Hello folks:
After a exchange of e-mail with Dale, KG5U, I decided to post this short
note as he'd queried me direct about what causes processor death in the
2591, TT920, and AT920 handheld Ten-Tec VHF transceivers. As noted
before, the main processor chip for these rigs is no longer available
and cannot be replaced should one quit operating.
According to our service department, the main cause of processor death is
application of 12 or 13.8 VDC to the transceiver. The battery pack and
DC input for these rigs are 9 VDC, and higher voltages will eventually take
the processor chip out. These older rigs show up at hamfests without a
manual, new owner sees DC input, puts 12V on it, voila - dead radio.
A lesser warning is to leave the power turned off when clipping the NiCd
battery pack on (as noted in an addendum to the original manual).
Thank you !
Scott Robbins, W4PA
Amateur Radio Sales, Ten-Tec, Inc.
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