2-2
Antenna Connection
The pin assignments for the input power connector are as follows:
The dc power connection between the TW7000 and its power source
should always be made as short as possible. If a DWC power cable is
not available, the following cables should be used: 14 AWG for runs
to 3 feet, 12 AWG for runs to 9 feet, or 10 AWG for longer runs.
The fuse holder (pin 346877) on the back panel contains a 25A, 3-AG
fuse, and a spare fuse of the same value.
Antenna Connection
The TW7000 is designed to work into a 50 ohm, RF impedance. The
output RF connector (antenna) is a PL259 UHF-type connector.
Broadband antennas and dipoles can be connected directly to this out-
put, while high-power amplifiers and antenna tuners use DWC spe-
cially designed 50 ohm cables. For specific connections,
refer to the
RF Cabling Accessories figure on page 2-11.
Microphone Audio Connection
Low-level audio accessories for use with the TW7000 include the fol-
lowing:
Two 6-pin microphone connectors are provided on the front panel of
the TW7000. The two connectors are wired in parallel and are suitable
for use by these audio accessories. The input impedance is a nominal
150 ohm. Most dynamic, ceramic, and magnetic microphones operate
with the TW7000. All DWC-supplied audio accessories have the cor-
Pin Number
Description
1
Return (ground)
2
12 Vdc
Part Number
Description
PM
Heavy-duty hand microphone
DM
Dynamic disk microphone
KEY
Morse key
EP
Headphones
EPL
Lightweight headphones