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Noticed a high-pitch sound from a TRH fan. Chris determined it was the 16m TRH. The propeller had come off the shaft, and was not repairable. Swapped the 16m and 2m TRHs, so that currently the 2m TRH does not have fan ventilationit will be easy for someone to replace the low unit.
Therefore the TRH at 16m has not had fan ventilation for an unknown period of time up to Feb 2, and likewise for the 2m TRH after Feb 2, until it is replaced.
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