Icom IC-751 [29/37] 10 general coverage receiver
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Icom IC-751 [29/37] 10 general coverage receiver

Icom IC-751 [29/37] 10 general coverage receiver

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5 10 GENERAL COVERAGE RECEIVER When you wish to operate on a band other than the initia lized band push the BAND SELECT FUNCTION switch then turn the TUNING CONTROL to select the band you wish to operate Slowly turn the AF GAIN control clock wise to a comfortable level After releasing the BAND SELECT FUNCTION switch rotate the TUNING CON TROL until a signal is received In this mode the set does not transmit on any frequency even if the frequency is on the HAM band Set knobs and switches as follows POWER SWITCH T R SWITCH VOX GAIN CONTROL OFF OUT RECEIVE DOWN Completely Counterclockwise OFF position NB LEVEL CONTROL Completely Counterclockwise OFF position AGC SWITCH SLOW AF GAIN CONTROL Completely Counterclockwise RF GAIN CONTROL Completely Clockwise SQUELCH CONTROL Completely Counterclockwise TONE CONTROL Center 12 o clock Position TUNING RATE SWITCH OFF OUT DFS SWITCH OFF OUT BAND SELECT FUNCTION SWITCH OFF OUT DIAL LOCK SWITCH OFF OUT FILTER SWITCH OFF OUT PBT CONTROL Center 12 o clock Position NOTCH FILTER SWITCH OFF OUT NOTCH FILTER CONTROL Center 12 o clock Position DUPLEX SPLIT SWITCH OFF OUT PREAMP ATT SWITCH OFF The multi function meter needle will move according to the signal strength so tune for the highest possible meter reading and the clearest audio Refer to 5 5 2 7 on pages 22 and 23 for other functions 5 6 1 on page 23 for CW reception 5 7 1 on page 24 for RTTY reception 5 8 1 on page 25 for AM reception and 5 9 1 on page 25 for FM reception 5 11 OTHER OPERATIONS 5 11 1 VSWR READING The IC 751 has a built in VSWR meter for checking an tenna matching in order to avoid problems caused by VSWR Set the METER switch to the Po position Set the operating mode to RTTY and place the TRANSMIT RECEIVE switch to TRANSMIT Adjust the RF POWER control located on the front panel so that the meter needle points to SET on the meter scale Set the METER switch to the SWR position With the switch in the SWR position SWR reading can be seen on the meter Although this unit is built to handle VSWR of up to 2 1 it is recommended that the antenna s be adjusted for the lowest possible VSWR After taking the reading return the METER switch to the Po position ALSO BE SURE THAT THE ANTENNA IMPEDANCE IS 50 OHMS OR THERE MAY NOT BE ANY OUTPUT OTHERWISE THERE WILL BE DAMAGE TO THE TRANSCEIVER The other controls are unrelated and need not be set for this operation Now push the POWER switch in The meter lamp will be illuminated and after a few seconds a frequency mode and HAM GENERAL mode memorized in the VFO A and memory channel number 01 will be shown on the frequency display If the operation mode is in the HAM band mode The letters GENE are not displayed push the HAM GENE RAL COVER SELECT switch and the letters GENE will be displayed on the frequency display and the set will work in the GENERAL COVERAGE mode The final transistors used in the IC 751 are of and are protected to a reasonable extent incorporated in the set These devices can be have an indefinite lifetime since there are no burn out In SSB operation there are both a USB upper side band and an LSB lower side band USB is selected on the 10MHz band and above and LSB on the 9MHz band and below by pushing the MODE SELECT switch SSB When you wish to operate on the opposite sideband push the FUNCTION KEY first then the SSB switch good design by circuits expected to cathodes to When in doubt about antenna systems use the lowest power setting possible to achieve meaningful readings Use a good tuner or transmatch when necessary Always use caution and exercise judgement when testing RF power generators However the selected mode does not change on the entire band For example LSB has been selected on 8MHz band then the operating band is changed to 10MHz band or above the operating mode LSB will be kept 5 11 2 WWV RECEPTION To receive WWV or other standard frequency station set the operating band to 10MHz in the HAM band mode or GENERAL COVERAGE mode and the MODE to any mode Tune to 10 000 0MHz on the frequency display 26

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