Internal Cross Channel Operation; 17 Mobile Operation; Rtty Operation - Kenwood TS-820 Operating Manual

The crystal frequency is determined by the following formu-
las.
C•ystal Frequency (MH z)
=
5.5 MHz
+
X - Operating Fre-
quency (MHz)
X
1.8 for the 160 meter band
X
3.5 for the
80 meter band
X
7.0 for the 40
~nete r
band
X
14.0 for the 20 meter band
X
21.0 for th e
1
5 meter band
X
=
28.0 for the 10 meter band or
X
28.5 for the
1
0 meter band or
X
29 0 for the 1 0 meter band or
X 29.5 for the 10 meter band
Crystal Specifications: HC-25/U holder. 5.0 to 5.5 MHz os-
cillation frequency, and see Figure 9 for type of oscillation
circu it.
Example: Desired Operating Frequency
=
7.2 55 MHz
Crystal Frequency
=
5.5 MHz
+
7.0 MHz -
7.255 MHz
=
5.245 MHz
This same crystal will operate on each band.
Operating Frequency
=
5.5 MHz
+
X (in MHz)
Crystal Frequency
(in
MHz)
Example: Crystal Frequency
=
5.245 MHz
On the 14 MHz band the crystal will oscillate at
Operating Frequency
=
5.5 MHz
+
14.0
5.245 MHz
= 14.255 MHz
4.16 INTERNAL CROSS CHANNEL
O PERATION
The TS-820 contaans a un•que design feature which allows
cross channel operat1on without a separate external VFO.
The TS-820's internal VFO is used together with th e fixed
freq uency oscillaltor to ~llow reception and transmission on
different frequenc •es. The fix ed channel oscillator must have
one or more accessory crystals installed for this feature to
work.
PCTION
TRA NSMI T RECEIVE
WITCH CONTROL
CONTROL
VFO VFO VFO
VFO .A
Fixed chunnel
VFO
oscillator
F I X .R VFO
F •xed· ch;,11nol
osc •llator
F I X
Fixed channel Fixed channe l
osc•llator
oscillator
22
4 . 17 MOBILE OPERATION
The compac t size and solid-state design of the TS-820 make
it 1dcal for mobile use. by using optional DS- 1.
Be sure
to
use a mobile antenna w hich meets the require-
ments described in Section 2.
The normal operating procedures. described previously, ap-
ply
to
mob•le operation. The noise blaker should be used to
reduce ignition and impulse noises for clear reception. Re-
member that during transmission the transceiver draws
about 15 amps so be careful not to drain the car's battery.
4 .1 B DX OPERATION
(Use of PROCESSOR)
In
OX
f!ong distance) operation, it may be desirable to in-
crease the talk- power by using the speech processor. The
speech processor used in TS-820 converts voice signals into
455 kHz SSB signals for compression at quick time cons-
tant.
h produces little distortion and. unlike the clipper system
does not deteriorate the tonal quality.
The compression level can be adjusted with the COMP
LEVEL knob. Set the meter knob to COMP and adjust so
that the meter indicates anywhere within the scale (2.0 ......,
40 dB). The speech processor is used only for OX opera-
tion.
In other operati ons such as local QSO. press in the
CO M P LEVEL knob so t hat signals can be heard more natu-
rally.
4.19 RTTY OPERATION
For RTTY operation. the use of demodulator and
teletypewriter is essential. The demodulator should be de-
signed to operate from audio inputs and equipped w ith a fi l-
ter for· 2 12 5/ 2295 Hz (NARROW. 170 Hz shift) or
2125/2975 Hz. (WIDE, 850Hz shift).
To key -in the FSK circuit of TS-820. insert a relay coil into
the closed loop circu it of teletypewriter and connect the re-
lay contact to the RTTY KEY jack on the rear panel. Fig. 10
shows the relationship between the transmit and rece ive fre-
. (lUencies of TS- 820.
The frequency shi ft of the FSK circuit is preset at t he factory
to NARROW but it can be changed to WIDE by inserting the
connector as shown in Fig. 11 . When operat ing at the
WIDE position. turn the IF SHIFT knob in the"-" direct ion
by about 1.2 kHz so that the mark and space signals are well
balanced during reception. If a CW filter (option) is used for
NARROW operation. change the position of the connector of
the IF unit (refer to "Operation with CW Filter").
Setting the MODE switch to FSK automatically decreases
the input power of the final stage, permitting a long time of
continuous operation.