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From a discussion with  OM Curt Kolovson (W6RQ),  who wants to use his
» TG-5-B «  as a MORSE-TRAINER,  we came to the following SOLUTION ...
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 o  No [BA-2] Line-Battery
 o  No [2BA-30] Local 2 x 1.5 Volt Batteries ...
    ... INSTEAD: Connect ( on front ) Ports (+) & (-3) with
        a 6 Volt (= 4x1.5 ) PACKAGE or a 9 Volt BLOCK
 o  CONNECT PORTS (L2) === (-3)
 o  Hit the MORSE-KEY ........... and
    set RECEIVER-RELAY appropriate ...
    until the  B E E E P s  are clear and separated

COMPARE THE WIRE-DIAGRAM:
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This configuration let the MORSE-KEY be in loop with the RECEIVER-RELAY
and 6 ( or 9 ) VOLT PACKAGE. When the MORSE-KEY is hit, the CONTACTS of
the RECEIVER-RELAY are activated and the BELL chimes ( or a "BEEEP" can
be heared in the connected HEADPHONES instead ).

R E M A R K S   T O   M A I N T E N A N C E   I F   N E C E S S A R Y : 
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 o  Clean CONTACTS of RECEIVER-RELAY with a strip of fine sandpaper
 o  Wiggle CENTRAL CONTACT: Its position is critical !!!

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© C.HAMANN         http://public.BHT-Berlin.de/hamann        * 01/02/18