olivia mode

Horizontal Loop for 80 meters - Modelling an horizontal Loop antenna at 3.5 MHz

Baluns in antenna systems - Understanding Baluns. This article explores some simple antenna system configurations and the effect of key system components, connections and dimensions on feed line common mode current.

Folded dipole ZL Antennas - Simulation and modelling the ZL Special antenna

A Dual Mode Horn Antenna - Dual mode horm antenna for 10 GHz nu G3PH0

Jpole antenna Modeling - Using NEC4WIN for Jpole antenna modeling

Using MMANA-GAL for antenna modelling - G0KYA MMANA-GAL presentation and samples

T Match efficiency estimator - This calculator estimates the efficiency of a T match tuner using a simple loss model.

Modern Military Radios and the Ham Operator - What Military Configurations offer as Diversification to our Hobby

H40FN H40FK Temotu WebSite - H40FNoperated by DK9FN and DG1FK using H40FK in digital modes

Digital Radio Modes - Sounds - Sounds of the hf digital radio modes

K-Y Filter Company - Modem Telephone Super Filters For HF and AM Radio Interference.

Ham Radio Digital Modes Information - WB8NUT digital modes information page with various digital modes description and sound samples

Data Communications - Digital Modes - Summary of digital modes, description of several operating modes, with sound samples by Highfields ARC

HSMM Experiments on the 6M Amateur Band - Progress Report on VHF OFDM Modem submitted by John B. Stephensen, KD6OZH ARRL Pdf file

Amtor Digital Mode - About AMTOR Amateur Teleprinting Over Radio

Amtor mode - Information on Amtor mode with protocol details

Amtor the forgotten digital mode - N4ZOU Article on AMTOR mode on eham.net

Hell Formats - Here is a simple definition of all the Hellschreiber modes

Baycom modem schematic - A 1200 baud Baycom modem schematic by SP3EJJ

Yaesu FT-817 review by G3XBM - Yaesu FT817 all band, all mode handheld transceiver article.

FT-920 modifications - Expanded Digital Mode Operating Instructions, MARS/CAP modification for the American FT-920

Experimental 2 Mbit modem - Description of a 2 Mbit Modem project

Common mode current - Balanced and Unbalanced Systems

FT290 CW KOX Circuit - This is not actually break-in but just KOX circuit. It can only be used on the CW mode otherwise it keys up the Tx

PSK31 interface - A simple PSK31/digital interface which can connect your transceiver to a PC soundcard for digital modes.