Kenwood AT 50 Owners Manual

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TABLEOFCONTENTS

1. FEATURES .............................................................. 2
2. SPECIFICATIONS AND ACCESSORIES ..................................... 3
2-1. Specifications ........................................................ 3
2-2. Accessories ......................................................... 3
3. INSTALLATION ........................................................... 4
3-1. Fixed Station ........................................................ 5
3-2. Mobile ............................................................. 5
4. CONNECTION WITH TS-SOS ............................................... 6
4-1. Connection Details ................................................... 6
4-2. Operation in Automatic Mode .......................................... 7
5. CONNECTION WITH TRANSCEIVERS OTHER THAN TS-5OS ................. 10
5-1. Connection with TS-BSOS, TS-6QOS, OR TS-4508 ....................... 10
5-2. Connection with Transceivers other than TS-SSOS. TS-GQOS, and TS-4508 11
5-3. Operation in Semi-Automatic Mode ................................... 12
5-4. Operation in Local Automatic Mode ................................... 14
6. PRESEI' MEMORY FUNCTION ............................................ 16
7. SWR INDICATION ........................................................ 17
8. HETERODYNE FREQUENCIES ............................................ 17
9. MAINTENANCE .......................................................... 18
9-1. GENERAL INFORMATION ........................................... 18
9-2. SERVICE ........................................................... 18
9-3. CLEANING ......................................................... 19
9-4. IN CASE OF DIFFICULTY ............................................ 19

1.FEATURES

The AT-50 antenna tuner was designed for use with either a mobile or fixed
station transceiver. Principal features of the tuner include the following :

0 Coverage of all Amateur bands from 1.8 through 29 MHz provides total
operating flexibility.

O The AT-50 Automatic mode allows quick, hands-off tuning of your antenna
system when you use the tuner in conjunction with your matching TS-SOS
transceiver.

O The Semi-automatic mode, when used with transceivers other than the TS-SOS,
functions with minimum operator intervention by automatically sensing the
presence of your transmitter's low level RF signal. Or. select the Local
Automatic mode from the AT-50 front panel for maximum personal control while
still taking advantage of the automatic tuning circuitry.

0 Storage of all preset tuning positions in EEPROM improves reliability by
eliminating the need for any backup battery.

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(A) (B) (D) (C)
AT-50 LED Indicators
LED Function
CDAUTO/THRU Lights in AUTO mode. Off in THRU mode.
®TUNE Lights when tuning or presetting is in progress.
Goes off when tuning ends.
@AUTO r Lights in the Semi-automatic mode.
GAB AND P Lights for the band currently selected by the automatic band identification
\J
feature. '
Lights when the power is too high during tuning. The THRU mode is
(5) ALARM selected and the AUTO/THRU LED goes off.
Lights when tuning does not finish within the maximum tuning time.
Goes off when transmit carrier stops.

Key Functions

Key Function
(A)AUTO/THRU Selects AUTO or THRU mode.
i
(B)TUNE Not functional in the Semi-automatic mode.
(C)BAND UP Selects the next higher amateur band.
(DlBAND DOWN Selects the next lower amateur band.

I [BAND] keys

Pressing the [BAND UP] key while in the 28 MHz band or the [BAND DOWN] key while in
the 1.8 MHz band selects the Semi-automatic mode and the AUTO LED lights. if the
[BAND UP or DOWN] key is pressed in the Semi-automatic mode, the AUTO LED goes
off. and Local Automatic mode is selected.