Kenwood TS-700A Operating Manual page 22

removal can be effected, thus a clean information signal is
obtained.
Pulse noises (coming from ignition coils of cars) and
others which are distinctly at variance with normal signals
such as SSB in terms of frequency and amplitude are ac-
curately detected and removed. Not to be confused with
such noises are those resembling the normal signals: for ex-
ample, noise signals due to corona discharge or high-
frequency welders near-by or to high-power oscillations
(whose frequencies are outside but close to the IF band) in
adjacent apparatus are beyond the capability of the noise
blanker circuit. In this case, the desired signal will be dis-
torted with noise. The unit also includes adjusting circuits
for S", "RF" and "center" meters.
(9) HET Unit (X50-1300-20)
The 133 MHz band heterodyne frequencies are
available from this unit. The output frequency is produced
by mixing its 125 MHz with the 8 MHz input from the VFO
unit or with the frequency available from any of the crystal
oscillator fixed channels. The mixing circuit is of balanced
type. A band-pass filter (BPF) circuit which follows is to pre-
vent unwanted frequencies from leaking out of this unit.
(10) VFO Unit (X40-1080-00)
A perfectly shielded VFO consists of 2 FET's, 2
transistors and 2 diodes. It is extremely stable, equivalent to
that of the TS-900. Its adjustments are highly delicate; too
delicate for a person not skilled to attempt any re-
adjustment. For this reason, the user is advised not to dis-
turb the setting of this unit; the warranty on this model is
conditioned on the original setting.
(11) AF Unit (X49-1060-00)
This audio amplifier unit drives the speaker. The
received signal, modulated, flows through 2 stages of band-
pass amplification, 2 stages of AF amplification and 1 stage
of complementary amplification. The load impedance is 8
ohms.
(12) Power Supply Unit (X43-1240-00)
An AC bridge rectifier is included in this power supply
unit to make it meet both AC and DC needs. The DC 20V
supply to the FINAL and AF units is produced by means of a
voltage multiplier circuit working with a DC 13.8V input.
The regulated 9V supply is made available by an IC through
DC 13.8V. The above units are connected to each another
through the individual terminals properly marked for easy
identification. As a rule, the marking on each terminal cor-
responds to the name of the part of the units as shown in the
table 7 below:
22
Table 7
Marking
13.8V.
Description
13.8V
9V
—6V
Earth
Transmitter section
Receiver section
Variable resistor
Input
Output
Relay
Switch
Pilot lamp
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