Ultra Cheap 440 MHz HAM Radio Yagi

I’ve recently been playing with a pair of low-power 440MHz UHF data transmitters (side note these are very cool and ultra cheap 100mW UHF radios) and needed to build a pair of 440 MHz directional yagi antenna to extend the range.


I stumbled upon this write up on Radio Reference about a guy who built a yagi antenna from old clothes hangers and a broom stick.

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First Tomato Harvest

Our first crop of tomatoes was ready!  Check out the pictures below.

The first feedback from the green shoulder tomatoes are that they taste “sweeter” and “less acidic”  We’ve only had a few of those so far, but some have gotten quite big.


Most of the tomatoes that were ready are romas, and the mother in law has enough to start canning!

20150815_130312 Continue reading

Eastern Iowa Yeasu FT7900 Programming

Hello everyone, please find attached to this post my latest 2015 Programming File for the Yeasu FT7900 / FT8900 Radio.  This is in Chirp format.  This includes all repeaters I am aware of in eastern Iowa and western Illinois.

Covers Washington to Waterloo, Van Horne to Joliet.

Separate memory banks are used to keep each service and location separate for scanning.

Bank 1 = FRS / GMRS (RX Only)
Bank 2 = Air & Train (RX Only)
Bank 3 = Ham Simplex and Cedar Rapids/IC repeaters (incl Muscatine and SE Iowa)
Bank 4 = Ham Simplex and Quad Cities Repeaters
Bank 5 = Ham Simplex and Waterloo / NE Iowa
Bank 6 = Business and Hotels (RX Only)

Download 2015-08 FT7900 Programming KC0AKY

Updated Signal Check Database

Hello everyone, here’s an updated Signal Check Pro database dump covering Sprint towers.

Mostly Complete
Linn County, Johnson County

Partially Complete
Cedar County, Butler County, Muscatine County, Mercer County (IL)

Please feel free to email me with your own updates to the database, if you identify sites I’ve not yet captured, please do send me an email with the information and I will get it added to the next database update! Continue reading

RTL-SDR Based LTE Signal Analyzer

Have you ever wanted to detect what network is installed at what tower?  screenshot_01Interested to see how a network upgrade or overlay is progressing?  Or, maybe you are interested in getting a better idea of the relative signal strength of multiple LTE networks, with a passive receiver?  If so, this is the blog post for you.

This post will explain how to build a custom application for the Kali Linux system which will allow you to use a RTL-SDR DVB TV tuner chipset to perform spectrum analyzer functions on LTE signals.  Using the E4000 chipset, I have decoded LTE signals in 700MHz, 800MHz, 1900MHz (PCS) and 2300MHz (AWS) frequencies. Continue reading