This page provides a library of technical references, based on Kachina club meeting presentations and other topics.
Presented by Jim Mortensen, W7AZY, Feb. 11, 2020
Presented by Randy Beecroft, W7RJB, April 9, 2020
Provided by Randy Beecroft, W7RJB, February 2021
If you like building good antennas, this one is for you. The J-pole is a slim, omnidirectional, half-wave antenna fed at the end through a quarter-wave shorted transmission line. Its predecessor is the famous “Zepp” antenna developed for the Zeppelin airship. Both antennas have served many hams around the globe well. While the Zepp is easy to calculate, the J- pole is not; in fact, a one-percent error can throw you out of the band. However, when calculated properly, the J is an excellent candidate for a base station on the popular 144 to 148 MHz band, with a 1:1 VSWR and good efficiency.
Provided by Vince Cattolica, KA7JOI, May 2020
The Kachina ARC has 4 solar powered “Battery Maintainer” kits for club members use. The document linked below is a set of instructions as to how to assemble and use the contents of the kit.
Solar Panel Kit Instructions
Presented by Randy Beecroft, W7RJB, June 11, 2020
The attachment linked below provides Pros and Cons to help you choose what you want to use. This is by no means all that there is to know about these different types of antennas, but it is a starting point to help you decide what would work best for you. I would invite all of the members to search the Internet and You Tube to gain more in depth information on each type of antenna.
Field Day Antennas
Presented by Randy Beecroft, W7RJB, July 9, 2020
There are a few considerations to make when operating portable and off grid. The attached presentation explores some of these things and hopefully will help you to understand some of the thoughts that go into the decision of choosing a way to power your portable station.
Off-Grid Power for Portable Operations
Provided by Vince Cattolica, KA7JOI, Sept. 1, 2020
Some time ago I was asked by a new ham about how to install a mobile radio in his vehicle. My response to him was something like, do not use the cigarette lighter because the wiring and fuse to the cigarette lighter are, most likely, not designed to carry the load his transceiver will put on the circuit. I then suggested he run a separate circuit directly off the battery to avoid the problems that might arise by using the cigarette lighter socket. I suggested using a separate circuit for two good reasons. The first reason for powering his radio directly from the battery is that he can install and fuse a circuit designed to handle the current he will need for his radio. The other reason for running a separate circuit is that he can operate the radio without having to have the engine running.
Power Wiring for Mobile Radio Installations
The above article discusses the installation of a fuse in the “+” positive cable but doesn’t discuss putting one in the “-” negative cable. Here is some additional discussion of this topic.
One Fuse or Two; That is the Question!
Presented by Jim Mortensen, W7AZY, Jan. 12, 2021
All emergencies are different so there isn’t a real step by step procedure to follow. Responding to an emergency requires monitoring your radio 24/7 and being willing to assist distress and emergency calls. The attached paper provides some additional ideas and recommendations.
Presented by Bill Turley, KJ7GYH, Feb. 9, 2021
Bill’s presentation was based on “Grounding and Bonding for the Little Pistol & Medium Gun” by Ward Silver, N0AX. See the following links:
Presented by Randy Beecroft, W7RJB, March 9, 2021
Winlink is a worldwide radio email service that uses radio pathways where the internet is not present. It is also capable of operating completely without the internet‐‐automatically‐‐using smart‐network radio relays.
Winlink had its origins with the sailing community with email, position reporting and weather information. It now has a substantially broader role supporting emergency and disaster relief communications.
Click on the link below to view the full presentation.
Provided by Vince Cattolica, KA7JOI, April 5, 2021
This article describes the differences between copper and aluminum wiring and the limitations and characteristics of each material for use in electrical wiring. Click on the link below for access.
Aluminum Wiring Article