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AA7 • 14
Unusual oscillations in receiver: Some portable receivers not enclosed in
metal cases may break into oscillation when connected to any RF
preamplifier. Try reducing the AA7 gain control and make sure good
grounds are on the interconnecting coax cables.
Receiver overloading, heterodynes, images:
A preamplifier will intensify
any problems with selectivity and image rejection due to poor receiver
design.
ACTIVE ANTENNA COMPARISONS
The author of this AA7 instruction manual has conducted extensive side-
by-side comparisons of the AA7 with the Heathkit HD-1424 and MFJ
Enterprises, Inc. Model 1020A active antennas, both of which have band-
switched tunable preamplifiers as well as an understandably higher selling
price. If all three units are compared, each using only its on-board whip
extended to equal heights, the two tunable units do produce a stronger
signal. We would hope so! However, attaching about two more feet of wire
to the AA7's whip resulted in it delivering the strongest signal. Similarly,
increasing the antenna lengths of the other units resulted in increased signal
strength. It becomes a question of how much you wish to pay for the shortest
possible indoor antenna! The AA7's competition performs well, but we are
sure you will appreciate the AA7's versatility and budget pricing.
THE AA7'S ENCLOSURE: THE FINISHING TOUCH
The Ramsey Electronics custom case, panel and knob kit is optional for
the AA7 as it is for all of our standard major PC-board kits. In it’s case, the
finished AA7 will be attractive and virtually indestructible, so that the world of
radio can be at your fingertips wherever you go. Use of our factory enclosure
also enhances the resale value of your AA7.
A FINAL SUGGESTION
A small antenna is most effective whenever it can be outdoors and clear of
any surrounding metal building structure. You may wish to use a mix of
personal ingenuity and hardware store/junk-box parts to make a simple
remote whip that can be quickly mounted on windows, windowsills, balcony
rails, or handy points on cars, RVs, etc. We hope you will enjoy your AA7 in
a wide variety of listening and monitoring situations.
Kit building is FUN! Ramsey has a wide variety of nifty kits. Ask for our free
catalog, where there are plenty more kits ideally suited for you!