microHAM MK2R Manual page 13

(20) – PTT IN 2: Amplifier Key line from RADIO 2.
Connector: RCA
TIP – Signal
NOTE: This connection is required to support VOX operation and PTT by software (CAT).
(21) – FS2: Footswitch 2 input (configurable function, by default keys RADIO2).
Connector: RCA, active when grounded.
TIP – Signal
(22) – PAPTT2: PTT output for Radio 2 Amplifier.
Jumper selectable Solid State or RElay output.
Connector: RCA, when active goes to ground.
TIP – Signal
If the jumper is in the SS position, the switching transistor (open
collector) is connected to the PAPTT2 jack. The transistor can
switch up to 45V/0.8A. This position is appropriate for modern
amplifiers with electronic keying. Check the manual of your
amplifier to be sure the PTT requirements do not exceed the
transistor rating. If the requirements exceed transistor rating set
the jumper to the RE position - this position connects the relay
contact to the output jack. Maximum rating for the relay is: 48V
AC/DC 1A.
TIP: All of the RE/SS jumpers are located on the bottom circuit board
just in front of the DC 12V input jack.
TIP: If you are not sure about the keying voltage of your amp or LNA,
use the RE position.
(23) – LNA2: Sequenced keying (LNA bypass or receive antenna control) for Radio 2
Jumper selectable Solid State or RElay output.
Connector: RCA, when active goes to ground.
TIP – Signal
The output circuit is the same as shown for PAPTT2.
(24) – PTTIN1: Amplifier Key line from RADIO 1.
Connector: RCA
TIP – Signal
NOTE: This connection is required to support VOX operation and PTT by software (CAT).
(25) – FS1: Footswitch 1 input (configurable function, by default keys RADIO1).
Connector: RCA, active when grounded.
TIP – Signal
(26) – PAPTT1: PTT output for Radio 1 Amplifier.
Jumper selectable Solid State or RElay output.
Connector: RCA, when active goes to ground.
TIP – Signal
Output ratings are the same as PAPTT2
microHAM © 2010 All rights reserved
SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Ground
13