Hi Frans
"I have the coax cable run through torroids near the
antenna, and near the rear bulkhead I have some of the cable tightly
coiled up (ten turns) on a lightweight 5cm plastic tube. This to block
any RF travelling on the outer part of the coax. This blocks radiation
inside the airplane, and also reduces sensitivity for noise generated
inside the airplane. I think decoupling near the antenna is not enough,
as the coax will pick up RF again just behind the torroids because of
its close distance to the antenna. Hence the additional coil near the
rear bulkhead."
If you don't mind I have a few questions:
*I have a Bob Archer big "E" model SA-006 in the vertical fin for Becker
transceiver,
will adding torroids decrease performance of this antenna? Will adding
10 turns to this antenna decrease it's performance?
*Same question as prior but using Advanced Aircraft Electronics Dipole antenna?
(someone said it is a folded dipole??)
*I understand you did 10 turns at rear bulkhead to deal with strobe RF near that
location. The antagonist on my install is the DC power wires of two Kuntzleman
power supplies mounted at the wingtips. I have an aft mounted battery, and
will have strobe power supply wires meeting up with battery cables just about
at the passenger headrest. The positive battery cable will run on the starboard
seam of fuse. I want to run my two radio antenna cables along side my fat wire
#4 aluminium positive battery cable forward. In my case would it be preferable
to do 10 turns and torroids after antenna cable parts company paralleling
battery wire (near radio)?
Thx.
Ron Parigoris
BTW 100n capacitor/s helped alittle for noise in radio and a little for largest
spike looking on scope. The torroid helped a little with noise in radio and a
lot with lower frequency noise looking at scope. I need to order some more
torroides
as I think what I had on hand was a little too big.
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