4 x BLF188XR LDMOS BOARD 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. About 20% drop on 6.
As for duty cycle If the boards are mounted as needed on. A proper heat sink with a good sized copper heat spreader with 10mm thickness. And air is directed on fins as well on top of board to cool the magnetics I. Was able to run the amps for a long time. Cores are large and many thus an.
Average rise of core temperature is also controlled As a result I have not. Seen core failure or saturation and far away from curie point.
Of many cores gives better IMD and far better results than using A single. Very large tube or core Also as seen in ON9CVD study on Magnetics. Tested the 3 ++kw board with 4x BLF188XRS on a full copper heat sink with. 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. Please verify your address during checkout. We are not responsible for any wrong or undeliverable addresses.
Items will be checked carefully before sent out. Thank you and 73's. This Amp is intended for use by suitably Licensed Amateur Radio Operators Only. And is not intended for CB or any other radio services where regulations prohibit its use. The item "4 x BLF188XR LDMOS BOARD AMPLIFIER VERY HIGH POWER" is in sale since Wednesday, March 07, 2018.
This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". The seller is "4z4rb" and is located in Israel. This item can be shipped worldwide.