[AMRadio] Hallicrafters SX-24 coil winding information

Mike Dorworth,K4XM k4xm at arczip.com
Mon Apr 18 13:16:50 EDT 2005

Without a GDO you can use a wavetrap on the Broadcast band. Put the circuit
in the antenna and tune coil for null at low end of band with full cap. The
ARRL L/C/F/ Calculator, formerly known as the Lightning Calculator calls for
about 175 microhenry, on a three quarter inch form, it would take a winding
length of 7/8 inch at about 145 turns per inch of no. 34. Hope this helps..
73, Mike, K4XM

----- Original Message ----- 
From: "Bill Fondren" <bill.fondren at sbcglobal.net>
To: <amradio at mailman.qth.net>
Sent: Monday, April 18, 2005 12:10 PM
Subject: [AMRadio] Hallicrafters SX-24 coil winding information

> I need help     I have a old Hallicrafters SX-24 that the broadcast band
coils, both osc and antenna coils are gone. For some reason the mice only
got those 2 coils and the old set works pretty good on all the other bands
so I would like to wind new coils and get the broadcast band working. My GDO
does not have the BC band on it so its no help.  I installed a universal osc
coil that seem to work but I cant seem to get the ant coil right.  I have
used formulas on the web and get about the same number of turns for the
windings.  The coils are wound on 3/4" form, the tuning cap is 440 mmfd.
with 4 mmfd of trim across it.  I am using 34 gauge wire and the formulas I
used says to use 130 turns for the secondary of the ant coil.  I used about
50 turns for the input coil.
> Any help or suggections would be appreciated.  I also have the HT-9
transmitter and would like to get the  1939 station back on the air.
Thanks    Bill Fondren   K5PML
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