Article and experimentation on multiband antennas of traps for 40 meters band
Vertical Dipole Array
A simple and awesome wire monoband antenna, very usefull for portable and dxpeditions usage, consist of two elements, a driver and the reflector. This endfed halfwave gives a very low take off angle and is very suited for chasing DX.
This 1:49 transformer is used with wires any multiple of 1/2 wavelength. This is not a matching network, it’s a wideband transformer and it has some advantages compared to LC matching
PSK Express is a replacement for YGPSK, it is multi-mode and will allow you to use PSK, RTTY or MFSK at various speeds. Requires .Net framework and run under windows, freeware.
A Portable 75/40 Meter NVIS Antenna
This article describes a 75/40 meter NVIS, but one could use the construction techniques to build just a 75 meter or a 40 meter version.
N Type connectors over SO-239 at VHF/UHF
How much better is an N over SO-239 at VHF/UHF, a discussion topic at eham
Multiband trap antennas
Detailed analysis of multiband trapped antennas with references on efficiency, height above the ground, feed lines and total length
Yaesu FT-857 CAT Controller
Free windows basic and simple CAT program specifically for the Yaesu FT-857 radio. It provides an unlimited memory storage area which resides on the client side.
SIM PSK 31
SIM PSK 31/63 (Integrated Structured Message BPSK31) is a digital mode based on BPSK that use a structured predefined coded format to send messages, windows free software developed by Nizar Ben Rejeb
A voice keyer for field day or general portable operations made with the DH8BQA cq machine kit