This is a CAUTION NOTE for use when wiring your
own connector for the cable to your transceivers ...
The +V wire on the unterminated end of the
cable going to your transceiver is HOT, meaning that +12V is being
supplied to the radio when the modem is being powered.
The +V wire is red on Type A cables, and
brown on Type B cables ... see
http://www.nue-psk.com/cables to identify which type of cable was
provided with your modem.
The normal use of this line is for the modem
to supply power to a small transceiver like the PSK-xx boards, or
conversely for the rig to supply power to the modem. This way you could
conveniently eliminate a second battery or power cable from your station
set-up.
But you cannot do BOTH ... i.e., you cannot
connect the hot +V line from the modem to the rig connector that also
supplies voltage out its accessory/data jack! One of the two devices
will certainly lose the battle and fail.
(One NUE-PSK modem owner mistakenly attached
the +V line on the modem cable to the +5V pin on his transceiver's mic
connector. Thus, we think his K2 is damaged.)
IF DESIRED ... You can safeguard against
this condition by cutting the "Y" trace on the PCB near the J3
connector, as described in the manual. This eliminates the flexible "remote power" feature, but
perhaps protects against inadvertent wiring.
Otherwise, please be careful when
interfacing the modem to your transceivers. In the next round of the
modem production, we will make the default condition "open" for this
onboard jumper on the PCB.
And as always, please ask first if you have
any questions about interfacing the modem to your rigs.
73, George N2APB
& Milt W8NUE
