User Manual

Page 6 of 34
2-3. Connecting the amplifier within the shack
W A R N I N G
Before you connect the amplifier to external grounding, you
should advise with a licensed electrician and check-up whether
such kind of connection is allowed by the national and local
electrical code, safety rules, and regulations in force.
Simultaneous connection to the earth grounding and bonding may
be inadmissible or may fall under special requirements in some
countries!
W A R N I N G
Never use the gas installation tubing as grounding. This can cause
an EXPLOSION!
W A R N I N G
Do not use the steam-heating or water-supply network tubing as
grounding! Thus, you may involuntarily expose to dangerous
voltage not only yourself but also other people using the same
installation.
C A U T I O N
Have in mind that the grounding installation will have to withstand
emergency currents above 15A with minimal voltage drop on it thus it
may be necessary to improve its conductivity using heavier leads and
lower-resistive grounding path. The grounding lead should be at least
4mm
2
(AWG 11 or SWG 13).
For details and recommendation on the grounding and RF counterpoise system concerning the
electromagnetic compatibility see also S. 3-6(g).
a) GND stud - external grounding connection of the amplifier. After having made strictly all check-ups
described above, first connect the grounding stud of the amplifier (located on the rear panel and
marked GND – Fig. 2-1) to the grounding system of the shack.
b) KEY-IN jack - amplifier input for receive/transmit control from the transceiver.
The transceiver switches the amplifier from receive mode into transmit mode (RX/TX) via grounding of the
KEY-IN input.
Connect a shielded cable from the respective control output of your transceiver, providing “ground on
transmit” (PTT), to the KEY-IN input on the amplifier rear panel (RCA PHONO jack socket – Fig. 2-1). Use a
standard “RCA PHONO” jack plug for connection to the amplifier.
The manufacturers of transceivers give different names to this output, for example: TX-GND, SEND, T/R
LINE, RELAY, PTT, and others. At some transceivers “ground on transmit” output should be activated by a
software command, a menu or via changing a switch on the rear panel or inside the transceiver. See
instructions in the manual of your transceiver.
C A U T I O N
Before connecting the KEY-IN input verify the electrical specifications of
the transceiver control output (from its own manual) to make sure of
their compatability. The signal voltage applied by the amplifier KEY-IN
jack to the transceiver control output “ground on transmit” does not
exceed +12.6V against ground and its closed-circuit current is below
6mA. See also S. 8-2(a).
N O T E
Your amplifier will not work if the KEY-IN input is not connected
correctly. If you experience any difficulty consult your dealer.