Transmission (I) - Kenwood TS-930S Instruction Manual

5.3 Transmission (I)
This section covers adjustment of the transceiver for
transmission.
1. Transmission output impedance
The TS-930S transmission output impedance is 50 ohms.
Use only a 50 2 antenna, and coaxial feed system.
2. SWR
Adjust antenna SWR to 1.5:1 or better. With the AT-930
Auto Antenna Tuner installed, it is possible to impedance
match the antenna to the transceiver within the range of
20 2~150 2 (However, 30~100 ohms for 18 MHz and
24.5 MHz.). In all cases, it is recommended that antenna
SWR is below 1.5:1.
3. Antenna terminal
Never operate the transmitter when the antenna terminal is
open (neither antenna or dummy load connected).
To test the transceiver, use a 502, 100 W (minimum)
dummy
load.
If you perform ON-THE-AIR
test transmis-
sions with an antenna, you may become the cause of
interference with other stations on the band.
4. Initial setting
Refer to Table 5-2 for initial transmitter switch settings.
Table 5-2 Control and switch setting for transmission
(Set the Remaining controls as listed in Table 5-1.)
[sence [Peston [Seen [Poston |
AND switch [To died bord] AT ewich | OFF —_|
SwrdByowich | REC | AUTOewach | _oFF |
[MODE wich [cw | procewicn | _orr _|
IMerenowten [| ae - | - |
Table 5-2
5. Antenna-tuner
If the TS-930S is operated into an antenna with a high
SWR, the final stage SWR protection circuit may operate
(when SWR is greater than approximately 2:1). Therefore,
use the AT-930 Auto Antenna Tuner or AT-230 (option)
when antenna SWR is beyond nominal limits.
To operate the AT-930 Auto Antenna Tuner, place the
MODE switch to TUNE, AUTO—THRU switch to AUTO
and then transmit. Adjust the CAR control so the ALC
meter deflects slightly. If, after changing bands, the auto
antenna tuner does not stop at match within a reasonable
time (within 20 seconds), momentarily return to the
receive mode, and then again operate the tuner for a
match. The tuner is capable of matching a 20 — 1502
load, or approximately up to a 2.5: 1 VSWR. (However,
30~ 100 ohms for 18 MHz and 24.5 MHz.)
If the antenna and feed system exceed this range, the tuner
may not stop, since it is beyond the auto tuner's capability.
lf the tuner does not stop within 20 seconds, discontinue
22
auto-tuner operation and verify the VSWR of your system.
Some adjustment to the antenna may be required to bring
the radiating system within the tuner's capability.
Note:
When adjusting an external antenna tuner other than the
AT-930, place the transceiver MODE switch to TUNE for
reduce transmitter output.
5.4 Transmission (II)
To obtain maximum transmitter performance from your
TS-930S you should understand the proper operation of
the following controls and switches.
1. SSB transmission
(1) Connect a microphone to the MIC input. .
(2) For operation up to the 7 MHz band, place the
mode switch to LSB. For operation on or above
the 10 MHz band, use the USB mode.
(3) Place the METER switch to ALC, and the standby
switch to SEND, or use the microphone PTT
switch (if provided).
(4) Adjust the MIC gain control for an on-scale ALC
reading on voice peaks. (Disregard power and IC
meter readings in SSB- they are not accurate or
relevant.)
SSB operation
soe POWER
SEND ALC Si Swe cry
comp. 1c
c
4 re reer
MIC ~@ CAR
MIC gain control
Adjust so the ALC meter
deflects slightly on voice
peaks.
2. CW transmission
(See page 24, CW operation, for details.)
(1) Using shielded
line, connect
a key to the rear-
panel KEY jack.
(2) Place the MODE switch to CW, and the meter
switch to ALC.
(3) Place the standby switch to SEND.
(4) Depress the key and adjust the CAR control for 4
half scale ALC reading (see Figure 5-7).