Band selection
The Gemini HF-1K has fully automatic band selection. As you transmit the
amplifier detects the frequency of the tranmission, checks to see if it is within
the current band and if not changes the band of the amplifier automatically.
The chageover procedure is cold switched and occurs in a few ms.
The amplifier contains a list of valid frequency ranges. If the transmit
frequency is detected outside the valid range (ie out of band) then tx is
inhibited and a pop up ‘Out of Band’ warning appears
Note that if you intend to operate on 472KHz then you will need to provide an
external low pass filter with suitablt performance and rating for the power
output intended.
QSK
The amplifier incorporates a diode switching circuit allowing silent full break in
cw operation. The amplifier wil maintain an undistorted CW keying envelope
even at speeds in excess of 50wpm. QSK operation is an integral part of the
amplifier design and does not need to be selected on or off manually.
Cooling
The amplifier contains several temperature controlled cooling fans. In addition
there is one low noise fan that runs all the time. The main fans will increase or
decrease speed in linear fashion proportional to the temperature controlled
over a temperature profile pre-programmed into the temperature control
module in the amplifier. The main fans will not turn on until 40C and will then
ramp up over a non-linear profile to be at maximum at 65C heatsink
temperature. Fan speed control is automatic and independent of the tx/rx
state of the amplifier.
Protection Circuits
The amplifier has several protection circuits built in:
Overdrive
The amplifier monitors input drive level. If drive level is exceeded then the
overdrive circuit is activated inhibiting the PTT, causing the amplifier to lock
out onto receive mode and an overdrive trip pop-up warning will be shown.
You can clear the trip by touching the trip pop-up on the screen.
Check your rig!
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