Red Pitaya HAMlab, User Manual, Page: 105 / 116

HAMlab, Release 1.0
Note: This input is not protected by any ESD circuitry, therefore device connected to the RX1 OUT Output is
susceptible to possible damage by ESD from an EMP event if the connected device does not have adequate ESD
protection circuitry.
Warning: Be aware that Preamp1 and Preamp 2 are both wide band amplifiers covering the whole bandwidth of
55MHz. It is not recommended to use the Preamps on a large Antenna without a Preselector connected (this would
cause overload and intermodulation from strong broadcast signals outside the Amateur Radio Bands)!
AUX2
RX2 IN - secondary 50ohm receiver input that can be used as a second panadapter in Power SDR software or to as
feedback signal for pre-distortions (Pure Signal tool).
XVTR (TX2 OUT) - secondary transmitter can be used to drive external PA Max. output power is around 10 dBm @
50ohm.
However, currently there is no support in HPSDR for a second TX output.
Power and Fuses
The HAMlab 80-10 10W is designed to operate from a 13.8 volt nominal DC supply and required at least 4A.
Danger:
This unit must only be operated with the electrical power described in this manual. NEVER CONNECT
THE +13.8VDC POWER CONNECTOR DIRECTLY TO AN AC OUTLET. This may cause a fire, injury, or
electrical shock.
The HAMlab 80-10 10W requires 13.8 VDC @ 4 A measured at the radio in order to transmit maximum wattage.
Multiple power cable connections between the power supply and the HAMlab 80-10 10W, a poorly regulated power
supply, undersized power cable and very long power cable lengths will result in a voltage drop, especially under load.
Any voltage deviation from 13.8 VDC will result in lower power output that the 10W nominal specification.
For best results, select a linear or switching power supply that is well regulated and free of internally generated
radio frequency noise. “Birdies” generated by a poorly filtered supply can often appear as signals in the Power SDR
Panadapter display.
The Anderson Powerpole™ connector contains 45 Amp pins to minimize voltage drop during transmit. The RED
connection should be connected to the positive (+) lead of the power source. The BLACK connection should be
connected to the negative (-) lead of the power source.
I - If you choose to use your own Powerpole cabling, be sure to properly size the wire and the Powerpole connector to
minimize voltage drop during transmit. Excessive voltage drop can cause lower transmit power output levels.
There are two internal fuses in the HAMlab. One is protecting whole system while the other one is just for the
transceiver. If you ever need to replace the internal fuse, remove the top cover and the shield of the power board.
5.7. Back panel controls and connections 101