49 thoughts on “Blog”

  1. Hello, is there a finished and marketed product? Mod. both bands has 1.8 / 54 mhz and Vhf 142/148 mhz.
    Thanks for info and price.
    73 greetings

    1. Hi , I am not selling an amplifier (Only some parts). Case and Firmaware available immediately, the remaining modules are made to order the lead time is 2 months. For a complete assembly you must buy some parts available on Ebay AliExpress, Ebay. The firmware and the casing can be adapted to the modules of W6PQL.COM and EB104

      1. Ronald Ziegler

        I am very intrigued with the comments I have read on eham.com. Could you send me more information. Do you have assembly instructions, total price for parts? Thank you Ron W1RZ.

    1. Norm Mccollough

      Hi. Can you send a price list for the parts and lead times. Heard this amp discussed on 80m and seems to have gotten glowing remarks. Best wishes.

  2. Eduardo LALO Giordano

    hola Kenny
    cuando crees que estarán disponibles los kit completos ?
    realmente me parece un excelente producto y quiero comprar uno armado o un kit completo para armar la nueva version III
    te felicito un lineal muy bien diseñado y actual y lo mas importante todos los compradores están satisfechos ….


    1. Hola Eduardo, mi trabajo principal me toma toda la semana, e dedicado el fin de semana y los tiempos libres para emprender este proyecto . Tardare 2 meces en tener una de estas piezas listas

  3. For all readers, i am one of the many happy and satisfied customers using a Mercury III for a year now.
    I use it every day at full power of 1200W driven by an IC7610 with just 40W output and the IM products at that level is always -37 db.
    Reports received are that my TX is very narrow with no splatters at all.
    It works warm at long periods of TX. Never hot
    Fan is very quite and automatic band switching is very fast with just one PTT press.
    I have owned in the past the Expert 1.3K and also the PalStar 1K and by far this kit works much better besides that it look nicer

  4. buenas tardes estoy interesado en el amplificar me gustaria si pudiera tener una llamada con tigo por favor 9195249030 gracias

    1. Hi Virgilio, I am not selling an amplifier (Only some parts). Case and Firmaware available immediately, the remaining modules are made to order the lead time is 2 months. For a complete assembly you must buy some parts available on Ebay AliExpress, Ebay. The firmware and the casing can be adapted to the modules of W6PQL.COM and EB104

    1. Hi, the Case is compatible with Power Supply of communication servers, you can use ETP-48100 server (53 Volt, 57 amps)

  5. Your (built controller board) shows out of stock, is it possible to purchase the built controller board? Of course I plan to purchase all the other PCB’s but would like a complete controller board.
    Thank You


  6. Hi

    I understand that you do not sell a complete kit. Is there a reference or article/website that would help me understand what I need to order and do in order to construct a functional unit? I have built a K2/100 but would need some guidance on the approach and details of assembling such a unit as well as modifying the software.


  7. I seriously love your blog.. Excellent colors & theme.
    Did you create this site yourself? Please reply back as I’m
    trying to create my own personal website and would like to find
    out where you got this from or exactly what the theme is

    Keep up the good work!

    1. Hi Emanuel, I myself have created everything, if you need help I can share links and videos with you about it, thanks

  8. Hello Kenny. Nice Amp kit design. Have been following this for a while. Would appreciate it if you could send me info on the loaded / tested boards you supply as well as info on what other items I need. Are you using the W6PQL RF deck that uses the NXP BLF188XR? I watched the video of Carlos in Costa Rica. He commented the amp is SWR sensitive? I thought the NXP transistor was massively swr insensitive? Is there any issue using this amp with an auto tuner like the MFJ998? I have a SB200 that I did a Utube rebuild vid on about ten years ago. Works great but your amp kit integration looks awesome. TNX & Rgds, RG

    1. Hi Ralph, good question! I currently use the LDMOS MRF1K50H device. Yes, the LDMOS devices are very robust, they survive very high SWRs, but other components are not designed for this. The capacitors can explode and the toroidal cores will heat up to lose their native properties. Previously, the controller was configured to stop the amplifier when SWR> 2.0, that is, at 1200 watts there is a reflected power of 133 watts. Now change the protection concept for Mismatch antenna,now the controller constantly evaluates the reflected power, if it is> 125 watts REF Power the amplifier stops quickly. Therefore you can work antennas with SWR> 2.0 and work less power. Remember, if the antenna is in bad condition the SWR trips for a few milliseconds and will activate the protection, this can happen in any solid state amplifier with protections. Yes, you can use a tuner, but I recommend you; If you have antennas with SWR> 1.5 try to start with the antenna and then the amplifier, believe me you will have better results))). Thanks for being here .

