Expert Electronics SunSDR2 DX - External Linear Amplifier Connection; External Device Control via EXT CTRL

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SunSDR2 DX User Manual

REAR PANEL DESCRIPTION

In the ExpertSDR2 DOT/RTS = DOT/CTS and DASH/DTR = DASH/DSR.

In the ExpertSDR2 you set COM-port pins of your PC, which uses DTR and RTS for keying.

DTR and RTS from PC should be connected to local DSR and CTS pins, which are showed on

the picture with the paddle. DSR and CTS are RX lines (inputs) that is why they used like this.

3.4 External Linear Amplifier

You can connect external Power Amplifiers (PAs) to the transceiver.

It may be required to make several connections depending on the required external PA type.

Connect a 50 Ohm HF cable to the transceiver's antenna connectors A2, A3 or A1 if it's a

VHF PA, connect the other end of the cable to the input of the PA.

To control the TX mode of the external PA you can use the X8 pin terminal of the EXT CTRL

connector (more details in EXT CTRL devices ).

If an external PA supports operation with the transceiver's ALC system, you can connect it via

cable with RCA-type phono plugs. The ALC voltage range -3...0 V (see the warning below).

Note:

While connecting the cables, transceiver and PA should be switched off.

Warning!

There is a small delay in the ALC-system functionality, which may lead to a short-

term overload of the external PA. This phenomenon could cause off-frequency

emissions or failure of your PA! The User of the transceiver should understand and

accept the above, taking responsibility for the potential consequences of using the

ALC-system. The manufacturer is not responsible for direct or indirect damages of

any kind from using the ALC-system.

3.5 External Control devices

The SunSDR2 DX transceiver allows you to control external devices via seven electronic keys in

the EXT CTRL connector.

With the keys you can have direct control of antennas, external band pass filters, external PA's

bands, HF preamplifiers, external transverter PTT etc. Commutation depends on the band and

RX/TX mode.

You can adjust Ext CTRL operation in the software Settings (more details in EXT CTRL ).

Note:

The Electronic keys have a built-in protection diodes for inductive loads (relays, fans,

solenoids, etc.) with a maximum reverse voltage of 75 V and current up to 200 mA (1N4148

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