrete. I know how to get an...

Asked on 09/27/2021 by S.s.

2 answer

How does this quarter-wave stub balun work?

I was searching for 1:1 balun designs that would be efficient at VHF yet could easily be made from commonly available materials when I came across these two: ...

Asked on 09/27/2021 by Ivan R2AZR

2 answer

How much loss is there in traps, really?

I searched and couldn't find a direct answer so thought I'd ask. We all know the mantra "traps aren't good as they have losses", but how much loss are we...

Asked on 09/27/2021

2 answer

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