FLEX-6000 Signature Series – FLEX-6000 Hardware Reference Manual
Page 27 of 48
Copyright 2016 FlexRadio Systems. All Rights Reserved.
7.6 TX RELAY OUTPUTS [1,2,3]
TX1, TX2 and TX3 (TX on FLEX-6300) are outputs for keying external equipment such as
amplifiers, external T/R switches, etc. They are all individual outputs, isolated from each
other. Refer to the SmartSDR documentation for explanation on how to configure the
timing for each output.
Δ – The TX Relay outputs are designed to handle signaling levels of up to +40 VDC @ 140
mA maximum. Some amplifiers do not have circuits to prevent keying voltage transients
and older amplifiers may exceed the maximum voltage level resulting in damage to the
radio if directly connected. Verify the voltage/current on your external device before
connecting to TX Relay 1-3. FlexRadio highly recommends the use of a use a
buffer/isolator box between the radio and the external device as a best operating
practice regardless of the keying voltage.
7.7 TRANSCEIVER ANTENNA PORTS [1,2]
Transceiver antenna ports are SO-239 50 ohm connectors. Refer to SmartSDR
documentation for explanation on how to select which port is active.
! - WARNING: THE FLEX-6500 AND FLEX-6700 ARE CAPABLE OF GENERATING RF POWER
LEVELS OF 100 WATTS. HIGH RF LEVELS WILL CAUSE SEVERE RF BURNS. NEVER TOUCH
THE TRANSCEIVER ANTENNA PORT, AN EXPOSED COAXIAL CABLE END, OR A CONNECTED
ANTENNA WHILE THE RADIO IS IN THE TRANSMIT MODE.
! – 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.
! – THIS UNIT GENERATES RADIO FREQUENCY (RF) ENERGY. USE CAUTION AND OBSERVE
PROPER SAFETY PRACTICES REGARDING YOUR SYSTEM CONFIGURATION. WHEN
ATTACHED TO AN ANTENNA, THIS RADIO IS CAPABLE OF GENERATING RF
ELECTROMAGNETIC FIELDS WHICH REQUIRE EVALUATION ACCORDING TO YOUR
NATIONAL LAW TO PROVIDE ANY NECESSARY ISOLATION OR PROTECTION REQUIRED,
WITH RESPECT TO HUMAN EXPOSURE!
7.8 10MHZ REFERENCE OUTPUT (W/GPSDO OPTION)
If the radio has the optional GPSDO, the 10 MHz reference output is a buffered 3.3V p-p
output of the 10 MHz oscillator in the GPSDO. The signal can be used to provide a reference
signal for external equipment. The connector is a female SMA.
Δ – CAUTION: USE CARE IN ATTACHING OR REMOVING SMA CONNECTORS. BEST
PRACTICE IS TO HOLD THE COAX WITH ONE HAND WHILE TWISTING THE SMA
CONNECTOR SHELL WITH THE OTHER. ONCE THE MALE AND FEMALE CONNECTORS
MATE, TURN UNTIL SNUG BUT DO NOT OVER TIGHTEN!
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