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Details, datasheet, quote on part number:NCO8207
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Datasheet text preview:
APPLICATION NOTE
Wideband class-A power amplifier for TV transposers in band I (50 - 80 MHz) with two transistors BLV33
NCO8207
Philips Semiconductors
Wideband class-A power amplifier for TV transposers in band I (50 - 80 MHz) with two transistors BLV33
CONTENTS 1 2 3 SUMMARY EXPECTED PERFORMANCE PARTS LIST
NCO8207
1998 Mar 23
2
Philips Semiconductors
Wideband class-A power amplifier for TV transposers in band I (50 - 80 MHz) with two transistors BLV33
1 SUMMARY
NCO8207
The transistor BLV33 is primarily intended for use in linear VHF amplifiers for television transmitters and transposers. In report ECO7904 Mr. Zwanen describes the application of the BLV33 in a transposer amplifier for the TV band III (174 to 230 MHz). On customers request we have made a theoretical design of such a linear transposer amplifier for the TV band I (50 to 80 MHz). 2 EXPECTED PERFORMANCE band I 50 to 80 MHz 17.4 dB ± 0.3 dB 1.25 1.25 30 W 45 W 7.5% IC = 3.2 A/VCE = 25 V
Frequency range Gain Input VSWR Output VSWR Output power POsync at -60 dB int at -55 dB int Cross modulation at POsync = 40 W D.C. setting BLV33
Figure 1 shows the schematic line-up of the complete amplifier and Fig.2 gives the circuit of one BLV33 branch. The applied bias-unit has been described in report ECO7904.
handbook, full pagewidth
VB BIAS CIRCUIT Vb BLV33 BRANCH IN 50 in H1 iso R1 90° BLV33 BRANCH Vb BIAS CIRCUIT VB Vc 0° 0° 90° H2 in OUT 50 iso Vc
R2
MGP955
H1 = H2 = hybrid coupler Anaren type 1A0230-3. R1 = R2 = 50 resistor type Pyrofilm PPR 515-20-3.
Fig.1 Schematic line-up of the amplifier.
1998 Mar 23
3
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