Extracts from KENWOOD Service Technical Report
No. E51-89-002 date FEB 10 1989
The talk power of the TS-790 is lower than previous models i.e. TR-851 and TS-811.
Not all versions of the RIG suffer from this problem. I have the TS-790A and the following modification was done when I purchased the RIG.
The report was sent to the following TRIO-KENWOOD offices.
T-K CANADA
T-K AUSTRALIA
T-K NV,SA
The following is quoted from the Service Report.
To boost the talk power of the TS-790 to almost the same level of the former models surpress the ALC response like the former models.
Connect a 0.039 to 0.047 uF between pins 6 and GND of IC201 on the ALC amplifier daughter unit (X59-3480-00 (F)).
| *NOTE: | This above alteration distorts the SSB transmission signal quality. Thus the alteration will not be applied to mass production. |
End of quote.
The mode was done on my RIG from the factory and I have had no reports of poor audio!!
The following white noise check is shown in the Service Report.
| ORGINAL | ALTERED | |
| Low ALC level | 1 to 1.5 W | 2.5 to 3.0 W |
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