HAMTRONICS R301 Installation Operation & Maintenance Download | Manualshive

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©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 12/11/02

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Summary of Contents for R301

Page 1: ...ions The receiver board relies on the mounting hardware to provide the dc and speaker ground connections to the ground plane on the board so metal standoffs and screws should be used for mounting Note...

Page 2: ...ct the mute output of the TD 5 to E1 on the receiver ADJUSTMENTS Frequency Netting All crystals age a little over a long period of time so it is customary to tweak any receiver back onto the pre cise...

Page 3: ...that you need to turn on switch sec tions to add 30 kHz to the setting for 146 790 It is not necessary to recal culate the whole range of settings Another trick if you want to switch between two or th...

Page 4: ...ected audio THEORY OF OPERATION The R301 is a frequency synthe sized vhf fm Receiver Refer to the schematic diagram for the following discussion Low noise dual gate mos fet s are used for the RF ampli...

Page 5: ...kHz region which should be pre sent at the top lead of R27 U1 pin 11 with no input signal Between pins 10 and 11 of U1 is an op amp active filter tuned to 10 kHz RF Signal Tracing If the receiver is...

Page 6: ...oise in this unit should be al most as good as a crystal oscillator radio If you notice excessive white noise even though the signal is strong it may be caused by a noisy vco tran sistor Q1 Try swappi...

Page 7: ...7 5 U4 11 1 4 U4 3 7 6 U4 12 0 55 with U4 4 8 sq just closed U4 5 7 6 U4 13 U4 6 7 6 0V sq open U4 7 7 6 7 6V sq closed U4 8 8 U4 14 0 U4 9 3 3 Varies U4 15 0 w freq U4 16 1 8 U5 1 0 U5 5 0 U5 2 0 U5...

Page 8: ...ytic C55 not used C56 220pf 221 C57 68pf C58 C61 0 1 f monolithic 104 C62 C63 not used C64 10 f electrolytic C65 100 f electrolytic D1 BB132 varactor diode surface mt under board D2 D4 1N4148 switchin...

Page 9: ...1998 Hamtronics Inc Hilton NY USA All rights reserved Hamtronics is a registered trademark Revised 12 11 02 Page 3...

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