I'd suggest looking at newer parts for the TX/RX switch, LNA section as
well as considering using parts that reduce the part count. There are a
lot of them on the board and generally parts back and front is really hard
to assemble by hand. Maybe a reduction in part count if you used
minicircits filter modules? Skyworks, Analog and others have low part LNA,
TX/RX sections.
On Mon, Apr 13, 2015 at 10:37 PM, Brady O'Brien <brady.obrien...@gmail.com>
wrote:
> Hi everybody,
>
> I've been helping out with the development of VHF and up FreeDV and the
> minimalist VHF SDR. I've gotten to the point, on the analog side of things,
> that it seems appropriate to get a board made. What I've designed is a VHF
> frontend for further experimentation. It's based heavily on the VHF section
> of the DSP-10 transceiver, a DSP based radio described in the links below.
> Before I buy parts and send the board off for fabrication, I'd like someone
> with a little more radio design experience look over the schematic and maybe
> PCB layout. I'm using Kicad to design this. As this board is just a stepping
> stone, I'm going to keep it out of the Freetel SVN repo, at least for now.
>
>
> Schematic for the front end:
> https://github.com/baobrien/vhf-radio/blob/master/exp-1/exp-1.pdf
> Github repo: https://github.com/baobrien/vhf-radio
>
> DSP-10 Part 1:
> http://www.arrl.org/files/file/Technology/tis/info/pdf/9909033.pdf
> DSP-10 Part 2:
> http://www.arrl.org/files/file/Technology/tis/info/pdf/9910034.pdf
> DSP-10 Part 3:
> http://www.arrl.org/files/file/Technology/tis/info/pdf/9911042.pdf
>
> Thanks,
>
> Brady O'Brien KC9TPA
>
>
>
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