Old Technology and Methods:
Files from the W7ZOI page.
Earlier times on the Internet produced web pages that were much
smaller. The Internet providers had much less memory for each
customer. Our computers were much slower, requiring much more time
to download even modest sized files. My personal approach was
to periodically eliminate some articles that I had posted in order to make room
for new ones. But times have changed. My personal conservative
approach is no longer necessary, so I'm bringing back some of the earlier
pieces. Some may still be of interest or serve to illustrate a concept.
June 2,
2023 (minor edit, no new files)
RF Signal
Source for the Experimenter April 2012
An Abstract
for Experimental Methods in RF Design (EMRFD) 2003
Some
Bandpass Filter Design Notes (LC Filters.) 6/2003
Breadboarding
Methods 3/2007
Books
7/2009
Experiments
with Coils and Q-Measurements 12/2008
Comparing
Quartz Crystal Measurement Methods 7/2009
Direct
Conversion Receivers--Some Amateur Radio History 3/2019
Calculations
and Simulations with Attenuator Pads and Feedback Amplifiers
8/2006
Experiments
with Simple Low Pass Filters 2/2009
A
Mixed Form Filter: Variatios on Familiar Design
Methods 12/2008
Measurements
on the EMRFD First Transmitter 8/2007
Micromountaineers--Old and New 1/2007
Practical
Tuning and Aligning of a LC Bandpass Filter 3/2021
Building
a Power Meter using the AD-8307 4/2015
A Portable
Antenna Scheme (Perhaps of interest to the POTA
enthusiasts) 7/2007
A Bandpass Filter using Coils Wound on PVC Pipe
10/2008
Return
Loss, Gamma, and VSWR 7/2006
Single Balanced
Mixer Experiments 1/2008
A Single
Conversion Spectrum Analyzer 3/2009
Breadboarding
Schemes for SMT Circuits 3/2004
Transmit-Receive
Methods for QRP Equipment 11/2018
Transformer
Loaded LC Bandpass Filters 4/2009
A VHF
Bandpass Filter 7/2002
Transformers
for the End Fed Half Wave Antenna 5/2017
Experiments
with a NanoVNA 9/2020
Adding a
Q-Multiplier to a Crystal Set 10/2007