Hi Jeff, hows it going? Yes I agree the ground is the most likely place
it's getting in but I'v run a second ground to the radio rack the
engine monitor the trim and still can't get rid of it. I'll try the
ferrite beads next. I too ran all my coax down the opposite side
keeping them away from the others wires. I'll be taking the panel to
Ron Dupler at the local avionics shop and letting him have a stab at it
as myself and two other local plastic plane builders are all stumped.
Looks like Paul McCallister is having the same problem.
I probably wont have the hours flown off by Sun & Fun but I still may
be there. I have a friend that lives not far from Lakeland thats
expecting me. I'll let you know or call your cell then.
Thanks, and we'll let you know of the first flight.
Jeff
A258
On Feb 13, 2006, at 12:06 PM, Jeff B wrote:
>
> Jeff,
>
> I'm using the same setup Icom/Archer. My coax runs through a 1" x 2"
> channel in the left of the fuse, along with the transponder coax, left
> wing wiring and a couple of other power wires. You've ridden in the
> bird and, as you probably know, there is no interference, at all. The
> only time I had a probelm, was with the mic going to open and affecting
> the trim, tripping the breaker. That turned out to be a short in
> intercom wiring. Once it was fixed, the problem went away. I'd check
> all other connections, including grounds, just to be sure they are all
> good. Other than that, I'm stumpped, but that's not hard to do... :)
>
> I know you're close to first flight. Keep us apprised. Hope to see
> you
> at Sun-N-Fun...
>
> Jeff - N55XS
> 141 hours
>
> JEFF ROBERTS wrote:
>
>>
>> HI All,
>> I remember this was discussed before, but to know resolution as I
>> recall. I Have been fighting an RF problem with my I-Com radio. The RF
>> is obviously getting into the ground as even the trim LED's are
>> effected. I have a Stratomaster engine monitor from MGL that seams to
>> work great until I hit the push to talk button. It then goes black and
>> the trim and Navaid LED's go crazy as well. I have a Bob Archer
>> antenna
>> in the tail and the radio sounds clear and transmits well. When tested
>> with any other antenna the same thing occurs. The power to the antenna
>> is about 7 watts and there was only about a half a watt or less coming
>> back on the shield when tested. I made sure some time ago that the
>> com
>> RG cable to the antenna was isolated from any other cables. We have
>> checked, and all grounds are good on the radio. I have been told to
>> install some ferrite RF suppressors on the ground and output of the
>> transmitter and to place them on the ground and power going into the
>> engine monitor. Before I order these have others run into this and
>> have
>> you determined the cause and solution? Any Ideas are very welcome as I
>> have been scratching my head for a week!
>>
>> Thanks in advance,
>> Jeff Roberts
>> A258 - N128LJ
>> Waiting inspection 1st week in March.
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