This is a new version of external TS-480 RX port for SAT and HX models. It is intended eg for ext SDR waterfall use.
This external RX port is not affecting transceiver sensitivity, it takes a sample of antenna signal with high input impedance.
SMA female connector installed in the rear panel
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Example of a SRD waterfall display in HDSDR software
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 The add-on board
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  Small 12 x 17mm PCB
Parts assembled
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 Open the top cover and remove the RF shield, 12 screws
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 Locate the metal relay cover marked green in this picture. SAT
model shown.
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 Fix the PCB on the relay cover with contact
adhesive and make the wirings
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 Green RF input, tinned wire GND, red +13.8V, grey coax out for
SMA connector.
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 TS-480 SAT schematics |
 TS-480 SAT connection points
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 TS-480 HX schematics |
 TS-480 HX connection points
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Update 2025-05-10
This circuit is prone to oscillation in GHz range. |
This is stable. On PCB replace C1 with 220R resitor and add capacitor C1 in series with the input wire. |
Downloads - Schematics Ver C2 (Stable) - Schematics Ver C (Prone to oscillation) - Layout Ver C - BOM Ver C2 - Gerber files Ver C (Note PCB thickness 0.8mm) Update 2025-05-10 OH7SV (Modification to prevent oscillation) Back to OH7SV projects |