Had same issue, low power to ATMega\LCD (poor contrast adjustment, random microprocessor resets).
Cause turned out to be residue on the leads of L6, despite the solder joint looking good it exhibited resistance.
This case fits with Hans findings of no issues with 100uH, at a guess
the residue is a by-product of the manufacturing process and therefore variable.
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On 17/10/17 17:47, John PD7MAA wrote:
PA0EJH gave me a tip.
The 100uH inductors in the kit are verry small thus having some resistance By simply mounting larger types with lower resistance the problem was solved on my QCX.
73 John PD7MAA
