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UPDATE of Symptoms: NEVER say Never ;-). I have since found that the "bad" unit DOES show a orange DMR LED, but only when an active TG is talking, but obviously only when on wifi and thus the DMR BM server has traffic to send to it. But the mmdvm does not TX DMR correctly (details below). ...

Here are the photos, but unfortunately, the important ADF7021 portion is blocked by the OLED. https://imgur.com/a/M7Lnkjs Purchased on eBay at: https://www.ebay.com/itm/264973895527 First one bought in Nov. 2021 works fine. Second ordered from same vendor does not work. Third from another vendor als...

First off, thanks much for the interest and insights! Exactly what boards? Either find the silkscreen name and board revision number or post a decent photo of the boards or maybe the auction/site where you got them. https://www.ebay.com/itm/264973895527 Photos later Funny thing is I bought one from ...

I have two MMDVM_hs_hat clones that have the same issue and is suspect, suggesting a PCB issue? Symptom: No TX/RX. No orange LED. Use mmdvmcal and CW shows up way off freq, set it fro 433.0 or 446.0 and spec an shows spike at 484.1 MHz I have upgraded mmdvm FW and downgrade multible times with no is...