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Hi all, Re-posting this as for some reason our first post never made it through:?

We're running into a major issue with a recently assembled RC210 ¡ª it?€?s not responding to valid COS signaals or PTT (besides manually triggering it) on any of the three ports, even though the connected repeaters are confirmed working.

We're interfacing with both a Motorola XPR8300 and a Kenwood TKR-740 ¡ª and here?€?s what we?€?ve conffirmed:

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Repeater Tests (XPR8300 & TKR-740)

• COS (Pin 21 / GPIO3 on XPR8300): Drops from ~4.66V to ~0.53V when receiving a signal (confirmed using XPR Pin 16 as GND).
• PTT (Pin 17 / GPIO1): Keys repeater successfully when pulled low.
• We repeated these tests using a Kenwood TKR-740 repeater with the same result ¡ª valid COOS signals present and working as expected.
• All measurements taken directly at the repeater accessory connectors using a multimeter. RC210 was disconnected for isolation testing.

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RC210 Fails to Detect COS

• All jumpers set per manual (e.g., JP2 = 1¨C2 for Active Low input on Port 1).
• GND is confirmed clean and consistent across DB9 pins 6, 8, and 9.
• Simulating COS by shorting DB9 Pin 7 (COS IN) to Pin 6 (GND) results in:
  • No COS LED
  • No PTT trigger
  • No voltage drop on PTT OUT (Pin 3)
• However, manually shorting DB9 Pin 3 to GND causes the PTT LED to light and voltage to drop to 0V ¡ª confirming the RC210's PTT output circuitry is working corrrectly. ** All three ports, no automatic PTT detection either **
• Same behavior confirmed on Ports 1, 2, and 3 ¡ª no COS detection on any port.

We had this unit assembled by Mr. Ken at Arcom, and he sent it back to us in a timely manner, we also emailed him our findings as well, hopefully he can help us with this.

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Additionally, during troubleshooting the board, we found several clipped component leads left between pads and vias. We removed these and looked over the board for any shorted traces etc. - the bigger concern remains the complete failure of COS input logic.

• Looking for any guidance from other users in the group in the meantime.
• Perhaps any other others of the XPR8300/8400 would also share their experiences and their pinning, we included a snapshot of our CPS Accy settings.

Has anyone else seen this issue before? Could all three COS input stages actually be defective, or are we missing a board-level config step? ¡­ We did successfully connect it to the PC softwaree but did not change any default settings, as it should have worked at least on the ?€?basic default?€? settings without changing anything correct?

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Thanks in advance,Bryan, KB9UZO

Eastern Colorado Repeater Association-ECRA

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