7" Touch Screen PA-Controller
Connections
These are the available connection and their purpose:
| Name | Function | Description |
| SH+ | + SHUNT | If you want to measure a current of the e.g. station supply, you insert a shunt resistor into the positive supply line. This pin is connected to the shunt on the side facing the power supply. See note-2 |
| SH- | - SHUNT | and this to the side pointing
to the load. This input can also be used vor current measurement via the DC safety switch |
| GND, PS+ | Voltage mesurement of the power supply | Voltage measurement input. This connector can be connected to a positive voltage (up to 100V) to make a voltage measurement, e.g. of the station power supply. See note-3 |
| UBAND | TFP filter band selection | ICOM devices output a voltage whose level corresponds to the selected band. This function can be used alternatively |
| IN-FWD IN-REV |
Input SWR coupler | Input power measurement |
| FLT-FWD FLT_REV |
Filter SWR coupler | SWR measurment on the TPF input side to detect incorret filter selection |
| ANT_FWD ANT_REV |
Output SWR Coupler | Output and antenna SWR measurement |
| NTC2 | TFP temperature | NTC temperature sensor B57703M103G (10kohms) |
| NTC1 | PA heatsink temperature | NTC temperature sensor B57703M103G (10kohms) |
| ALC | Automatic Level Control for TRX | Analog output with a negative ouput voltage to limit TRX output power level |
| PSoff | DC power off | This ouput is high impedance in normal operation. In an emegency situation or manal turn off request, this terminal is pulled to GND |
| ANT1 ANT2 |
Output antenna selection | These output are used to control the output antenna selector. See note-4 |
| PTT out | PA TX control | Connected to the PTT input of the power amplifier (open=RX, GND=TX) |
| PTT in | PA TX control | Connected to the TRX selector input module (open=RX, GND=TX) |
| PSon | DC power on | This ouput is high impedance in normal operation. In an power on request, this terminal is pulled to GND |
| PS pre | Power supply soft start | After the bootup of the controller, this output is pulled to GND. A relay conneccted to this ouptut will short the softstart resistor on the PSU input |
| TX RX |
RS232 interface | Universal RS-232 interface. Used to flash new firmware versions into this device or for remote control |
| CI/V | Icom interface | If this connector is connected to an ICOM transceiver, the tuned frequency is read out and the matching antenna is switched on (if an antenna switch is available). |
| +12, GND | Supply power | 12V supply power for the controller card |
| 80m 40+60m 30+20m 17+15m 12+10m 6m |
TFP band relays | Connection to a relay (via a driver transistor) to activate the
corresponding band in the output filter. This output goes to
3.3V when activated. When no output is active, the 160m
band is selected. These outputs can have 5 different band
configurations which are selectable in the SYSTEM menu of the firmware, so most different filter-band combinations are possible. |
| TRX-1... TRX-4 |
Active TRX indicator | Indicates the currently selected input (in conjunction with the TRX selector module) |
| BOOT | Bootloader | Connect these two pins with a jumper and switch on the power supply. The controller goes into bootloader mode and waits for a new firmware via the serial interface. |
| ST5 RES | WIFI reset | connect briefly to reset the WiFi interface. |
| ST6 PGM | WIFI AP mode | When switching on with plugged jumper the WiFi interface starts its own AP (access point, no assword). A WLAN device (PC, smartphone …) can log on to this AP. Open a browser and enter this IP: 192.168.1.4 to display the controller web server and configure the WiFi. |
| X1 | WIFI serial connection | WiFi interface is connected to the controller and the built-in
web server displays the controller status and values. Aserial interface (3.3V levels !!!) can be connected here to flash new firmware into the WiFi interface. DO NOT connect directly to a PC RS232 interface, always use a voltage converter ! |
| ST3 | ST-Link | Connection for the ST-Link programmer / debugger |
Note-1: Measurement coupler
This device can process the measuring voltages of up to 3 power/SWR measuring couplers.
The measurement couplers must output a voltage which is proportional to the power in dBm. This is
the case for all high-quality measurement couplers based on the Analog Devices AD8307. Also selfmade
measurement couplers can be used.
Note-3: Voltage measurement ranges
This board supports four measuring ranges: 50V , 100V, 1000V, 4000V
The ranges 50V and 100V are supported by resistors which are already on the board. For the ranges
1kV and 4kV (intended e.g. for tube amplifiers) the following voltage dividers must be connected
additionally:
| Range | |
| 50V | Close jumper on board |
| 100V | Standard |
| 1kV | Add additional voltage devicer |
| 4kV | Add additional voltage devider |
External voltage divider:
Rp : connect between pins Um and ground
Rv : connect between the voltage to be measured and pin Um
1kV range: Rp=5,6kohm, Rv=2,2Mohm
4kV range: Rp=4,3kohm, Rv=6,8Mohm
Note: these two resistors must be connected as close as possible to the voltage to be measured to
keep high voltage away from this board !
Note-4: Antenna Relay
This device supports three measurement couplers, one of these measurement couplers can be
additionally connected to relays to connect up to 3 antennas to this coupler. Usually this is done for
the shortwave range. So you use measurement coupler-1 for shortwave and connect its output to a
relay board. The relays are then switched on automatically depending on the selected band. In
combination with the CAT (CI/V) interface a completely automatic antenna switching is possible.
The relays are connected from connector ANT1 and ANT2 each against +12V.
Note-5: ON/OFF relay for power supply
There are two connections which can switch 12V relays directly (return diode is already present on
the board).
POWER SUPPLY ON:
As soon as you turn on the power, this connector goes to GND, so a relay is energized, the controller
is in “Standby”. If you switch the controller to “active” to start transmitting, this connection becomes
high impedance again, a relay would drop out again.
The reason for this is an important safety function: You connect a relay in latching mode here. In
“active” mode this output is dropped out, but because of the latching the relay remains energized. In
case of any failure in the power supply, the relay can drop out by itself and is no longer forced to
“ON”. So after a fault, the PA remains off and will not turn on by itself.
POWER SUPPLY OFF:
this connection is high impedance during operation, so a connected relay drops out. In case of an
emergency shutdown, the connection goes to GND, so a relay picks up.
