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WJ-8718A/MFP
INSTALLATION AND OPERATION
Entering 1, 8, and
*
in order on the keypad invokes the Receiver BITE Tests. These
seven tests examine, in order, RAM, +15 V, -15 V, IstLO,2nd LO, Bandwidth Selection and
BFO Tuning, producing an error code in the process. The test in progress is displayed by number
in the BFO OFS/THRS LVL display window.
The error code is a binary-weighted code. Any
errors detected are summed and displayed in the FREQUENCY/MHz display window at the end
of the seventh test. The CLEAR key is used to exit BITE tests.
The
*
key is used to erase the contents of the numbered memory channels. Each
memory channel (1 through 99) is cleared when the 9, 9, 9, and
*
keys are pr,essed in the given
sequence.
2.4.4.3
REMOTE and LOCAL Switches
The LOCAL switch places the receiver in local mode, allowing front panel control
of receiver parameters. The REMOTE switch allows 'remote control operation through a data
stream to the rear panel. Remote control is effective only if the receiver is equipped with an
optional remote interface (232M or 488M).
2.4.4.4
RF Frequency
The WJ-8718A HF Receiver is designed to receive and demodulate RF frequencies
in the 5 kHz to 29.99999 MHz range.
The tuned frequency of the receiver can be locally
established via the general purpose keypad or the tuning wheel.
2.4·4.4·1
RF Frequency: Keypad Entry
To enter a tuned frequency via the keypad, the number is entered in order, from
MSD to LSD, and terminated with kHz or MHz.
An unterminated, undesired numerical entry
can be cleared from the receiver's internal circuits by engaging the CLEAR switch. As soon as
the terminator is entered, the operation is complete and the CLEAR switch has no effect. If
the ENTRY FAULT LED glows after entry of an RF frequency, an invalid frequency has been
entered. To disengage the FAULT light, re-enter the desired frequency and terminate with kHz
or MHz.
Use of the kHz or MHz terminator is a matter of choice. For ,example, 123 kHz
could be entered 1, 2, 3, kHz or decimal (.), 1, 2, 3, MHz. In either case, the display will read
00.12300.
Entry of the decimal point (.) is unnecessary if a whole number is entered. For
example, to enter 4 MHz, press the digit 4 key and the MHz key. The internal
cir~uitry
will
take care of the decimal and the display will read 04.00000.
2.4.4.4.2
RF Frequency: Tuning Wheel Entry
The one-finger tuning wheel on the Microprocessor Front Panel '<can be used to dial
the tuned RF frequency to a selected resolution.
The tuning resolution switches are in the
TUNE switch block to the right of the tuning wheel:
FAST represents 1 kHz steps, MED
represents 100 Hz steps, and SLOW represents 10 Hz steps. Selection of a tuning resolution
disengages the LOCK switch and the tuning wheel can be used to dial the frequency.
2-7
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