This board was created to enable the use of the latest LDMOS-FET's devices.
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.
- 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 200X140 mm and proper fan cooling must be provided too.
If you want to get 1000W Pout, you need very low input power, about 3-5W Pin. In this order, you need to be very carefully on first power on.
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 is provided with the board.
For a tech support, please E-mail me ut2fw(at)mail.ru
You can buy a Module with Heat sink and Copper plate - price 487$. This kit will greatly increase the weight of the parcel. Therefore will increase the cost of shipping (about 90$). If you want to buy this kit - make a request to my E-mail.
Pictures of ready LPF600 + PA Unit of the amplifier with BLF188XR -