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Old Nov 16, 2011, 06:27 AM
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Al Ducharme
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Orlando, FL
Joined Jan 2005
735 Posts
Couple things. The USB is 5V but it bypasses the 5V regulator on the HFP. The Power needs to be ~6V-16V. The gain of 25 in the manual is a "Suggested" starting point. You may need more gain.

Are you using a HFGPS with the HFP that won't respond?
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