Last updated on
Thursday, May 19, 2022 04:37:22 PM Mountain US Time Zone


Near real-time Solar-Terrestrial band propagation data.

Band Chart
International Call Sign Series
Alpha Codes
Morse Code Chart
QRZ.com database     eHam.net

Icom IC-7300 HF/50MHz SDR Transceiver (Japan).
For an entire given band, the waterfall display
shows a Fast Fourier Transform (FFT), over time.
Icom IC-7300 Brochure
Icom IC-7300 Full Manual
Icom IC-7300 Basic Manual
Icom RS-BA1 Version 2 Remote Software

The Icom SP-38 Speaker that matchs the IC-7300.

Icom SP-38 speaker 
Icom SP-23 Speaker Instructions
Icom SM-30 Microphone Instructions

Power Supplies (PS)

Astron Corp (USA) VS-35M-AP linear PS.
Variable, 35A at 13.8VDC peak output; 25A
continuous. Precision regulation, adjustable
from 2 to 15VDC. Adjustable current limiting.
Separate lighted voltage and current meters.
Short circuit & over-voltage protection.
Low peak-to-peak ripple of less than 5mv.
High surge capacity. Fold-back current limiting.
Front panel Anderson Power Pole Connectors.
Large heatsinks for cooling; no fan noise. 
Grounded power cord. External fuse access.
VS-35M-AP Instructions

Samlex SEC-1235 (USA) desktop power supply, switching. Input: 120
VAC/230VAC internally set. Output: 13.8 VDC, 30 A
SEC-1235 Instructions

Anderson Power Pole Connectors
Anderson Pole PWR Crimp Manual

Vectronics DL-300M Dummy Load

Iambic-S paddles 
Keyer cable made from a heavy-duty audio stereo patch cord.

Vibroplex Iambic Diagram
Vibroplex Iambic Parts List
Vibroplex Iambic Adjustments

Icom AH-4 Automatic Tuner

The Icom AH-4 very quickly tunes to lowest possible SWR. It
seamlessly integrates with the IC-7300's internal tuner controls. In
the box: 17' of antenna coax, 17' of 4-wire+grounded shield remote
control cable, SS mast hardware, PL-259s, AH-4 unit, & instructions.
Icom AH-4 HF+50MHz Automatic Antenna Tuner Instructions

Icom AH-4 wire lengths to avoid calculation xls spread sheet

Inside the Icom AH-4 auto tuner.
Icom AH-4 Auto Antenna Tuner Design & Operation

Comtek current feedline choke, in-line 1:1 balun, 50 ohms,
1.8-54 MHz, mix of 75 ferrite beads on PTFE coax, PL-259s.
Placed where the coax exits through the outside wall. Used
to limit tuner's counterpoise to 17' & lower RF in my shack.
In my case, this combo yields very low SWRs on all bands
(except 160m) using an end-fed, 45' inverted-U, 26ga wire.
8 gage ground wire was later connected to a 33' steel railing
for a larger ground plane. SWRs dropped lower on 80m-6m;
many 1:1. This antenna design is due to space restrictions.

Digital Radio

WSJT-X is a computer program designed to facilitate
basic amateur radio communication using very weak signals. 
The next generation HF Software Defined Radios (SDRs) e.g.,
the Icom IC-7300, use their USB digital data interfaces to
implement WJST-X. WSJT-X communication protocols or
"modes" called FST4, FST4W, FT4, FT8, JT4, JT9, JT65, Q65, 
MSK144, & WSPR, as well as one called Echo for detecting &
measuring your own radio signals reflected from the Moon.
These various modes were designed for making reliable,
confirmed QSOs under extreme, weak-signal conditions.
With my modest, compact antenna system, nestled in the
Rockies foothills, I have made contacts from Golden CO
to: Australia, Japan, Hawaii, Vancouver, Ottawa, Toronto,
US States, Cuba, Columbia, Brazil, Azores, Canary Is.,
Puerto Rico, UK, Scotland, Spain, Greece, Macedonia,
Italy, Germany, Switzerland, Netherlands, Norway,
Austria, France, Hungry, Finland, Croatia, & more.
WSJT-X User Guide

Multi-hop sporadic E propagation. FT8 FSK Modulation
can complete communications -21dB below the noise
floor. CW would have to be 10 to 15dB higher.

GridTracker     GridTracker User's Guide

My first license, followed by WB8CBV then WA8RTC.

My first rig, a used National NCX-3. $200 circa 1965.
National NCX-3 Brochure
National NCX-3 Transceiver Manual
NCX-A Power Supply Manual

My first bug, a used Vibroplex Blue Racer Deluxe. $10 circa 1965.
Vibroplex Bug Adjustments
Vibroplex Blue Racer Diagram
Vibroplex Blue Racer Parts List