All articles published in SIGNAL magazine

All articles published in SIGNAL are presented on this page. In some cases additional links to sites relevant to the text are included. Kindly note that links are also shown in the articles themselves.
A great thank you goes to the publications manager of VMARS and editor of SIGNAL, Prof. Bronek Wedzicha, M0DAF for his excellent layout work and all improvements of my "non-native" English.

Czech R5 HF receiver: made in GDR as EKB

This article covers in detail this interesting portable/mobile receiver. It was designed during the transition from battery and subminiature tubes to germanium transistors - employing all three to achieve the required performance. The complete text with pictures published in SIGNAL 64:

Swiss military HF-LF receiver E44

The article starts with the history of this receiver during the diffcult times of encircled Switzerland in WW2 and describes the receiver itself, the resources mobilized to manufacture it in 1944/45 and the restoration back to a working unit. The complete text with pictures published in SIGNAL 59 and an extended version with more pictures published in HISTEC Journal:

The portable military Rohde & Schwarz ESEF VHF receiver

This text describes the author's receiver originally purchased in 1963 as a tunable IF for a 2m amateur band converter. After many years it was reactivated and after minor work in excellent condition. The complete text with pictures published in SIGNAL 57:

The Bendix RA-1B aircraft radio receiver

The text presents the full restoration of this receiver made in the 1940ies including a real dynamotor supply and an installation on an aluminum plinth. The complete text with pictures published in SIGNAL 56:

400Hz inverters for air-borne radios

This text presents the requirements and possible solutions for the task of providing 400Hz AC power to aircraft radios. Part 1 covers introduction and data of commercial units and explores and documents an experiment using a "simple" PWM inverter. The results are usable but not really satisfactory. Part 2 was intended to describe an inverter based on a modern "HF" concept using an available driver module (from China) to gate a MOSFET bridge. This reflects current inverter design but my project has unfortunately not proceeded as planned. Sorry. The complete Part 1 text published in SIGNAL 46:

Bendix RA-1B receiver, speaker and power supply on a plinth → click on picture to read article published.
RA-1B on plinth