[NSRCA-discussion] Strange problem - time for Dr. NSRCA List

[David Cook]

I think I have seen this with poorly soldered Y harnesses.  Poor contact
with power or signal wire seems to be the culprit.  I have also seen this
with connectors that have not been 'wiggled' in and out to clean the
contacts after sitting too long.  Once cleaned the connectors work fine.  2
¢.

Dave Cook



On Sat, Jul 17, 2021 at 11:26 AM Michael Cohen via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:

> Dear Abbie, during my pre-flight check, I had a strange issue I would like
> to run by the NSRCA list.  For equipment, I have two PLR5W Voltage
> Regulators in my plane feeding a Futaba R7008SB receiver.  I am not using
> SBUS, just classic one servo per port.  Both freshly charged batteries
> check in with 8.3V with a 2A load.  For initial setup check, I always turn
> one switch/regulator on, check the control throws with several cycles, turn
> the second one on, then the first one off, and check control throws again
> with several cycles.  Today, with that second one on only, the ailerons or
> rudder would either freeze for a second or oscillate on their own for a
> cycle or two intermittently.   I check each one independently and together
> several times and when the first one was on by itself or both were on
> together, the problem did not occur.   That second one, even when swapping
> batteries, had the same issue.  Needless to day, I shut down, disassembled,
> and headed home for some more testing.
>
>
>
> At home, I swapped the port in the receiver and that second regulator was
> using to the one the first one was plugged into and had no issues.  So,
> maybe the receiver has an issue????  So, I switched it back, and behold, no
> issues!!!!!  WHAT????  I did a lot of testing swapping ports and batteries
> and no combination of single power to the receiver causes the problem to
> repeat.   Any ideas?
>
>
>
> Regards,
>
> Mike C
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
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