Category: Electronics

Modifying the BITX40 for Upper Sideband

These are the capacitors to remove, c91 and c92

Because some digital modes require Upper SideBand (USB) to work properly, many people have been wondering how to get the BITX40 on Upper Sideband. Well, I’m here to show you- it’s pretty easy! First, we need to understand that to get the BITX40 on Upper Sideband, we just want to change from a negative offset …

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BITX40 Builds: M6YPA’s 3D Printed Case and Microphone

Today we bring you a beautiful 3D printed case from Adrian Cattell, M6YPA. Here are the pictures. See below for Adrian’s description of the case, and how it came to be. Thanks for sharing, Adrian! Update:┬áThis case is now available for purchase from Dave,┬áKE0KHA. Click Here to go to his site and get one of …

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The BITX40 FAQ

The BITX40 FAQ All around the web folks are asking questions about the BITX40v3. This is my attempt to answer the most common questions raised. I am not affiliated with hfsigs.com or anybody who is. If you have your own question about the BITX40, leave a comment below and I’ll be glad to answer it. …

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BITX40: L-Match Tuner Update

In a previous post (BITX40: L-Match Tuner for an End Fed Antenna)I built an L-Match tuner using advice from Peter Parker, VK3YE. I also followed his “Tune for Maximum Brightness” RF current indicator. I had indicated that the current indicator worked fine, and I thought I did, but I was not seeing the results I …

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BITX40 Progress: Easier Tuning and a Microphone

In our last BITX40 Progress installment, I showed you the box contents, and a basic setup that I’d come up with. The controls and connectors were all on the top panel, and it was all loose. Since then, progress has been made! I’ve put up an antenna (more on that in another post) and built …

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Cheap Soldering Iron: Which one?

In this entry we’ll talk about my search for a cheap soldering iron. I’ve been burning myself with cheap soldering irons since I was about 10 years old and I taught myself various bad ways to solder. I’ve dabbled in electronics here and there since then, always curious but not really knowing what I was …

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BITX40: L-Match Tuner for an End Fed Antenna

Can you hear me now? With my BITX40 in a temporary enclosure and with the PTT switch and Mic connected, it was time to try to make some contacts. I’d tuned the trimmer capacitor next to L4 it so that I could get into the upper part of the US 40M band and ended up …

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Amateur Radio: Dissipating Static Electricity on wire Antennae

We’re trying to get my friends station setup complete. We got his radio installed, and an End Fed Half Wave (EFHW) 40-20-15-10M antenna installed. The problem is that electrical noise is fairly bad on it, and he can hardly hear some signals. One solution to this is to make an RF Choke out of extra …

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Build A 70 Amp Arc Welder

In this post my intent is to show you the original tutorial that I used to build my 70 amp arc welder (pictured left). I built it myself using Microwave Oven Transformers. I intend to build another one this year and will use these instructions again. Since the original site, aaawelder.com is offline, I utilized …

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