[Hallicrafters] antenna

[Mike Everette]

For general receiving I'd just put up a long wire, say
from the eave of the house to a convenient tree.  You
could put a rotary switch in the line to select which
radio you wish to use, and just feed each of them with
a single piece of wire.

Don't forget lightning protection.  The simplest is to
put a knife switch in the line -- OUTSIDE the house --
to disconnect the antenna from the radios and run it
straight to ground.  Always leave the antenna grounded
except when you are using the radios.

If you leave the antenna connected during a storm,
current can be induced into the wire from nearby
lightning -- enough to burn out an antenna coil.  It
does not need to be a direct strike.

BE CAREFUL with that S-22R (or any other radio with an
acey-deucey power supply)!!!

There are 3 capacitors in the S-22R, all 0.25uf,
between the chassis itself and the "electrical"
ground.  There is another, a 0.002 or 0.005 uf, from
the hot side of the line to the chassis.  BE SURE you
have changed all these and replaced all of them with
something rated for AC.  If you don't you are
GA-RON-TEED to get lit up (been there, done that, not
fun -- happened before I recapped the radio), and you
may not need a radio to listen to the celestial
voices.

Also be sure you either replace or remove altogether,
all the power line bypass caps in the
transformer-operated radios, or you may get lit up (or
at least tingle-ated) if you touch two of them at the
same time.  These old caps LEAK!  And in the SX-110,
get rid of that 470K resistor from one side of the
power line to ground (who knows what the designer was
thinking when that was specified!! Duh!).  If you
replace the caps, use parts rated for at least 1000
volts AC so they will withstand surges.  (In the
S-22R, the aforementioned capacitors must be in the
circuit).

Bond all the radios together for common ground -- but
BE SURE, before you connect the S-22R to the ground
system, that the radio is plugged in such that the
chassis is not hot!  Best way to avoid this is to use
a 3 wire cord.  Connect the black lead to the supply
side of the circuit (so it goes to the rectifier), the
white lead to the chassis, and the green lead to the
ground terminal on the antenna strip.

73

Mike
WA4DLF




		
__________________________________ 
Yahoo! Mail Mobile 
Take Yahoo! Mail with you! Check email on your mobile phone. 
http://mobile.yahoo.com/learn/mail