Specifications

Page 13
Copyright 2006 Robert A. Larson, KC9ICH
TRANSMITTING SINGLE SIDEBAND
The transmitter frequency will be the same as the received signal frequency as indicated by the position of the main tuning dial, or to
any frequency to which the dial is set. If the frequency for transmission is to be the same frequency as the received signal, or on a
clear frequency, the transmitter should be tuned per the Transmitter Tuning Procedure on page 11. If it has been tuned up previously,
only minor adjustments will be required on a new frequency.
Be certain that the Carrier Insertion Control is in its full counter clockwise position.
After tune-up, key the microphone and turn the MIC GAIN control clockwise as you speak into the microphone until the S-Meter
pointer is swinging into the upper third of the scale on voice peaks. No further adjustments will be required from one transmission to
another unless frequency is changed. The meter is heavily damped and its peak reading with average voice modulation may not be
impressive. However, the voice peaks are well over the 200 watt input rating of your Siltronix 1011D.
NOTE
The unit will not transmit when the Band Switch is in the 27.0 REC position. Transmission on 28.5 XCV is illegal unless the operator
holds a valid and appropriate Amateur Radio License issued by the Federal Communications Commission.
RECEIVING AM
In the following instructions, it is assumed that all preceding Preliminary Checks, PA. Bias Adjustment and Transmitter Tuning
procedures have been accomplished as instructed.
Place the Mode Selector switch in the AM REC position. Turn the A.F. Gain Control clockwise to the 3 o’clock position. (If unit was
not previously turned on. wait 30 seconds or more for the tube filaments to warm up).
Rotate the tuning dial until an AM signal is heard. Place the SPOT switch in the ON (up) position. This will produce a whistle’ in the
output which should then be adjusted to “zero beat” by fine adjustment of the tuning dial. Turn the SPOT switch OFF (down). The
AM station is then precisely tuned in and when transmitting in reply, the 1011D will be on the exact same frequency. Adjust the audio
gain for a comfortable listening level. The P.A. Tune and Preselector controls may be adjusted for maximum S-Meter reading.
NOTE
The PRESELECTOR resonates the transmitter driver stages and the receiver RF amplifier plate circuit. The P.A. TUNE and P.A.
LOAD controls adjust the input and output capacitors in the transmitter power amplifier final plate circuit, as well as the receiver RF
amplifier grid circuit. Proper adjustment of these controls in the receive position will result in approximately resonant conditions in
the transmitter stages.
TRANSMITTING AM
The transmitter frequency will be the same as the received signal, as indicated by the main tuning dial, or to any frequency to which
the dial is set. If the frequency for transmission is to be the same frequency as the received signal, or a clear frequency, the transmitter
should be tuned per the Transmitter Tuning Procedure on page 11. If it has been tuned previously, only minor adjustments will be
required on a new frequency.
After Tune-up, push the S-Meter switch down to the P.A. Cathode position and key the microphone. (Work out a means for doing this
with one hand as you will need the other free for the next step). Next turn the Carrier Insertion Control clockwise to set the PA.
Cathode current at 120 milliamperes then release the switch and microphone switch.
Key the transmitter with the microphone switch and speak into the mike. Advance the microphone Gain Control from its minimum
position until the S-Meter pointer just begins to respond on voice peaks.
CAUTION
The Microphone Gain setting is critical. Do not exceed the setting obtained when following the directions in the preceding paragraph.
Excessive over modulation, with its attendant distortion, will result. Your signal will be difficult to understand and will contain
excessive harmonics that may cause interference on this and other frequency bands.
Proper Microphone Gain settings will be obtained with the control at the 8 or 9 o’clock position. “Power Mikes” are not
recommended for use with the 1011D. Use a Siltronix CM1011, Shure 144 or other microphone, with similar characteristics.
If the previous adjustments have all been completed correctly, R.F. output will be 10 to 30 watts dead carrier with mike keyed. Do not
exceed the carrier insertion limits of 120 mA. or damage to the P.A. tube will result. If reduced carrier power is desired, the carrier
insertion can be reduced to produce a meter reading of 100 mA.
DIAL SET
A DIAL SET control provides for precise calibration of the frequency tuning dial. To perform this calibration, a signal of known
frequency, preferably from a frequency standard, is required. The procedure requires coupling of the signal to the antenna input
directly or by radiation to the connected antenna. The dial is then set to the known frequency. A “whistle” will be heard in the
transceiver output. The DIAL SET control is then adjusted to bring the “whistle” frequency to zero (zero beat).