Rf Gain Control; Programmable Memory Channels; Mem Adrs Display - Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement

INSTALLATION AND OPERATION WJ-8718A/MFP
sideband voice signals, there are rapid fluctuations in transmitted power with recurring peaks.
When this type of signal is received, it is desirable that AGC attacks quickly and decays slowly;
therefore, slow AGC is desirable for USB, LSB, and ISB signals.
When it is desirable to fix the gain, to make comparisons of signal strength, or to
eliminate signals or noise below a particular amplitude, the manual gain mode should be used.
In this mode, the RF GAIN control can be engaged and should be adjusted so that the signal
strength meter registers at the MAN SET line, as discussed in paragraph 2.4.4.6.4.
2.4.4.6.4
RF
Gain
Control
When the receiver is in the MGC (Manual Gain Control) mode, rotating the RF
GAIN control clockwise approximates a linear increase in receiver gain. To obtain the greatest
latitude for signal level change, engage the SIGNAL STR meter switch and set the gain control
for an indication at the MAN SET mark on the meter.
2.4.4.7
2.4.4.7.1
Programmable Memory Channels
MEM ADRS Display
The MFP accesses 99 channels of addressable memory in locations 1 through 99.
Memory location is entered on the keypad and is terminated with RECALL or STORE. As soon
as the terminator is entered, the address is displayed on the 2-digit, 7-segment LED MEM
ADRS display. When terminator STORE is selected, the memory location is loaded with the
receiver parameters registered on the front panel. When terminator RECALL is selected, the
parameters in the recalled memory channel are transferred to the receiver.
Use of the EXAM key allows the contents of the numbered memory channels to be
examined without affecting receiver operation. The EXAM key can be used to examine a
selected memory channel or can be used to step sequentially through the numbered memory
channels.
To examine the contents of a single memory channel, enter the memory address on
the general purpose keypad before pressing the EXAM key. The contents of the addressed
channel will be reflected by the front panel LEDs, but the receiver parameters will remain
unchanged. The MEM ADRS display will blink on/off for the memory chanel being examined.
To step sequentially through the numbered memory channels, press the EXAM key
with no preceding memory address. The front panel LEDs will reflect the contents of a memory
channel, and the address of that channel will appear in the MEM ADRS display. The channel
that is initially accessed is determined by the conditions of the preceding memory access.
Successive use of the EXAM key will access the memory channels in numerical sequence up to
99, then back to 1 again until the EXAM mode is released.
Activation of the CLEAR key releases the EXAM mode and restores the front
panel LEDs to the receiver operating parameters in effect before (and during) the EXAM
procedure.
2-10