4 x BLF188XR LDMOS BOARD LINEAR AMPLIFIER VERY HIGH POWER
A very high power solid state linear amplifier board. This board is designed for four LDMOS-FET's BLF188XR operating in a push-pull circuit. These boards are the result of a long R&D and many experiments into. LDMOS FET high power linear amplifiers. And using 4 devices was not a simple design task. Each node in the PP circuit uses 2 devices so. Without real strain on devices. I have revised my design many times with.
Too to improve matching and IMD figures. The board features a high power transmission line transformer wound on stacked ferrite toroids.For lower IMD, lower saturation. The dual sided 3 oz. And is 14 cm x 27 cm in size. All critical RF capacitors are ATC and silver tabs rf caps from Murata for best rf performance. Efficient feedback circuitry ensures stable clean broadband operation. Imax up to 125A \. Bias is regulated on-board and thermally compensated. Thermal tracking of bias is also provided on board. This is a populated board but without the active LDMOS devices. The board is supplied ready for your devices to be dropped in. These are very high power boards. The board has enough "headroom" to cover up most minor operating mistakes. The LDMOS devices with the "XR" are Extremely rugged devices!! The amplifiers have very good IMD since the devices are designed to loaf along at the designed power level.
They are not pushed to the limit or to saturation! I was asked a few questions by members so here is my added reply.Amps are made for 160-10 and 6m. Slight trade off to et the right balance in power/bandwidth so there is.
Clamping the devices and not just using 4-40 screws at the tabs Results are. Very good and when ran at 2000w out F2 and F3 were way down and very known. 10-11 MHz distortion of LDMOS (known physical property probably to the way the device is made). See bird power meter picture on 2kw outwith about 4 w drive! Over all a very stable and powerful board.Look at input VSWR curve I have added. All below 1:1.5. A good power supply that can be used with my amps or boards can be found here. Or a nother type that can be used with abit lower amperage here. Please verify your address during checkout.
- Brand: 4z4rb
- Model: 4 x blf188
- MPN: 4 x blf188 board
- Max. Output Power: 3600W
- Frequency Band(s): HF
- Supported Modes: FM
- Country/Region of Manufacture: Israel
- Country of Manufacture: Israel