HF Amp kit?

Discussion in 'Homebrew and Kit Projects' started by WA6MHZ, Apr 26, 2012.

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  1. WA6MHZ

    WA6MHZ Premium Subscriber

    I am looking for an affordable HF amp kit. About 100W with 5W drive from my FT-817.
    I checked out the HF Packer amp, but it is $265 and only 50W. Need 80-10, but it would be nice to have 6 too. No chickenband amps! Searching the web turned up no clues. Anyone make such a thing?
     
  2. WB2WIK

    WB2WIK Premium Subscriber

    EB-63 from CCI would do this. 4W in = 140W out; very linear at that power level, low IMD.

    It doesn't come with LPFs, you can add as needed. For 20m through 10m a simple 32 MHz LPF will cover it, as only the third harmonic needs further suppression. For 40/80m, you'd need two more filters. They sell them also (everything in kit form).

    About $125 for all the parts including PCB, transistors, etc. but not including a chassis, connectors, fuseholder or heatsink.

    Requires 13.8Vdc at 20A for full power.

    http://www.communication-concepts.com/new_page_9.htm

    If you want to see how mine came out (I built a couple of these back in the late 80s -- they still work fine), I show it inside and out about 20 mins into this video: http://twit.tv/show/ham-nation/43
     
  3. W9GB

    W9GB Ham Member

    Finnish amateurs Juha Niinikoski OH2NLT and Matti Hohtola OH7SV developed JUMA® kits
    JUMA PA100 linear amplifier, with a choice of analog or digital front panel.
    The design uses a pair of Toshiba 2SC2879 RF transistors.
    http://www.nikkemedia.fi/juma-pa100/index.html

    The US Dollar to Euro exchange rate --- explains why you do not see many of these units in USA.

    Helge Granberg, K7ES/OH2ZE (sk, 1996) was Finnish, and often referred to as the Art Collins of Finland.

    JUMA® is a registered trademark of Juha Niinikoski and Matti Hohtola.
     
    Last edited: Apr 28, 2012
  4. AD6KA

    AD6KA Ham Member

    If you order an EB-63 you will not receive the parts (or PC Board) listed
    and in the photos on that web page. They are now shipping
    the EB63A

    This link to the EB63A "Construction Hints" includes
    photos, schematic, and layout...nothing really major
    except that if you order what you see on the CCI EB63
    page, you will be geting a small plastic PC board DPDT relay for T/R,
    not the much larger open frame relay as shown.
    http://www.ae5x.com/docs/EB63_Construction_Hints.pdf

    Also some of the traces on the new board seem a little narrow
    for an amp that draws 22A on peaks, as compared to the
    "original" board.
     
  5. K9FV

    K9FV Ham Member

    Steve, thanks for the link to HamNation - just watched it and you do a GREAT presentation. After all these years of reading your posts, it's good to actually "see" you.

    73 de Ken H>
     
  6. W7ARS

    W7ARS Ham Member

    I see a broad band HF amp kit for sale on eBay, no reference to needing a HAM license... this might fit your purpose, BUT are these kits legal and legit to sell?
     
  7. W9GB

    W9GB Ham Member

    eBay re-seller: grumpyshop in San Antonio, TX and the former Maco owners in Memphis, TN have been moving a number of old CB amplifier parts.
    The specific kit referenced is INCOMPLETE and requires fabrication skills (History Channel: American Restoration level.). I would NOT recommend these for non-technical amateurs (which is a common trait for new amateurs in past 10 years) ... This kit does NOT have the required low-pass filtering.
     
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