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Thread: Just some silly links

  1. #1

    Just some silly links

    Again, either of the MRF101 or MRF300 boards I'm developing will need it's own LPF.


    https://www.tindie.com/products/ra0s...mini-by-n7ddc/



    https://qrpblog.com/product/f600-160...ss-filter-kit/


    https://www.ebay.com/itm/12v-100W-3-...wAAOSw3HxakWbu


    adapt an oldie but goodie

    https://www.ebay.com/itm/Icom-IC-751...ss!98146!US!-1


    for the receive side


    https://www.ebay.com/itm/NEW-Multi-B...0AAOSwzWFd9l5~


    https://www.ebay.com/itm/HF-BPF-band...sAAOSwsYpaIB2z


    https://www.ebay.com/itm/BPF-band-pa...cAAOSwgHJZyjz7


    and just because


    https://www.ebay.com/itm/Kit-of-2-PC...F/324023532689


    https://www.ebay.com/itm/PCB-for-HF-...IAAOSwnqldf0yK




    then there is the ...

    I've dealt with this "family of sellers" several times on lesser items with good results.


    https://www.ebay.com/itm/HF-power-am...UAAOSwLYhc57KK


    would need of course the usual control and protection circuits from the same sellers or https://www.w6pql.com/parts_i_can_provide.htm


    Again, either of the MRF101 or MRF300 boards I'm developing will need it's own LPF.

    https://www.tindie.com/products/ra0s...mini-by-n7ddc/

    https://qrpblog.com/product/f600-160...ss-filter-kit/

    https://www.ebay.com/itm/12v-100W-3...644407&hash=item1ca27bbd4e:g:3DwAAOSw3HxakWbu

    adapt an oldie but goodie
    https://www.ebay.com/itm/Icom-IC-75...VsAAOSw7thcBJUd:sc:USPSFirstClass!98146!US!-1

    for the receive side

    https://www.ebay.com/itm/NEW-Multi-...603802?hash=item288b1cab9a:g:j70AAOSwzWFd9l5~

    https://www.ebay.com/itm/HF-BPF-ban...659425?hash=item4d51312e61:g:qNsAAOSwsYpaIB2 z

    https://www.ebay.com/itm/BPF-band-p...322734?hash=item236a8a966e:g:0RcAAOSwgHJZyjz7

    and just because

    https://www.ebay.com/itm/Kit-of-2-P...on-NXP-LDMOS-transistors-for-LPF/324023532689

    https://www.ebay.com/itm/PCB-for-HF...791208?hash=item288481cde8:g:IPIAAOSwnqldf0yK


    then there is the ...
    I've dealt with this "family of sellers" several times on lesser items with good results.

    https://www.ebay.com/itm/HF-power-a...907120?hash=item3b31ffa1b0:g:exUAAOSwLYhc57KK


    would need of course the usual control and protection circuits from the same sellers or https://www.w6pql.com/parts_i_can_provide.htm

    IMG_0011.jpgfinished_bias.jpgdual.jpg

  2. #2
    Volcano Tamer N1LAF's Avatar
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    Nice links and information.

    Is that your board, are you milling out the traces? I have not dealt with too much low frequency signals (< 30 MHz), but some of the questions I might have is in regards to trace impedance, and all border copper adding capacitance to the antenna line trace(s). From a quick look at some of the commercial boards, I noted that there is not much copper near the antenna signal line, and transmission line impedance is not a factor on the PCB, and will be tuned out. I could be wrong on this.

    In my world, I deal more with differential pairs, and LVPECL interfaces. On my boards, differential pairs will maintain a transmission line impedance of 100 ohms (50 for LVPECL), and that the trace lengths are the same to one trace width. These are important especially at 100 MHz and up. Trace impedance control and consideration is always important on clock signals. I have seen ringing on lower frequency clock lines that will cause the attached phase lock loop output be at the wrong frequency - just because of impedance mismatch ringing.

    If you look at the ATU-100 PCB, all the coils are in the center, and no ground copper nearby. Capacitors on one side, because the one side of the caps are at ground, which is probably running on the bottom side under the caps.

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