@ AGC switch, @ Notch switch, @ F.LOCK switch

The table in section 6-1, CRYSTAL FILTER INST AL-

LA TION on page 27 shows the bandwidth of each

switch setting. Note the differences when the option- al filters are installed. The YK-88C is used in the "N" position and the YK-88SN in the "M 1" position.

Notes:

1.During transmit the wide filter position is selected regardless of the position of the SELECTIVITY switch.

2.When in the FM mode the bandwidth is always 15 kHz, regardless of the position of the SELECTIVI- TY switch.

3.When the SELECTIVITY switch is set to N or M 1, and no optional filters have been installed, there will be no sound from the speaker. Refer to the option-

al filter installation procedure in the rear of this

manual for information on installation of these options.

@ AGC switch

This switch selects the operating time constant of the AGC (Automatic Gain Control) circuit during receive. When the AGC switch is set to SLOW, the receiver gain and S-meter readings will react slowly to large in- put changes, and when set to FAST, the receiver gain and S-meter will react quickly to changes in the input signal level.

The normal position when using all modes is the SLOW position. When working weak signals, or high speed CW you might wish to use the FAST position.

Note:

This switch is disabled during FM operations.~~"':

@ NOTCH switch

When this switch is ON, the notch filter is activated.

@PROC (Processor) switch

Effective transmit power output will increase when the PROC switch is turned ON during USB, LSB, AFSK, or FM mode operations.Note:

When the speech processor function is used in the USB, LSB, or AFSK mode it is possible to overdrive the transmitter: An easy way to check for excessive modu- lation is to monitor the ALC meter. If the needle is over

the ALC zone you are overmodulating. Reduce the MIC gain control setting until the needle remains in the ALC zone on voice peaks.

@ F.LOCK switch

The selected dial frequency is locked and cannot be changed except thru the use of the RIT/XIT controls, when this switch is ON.

~ UP/DOWNswitches

Pressing the UP switch increases the frequency, and pressing the DOWN switch decreases it.

@ 1 MHz step switch

This switch is used to determine if the UP/DOWN switches will function in 1 MHz steps or only thru the amateur bands. When the 1 MHz step position is selected, the 1 MHz indicator will light.

@ TUNING dial (VFO)

Rotate the knob to select the desired frequency. Fast tuning is possible by rotating the knob rapidly. This con- trol may also be used to select the desired memory channel. The dial drag is adjustable by holding the out- side knob and turning the inside knob clockwise to in-

crease drag, and counterclockwise to decrease drag.

@ Program keys

M"'V:	Used	to	recall	a frequency		from		memory
	to the VFO.
SCAN:	Pressing		during	VFO operation			will initiate
	program scan, and pressing during memory
	operation will initiate memory scan. Press-
	ing during scan operation will cause the
	scan speed to toggle between 2 speeds,
	fast	and	slow.
CLEAR:	Used	to	cancel	memory	storage		operations,
	or to cancel an entry during direct keyboard
	entry	of frequency using				the	ENT key.
VFO/M:	Used	to	switch	between		memory		or VFO
	operations.
M.IN:	Used	to	enter data into a memory					channel.
ENT:	Used	to	directly	enter	a frequency			from the
	numeric		keypad.

@ PHONES jack

Output terminal for headphones.

@ MIC jack

Connector for a microphone.

MIC connector (Front view)

@ AT TUNE switch

When this switch is turned ON with the AUTO/THRU switch is placed in the AUTO position, the automatic tuner will be engaged and the tuner will try to match

the antenna.

@ AUTO/THRU switch

AUTO: The auto antenna tuner is used in transmit.

THRU: The auto antenna tuner is not used in transmit.

I:!