      1. Thanks Kenny, Makes complete sense. I have my antenna pretty well tuned and plotted. Both are impressive devices. I spent 25 yrs in the semi biz. The NXP MRF 1K50H is also a beast of a part. NXP has committed to a minimum availability of 15 years for the device.That is a life time in the semi biz. I am interested in building one of these so please email me what you can. TNX RG

        1. Kenny, I am in no rush. Have been contemplating a solid state amp for years. What’s a few more months. Your design is awesome.
          Sounds like you need a pick and place machine, an IR reflow oven and 48 hour days.
          Please put me in the cue for a set of boards when you are going to start the next build.
          Let me know. Thanks for your effort.
          Rgds, RG

  9. Norm McCollough

    Hi Kenny
    Finished the amp parts assembly and had it on the air at 300w due to my tuner. I just got my 1.5kw antenna tuner and am running the LDMOS amp Now at 1kw. Many have commented on the high quality of the AMPLIFIER performance and sound on air. Lots have asked how difficult to build/assemble the parts. I tell them it is not that difficult and that I used very fine silver solder for connections. Worked very well. I really like this amp. 73s
    Best Regards

    1. Hi Paul, we don’t have PIN diode .We have the G2RL-1-E relay, which is operate (set) time Approx 7 ms,
      release (reset) time Approx 2 ms

  10. Awesome amplifier….my project is complete, finished and on the air. Nothing but good reports, so clean some don’t believe I’m running an amp. If your thinking about it get yourself on the list and pull the trigger, you wont regret it.

  11. Looking at the Power Amp PCB, I see the LDMOS device with its gates and drains soldered to the PCB tabs.
    But, what I do not see are any machine screws holding the LDMOS device in place.
    Its obviously soldered to the copper heat sink ?
    If so, what is your procedure for replacing the device when there’s a failure?

    1. Good question Tom. LDMOS devices generate very high temperatures in a very small area, much more than the classic Mosfet and Bipolar Transients. Any thermal paste will end up expiring and isolating with continuous work (But this is very convenient for commercial manufacturers, after warranty expires). Direct welding to the spreader reduced the probability of breakage for temperature. To replace the LDMOS is easier than it seems; Cut the Gate and Drain wings soldered to PCB – heat the copper plate to 180-200 G Celsius. As is the initial welding process.
      Note is low probability of replacement due to breakage in the future unlike conventional designs. The 17 dB input attenuator and LDMOS characteristics VSWR mismatch> 65: 1; reduced the probability of breakage compared to classic designs.

      1. Ken, I’m impressed with the alignment process as described by friends who have built the amp, almost nothing for the builder to adjust, sort of a plug & play.
        The 17dB pad is also a life saver as it would allow 100W input with only 1.5W getting to the LDMOS input, which is its max input.

        The unsoldering process you describe is straight forward as you state. Cut the wings of the failed device and using a hot plate or other device to heat the copper heat sink to temperature and remove the LDMOS.
        However, is it possible to, after the wings are removed, to unbolt the PCB and remove it so the SMD components aren’t subject to the heat transfer from the Cu plate thru the PCB Material?

        I know what the spec for the LDMOS devices states, but in the Mfr testing they are using a very narrow pulse of high rep rate to withstand the 65:1 VSWR.
        If this were true in the RF world we are using, SSB, CW, Data, etc., why would a tuner be required to match the output impedance?
        And, you wouldn’t be designing a Tuner for a companion unit.

        Thank you Ken for your quick and prompt reply.

        Tom W3FRG

        1. By the way, which manufacturer of the module you replaced LDMOS? If it is true, we have protections for reflected power> 125 watts approximately SWR 2.0 – 1Kw. Although it is true that LDMOS supports such mitsmach, the rest of the components: ferrite material and capacitors can be damaged, I think that it is not a good practice to have a detuned antenna, I like <1.5. The LDMOS specifications are good for KM3KM controller of a 2.7 millisecond disconnect time. The LDMOS is still alive after transmitting 1KW with the antenna disconnected or an incorrect filter segment attenuating all power. Watch videos; a disconnected antenna test and a filter segment attenuating all energy. Note; When I took this video the disconnection time was 24 milliseconds, after an intense work together with RZ1ZR the code was optimized, reducing the time to 2.7 milliseconds. In the future I will publish the oscilloscope measurement times screenshots. Do not try this with classic solid state amps or older vacuum tube amps !!. All testing with genuine devices, never use fake LDMOS.


  12. Ken, tnx for the prompt reply.
    I have replace Ampleon BLF 188 & BLF 189 LDMOS devices.
    Ok on your inputs regarding power handling.

    73 Tom W3FRG

    1. Tom, watch the video .Note that the temperature of SMD components on PCB did not exceed 140 ° C. SMD soldering temperature is higher.
      The temperature is constantly monitored with an infrared camera at different points including the LDMOS device.


  13. Kenny,

    Very good demo of heating the pallet for soldering the LDMOS and temperature distribution on PCB of SMD components during process.
    Thanks Tom W3FRG

  14. Ken,
    I do not see any pictures of the RF Pallet mounted on a heat sink other than the Cu spreader.
    The pcb is attached to the copper spreader, that the LDMOS is soldered to, but I see no attachment screws.
    How is it attached?
    Also, could you provide some pictures of this assembly mounted to the heat sink, if available?

    Tnx Tom W3FRG

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