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Amateur Radio Station KJ6YVT

The subject of the photograph above is a Marconi Multiple Tuner of 1907 vintage.  These were used during the wireless spark era aboard ships such as the R.M.S. Titanic.  It is evident that I am very pleased to be holding one of the first pieces of electronic apparatus used to tune electromagnetic waves.

R.M.S Titanic Marconi Room


Electronic technology has progressed significantly since 1907!

The iCOM IC-7800 transceiver is an artistic fusion of over 40 years analog RF circuit development expertise and cutting-edge digital technology.  The result is TWO identical receivers with 110dB dynamic range, +40dBm 3rd order intercept point, and unmatched Digital Signal Processor technology in the HF bands, something that has never been achieved in Ham radio!  Simply put, iCOM has developed the ultimate Amateur HF transceiver.  No one else comes close!

Two receivers means you can use two antennas to implement diversity reception; when the signal fades in one antenna, it often peaks in the other.  Even if you've got one of those technically advanced SteppIR antennas, it alone won't eliminate signal fading (QSB).

December 2013 UPDATE:
New icom V3.0 Firmware adds 25 new functions to the IC-7800:

Waterfall screens, point-and-click mouse tuning operation, and other additional functions on the bandscope have been added.

An audio scope function has been added.

IC-7800 Display with new point-and-click waterfall
Mini spectrum scope and audio scope


The USB connector now also accepts USB flash drives and/or a USB mouse.

The Voice Recording function recording time has been increased, and now can support SD memory cards. Transmission recording capability has been added also.

Remotely control the transceiver without needing a Base (server) PC.

Send e-mail to: KJ6YVT



Radio Propagation Forecasting

High Frequency Propagation Prediction and Ionospheric Communications Analysis
Click the link above to launch the VOACAP HF Propagation tool.


1.) Dropping geomagnetic field indices numbers are better, Kp of 0 best.

2.) A daily sunspot number of 150 or higher, 200 or higher best.

3.) A daily sunspot number of greater than 100 for routine stable formation of the E Valley/F Layer ducting mechanism.

4.) Previous 24 hour Ap index under 10, fewer than 7 for several days consecutively are best.

5.) Previous 3 hours Kp index fewer than 3 for mid latitude paths, fewer than 2 for high latitude paths, 0 for several days consecutively is best.

6.) Energetic protons no greater than 10 MeV (10+0).

7.) Background x-ray flux levels greater than B1 for several days consecutively, greater than C1 best.

8.) No current STRATWARM alert.

9.) Interplanetary magnetic field (IMF) Bz with a (positive number) sign, indicates a lesser chance of high latitude path aurora absorption/unpredictable refraction or scattering of medium frequency RF signals, when the Kp is above 3.

10.) A -20 or better towards a positive number Dst index during the recovery time after a geomagnetic storm, as related to the equatorial ring current. A positive number is best.

11.) Rising positive T index number. The T Index tracks with the F2 layer critical frequency (foF2) and sunspot number (SSN) and indicates the capability of the F2 layer to refract RF signals.

NOTE!!! The propagation indices "interpretations" are my personal intellectual property. Therefore the propagation indices interpretations contained herein is copyrighted 1988-2012 by Thomas F. Giella, NZ4O, all rights reserved. Reproduction of information herein is allowed without permission in advance as long as proper credit is given.

Environmental Factors That Affect Amateur Radio Signal Propagation

Solar X-rays:

Geomagnetic Field:

From n3kl.org




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Daily MF/HF/6M Frequency Radio Propagation Forecast

Live DX Log

Solar Terrestrial Activity Report

Solar Influences Data Center

Yohkoh satellite X-Ray photo of sun

Real Time Maps

Real Time Radio Propagation

Band Spots

Real Time Band Spots

Worldwide DX Club

HF Propagation and Solar-Terrestrial Data

Predicted Sunspot Number And Radio Flux Values

ITU Callsign Prefix List

Create Azimuthal Map



U.S. near real time lightning strike data:


A global view of near real time lightning strike data:





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Copyright: L. Dighera, 2012; All Rights Reserved: LDighera@att.net