Technical characteristics for BLF188XR.
This 1400 W extremely rugged LDMOS power transistor for broadcast and industrial applications in the HF to 600 MHz band.
The BLF188XR and BLF188XRS are capable of withstanding a load mismatch corresponding to VSWR > 65:1.
In a range from 2 to 30MHz (test signal CW) BLF188XR, Pout is 1270W.
FEATURES of the module with LDMOS BLF188XR
- Model: PA Unit BLF188XR - ReV. 2015.2
- Frequency range: 1.8-50MHz
- RF power output: 1000W typical, 1200W max. 1.8-35MHz; 700W 50MHz.
- Modes Supported: FM, CW, SSB and others.
- RF power input: 7W typical, 10W max.
- Supply: 50-54VDC / 30-32A
- Board dimensions: 163 x 120 mm
BIAS adjusted in accordance with temperature.
Vbias: 12V for keying the amplifier
For better IMD, use negative feedback circuit.
Additional elements for AFC correction.
Input VSWR is optimized with attenuator on PA input.
The heat sink and a copper heat spreader (not supplied) have to be larger than 200mm x 140mm and proper fan cooling must be provided too.
You can use BLF188XRS. To do this, divide the Board into two parts at the specified line -
On 160m, 80m, 40m, 30m, 12m, 10m can be Pout up to 1200W. On 50MHz can be Pout up to 700W. On 70MHz can be Pout up to 500W.
To increase the gain at frequencies of 30-70 MHz is possible by changing the values of capacitors C21, C11, C48.
A full technical documents with all instructions on CD (in parcel) is provided with the board.
For a tech support, please E-mail me ut2fw(at)mail.ru
Pictures of ready LPF600 + PA Unit of the amplifier with BLF188XR -