uBitx – Part 4

Here is my completed uBitx. It worked perfectly the first time I applied power. Well, except I had the encoder wires backwards so the tuning was backwards, but I don’t count that. The microphone, keyer and external speaker jacks are on the front panel. I plan to make custom knobs (red of course) on the lathe when I get time. There is a custom made heat sink on the back. It connects to a custom made piece of thick aluminum on the inside of the case where the final transistors mount. This view show power and RF connections. You can

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Notes from Portable Operation

Even though I’ve been a Ham for 44 years, I have not done a lot of portable QRP operations. I have built numerous home brew QRP radios and several QRP kits, but have never taken them to the field. I guess I like to build radios more operating them. My recent QRP operating from the vacation cabin was the first time I’ve set up in the field since the 70’s, when I operated with a Heathkit HW-7. I’m very familiar with all the problems that can be encountered in QRP field operations, but I didn’t realize how difficult some of

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Portable Operations

I am operating portable this week from the vacation cabin in southern Indiana. I’m using a dipole and a home brew radio I made back in 1993. It’s my version of the Micromountaineer with the addition of a VFO for the receiver. I call it the SB-40. (I will post info on this rig in the Projects page.) The antenna is newly constructed before the trip and I didn’t have time to tune it. The dipole was thrown together right before the trip using RG-178 mini coax, some Teflon coated #24 hookup wire, and a home made center insulator made from

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