Blog Archives


AT-D868UV Questions and Silver Lining


These are VHF and UHF (respectively) captures from the AT-D868UV dual band DMR handheld. This indicates timeslot violations during the first ~100ms of a DMR transmission, which quickly settles down to normal behavior. Other than this timeslot violation the RF is clean, looking about as good as offerings from Connect Systems and Tytera.

Baofeng DM-5R and Radioddity GD-55 test results


(Updated Apr 3 2017 to include the Radioddity GD-55.) Rocky Mountain Ham Radio continues to investigate alarming problems with recently released low-cost DMR Tier II radios. This article focuses on the Baofeng DM-5R Plus, Baofeng DM-5R with Tier II firmware update, and the Radioddity GD-55  (a rebranded Tytera MD-398). Our tests find that the Baofeng DM-5R Plus and Radioddity […]