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NXP

Discussion in 'Home Brew' started by kopcicle, Jun 18, 2019.

  1. kopcicle

    kopcicle Sr. Member

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  2. kopcicle

    kopcicle Sr. Member

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    27 MHz
     

    Attached Files:

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  3. kopcicle

    kopcicle Sr. Member

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    https://www.digikey.com/short/phhnnv

    This list comes with an anecdote. Edgar the loud (cat) key-walked an order for 250,000 or so , wiped out the list twice while I was AFK , and placed gibberish in the comment box. Digi fortunately called the next day asking "wtf?" ...
    If you've ever made up one of these lists from a BOM you know the time invested. In any case you're welcome. I'm regularly calling Edgar "Stir fry" . He seems to get my frustration and avoids me and the keyboard.

    https://www.coilcraft.com/pa/order.cfm?ID=17541078
    https://www.coilcraft.com/reqsamp.cfm
     
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  4. nomadradio

    nomadradio Analog Retentive

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    Umm, I hope you kept a record of that.

    I seem to have "done an Edgar" with that list.

    It showed "not a valid stock number" in one column for every part on the list when I looked at it.

    Seemed odd.

    Clicked a button that says "clear all errors".

    Should have been labeled "cause all errors".

    List came back with only one item after that.

    Looked for an "undo" button.

    No such luck.

    Scheisse!

    73
     
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  5. kopcicle

    kopcicle Sr. Member

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  6. kopcicle

    kopcicle Sr. Member

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    It's read only on your end , no damage done
     
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  7. nomadradio

    nomadradio Analog Retentive

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    Way cool! That's a relief.

    Thanks for putting it up.

    73
     
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  8. kopcicle

    kopcicle Sr. Member

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    Edgar however has not yet come out of hiding
     
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  9. kopcicle

    kopcicle Sr. Member

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    items in Order: 13

    Subtotal: $26.96

    Shipping: $8.99

    Tariff: $0.89

    Sales Tax $3.72

    Total: $40.56

    this was for two MRF101-START
     
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  10. kopcicle

    kopcicle Sr. Member

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  11. kopcicle

    kopcicle Sr. Member

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  12. kopcicle

    kopcicle Sr. Member

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    partz.jpeg
     
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  13. kopcicle

    kopcicle Sr. Member

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    inverter_scale.jpeg amp_scale.jpeg
     
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  14. kopcicle

    kopcicle Sr. Member

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    Past time for an update...
    first off is the nagging little detail of getting from the amp to the antenna.
    I'll start here .
    2019-09-12T14 05 48.547Z-2.jpg
    Automatic Antenna Tuner 7x7 ATU-100 mini by N7DDC
    https://www.tindie.com/products/ra0sms/automatic-antenna-tuner-7x7-atu-100-mini-by-n7ddc/
    Just one of the many places to obtain one. Just a very useful tool to couple 100w to an antenna.
    Remember these links?
    https://www.w8ji.com/windom_off_center_fed.htm
    https://sites.google.com/view/kn9b/guanella-current-balun

    Okay , moving right along. A "tuner" is not a low pass filter. It can be to a certain extent if a Pi-L design but that is for the advanced course or for those that want to look up the Drake MN2700B schematic and or manual (available on request)

    So for any broad band (absolutely) and (most) single ended (even monoband) sand state devices a low pass filter is necessary. The harmonics pouring off these devices is significant. So now we're on to switchable low pass filter networks.
    First 100w
    100wLPF.jpg
    https://www.ebay.com/itm/12v-100W-3...644407&hash=item3b33c818ed:g:MMUAAOSwJSJXGEeT
    If it's out of stock many sell the same thing.

    Then on to 600w

    F600-main1.jpg F600-v1.0-schematic.png
    Appropriate thanks to Razvan M0HZH
    WD24 6DQ Watford
    England, Hertfordshire
    https://qrpblog.com/2019/12/f600-600w-low-pass-filter-board-for-hf-vhf/

    I'll cite Razvan's work as an alternative to re purposing a 100w LPF from an HF radio
    751.jpg IC-751 in this case.
    Razvan's work also fills that all important niche between 100w and 1.5K .
    Speaking of 1.5K
    1.2kwLPF.jpg

    https://www.ebay.com/itm/Low-pass-f...747044?hash=item3b0d368424:g:UdAAAOSwfLJa-uZh
    Or
    1.5KwLPF.jpg
    https://www.ebay.com/itm/LPF-low-pa...999617?hash=item1eccdc2a01:g:3OUAAOSw4DJYib3R

    Now on to the amplifiers

    A600-2.0-heatsink-1024x650.jpg
    Again, Razvan's work and can be found on the same site as the LPF
    Why else would you need a 600w LPF ? A 600w amp is a good enough reason.
    Note that the output combiner/transformer does not carry any DC current. Current to the Drains is supplied by a common mode choke.
    https://qrpblog.com/2019/12/a600-v2-0-amplifier-module-changes-and-improvements/

    So Razvan has produced an amazing design. How does that apply to us or more to the point ME as this is my thread and as a consequence I can do whatever I wish with it ...
     
  15. Klondike Mike

    Klondike Mike Sr. Member

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    What do you have for sources of big block heat-sinks?
     
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