Specifications

Page 12
Copyright 2006 Robert A. Larson, KC9ICH
4) Release P. A. Cathode / S-Meter switch and again push Tune / Rec switch down. Quickly peak P.A. Tune Control for
maximum reading on meter. (Meter is now reading relative power output). Release switch.
5) Once again, push Tune Rec switch down and quickly peak PA. Load to maximum meter reading. Release switch.
6) Push Tune / Rec switch down and re peak the P.A. Tune Control. Release switch.
If a calibrated wattmeter is in the antenna line, it should read 70 watts or more when the set is properly tuned - up (Tune /
Rec switch in tune position).
You have now completed the transmitter tune - up procedure. If you desire to change frequency and move the dial more than 50 KHz,
it will be necessary to re peak the P. A. Tune, P.A. Load, and Preselector Controls Steps 3 through 6.
CAUTION
PROPER TUNING AT ALL TIMES IS EXTREMELY IMPORTANT. IMPROPER TUNING WILL CAUSE PREMATURE
POWER AMPLIFIER TUBE FAILURE.
If the receiver is operated with the Band Switch in the 27.0 REC position and the Preselector, P.A. Tune, and P.A. Load controls are
adjusted for maximum receiver sensitivity, it will be necessary to retune the transmitter when returning it to operation with the Mode
Selector in the 28.5 XCV position.
OPERATION
RECEIVING SINGLE SIDEBAND
In the following instructions, it is assumed that all proceeding Preliminary Checks, P.A. Bias Adjustment and Transmit Tuning
procedures have been accomplished as instructed.
Place the Mode Selector Switch in the USB or LSB position as desired. Turn the A.F. Gain Control clockwise to the 3 o’clock
position. (If the unit was not previously turned on, wait 30 seconds or more for the tube filaments to warm up). Check that the Carrier
Insertion Control is at MIN. Turn the main tuning dial to the desired frequency indication and then carefully adjust the preselector and
P.A. Tune Controls for maximum noise output. Readjust A.F. Gain Control as necessary to increase or decrease receiver output to a
comfortable level,
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.
In practice, the receiver will often be tuned across the band until a signal is heard to which the 1011D operator will want the 1011D
transmitter stages tuned. Adjusting the Preselector and P.A. Tune controls for maximum S-Meter indication will provide this tuning
while listening to the received signal.
If there is ignition or atmospheric noise present that interferes with the received signal set the ANL switch to the upper position. This
will activate the Anti Noise Limiter to limit the peak excursion of the noise in the receiver audio circuits.
RECEIVER TUNING (SSB)
Precise tuning of a single sideband signal is very important. Do not be satisfied to merely tuning until the voice can be understood,
but take the extra care of setting the dial to the exact spot where the voice sounds natural. Above all avoid the habit of tuning so that
the voice is pitched higher than normal. This is an unfortunate habit practiced by quite a number of operators.
The following points help to explain the effects of mistuning:
1) If you tune so that the received voice is higher than normal pitch, you will then transmit off frequency and your voice will
sound lower than normal pitch to the other station. He will probably retune his dial to make you sound right. If this
continues, you will gradually ‘‘waltz’’ one another across the band. If you are both mistuning to an unnaturally higher
pitch, you will “waltz’’ across the band twice as fast. And someone will, no doubt, be accused of frequency drift.
2) Mistuning results in serious harmonic distortion of voice, and should be quite noticeable to the average ear. Some will claim
that if they don’t know how the other person’s voice actually sounds, they can’t tune him in properly, but this is not true.
With a little practice it is quite easy to tell. Some voices are rich in harmonics, and are easier to tune in than a person with a
‘‘flat’ voice. Also, a transmitter operated properly, with low distortion, is easier to tune in than one which is overdriven and
generating excessive distortion. You will know when you have a station tuned in right on the nose. It will sound just like
“AM”, so to speak. Mainly, avoid the habit of tuning so everyone sounds higher than normal pitch, or like “Donald Duck”.
This is incorrect, unnecessary, and irritating to the ear.