I purchased the unit from a private party and the original owners manual was not available. Having the ability to download it was extremely helpful and clarified operating the equipment immensely. This is a complicated unit and without the manual I would not have been able to maximize it's potential. Thank you.
Being a user of older radios of many kinds, preferring them over more modern rigs, this manual was invaluable in the programming of my two. I now know for certain what the assorted buttons functions are, and am very grateful to have found this excellent site. Many thanks for your assistance, Tony.
5 star quality on these downloadable manuals. Easy to read and all the information is there. A must when doing a custom install or needing to service your precious old school electronics.
Text excerpt from page 6 (click to view)
Filter Block Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
AVDD
T1 2SC1740SQ R6 R5 C5 R11 C9 C10 C11 R7 R8
From CPU
To Amplifier
AG
AG
AG
Amplifier/Voltage Regulator (IC1: AN8053N) Consisting of an amplifier and a voltage regulator, AN8053N amplifies the sound signal from the CPU and also provides the CPU +5V source. The following figure shows the internal block of IC1.
5V VREG 13