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NXP 1550 Watt MRF1K50H-TF2 27MHz Amplifier

Discussion in 'Amplifiers' started by BBB, Apr 26, 2017.

  1. BBB

    BBB Well-Known Member

    Jan 17, 2012
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    Saw this NXP brand 1550 watt MRF1K50H-TF2 50V 27MHz "amplifier evaluation board" for sale for $1200. It can probably use the newest NXP 1800 watt 65V LDMOS as well. I've yet to find a schematic for it.

    Was wondering since these are typically designed for use in thermal welders how wide is the bandwidth? Are these typically so narrow banded they are for use on only one 27 MHz frequency? Maybe just they way they are tuned when set up?

    Can anyone get the 27MHz reference circuit info for this board?



    #1 BBB, Apr 26, 2017
    Last edited: Apr 26, 2017
    Crusher likes this.

  2. rockyroad217

    rockyroad217 Member

    Aug 14, 2014
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    I'd like to bump this post since I have the same question
  3. nomadradio

    nomadradio Analog Retentive

    Apr 3, 2005
    Likes Received:
    The 27 MHz frequency spec is for the "ISM", or Industrial, Scientific and Medical frequency at 27.120 MHz.

    It will need a low-pass filter on the output at the least. A look at the gain shows nearly 30 db at 1200 Watts output. That would be around 1 Watt of drive.

    This is why you will see a big attenuator in the input side of commercial amplifiers using this kind of transistor. To drive it with 20 Watts PEP would call for a 50-ohm dummy load that taps off one-twentieth of the drive power to feed the transistor.

    More or less.

    And you'll need a big heat sink. The copper spreader serves only to increase contact surface against the aluminum. It won't absorb as many Watts per inch as this transistor will dump. The copper WILL soak up that much heat through a small surface, and deliver it to the aluminum surface of the heat sink.

    Could probably liquid-cool it. If only those gaming-computer water-cool toys had a Watt rating listed on them. Still haven't found that spec listed for any of those I have looked at.

    You would think somebody could beat their price on the circuit boards.

    Shadetree Mechanic likes this.
  4. n8fgb

    n8fgb Well-Known Member

    May 18, 2008
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