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Hamtronics R144 Vhf Receiver Installation And Maintenance Manual

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    Page 1 ©1999 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Manual revised: 1/1/00 Page 1 FUNCTIONAL DESCRIPTION. The R144 is a premium commercial grade single-channel vhf fm receiver. It features a helical resonator front end with low-noise dual gate fets, an 8-pole crystal filter plus a ceramic fil- ter for superior i-f selectivity, and hysteresis squelch circuit to lock onto fading signals. The R144 kit is avail- able for the 143-150 MHz band, and wired...
    Page 2 ©1999 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Manual revised: 1/1/00 Page 2 necting the receiver from the antenna must be provided, and we recommend our TRR Coax Relay Module if the power level is under 25 Watts. Other- wise, a larger coax relay will be re- quired. Discriminator Meter. If you wish to use a discriminator meter and you are handy in designing with op-amps, you can run a sample of the dc voltage at DISCRIMINATOR output terminal E5 to...
    Page 3 ©1999 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Manual revised: 1/1/00 Page 3 list of typical audio levels are given to act as a guide to troubleshooting. Although voltages may vary widely from set to set and under various op- erating and measurement conditions, the indications may be helpful when used in a logical troubleshooting pro- cedure. The most common troubles in all kits are interchanged components, cold solder joints, and solder splashes....
    Page 4 ©1999 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Manual revised: 1/1/00 Page 4 PARTS LIST FOR R144 Note: Capacitor values and helical resonator vary with frequency seg- ments. Above 150 MHz, values may vary. Ref # Value (marking) C1 18 pf C2 62 pf C3 .001 uf chip capacitor C4 not assigned C5 .001 uf (1nK or 1nM) C6 4 pf C7-C8 .001 uf chip capacitor C9 .01 uf disc (103) C10 .001 uf (1nK or 1nM) C11 2 pf C12 2 pf C13 2 pf C14...
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