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Transmitting




 

The 10-watt 75-meter mobile transmitter is fastened under the instrument panel by means of bilts through holes drilled in the top of the transmitter box.

directly on a spacer, of course. A double-pole antenna/pover change-over relay, K1, is mounted in the space left alongside the tank coil and capacitor. One pole switches the coax line to the antenna, while the other one may be used to switch power between transmitter and receiver or to turn a transmitter supply on

 

and off. The relay used here is a standard 6-volt a.c. relay with a 20-ohm coil. It is actuated by the push-to-talk switch on the T-17 microphone. The microphone transformer is suspended from the top of the box. Small components are grouped around the tube sockets with which they are associated.

Fig.1 -- Circuit diagram of the 10-watt 75-meter mobile transmitter. All resistor are &marc12; watt unless otherwise specified. All capacitances less than 0.001 µf. are in µµf. Polarized capacitors are electrolytic; other fixed capacitors may be ceramic or mica.

C1-C2-Ceramic or mica
c3-140-µ'µ midget variable (Hammarlund MC-140-S or similar.
C10,C11- Electrolytic. K1 - See text
L1 - 32 turns No. 20 enam. 1 inch diam, close-wound

 

L2 - 2 turns insulatedhook-up wire over ground end of L1.
R1-R6- See above
S1 - S.p.s.t. toggle.
T1 - Microphone transformer, single-button carbon (Triad A-5X)
T2 - Combination modulation and speaker output transformer - see text (Triad M-4Z).


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