[AMRadio] RE: 160m AA5 receiver to AM Xmtr project

Phil LaMarche plamarc1 at verizon.net
Thu Oct 30 12:22:43 EST 2008


What a wonderful story. My mind flashed back to the 1940's and building a
Xtal radio that I listened to every evening and ended up getting my license
at age 10.  Fun for the rest of my life.


Philip LaMarche 
LaMarche Enterprises, Inc.
800-395-7795 pin 02 
FAX 727-937-8834 
NASFT 30210 

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of LEE BAHR
Sent: Thursday, October 30, 2008 1:02 PM
To: ne1s at neandertech.com; Discussion of AM Radio in the Amateur Service;
glowbugs at piobaire.mines.uidaho.edu; sbjohnston at aol.com
Subject: Re: [AMRadio] RE: 160m AA5 receiver to AM Xmtr project

When I was in the 6th grade, I used to take my mother's AA5 radio part
constantly and then put it together again.  (It used octal tubes).  I read
in an article about a "new" ferrite magnetic antenna".  I ordered one from
Burstein-Applebee in Kansas City.  It was a small coil with an adjustable
slug for resonance.  I hooked it up to my AA5 radio and it worked great. 
better then the loop on the broadcast band.  Then I discovered if I pulled
the slug out of the coil, the coil was now tuned to the 75 meter ham band. 
Apparently the second harmonic of the AA5 oscillator was now mixing with the
75 meter phone signals and producing a 455 khz signal.  It worked great!  75
meter AM stations came in loud and clear.  When I wanted to give the radio
back to my mother, I simply peaked the antenna "loopstick" antenna back on
the broadcast band.


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