microHAM micro KEYER 2R Manual page 10

TIP: All of the RE/SS jumpers are located on the bottom circuit board
just in front of the DC 12V input jack.
(23) – LNA2
Sequenced keying (bypass) for Low Noise Amplifier or receive antenna control on RADIO2.
Output (Solid State or RElay contact) depends on RE/SS jumper position.
Connector: RCA, when active goes to ground.
TIP – Signal
The output circuit is the same as shown for PAPTT2.
(24) – PTTIN1
Status input for sensing the state of RADIO1. Connect to the PTT output of RADIO1.
Connector: RCA
TIP – Signal
(25) – FS1
Footswitch 1 input (configurable function, by default keys RADIO1).
Connector: RCA, active when grounded.
TIP – Signal
(26) – PAPTT1
PTT output for Power Amplifier for RADIO1.
Output (Solid State or RElay contact) depends on RE/SS jumper position.
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
PAPTT1 jack. The transistor can switch up to 45V/0.8A. This position is appropriate for
modern Power Amplifiers with electronic keying. Check the manual of your amplifier to be
sure the power 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: 125VAC/2A or 60VDC/2A.
(27) – LNA1
Sequenced keying (bypass) for Low Noise Amplifier or receive antenna control on RADIO1.
Output (Solid State or RElay contact) depends on RE/SS jumper position.
Connector: RCA, when active goes to ground.
TIP – Signal
The output circuit is the same as shown for PAPTT2.
(28) – DC 12V
Power input.
Connector: 2.1/5.5mm coaxial
CENTRAL – Positive pole
Important warning: Be sure to observe the proper polarity!
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SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Ground
SHELL – Negative pole (Ground)
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