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/IIIIVEUTEC
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Service
Manual
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Cİ
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SP-(j05H/SP-ft02H
" 'fPortatı'e R~~~p
Conımurıications
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August 1~84
11-"-'
MK=
'_'CJ'-,
VtiF
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Summary of Contents for Neutec SP-605H
- Page 1 -'"'7_~"~---'---.--~_.'-----~~-~-~"-------- -..-- ---~~ , ..------- ---.-- '1::. Service Manual August 1~84 ,-, ,- ,-" 11-"-' '_'CJ'-, Cİ _i _'. SP-(j05H/SP-ft02H VtiF . ..Syntheşiz~d " 'fPortatı'e R~~~p -::2CL~_' /IIIIVEUTEC '/<.'0/ @£joe, .. - ".,-?cr;n Conımurıications...
- Page 2 TABLE OF CONTENTS Chapter 1 Specifications ..__ _....Chapter 2 Operation Chapter 3 Theory of Operation....Chapter 4 Frequency Programming.
- Page 3 CHAPTER 1 " ., -~ Specifica tions GENERAL Frequency Ranges SP-605H 138-150 MHz SP-605H 150-160 MHz SP-605H 160-170 MHz SP-605H 170-175 MHz Number of Channels Programming Synthesized Supply Voltage Current Drain (TX) 1100 mA (RX) 90 mA (Standby) 25 mA...
- Page 4 Power output for the SP-605H is fiye watts in the HI position one watt in the LO position. The SP-602H proYides watts of RF output in the HI position and 0.5 watts...
- Page 5 parform operational check of the receiver speaker system. 2.24 PTT SWITCH To transmit from the portable the press-to-talk (PTT> switch on the side of the unit must be pressed. This action engages transmitter disables receiver. When transmitting, user should speak across the face of unit within a few inches of the speaker.
- Page 6 Theory of Operation RECEIVER Antenna Switching Received signal enters the antenna connector and passes through the low-pass filler network into the RF amplifier stage TR221. When theunit is in the transmit mode, the transmitted signal is prevented from entering the RF amplifier stage by the antenna switch diodes 0103 and 0104. In the receive mode, these diodes are non-conductive and decouple the TX final stage.
- Page 7 SYNTHESIZER The primary function of the synthesizer is to provide transmitter injection signal, and local asciIIatar signal to the receiver. This design allows a single crystal oscillator to provide stable frequency generation without the need for tuning crystals for each channel. By dividing the reference oscillator signal by an amount respective of the selected channel, the synthesizer can provide a range of frequencies.
- Page 8 CHAPTER 4 Frequency Programming GENERAL INFORMATION Frequency programming for the SP-605H is accomplished by the proper installation of diodes on the diode-matrix board, located in the back of the uniL. Each unit is shipped with a sufficient supply of diodes to program all six channels.
- Page 9 TRANSMIITER PROGRAMMING Diode positioning for transmitter channels can be calculated using the following formula: (TX X .5 - ftx X 2) X 400 where: diode programming position transmit frequency (MHz) ranging crystal frequency (per chart 4.2 above) Exarnple: Desired transmit frequency 155.00 MHz (TX X .5 - ftx X 2) X 400 (155.00 X .5 - 35.10 X 2) X 400...
- Page 10 RECEIVER PROGRAMMING Programming of the receiver diodes is similar to the transmitter. The only diHerence in the procedure is the applied formula. For receiver programming the following formula is used: [(RX - 21.4) .5 - (frx X 2) where: diode programming position receive frequency (MHz) ranging crystal frequency (per chart 4.2 above) Example: Desired receive frequency...
- Page 11 B - 2CH Rı( c -:nı E - 5Qi F - OC:H RX G -101 i -:l:H nı J - 4CH K -!:CH L - OC:H T>ı ••• :::J *.*ff***** « •••••••••••• aı...
- Page 12 "'~ :ı.:}~ A/ignment Procedures PRELlMINARY Alignment of the SP-605H should be performed by qualified technicians only. Warranty may be void if technical repair is attempted by anyone that is not trained and famiHar with portable communications equipmenL. Alignment of the SP-605H can easily be accomplished with standard test equipment.
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Page 13: Parts List
Power Supply Check - To assure proper operation, the SP-605HITM should not exceed the following current drain specifications: Model Supply Voıtage Mode Maximum Current SP-605h TX "Hill 12.0 VDC 1.2 A SP-605H 12.0 VDC TX"lO" 450 mA SP-605H 12.0 VDC... - Page 14 CHAPTER ,:.." Options SINGlE TONE CTCSS ENCODER/DECODER (PT-10l) Tone Data Chart Tone Freq. Data Tone # (Hz) 67.0 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7...
- Page 15 PT-10L Schematic .•. .•. .•. • •.. • • • • • • • • • • • • • •.. »- •• •• :ıl J 70 1702 iO il :> •... LI> •• •... •... Tl 7 O i ••...
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