Friday, September 21, 2012

Project Clean Up Part 1 Chapter 4

Chapter 4: "Clean Up and Key Down!"

This is a continuation, the First part is Here,  a complete list is available under "Ham Radio Master links" on the sidebar.

I decided to open the power supply up, and clean up some circuitry. I wanted to make sure that things stayed put once I was ready to QRV. Here's how things looked before getting them all put together.
 Innards of the power supply. You will see in the final pic that I replaced the B+ wire, the red and black wire in this picture

and here's the transmitter:
I secured the top to the the lid using some ultra heavy duty fastener called dual lock. I wanted a rock solid mount, and I  think I got it!
I have two other plans for the transmitter that I haven't decided if I'm going to do yet or not. First, I'm thinking of replacing the clips for the crystal. I'm not really satisfied with how they connect but they are protected. Second, I'm thinking of breaking the rig down, and redoing the chassis all together. The lil' Altoids tin it's on now is showing its ten years of age.

 In this pic you can see the transformer, two filter caps, ground connection, and B+ line out. Everything is ready to be buttoned up and fed AC! The caps are mounted to the aluminium plate using mounting tape, and actually rest upside down inside the Power supply. I actually bought a 50 Ohm 10 watt resistor to go between the caps, but decided that the 45 ohm 5 watt would work better because of size. Radio Shack doesn't carry a 45 Ohm power resistor in the store, they carry a 0.47 :/
if you look closely at the power cord, it has a piece of heavy gauge magnet wire wrapped around it, this is to prevent me from accidentally pulling the cord out of the power supply, placing stress on the solder connections, and generally increasing the potential for fail.

Now for a demonstration of the awesome power of hollow state:
My theory on increase power output is that the powerbuss solder connections are better now, and tubes are awesome.
seriously on the powerbuss connection though.
Originally, in the interest of using things over and making due, I had hooked up connections with some spare wire I had laying around that at one point in time was part of a microwave. I noticed when I was hooking things up that this wire was silverish and didn't take solder well. As I remember there was no solder for power buss lines in the microwave, it used crimped terminal connections. hmmmm, probably is made from something from the lowest bidder. Fortunately, I also had some real buss wire laying around, so I replace unknown material with copper.
More copper means less power wasted heating a wire.
Here's how everything looks set up and ready to play:

no QSO yet. Will announce on twitter, QRP-L, SKCC facebook group, and other places when I get QRV.

Continue on to Chapter 5: "Ecstasy and Agony"

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