Larcan TTS250M Technical Manual Download Page 16 | Manualshive

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Summary of Contents for TTS250M

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Page 2: ...vely Cooling is provided by a squirrel cage type blower mounted on the rear of the slide out drawer Air is drawn through a filter in the rear door of the cabinet blown through the amplifier heatsink and exhausted through a grill at the front of the amplifier No provision is made for ducting exhaust air Metering is provided for voltage current and RF power The amplifier is VSWR protected with an au...

Page 3: ...oth stages are biased for Class A operation and each has its own set of three terminal regulators for voltage or current regulation The signal is first applied to a form of variable attenuator consisting of R2 R6 and R12 The first stage of amplification is a CA2842 hybrid IC this amplifier provides approximately 22dB of gain A coaxial cable jumper is provided between this stage and the next to all...

Page 4: ...divides the input into two equal and opposite signals Capacitors C3 C4 and the associated strip line circuitry form an impedance matching network to the gates of the FETs C1 and C2 are DC isolation blocking capacitors Capacitors C13 and C16 and associated strip line inductors form an output impedance matching network and T2 combines the out of phase signals at the output J2 C14 and C15 also act as...

Page 5: ...P transistor U2 through a Darlington transistor Q3 Short circuit protection is provided by Q1 and Q4 Q4 shunts the drive away from the base of U2 when the output current causes the voltage across R6 and R10 to rise high enough to open transistor Q1 Supply voltage for the IC is via R8 and CR3 from the 30V supply Metering outputs are provided for the supply as well as those for current drawn from ea...

Page 6: ...s Important Ensure that the primary taps on the power transformer are set as near as possible to the nominal on site line voltage Of course the system will operate with other tap settings but the range in which it will work will no longer be as wide Taps are provided for 200 208 220 230 and 242 VAC Once the nominal voltage has been established and appropriate primary tap selected the raw DC input ...

Page 7: ...ive the AGC and VSWR circuits Operation amplifiers U1A and U2A compare the forward and reflected signals to preset levels and provide an error signal to the Pin Attenuator board An additional circuit consisting of U3 acts as a comparator to drive an LED on the indicator board as the VSWR signal rises about the preset level Set up Procedure for Metering VSWR and AGC Circuits Set the AGC MAN Switch ...

Page 8: ...ontactor AC is fed to the transformer of the power supply as well as to 6F1 and 6F2 in line with the amplifier blower The contactor is energized by a solid state relay 6Z1 Interlocks are provided for the amplifier thermal cutout as well as an auxiliary interlock for customer interface The 12V from the exciter is applied through the REMOTE LOCAL Switch directly in the LOCAL position or when in the ...

Page 9: ...ons are listed in the table on the following page FUNCTION CONNECTION AUX INTERLOCK 6TB3 2 REMOTE CONTROL 6TB3 3 REMOTE TELEMETRY 65V SUPPLY 6Z2 TB1 6 REMOTE TELEMETRY 30V SUPPLY 6Z2 TB1 5 REMOTE TELEMETRY FWD POWER 6Z2 TB1 4 THERMAL CUTOUT STATUS 6Z2 TB1 1 6Z2 TB1 2 AC LINE INPUT POWER 6TB1 1 6TB1 2 NEUTRAL 6TB1 3 ...

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