Hi-fix, Hyperfix and Amateur Radio
Because the positioning systems shared the 160-metre band with radio amateurs, an interesting relationship evolved. On the one hand the positioning systems were a source of interference and therefore annoyance, particularly if not properly set up or maintained, when key clicks could be a problem. On the other hand, they could also be a source of fascination and even inspiration...From time to time, parts of units or even whole units turn up at rallies or on eBay and some of them are suitable to conversion for amateur purposes. Particularly prized is the Hyperfix ATU which contains fine vacuum variable capacitors and other components and which may be readily converted to amateur use.
This page is about the amateur fascination with Hi-fix and Hyperfix, and about how system components can have a new lease of life in the hands of radio amateurs.
Firstly, about antennas. Ian Jackson G3OHX lived near to the Seahouses Hi-Fix station in the 1960's. Although a source of annoyance due to it's key clicks, it obviously impressed Ian by how well it radiated its 10 watts or so, and inspired him to copy the antenna design. Although it worked as advertised, Ian wasn't surprised to find that it favoured the ground-wave, which is of course ideal for positioning system use but less useful for long-range communication.
The pictures below show an antenna based on the Hi-Fix design in use during the DXpedition to Rutland in 1965. The bottom of the antenna is standing in a polythene bucket, for the base insulator.
Photographs used by permission of Ian Jackson and must not be used elsewhere without prior consent
Conversion of Hyperfix ATU
I'd be interested to know would happen if the unit were rewired as a pi-match. Anybody done it? Have you converted any other Hi-Fix or Hyperfix kit for amateur radio use? if so, I'd love to hear from you. You can contact me at:
- Best 73's, de Alan G0NFY
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Last update 21/5/05 AC