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                             K E N W O O D
   >>>   A M A T E U R   R A D I O   S E R V I C E   B U L L E T I N   <<<
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                        Kenwood Service Centers

   Kenwood Service Corporation             Kenwood Service Center, East
   2201 East Dominguez Street              829 Lynnhaven Parkway, Suite 130
   Long Beach, California 90801            Virginia Beach, Virginia 23452
   Telephone 1-310-639-5300                Telephone 1-804-340-1702

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BULLETIN # 41
MODEL: SM-220/BS-8
SUBJECT: ALIGNMENT WITH THE TS-180


The SM-220/BS-8 scope combination are fully compatible with the TS-
180S transceiver.  However, as the TS-180S does not have a 25kHz
calibrator, BS-8 alignment will not be in accordance with the SM-220
Operating Manual.

Procedure:

Install the BS-8 in accordance with the SM-220 Manual, however, leave the
scope covers off until step 1 is completed (If input alignment.)  See note
1.2.

Perform steps 8.4.1, 8.4.2. steps 8.4.3, 8.4.4 do not apply to the TS-180S.
After step 8.4.2. continue:

1.   With the Marker ON, turn the transceiver ON, and in the USB mode, any
band, you should hear the scope Marker directly injected into the IF.
Peak T201, the BS-8 input IF transformer, for maximum signal into the TS-
180S.  This transformer is not shown in Fig. 8-2, but is the only other
adjustment on the BS-8, and is located below the three identified sccess
openings.  If you cannot hear the Scope Marker in the TS-180S, turn the
marker off and tune a local station on the 1.5 MHz band.  Peak the drive
control, and then peak T1 in the BS-8 for maximum amplitude at scope center
and equal roll-off at the display edges.  See note 1 Page 2.

2.   Turn of TS-180S, 1.5 MHz band, and tune to the local AM broadcast
station nearest 1.6 MHz.

3.   Enter this frequency in the M1 Memory.  Depress the DSP/Diff
pushbutton for a differential display.

4.   Tune up and down approximately 100KHz, observing the scope display.
Note the verticale displacement of the original frequency to the left and
right.  If equal, or linear displacement is obseved, stop.

5.   If the display does not shift equally when tuned up or down frequency,
adjust VR202 for linearity of scan width.  Then reset to the center
frequency (by the cope Marker or retuning the transceiver).  Reset TC201 if
necessary.  Repeat two or three times for correct scope center frequency,
and linear display.

6.   Turn the TS-180S off, and the scope marker on.  Switching between
100khz and 20khz scan widths, the marker should appear at scoep center, and
should not shift.  Repeat step 5 if there is a shift.

Notes:

1.   A Bs-8 previously aligned to a TS-820 or TS-820S need only have step  
     1., input alignment, performed.

2.   Preset TC201, VR201, VR202 at their center.  When alignment is
complete, these adjustments should not be at their extreme limits.  This
will result in unstable Pan display operation.  Rather, they should be
somewhat within their center range.

Please make these changes in your service manual.