January 1969 Electronics World
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
Electronics World, published May 1959
- December 1971. All copyrights hereby acknowledged.
Where else on the Internet other than RF Cafe can you go for a daily helping of electronics-related
material that ranges from the very beginnings of our chosen vocation through to the latest
leading edge developments? That Q is rhetorical of course - and self-serving to boot ;-)
This handy-dandy trick for enhancing the signal on your AM radio appeared in a 1969 issue
of Electronics World. I remember doing this magnet 'tuning' technique on my small,
el cheapo pocket transistor radio that I carried with me when wiring houses and buildings
while working as an electrician many moons ago after high school. It often made the difference
between being able to listen to my preferred Top 40 AM station (combo top and music at
the time) in Annapolis, Maryland - WNAV
- and having to settle for Public Radio concerts. The 'NAV' part of WNAV probably derives
from 'naval' both due to the U.S. Naval Academy being there and the fact that the entire Annapolis
area is very water-centric, being located on the Chesapeake Bay and multiple surrounding tributaries.
I do not miss the
long, hot, extremely humid summers of boyhood.
BTW, since I still listen to AM radio part of the day, I grabbed a magnet and ran it along
the area where the internal AM ferrite rod antenna is located in my 1970s vintage
Magnavox Model 789 AM /
FM / Shortwave radio (it was Melanie's when she was a teenager) and sure enough, I was able to locate a peak in reception. Incredibly,
I am able to use it daily to listen to WJR out of
Detroit, which is 150 miles away in a straight line across Lake Erie.
More Sensitivity From Your Transistor Radio
By John E. Campbell
Have you ever wished that you could squeeze just a little bit more sensitivity from your
transistorized AM broadcast receiver, especially on a single station? If so, a gentle wave
of a magic wand may make your wish come true.
All you will need is a permanent magnet and your receiver. If the magnet has a fairly strong
field you won't even need to open the case of your set. Just tune in the station you wish
to "perk up" and make a slow pass with the magnet down the length of the built-in ferrite
antenna rod. If you detect a rather sharp increase in volume anywhere along the line, slow
down and find the peak. That's all there is to it. You can now either balance the magnet where
it is, tape it in place, or obtain some small ceramic magnets and tie or glue them in position
directly on the ferrite rod.
Suitable magnets are available from Radio Shack, Edmund Scientific Co., and many others,
A more universal supplier may be your local hardware dealer who handles magnetic cabinet latches.
Just about any magnet will do as long as the field is strong enough to saturate a small portion
of the ferrite rod.
Posted June 23, 2017