[Elecraft] W1 Power Meter Checkout

[Brian Heinitz]

I completed assembly of the W1 and proceeded with the Checkout and Calibration. 

1. Power-up was normal, with the Forward Power LEDs, SWR LEDs, and Range LEDs properly flashing momentarily in sequence, then the 1.4 Range LED remains illuminated.

2. The calibration was normal. With power on the system, I adjusted the CAL potentiometer for 4.5 VDC between the ground test point and TP1.

The only aspect of the checkout and calibration which was not normal was the resistance test across the battery holder terminal. With the power switch ON and no battery or DC power connected to the unit, the resistance should be > 1 megohm. With my DMM on 2M ohms selection, I receive a reading of 0.651, which is < 1 megohm.

I confirmed the orientation, location and values of all components, confirmed the quality of solder joints, and verified that there are no bridges. Unless I missed something, the assembly is correct.

Any thoughts on the resistance reading? Can I proceed with using the W1 or will this affect the accuracy of its operation?

Thanks!

Brian Heinitz
KI7LKB
N171BH at GMAIL.COM