Red Pitaya HAMlab User Manual page 91

Danger: NEVER CONNECT OR DISCONNECT ANTENNAS WHILE IN TRANSMIT MODE. THIS MAY
CAUSE ELECTRICAL SHOCK OR RF BURNS TO YOUR SKIN AND DAMAGE TO THE UNIT.
AUX1
RX1 IN - direct feed to the first receiver pre-amp and attenuators.
RX1 OUT - an output from the antenna feeding
By default HAMlab 80-10 10W comes with loopback cable connected from RX1 IN to RX1 OUT. User can also use
this two connectors to insert external filters or preamplifier.
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.
4.7. Back panel controls and connections
HAMlab, Release 1.0
87