were a real breakthrough in achieving frequency stability in harsh environments that included mechanical vibration,
temperature excursions, power supply variations, and load changes. Use of vacuum tubes made the task even more challenging.
Such oscillators were necessarily very expensive compared to less sophisticated designs. Henry E. Rice Jr., W9YZH,
introduced his "Rice Variarm" model (aka the Millen Model 90700) at a breakthrough price of just $29.50, which in
2013 money equates to $469.89 per the U.S. BLS
Calculator. That is a lot of moola for amateur radio operators even today. The arm sticking out of the case
is for adjusting the frequency.
of Contents]These articles are scanned and OCRed from old editions of the
ARRL's QST magazine. Here is a list of the
QST articles I have already posted. As time permits, I will
be glad to scan articles for you. All copyrights (if any) are hereby acknowledged.
See all available vintage
Something Radically New in ECOs
There are many approaches to the ECO design, most of them having been described in the past; such as expensive,
ruggedly-built h.f. oscillators with their external regulated power supplies, low-frequency dual heterodyne oscillators,
etc. All have their merits, but are necessarily expensive to manufacture and must ultimately end up by selling in
the 50 to 60 dollar price bracket.
A new approach to this problem has been evolved by Henry Rice, Jr., and
was described in detail in January OST. Probably the outstanding feature of the Rice development is its high-performance-per-dollar
which makes possible a factory built commercial ECO with modern performance, complete with tubes, ready to use,
for less than 30 dollars!
Posted November 6, 2013