Re: OT2 Solid State Relay and Inaccurate Voltage Report
- Got it
Would it be a mistake to run a parallel power input from the battery to both the solid state relay and the coaxial power connector? I was reluctant to do that in fear of introducing a circuitous path to ground or some other path that I may not be aware of.
Just wanted to ask if that would be an alternative to jumping SJ1.
--- In email@example.com, Scott Miller <scott@...> wrote:
> D11, the reverse bias protection diode on the v2.0 board, can't handle
> the current you might try to pull through the solid state relay, so the
> big input pad bypasses it. The voltage sense line comes off before that
> so it can get an accurate reading without the diode drop. This means
> that when you're powering it from the big pad, nothing goes to the
> voltage sense line.
> The fix for this is to put a blob of solder on solder jumper SJ1 to
> bypass D11. That will get you the voltage reading, but it'll disable
> the reverse bias protection, so be careful when you're powering it
> through some other input.
> On 10/3/2010 10:54 AM, Edward wrote:
> > My open tracker is being powered by a 12V battery connected to the solid
> > state relay input.
> > I was surprised that the battery connected to the solid state relay
> > input powers the OT2, but it does.
> > There is no power to the OT2 through the coaxial power connector or
> > through the DB9 connector.
> > Below is a packet from the OT2:
> > 2010-10-03 10:07:37 PDT:
> > KE7MWY-1>APOT21,N7ZEV-2,WIDE1*,qAR,W7RBV-5:!3600.75N/11505.09W> 00.3V 86F
> > As you can see the voltage is being reported as 0.3V. The battery
> > voltage is actually about 12.52V
> > Why is the voltage being reported 0.3V?