Heathkit HW-12 - Page 46

Page 46
Mic d
© SPEAKER a
ae | Y
coupler is used between the antenna and Trans-
ceiver, The antenna used must provide a low
SWR (standing wave ratio) to the Transceiver
for successful operation, Lightning arrestors on
+h mta at ™
me antenna are a must, The antenna must
be grounded, and the Transceiver should be taken
off th ai i m i
off the air when a lightning storm is near.
mna, Do not uge an antenna that wil not
t
te
through a "peak" in TUNE. Connect aSWR bridge
to
he antenna and make sure the SWR is helow
om
® goo
Fw
to 1, Power for operating the bridge may be
ined by carrier output in the TUNE position
the FUNCTION switch,
Use an 8Q speaker capable of handling one watt
of audio power,
Three typical installations are shown in Figures
5, 6, and 7, Figure 5 shows a basic hookup
suitable for either fixed station or mobile op-
eration, Figure 6 shows a fixed station installa-
tion using a linear amplifier with a built-in
antenna relay switched by the Transceiver.
ANT _iNPUT RELAY |
RELAY CONTROL CABLE
eeanen
Owen |
POWER
—emm(_ | SUPPLY
1 20VAC
— os ee 5
Remember Wat one side of the EXT
RELAY socket in the Transceiver is connected
si
s, Ther ane it should not be con-
s for relay switch-
pavdan the Trananaienr
CauSé thé 1. ransceiver
ing. The AC vyoitage
chassis to be "hot,"" creating a shock hazard,
ba gigs :
The switching ci
If low voltage DC is used on the relay switching
line, be very careful to get the polarity of the
voltage connected vrovnerly, The grounded DC
Ee ON eee aia died Je Ne ~
lead must be connected to the outside (chassis)
of the plug,
Figure 7 shows a setup incorporating a linear
amplifier which does not have a built-in relay,
When using a separate antenna relay in this
manner, a Suitable isolation transformer must
be used to overate the relay and isolate the AC
line from the Transceiver chassis.
MOBILE
The preferred location for mobile operation is
under the dash, although you may desire to
120
AC
BIAS
cethy
—
RCVR
‘Lt
SPKR ] ra POWER 1
g,
COAX JUMPER
Figure 6