19th March
2014
written by Todd Harrison

This is (PART 2A & 2B) of the project “Arduino Frequency Display For a Kenwood TS-520S HF Ham Radio”. This part covers small signal amplification of  a 0.2 volt peak-to-peak 5.5 MHz signal into Schmitt triggered NAND gate for cleanup before being cleanly counted by the Arduino. All parts: (PART 4), (PART 3), (PART 2), (PART 1)

(PART 2A)

(PART 2B)

Here are the datasheets for the two chips I used in (PART 2)

74HCT132 Quad 2-input NAND Schmitt trigger (PDF)
NE592 video Amplifier (PDF)

 

Thanks for joining!

Photo Gallery

CLICK PHOTO for gallery view and click a SECOND time for hi-resolution image. Click thumbnails on lower right and lower left of gallery to navigate gallery photos.

Thanks for joining!

Comments Off
6th March
2014
written by Todd Harrison

I attended the Arizona Repeater Association’s (ARA) February 2014 meeting. They had a guest speaker, Byon Garrabrant, presenting what could be called the definitive lecture on Transmitter Hunting. I have broken the lecture up into 4 parts based on content for easier viewing and reference. In general the 4 parts are:
1. What is Transmitter Hunting
2. Hiding
3. Hunting
4. Closing remarks and High Alt. Balloon Tracking.

There will be a large photo gallery after the videos below if you want to see some items in detail.

I want to thank Byon Garrabrant and the ARA for allowing this content to be distributed publicly for everyone to learn and enjoy.
You can find more about the ARA at their website: http://www.w7ara.org
You can contact Byon Garrabrant or purchase his APRS and Fox Hunting gear from his website: http://www.byonics.com

What is Transmitter Hunting or Fox Hunting All About

Transmitter Hiding and Transmitters

Transmitter Hunting and Receivers

Closing Remarks and High Altitude Balloon Tracking

CLICK TO READ ALL —>: (more…)

Comments Off
23rd February
2014
written by Todd Harrison

This is a video showing how I turn a 27 inch TV into a small box of the most reusable components. Yes there are a lot more parts you can salvage from such a TV but in this case I needed to get the TV out of my lab so I just chopped out the best bits that I know I’m always looking for when building projects. Using a metal shears makes short work cutting the printed circuit boards (PCBs) and extracting just the components of interest. The de-solder work can be done when I need the part(s) or on a rainy day with more time.

 

CLICK TO READ ALL —>: (more…)

Comments Off
Previous
Next
  • Visit Our Sponsor: MROSupply.com - An e-commerce site of Mechanical Drives & Belting