TPL Communications 3-2AB-A User Manual 82833
TPL Communications Inc 82833
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9“; /7 ENGINEERING, INC. "One War/d, One I "CS/11min" ” January 14, 1999 Linda Elliott Q I“: ; FEDERAL COMMUNICATIONS COMMISSION @ 7435 Oakland Mills Road ”I Columbia‘ MD 21046 Re: Reference #4902 Dear Ms. Elliott Following please find the service manual as requested in your fax dated November 19, 1998 for TPL Communications, Inc., FCC ID: BBDZLJAB-A. The original will be mailed this evening. If you have any questions please do not hesitate to call. ,/ ron Gardner Test Dept Secretary hum]: Family awned and operated since 1979 3535 W. Commonwealth Ave ' Fullenon. CA 92833 ' Ts], 714/87[L77Sl - Fux 7 I4/R71L503l ' www.dnb€ng\nc.com mm. 7,771 COMMUNICATIONS SERVICE IWANUAL AIRBAND RS3-2AB-AIR RS3-2AC-AIR RF POWER AMPLIFIERS PRE LI MIN ARY (Pending completion of final manual) 3370 SAN FERNANDO RD., #206 LOS ANGELES, CA 90065 PHONE: (323)-256-3000 FAX: (323j-254-3210 E Mail: electronle@compuserve.com L-RSS-2AB(AC)—SIA9 Table of Contents POWER AMPLIFIER SPECIFICATIONS .................................. 2 RSS-ZAB-AIH .................................................. 2 HSG-ZAC-AIR .................................................. 4 Theory of Operation .................................................. 6 Circuit Description ................................................... 6 Amplifier Final Stage ............................................ 6 Bias Circuit .................................................... 6 Low Pass Filter ................................................. 6 Directional Coupler ............................................. 7 Carrier Operated Relay (COR) ..................................... 7 Cooling Circuit ................................................. 7 Splirler/Combiner ............................................... 7 Appendix ........................................................... 8 POWER AMPLIFIER SPECIFICATIONS RSS-ZAB-AIR Frequency: 118-136 MHz Voltage: 24-28 VDC Input Power: 4-6 waits Output Power: 25 watts Mode: AM r— ——r * TYPICAL MAX. METHODS OF Gown-IONS MEASUREMENT BRAMETER —4 Frequency 118 136 MHz Flange MHz _|_ “1 Spurious & Harmonics Voltage 24 28 VDC VDC Input‘Oulrx-I 50 ohms 1 Impedance Power Gain 12 dB —*l InpuI Power 4 watts 14dB Swatts Range l— Fleceive pom :‘. .9 dB insertion loss conneclcx to RF input Connector ,, HF power 4:58 I +1dB Between 113- output flatness 136 MHZ FIF Output 25 4-6 watt input TIA/ElA-603 2.2.1 Power watts CW 1_ _L_ Modulation 6% 9096 modulation linearity @ 25 watts (distorlion) carrier power fi—“n _._ carrier power ——r _|'_ _l_ _'I_ METHODS OF PARAMETER MIN. TYPICAL MAX. CONDITIONS MEASUREMENT Peak envelope 90 watts 9096 modulation power PEP @ 25 watts Current through DC temperature Transmit u. 25 W CW current drain I amps output supply line Standby current 1 220 mA No Rx or Tx Current through DC drain signal supply line Duty cycle 5096 ; Operating —30“ C +60” C _._ Type “ BNC' Output Type “N” Connector, female "0 Input Connector, female IlO L. POWER AMPLIFIER SPECIFICATIONS (cont'd.) RS3-2AC-AIR Frequency: 118-136 MHZ Voltage: 24-28 VDC Input Power: 4-6 watts Output Power: 50 watts CW Mode: AM METHODSOF PARAMETER MIN. TYPICAL MAX. CONDITIONS MEASUREMENT Frequency —h 18 J— J —_I. 136 Range MHZ MHZ Spurious & 70 dBc Harmonics 4—__ —_ Voltage 24 28 VDC VDC —J— _—r input/Output 50 ohms Impedance Power Gain 12 dB 14 dB Input Power 4 watts 6 watts Range Receive path <1 .0 dB Measured from HF output insertion loss connector to HF input Connector _1_ + RF power ~1dB +1dB Between 118» output flatness L 136 MHZ RF Output 50 46 watt input TIA/EIA603 2.2.1 Power watts , CW _‘i Modulation 694. 