The Quantar First Generation UHF Power Amps cover UHF R1, R2, R3 and R4. R0, 380-433 MHz, was a slight redesign, and it is covered else where.

Basics

The Basic module is pictured below.

First Generation PA Layout

The major parts of the PA are

Printed circuit board
Intermediate PA
Final PA
Circulator
Low Pass Filter

Each of these parts varies depending on the range of the PA.

Band	IPA	FPA	Circulator	LPF
R1	TLE9150	TTE6321	5884911T04	TTE6331
R2	TLE9150	TTE6322	5884911T04	TTE6332
R3	TLE9160	TTE6323	5884911T18	TTE6334
R4	CLE6090	TTE6342	5884911T18	TTE6334

The IPA module is a 10 W output that feeds into the FPA. Note the schematic diagram has some errors on it regarding a 30-35W output from the IPA. This is an error as it's from the 25W UHF PA diagram.

The FPA module consists of two parallel PA strips with two FET's each for a total of four devices. Each strip is addressed as "A" and "B" in the radio for the current monitoring of the PA.

Unfortunately there is no diagram of the IPA or FPA modules.

Note there is no CPU or even much digital circuitry in the PA. All metering is done via the exciter CPU mostly using an analog input and switches (U4103/4) to switch this input between different voltages on the PA.

The exciter controls the output power by an analog output (V_CONT) 0-5v from the CPU. This voltage is then used to control a couple transistors (Q4100 & Q4101) making the V_OMNI voltage that varies the first stage in the Intermediate PA.

The complete schematics are PNG format and are also available as a PDF