[Lowfer] Lowfer JH
John Hamer
wilbur0611 at gmail.com
Tue Feb 11 21:26:48 EST 2020
Lowfer JH is back up. I built a booster for the final to keep the output
from my batteries at 26vdc. This allowed me to reinstall my LM317 and
adjust it to the ~23.5v required to get 950mw to my final. It will also
compensate for the voltage dropping over the few days between battery
charges. I am interested to see how stable the tuning is now.
I also made a smaller variable inductor inside my loading coil with a shaft
so I can motor-drive it when I build my auto tuner. The previous one was a
little large to spin on a shaft, so I had it wedged inside the loading
coil. This made tuning frustrating, especially at night while holding a
flashlight. I'm sure it shifted occasionally on it's on.
The last thing I did was put a few coats of urethane on the wood stand to
protect it. It is non pressure trusted SPF, so it wouldn't have lasted long.
I have a lot of pictures at www.jwhamer.me/lowferJH/
They are unnamed, and large, But if you have some time and a fast internet
connection, check them out.
John Hamer
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