1 MODE : Selection of LSB, USB, CW-W (SSB flter, and CW-N (optional CW filter) is provided.

2 WIDTH ON: When this button is pressed, the variable bandwidth function is activated.

3 WIDTH: This control varies the IF bandwidth from 2.4 kHz down to 300 Hz. When the WIDTH switch
is OFF, the bandwidth is fixed by the filter selected at the MODE switch.

4 SELECT switches: These are used only with the optional scanning external VFO that we do not have.
(not functional on our unit)

5 PRESELECT: The preselector control peaks the RF and IF stages for the frequency in use.

6 BAND: The bandswitch selects the frequency band in use: 160-10 meters, plus WWV / JJY 5MHz.

7 CLARIFIER: The clarifier control allows offset of +/- 2.5 kHz from the frequency established by the main tuning
dial. This is called the RIT (receive incremental tuning) in more modern rigs.

8 & 9 CLARIFIER SELECT switches:
Prese the RX button for offset of the receive frequency.
Press the TX button for offset of the transmit frequency.
Press both buttons for offset of the transceive frequency.

10 AF GAIN: The AF GAIN control varies the output level of the audio amplifier stages. Clockwise
rotation increases the gain of these stages. (in other words, this is the VOLUME control)

11 RF GAIN: The RF GAIN control varies the gain of the RF and IF stages. Clockwise rotation
increases the audio output level.

12 LOADING: This control tunes the output circuit of the final amplifier pi network to match the feedpoint
impedance of the load.

13 PLATE: This control tunes the plate circuit of the final amplifier.

14 MAIN TUNING KNOB: Rotation of this knob selects the operating frequency, in conjunction
with the setting of the band switch. One revolution of the dial produces a frequency change of
approximately 17 kHz.

15 DIGITAL DISPLAY: Our unit does not have this. We have the analog display that reads directly in
kHz. These are added on to the mHz reading selected by the BAND switch. For example: if the BAND
switch says "40", this stands for 40 meters which begins at 7.00 mHz. If the analog dial is on 2.0, the total
reading is 7.20 mHz. The second analog dial (see item 16) allows finer resolution down to less than 1 kHz.

16 ANALOG DIAL: The analog dial allows readout of the operating frequency to better than
1 kHz.

17 DIM : This control allows dimming of the meter and dial lamps.

18 METER : The meter displays final amplifier cathode current (IC), relative power (PO), and
ALC feedback voltage.

19 NB : This control varies the threshold point for the noise blanker, and should be set to the minimum
point that provides the desired blanking action.

20 DELAY : This control sets the delay time for the VOX relay. For voice-actuated SSB, or semi-break-in
CW, the operator may select the delay time most suitable for his or her operating habits.

21 VOX GAIN : The threshold level for the VOX system can be varied using this control. In the PTT
position, PTT (push to talk) control is provided, for relay control via the microphone PTT switch.

22 DRIVE : This control sets the carrier level for CW and tuning purposes. When the RF processor is
ON, this control varies the RF output on SSB, as well. In other words, you set the power output level
here.

23 MIC GAIN : This control sets the output level of the microphone amplifier stage. Clockwise
rotation increses the mic gain level.

24 COMP LEVEL : This control varies the compression level for the built-in RF speech processor.

25 FUNCTION switches
PROC.................... This switch activates the RF speech processor.
ATT ...................... This switch allows the insertion of 10 or 20 dB attenuators in the incoming signal path.
AGC S/F/OFF ...... This switch allows selection of the desired AGC dcay time. In the OFF position, the AGC
is switched off, and the S-meter will not function.
PO/IC/ALC.......... In the PO position, relative power output is displayed on the meter. In the IC position, final amplifier cathode current is displayed. In the ALC position, ALC voltages is displayed. Regardless of the setting of the meter switch, the meter functions as an S-meter on receive.
NB/MARK ..........In the NB position, the noise blanker is activated. In the MARK position, the internal crystal calibrator is activated.

26 POWER : This is the main ON/OFF switch for the transceiver.

27 HEATER : With the HEATER switch on, heater voltage is applied to the driver and final amplifier tubes. This switch may be turned off during periods of RX, when energy conservation is critical.

28 Phones : This is a standard 1/4" phone jack for use with headphones.

29 MIC : This is a 4 conductor jack for microphone and PTT input.