I've been bench testing (ok, kitchen table) my newly constructed ATU-100, kitted by RA0SMS.
I was comparing the measured inductance with that shown on the 1602 LCD by connect my DE-5000 across the RF input and output, whilst in the simple test mode. Although the LCD counts up normally from 0 to 8.53 uH, my DE-5000 shows some significant anomalies.
When increasing inductance step by step, at both 2.20 and 4.50 uH, as shown on the LCD, the inductance falls back to minimum inductance on my DE-5000 LCR meter. It's not until 6.70 uH on the LCD meter that inductance climbs to 8.53 as designed.
I thought perhaps it was a cold solder joint, but I've actually checked the voltages on the relays, and relays are not energizing when appropriate. Logically, because I can read both minimum and maximum required inductances on my DE-5000, one distinct possibility that comes to mind is there is a programming error.
I'm thinking of making a table to indicate the energized state for each relay relative to the inductance shown on the LCD. I have version 3 of the firmware, ATU-100 EXT with 7 inductors. Before I do so, has anyone else noticed this sort of issue?
Tnx in advance de Russ, va3rr
va3rr