The Cranky Sysadmin A world of technology, fun, and ignorant rants.

January 31, 2012

Lots of Little Radio Projects

Filed under: ham radio — Cranky Sysadmin @ 7:55 pm

I’ve recently done a lot of small but interesting projects. I should probably break each out into its own small article, but I’m lazy, so you get to see a mishmash.
Radio related projects

January 23, 2012

LC Meter Update and Source

Filed under: Electronics,ham radio — Cranky Sysadmin @ 6:50 pm

I finally cleaned up the source code from my rendition of the LC Meter. Here s the source. Here is a modified freq counter library which works with my Arduino Mega2560. The original frequency counter library is here. If you have a mega1280, the library may not work without similar modifications that I made for the 2560. The AVR_MEGA1280 is lumped in with the other arduino flavors in the original library. I don’t have a mega1280 to test with so I didn’t make changes to it.

January 15, 2012

The Hunt for a Good Compromise Antenna

Filed under: ham radio — Cranky Sysadmin @ 11:10 pm

I’ve been tinkering with my homebrew slinky antenna and my G5RV lite which I picked up and Ham Radio Outlet. I’ve decided to abandon the slinky dipole. It will easily tune to everything from 80 meters to 6 meters, but there is always a lot of noise compared to the G5RV. Due to the fact that there are no trees on our lot and the fact that I don’t want questions from the neighbors, the highest I’ll be able to get an antenna is about 25 feet, the height of the house.
What shall I do for an antenna?

January 2, 2012

An Improved Antenna Tuner

Filed under: ham radio — Cranky Sysadmin @ 8:49 pm

In the continuing saga of my antenna tuner, I think I’ve come to a place where the tuner is close to as good as it gets with my limited knowledge.
Recent improvements on my antenna tuner

January 1, 2012

Antennas and a Homebrew T-match

Filed under: ham radio — Cranky Sysadmin @ 10:07 am

In my last post, I mentioned that I was having much better luck with a slinky dipole then a G5RV. It turns out that I was misinterpreting the data. I can match the slinky on 4 HF bands without external tuning, not all of them. I can match the G5RV on 2 bands without external tuning. This of course led me to trying to find an antenna tuner. It turns out that they are expensive if you want one with good range.
A homebrew antenna tuner

Powered by WordPress