Misc.
VHF/UHF/Microwave/Light:
The KA7OEI
Microwave page - A page with some details of
microwave-band
amateur radio
operations and equipment, including 10 and 24 GHz.
KA7OEI Optical Communications page - This page has information about through-the-air optical ("lightbeam") communications using various types of light sources It is linked from the modulatedlight.org page.
Comparison
of coherent versus nonconherent light for transmission of audio on an
atmospheric path - Did you even wonder if the
phase-coherence of Laser light might impede the effective transmission
of
amplitude-modulated intelligence on an optical communications circuit
over an atmospheric path, and whether or not noncoherent light may
provide superior performance under similar conditions? I did, so
I decided to check it out...
Weather Satellite Page - Some time ago, I decided to build a VHF Weather Satellite receiver from scratch - that's to say not from a kit. I'm still working on a web page that describes it, but in the meantime, here's a link that will lead you to pictures received using this homebrew gear.
A
product
review of a yagi - This page describes
in some
detail a yagi that a fellow amateur radio operator bought on
Ebay.
It would be true to say that no antenna performs nearly as well as this
antenna!
Direction Finding
(e.g.
"DFing"):
KA7OEI ARDF
page - This page provides a
point-of-reference
for various Amateur Radio Direction Finding topics - particularly for
pages relating to the Montreal I, II and III
Doppler
DF units by VE2EMM - including "alternate" firmware for those units
that can provide additional functionality. There is also
information on a simple PIC-based TDOA unit.
LowFER/MedFER:
The "CT" MedFER Beacon - page - a description of a PIC-based PSK31 MedFER (Mediumwave Frequency Experimental Radio) beacon on 1704.9something KHz.
QRSS and
You... -
This page explains QRSS (extremely slow CW) its advantages, and how
to use it to receive weak/distant signals. It is somewhat dated,
but you may still find it useful.
Using
your
computer to ambush unsuspecting NDBs - This
page describes
a bit about NDBs and their properties and how one may use a computer to
aid in their reception. This is also somewhat dated, but it also
may be useful if you are learning how to use the Spectran program.
A
Line-Synchronous
Noise Blanker for VLF/LF/MF use - This is a noise blanker
designed
to attenuate noise generated by line-operated devices (light dimmers,
etc.)
Special attention has been paid to the design to minimize broadband IMD
produced
by the blanking action.
The KA7OEI FT-817 pages - This collection of pages describes in some detail the inner-workings of the FT-817, as well as various things that can be done to improve the performance of the transceiver.
The KA7OEI GPS page - This page talks a bit about using an HP3801A GPS receiver as a time/frequency reference.
The NiCd/NiMH page - This page describes in some detail the care and feeding of NiCd and NiMH cells and batteries. This explains how to keep NiCd cells going, and what that "memory" effect really is! (Hint: It's not the "memory" effect at all!)
Clint's
Friendship
Cruise page - This talks about a public
service event
where we set up temporary repeaters to cover a large geographical area
in some of the most rugged terrain in the U.S. This page talks
specifically
about those areas in which I have been directly involved.
The Cycloid
Dipole - Developed for use with the WA7X
beacon, I derived
2 and 6 meter versions of the "Cycloid Dipole" - an odd-looking antenna
that exhibits omnidirectional, circular polarization radiation patterns
at the horizon.
Restoring my Atwater Kent Model 20 Compact receiver - This page describes how I restored an old Atwater Kent Model 20-C receiver to operating condition - and how it was used for NDB reception!
Other misc. pages
maintained
(in whole or in part) by me:
modulatedlight.org
- This web site has information about through-the-air
optical
("lightbeam") communications using various types of light sources.
The Repeaters of the Utah Amateur Radio Club (UARC) - This page has detailed information about UARC's repeaters, and plans to improve those repeaters.
The Utah VHF Society
page - This describes the purpose of the VHF
society, and tells a
bit about the repeaters/systems/clubs that are affiliated with it.
Miscellaneous
miscellany
(that is, things that don't fall into the above categories...):
The Cybernator - This is a device that may be useful in the field of speech therapy: Get this for a person that talks too much, too little, or just likes the sound of his/her own voice!
A
Cold-War Mystery - In the mid 1950's, after
an above-ground
bomb test, this boat limped into Truk lagoon: What happened to
it?
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The various trademarks and names (e.g. "Icom," "Kenwood," "Osram," "Pictiva", "Atwater Kent," etc.) used on this page are the property of their respective owners and no endorsements are expressed or implied.
This page maintained by Clint, KA7OEI.
Last update: 20100727