TM 11-5826-225-35
phase of RF output shifts 180 as the null
points are crossed, accomplishing identical re-
shows the relative phase and magnitude of
loop antenna signals for different radio station
b. The rotor winding output signal of re-
solver B3 is connected in push-pull to the
g r o u n d e d center tap primary of RF trans-
former Tl, T2, or T3, depending on the position
of frequency range and function switch wafer
S1F. Switch S1 is motor-driven through an
1 7. Balanced Modulator
autopositioner system (para 124). Rear switch
wafer S1G, switches the proper center-tapped
secondary windings of Tl, T2, or T3 to variable
tuning capacitor ClB and the base of Q1.
Front switch wafer SlG, connects unused
transformer secondary windings to B+. Trim-
mer capacitors C2, C3, and C4 adjust fre-
quency ranges at the high end of the range
and slug adjustments in RF transformer sec-
ondaries set the low end of ranges. Resistors
R1 and R2 supply bias to Q1 through the trans-
former secondaries and rear switch wafer Sl-
G. The resolver RF output signal of Q1 is ap-
plied to second RF amplifier stage Q3 through
a phase shift network.
16. Phase Shift Network and Second RF
Amplifier
Change 4 17
Previous Page
