LINEAR AMPLIFIERS MADE IN THE UK
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Gemini DX1200 1.8-70MHz Solid State Linear Amplifier
- 1.8-70MHz Solid State Linear Amplifier
- 1200W output 1.8-30MHz (1000W 50MHz, 400W 70MHz)
- Drive level 50W (10W/25W optional)
- Fully automatic band selection
- 3 antenna sockets
- Vacuum relay QSK switched
- Dual BLF188XR LDMOS
- Touch screen full colour display
- Network connected remote operation
- Quiet operation
- 10dBm pre-distortion output
- 100-260V 50/60Hz supply
- Dimensions 278w x 157h x 380d
- Weight 15Kg
DX1200 at CQWW CW Nov 2019 - user report:
If you are looking for a compact, quiet, rugged amplifier for base station, DXpedition or contest use then the new Linear Amp UK DX1200 1.8-70MHz Linear amplifier ticks all those boxes.
The DX1200 will give 1200W CW output on 1.8-30MHz, 1000W on 50MHz and 400W on 70MHz. The PA uses a pair (yes two) BLF188XR LDMOS which are operated at reduced voltage and with higher than typical bias so achieve low IMD and retain efficiency.
Three SO239 antenna sockets on the rear are selectable by band (Ant A is direct through when the amplifier is switched off). There is one SO239 input socket.
The DX1200 has fully automatic band switching - there is no CAT interface required.
The DX1200 uses a quiet vacuum relay for output switching enabling reliable full QSK operation (at >40 wpm) at full output.
A full colour touch screen display shows output parameters and is used to set up the antenna selection and other operating parameters. The screen has selectable colour options including high contrast green on black and white on black.
Full remote operation is possible via network using the software that is supplied free of charge. This mimics all functionality of the amplifier (excluding mains power switching) and incorporates Omni-Rig interfacing and audible voice commands for visually impaired operators.
Cooling - The DX1200 uses a ultra high surface area heatsink that occupies nearly half the volume of the entire amplifier. The main fan used is just 28.6dB(A) and is proportionally temperature controlled so heat is removed quietly and efficiently - it really is very quiet in operation.
The integral power supply allows automatic operation from 100-260V 50/60Hz so can be used worldwide.
DX1200 is small - just 278mm wide, 157mm high and 380mm deep (excluding feet and rear projections) and with 15Kg weight is manageable easily for portable and DXpedition use as well as in the shack.
A 10dBm (at 1000W) rear panel output is incorporated for pre-distortion or scope monitoring.
Finished in satin black the all aluminium chassis helps keep weight to a minimum whilst retaining strength (the front panel is 3mm material for instance)
Drive level as standard is 50W for full output making is compatible with most rigs. We can optionally supply the DX1200 configured for 10W or 25W drive.
SPECIFICATIONS:
Valid operating frequencies:
1.8 – 2.0MHz
3.5 – 4MHz
5.0 – 5.5MHz
7.0 – 7.3MHz
10.1 – 10.2MHz
14.0 – 14.4MHz
18.0 – 18.2MHz
21.0 - 21.5MHz
24.8 – 25.0MHz
28.0 – 29.7MHz
50.0 – 54.0MHz
70.0 - 70.5MHz
Power output : >1.2 kW at P1dB (1kW on 50MHz, 400W on 70MHz)
Power input: 10,25, 50W customer specified
3rd order IMD distortion: better than -30dB at 1kW
11th order IMD distortion: better than -70dB at 1kW
Harmonic suppression: better than 60dB (all harmonic products) (50dB on 50/70MHz)
Input VSWR: better than 1.5:1
Load VSWR tolerance: Max 2.5:1 high VSWR trip