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World of Ham Radio 1997
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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 <<<
==============================================================================
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
==============================================================================
BULLETIN # 855
MODEL: TR-8400
SUBJECT: Transmit Delay Time
PLL lockup time when switching from receive to transmit may be shortened
for faster transmitter response. This change applies to units before
serial number 1060455.
On the PLL unit X50-1670-xx, check the values of R31 (390 ohm) and C47, C48
(6.8uf) near Q7 and Q8. If these component values differ, change as
required. This will give approximately a 0.12 second delay, which should
be satisfactory for practical use. However, if shorter delay is required,
replace R31 with an 820 ohm resistor. This will yield an approximate 0.096
second turn-on delay.
No adjustment is required after this part change.
Note: When R31 is 820 ohms, CTCSS (Subtone) will be slightly distorted.
Installation time for this procedure is 1/2 or less.