9096 modulation linearity l @ 50 watts (distortion) # carrier power Peak envelope 180 watts 90% modulation power PEP @ 50 watts I carrier power PARAMETER METHODS OF MIN. TYPICAL MAX. CONDITIONS MEASUREMENT ,__ Transmit 6.0 50 W CW Current through DC current drain amps oquuI supply line Shndby current 440 mA No Rx or Tx (fitment through DC drain signal supply line A_ , 7 , I. Duzy cycle 50% I Operating 30“ C +60“ C temperature Connector, Type female I/O um): “BNC” _,_ ‘L Connector, Type “N" female l/O LOutput _._ Theory of Operation The VHF Airband RF Power Amplifiers are designed to amplify an Amplitude Modulated RF signal with a frequency range of 1 18 - 136 MHZ, at four to six watts, to yield 25 W CW output for the RSS-ZAB-AIR model and 50 W CW for model RSS-ZAC-AIR . The amplifiers are Circuit Description The amplifiers described here are comprised of a few main blocks (refer to Block Diagrams #102203 and 102204, and Schematic Diagrams #1019778 and 1019778-1. A briefdescription of each follows: RF Amplifier Final Stage This stage provides approximately 13dB gain utilizing an RF power transistor Q]. The attenuator ATT] ensures a proper drive level for this stage, TransistorQl is matched to 50 ohms at both C7, are used to match the base of Q] to 50 ohms. Capacitors C10, C1 1, C12, and C13, as well as coils L5 and L6, are used to match Q1's collector to 50 ohms. DC voltage is supplied through L4, with C15 and C16 functioning as RF bypass capacitors, and C34 used as a feed-through capacitor, Bias is provided by the Bias Circuit described in the next subsection. Bias Circuit The Bias Circuit provides the necessary bias to the base of transistor 01. The bias current is set to provide a Class A8 operation for maximum linearity with minimum distortion of the amplitude-modulated signal. Resistors H1 and R2, in combination with diode Dt, supply an optimum bias. Ce, CB, and Gt 7 are the HF bypass capacitors. A high impedance of the choke L3 protects the bias circuit from an RF signal. 034 is a storage capacitor that insures a constant bias during a signal peaks. Low Pass Filter (L.P.F.) The L.P.F., comprised of L] I, L12, L13, C24, C25, C26, C27, C28, and C19, is an Elliptic 7- pole low pass filter providing 50-60 dB of attenuation to frequencies of the second harmonic and above. Directional Coupler DC1 The Directional Coupler DCI utilizes a strip line design and provides approximately 30 dB of coupling of the forward and reflected power. These signals are rectified by Schottky diodes D2 and D3. DC voltages proportional to the forward and reflected power through feed-through capacitors C32 and C33 are available for external monitoring. Resistors R7 and R8 set a necessary level of Vfwd and Vrefl. R5 and R6 are 50-ohm termination resistors; C30 and C31 are RF bypass capacitors Carrier Operated Relay (COR) The COR is activated by RF output from the transceiver. It switches an RF signal through the power amplifier during transmission and around it during receiving Cooling Circuit This circuit consists of thermostat switch SW] and a DC-powered fan. As the temperature of the heat sink exceeds 45 ° C, the themiostat’s contacts close, providing a DC voltage to the fan. The fan remains activated until the heat sink temperature falls below 45 “C. Splitter/Combiner (RS3-2AC-AIR only) The input splitter (C18, C19, C23, L7, L8, and R3) and the output combiner (C20, C21, C22, L9, L I 0, and R4) are lumped equivalent of the Wilkinson 2—way splitter/combiner. Resistors R3 and R4 are balance resistors. Capacitors C19 and C20 are used for the fine tuning of the bandwidth. APPENDIX FRONT PANEL METER READINGS ”£4 31? mqul1 An 14 mu L LI , mm} A ; p _
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