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INSTRUCTION

MANUAL

FR-50B

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Summary of Contents for FR-50B

Page 1: ...Page 1 of 22 INSTRUCTION MANUAL FR 50B ...

Page 2: ...ed sized and weights to metric Any errors I found have been corrected I have resisted making wholesale changes to the language used in the original instruction where I have added comments these are in italics References to AVC have been changed to AGC Version 17 December 2018 ...

Page 3: ...ng on the same frequency is possible This is a useful feature for SSB communication A built in monitor circuit enables monitoring of the station transmitted signal at any time SPECIFICATIONS Frequency range 80m 3 5 3 8 MHz 40m 7 0 7 5 MHz 20m 14 0 14 5 MHz 15m 21 0 21 5 MHz 10m 28 0 29 2 MHz JJY WWV 10 0 10 5 MHz can be installed The AUX position on my receiver covered 1 2 1 7 MHz and appeared to ...

Page 4: ...ange A FM type variable condenser is used with electronic band spread for pre selector tuning The centre of each amateur band is approximately at the centre of the range of the pre selector control On the 3 5 MHz band the pre selector covers 3 5 3 8 MHz 2 1st Mixer The amplified signal and local oscillator output are mixed by introducing to the grid and cathode of triode mixer V2 12AT7 The triode ...

Page 5: ... tube 6 2nd Local Oscillator Tr3 silicon transistor type 2SC372 together with a quartz crystal X1 and other parts are installed in an I F T case Output of the 2nd local oscillator is applied to the control grid of V3 6CB6 through transformer Ll9 Oscillator frequency is 5 628 9 kHz 7 2nd I F Amplifier This is a two stage amplifier using two 6BA6 coupled by two 4 kHz mechanical filters S meter is in...

Page 6: ...ol VRl and monitor control VR2 are in series to cathode return circuit of Vl and V4 For muting with a transmitter relay contacts must open on transmit and close on receive Thus on receive the mute terminal is grounded On transmit the monitor potentiometer increases the bias The relay mentioned here is part of the FL 50B transmitter 12 A F Amplifier Output from the detector through the mode switch ...

Page 7: ... ANL Off CALIB Off Monitor Minimum position AGC Fast CH select VFO Main dial may be accurately set for each band at the 100 kHz points with the aid of a crystal calibrator and adjusting the zero set control to zero beat Turn the main tuning knob to receive the desired signal and adjust for maximum S meter reading then peak with pre selector When impulse noise such as generated by auto ignition sys...

Page 8: ...s possible to connect to the VFO When using a transmitter other than the FL 5OB the mute terminal must be so connected as to be open circuited to ground during transmitting and short circuited during receiving If receiver is used while disconnected from the transmitter M G terminals must be shorted together 5 Transceive Operation Set the Xtal switch of the FL 50B in EXT OSC position Switch to SPOT...

Page 9: ... voltages than those shown in the table 2bis Resistance Measurements To further assist with fault finding Table 2 contains expected resistance measurements between ground and the indicated point in the circuit These measurements are made with the receiver switched off and preferably with the plug pulled out of the mains socket 3 455 kHz I F Alignment Apply a 455 kHz signal to grid 1 of V3 pin 1 Ad...

Page 10: ...SG output 3 5 MHz and preselector VC1 at 1 adjust TCl and TC6 for maximum S meter reading On this band the upper limit of the preselector range is about 3 8 MHz so a slight sensitivity decrease results between 3 8 and 4 MHz During the alignment keep the SSG output level down to the minimum of that required at least below 60 dBm TC4 and TC9 are used to adjust the AUX frequency I have no idea what T...

Page 11: ...0 6 35 Table 1 Voltage measurements ѻ Calibrator switched on Mode switch in SSB CW position no idea and no indication on any of my reference documents RESISTANCE MEASUREMENTS ohms TUBE PIN NUMBER 1 2 3 4 5 6 7 8 9 V1 150 6K 18K 0 V2 100K ѻ 1M 0 100K 100K 270 0 V3 100K 330 52K 500K 0 V4 0 5K8 30K 180 V5 0 5K6 11K5 150 V6 22K 220 34K 20K 4K7 V7 47K 0 70K 70K 220 V8 500K 220 470K 3K6 9K5 2K2 300K Tab...

Page 12: ...circuit in the H T or heater circuits or failure of one or more of the silicon diode rectifiers D5 D6 D7 D8 2 No sound from speaker Examine speaker connections making sure that the headphone plug is removed from the jack on the front panel Check audio amplifier section by touching grid of V8 with a screwdriver Check detector stages AM detector diode D4 SSB BFO and product detector 3 Audio and dete...

Page 13: ...ns The knob skirt may be adjusted independently of the knob itself by firmly holding the knob while turning the skirt and can be set at 0 for 100 kHz points with a crystal calibrator Since on all bands except 10m the knob rotates two full turns for each 100 kHz segment a double numbering system is adopted on the skirt thus read 0 to 49 kHz using the black numbers and 50 to 100 kHz using the red nu...

Page 14: ...Page 14 of 22 PART LOCATIONS ...

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Page 16: ...Page 16 of 22 CIRCUIT DIAGRAMS ...

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Page 21: ...Page 21 of 22 This page is set to print landscape A3 ...

Page 22: ...Page 22 of 22 This page is set to print landscape on a piece of paper 54cm wide by 25cm high ...

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