I suspect the matching network is tuned for UHF...
On Wed, Jan 18, 2023 at 9:30 PM Burns Fisher (AMSAT) via pacsat-dev < pacsat-dev@amsat.org> wrote:
Leaving it will allow a fallback half duplex configuration
On Thu, Jan 19, 2023 at 3:29 PM Rich Gopstein via pacsat-dev < pacsat-dev@amsat.org> wrote:
BTW - the external 90nH inductor isn't needed for the UHF chip. No harm in leaving it in, though.
On Wed, Jan 18, 2023 at 4:07 PM Jim McCullers via pacsat-dev < pacsat-dev@amsat.org> wrote:
Attached are the schematic and layout for the TMS-570 LaunchPad booster board.
It contains two AX5043 circuits configurable for VHF or UHF and places for four MRAMs.
Not all positions are required to be present so the build can be by need.
It does contain the resistors I discussed that may not be required in future versions.
Please give it a review as I’m preparing to send the design to the PCB board maker for a first trial run.
73
Jim McCullers
WA4CWI
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-- 73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
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