The MFJ-940 VERSA TUNER II is a useful little antenna tuner for the HF-bands. However it suffers from a minor design error, which can be easily rectified.As other antenna tuners may show the same kind of “weakness”, the modification described here can be used to improve other types. The connection between the components in the…
Six Meter Wavelength Band Antennas
The advent of new, affordable MF/HF/VHF radios in the last few months from virtually all the major manufacturers, has spurred a migration by more and more Hams to the Six Meter band. I’m often asked, “What antennas are best for Six Meters?”. Before answering a question like this, I must first ask the Ham what…
Stacked Yagi Antennas
This article was obtained from VE3GK experiences, constructing and designing full size, single band stacked yagi antenna arrays, special rotating, electric powered, telescoping towers and rotators. All the test results are from first hand experiments. VE3GK kept a record of these experiments and construction details and offer them for your interest. HISTORY I started out…
Ameritron AL-80A restoration project
W7TDC article on restoration of the AL-80A RF amplifier. The Ameritron AL-80A uses a single 3-500Z triode to produce over 1KW of power with only 65 watts of drive. I purchased it in the beggining of July 2003. It had several problems when I got it. The tube was bad, a VHF parastitic had occurred,…
WinPSKse
This free application developed by KA1DT is no more developped but still offer interesting features and is just 970Kb. Download WinPSKse v 2.23
AM Antennas
An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes advantage of the resonant properties of aninductor and a capacitor connected in parallel to receive weak AM stations. The “loop” part of the antenna is the inductor, and thetuning capacitor makes it resonate at a desired frequency.
Kenwood Smart Memory KSM
KSM Kenwood Smart Memory is a program to read and update the memory channels of a Kenwood amateur radio. The current supported types are: TS-450S, TS-570D, TS-570S, TS-690S, TS-870S, TS-940S,TS-950S. Software by PP1ETL has changed various download sites during years. Kenwood radio memory manager software to manage kenwood radios memories can now be Downloaded from here
J-Pole Antennas
About J-POLE ANTENNAS by Mike Walkington, VK1KCK The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which…
5 Element full size Yagi for 20 meters
The following are construction details of a 5 element 20 meter monobander antenna originally published by VE3GK. However, this particular yagi was run through a computer program and performed very well. It was also scaled to 70 cm on a test range by the late VE3UD, Bud Punchard and the results compared with the computer…
TS-870S Remote control
Freeware Kenwood TS-870 Control Program developed by EC4DFP Download TS-870S.Zip (1.7 Mb)