HAMTRONICS R302 Series Installation Operation & Maintenance Download Page 9 | Manualshive

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©2005 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 5/17/05

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Summary of Contents for R302 Series

Page 1: ...an be attached to a connector or feedthrough capaci tors used on the cabinet in which it is installed Be very careful not to route the wiring near the components on the left hand side of the board which contains sensitive loop filter and vco circuits which could pick up noise from the wiring Power Connections The receiver operates on 13 6 Vdc at about 200 mA peak with full audio Current drain with...

Page 2: ...criminator is properly adjusted Do this by connecting a dc voltmeter to E4 Connect a signal generator set for 10 700 MHz to TP3 and set the level for a relatively strong signal so there is very little white noise Adjust dis criminator coil T2 for 3 3Vdc Then reconnect the signal generator to an tenna connector J1 and set it for the precise channel frequency You can also use a strong signal on the ...

Page 3: ...ands a Set the SQUELCH pot fully counterclockwise and the VOLUME pot just a little clockwise b Connect speaker and 13 6 Vdc You should hear white noise c Set dip switches for desired frequency d Connect voltmeter to TP1 Ad just vco coil L1 for 2 0Vdc Al though the vco will operate over a wide range of tuning voltages from about 0 5V to 4 5V operation is opti mum if the vco is adjusted to 2 0V e Co...

Page 4: ...nthe sizer are applied to synthesizer U2 by microcontroller U1 Everything the synthesizer needs to know about the band division schemes reference fre quency and oscillator options is gen erated by the controller Information about the base frequency of the band the receiver is to operate on and the channel within that band is calculated in the controller based on information programmed in the eprom...

Page 5: ...ole board will be installed in a shielded enclosure so we elected to keep the size small by not using a separate shield on the vco However this means that you must use care to keep wiring away from the vco circuit at the right side of the board Having the board in a metal enclosure will shield these sensitive circuits from flo rescent lights and other strong sources of noise Because the frequency ...

Page 6: ...no to 1 Vdc full quieting E4 Freq Varies with frequency of input signal Voltage at this point normally is ad justed for 3 3Vdc with a signal exactly on fre quency Can vary a little without being a problem Table 5 Typical Xstr DC Voltages Xstr Stage E S B G1 C D G2 Q1 vco 1 3 2 0 6 5 Q2 buffer 0 0 7 4 5 Q3 dc filter 6 8 7 4 7 6 Q4 RF ampl 0 0 7 5 3 8 Q5 Mixer 0 0 7 6 0 Q6 sq open 0 0 8 sq closed 0 ...

Page 7: ...atched set of 4 FL5 455kHz ceramic filter J1 RCA Jack L2 0 33µH RF choke red sil orn orn L3 L8 2 t slug tuned red L9 0 33µH RF choke red sil orn orn Q1 Q2 MSC3130 Q3 MMBT3904 Q4 Q5 BF998 MOS FET Q6 MMBT3904 R1 180Ω R2 2 2K R3 2 Meg R4 27Ω R5 10K R6 47K R7 R8 2 2K R9 10K R10 6 8K R11 3 9K R12 180Ω R13 47Ω R14 15K R15 470Ω R16 3 9meg R17 R18 100K R19 47K R20 330K R21 15K R22 47K R23 100K panel mount...

Page 8: ... 2005 Hamtronics Inc Hilton NY USA All rights reserved Hamtronics is a registered trademark Revised 5 17 05 Page 8 ...

Page 9: ... 2005 Hamtronics Inc Hilton NY USA All rights reserved Hamtronics is a registered trademark Revised 5 17 05 Page 9 ...

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