David-
I had an identical problem a few years ago. I had blown the final in my tra
nsmitter. The final transistor is relatively powerful and what permits you
to transmit some distance. I was getting about 2 milliwatts output from the
driver and could be heard for about 3 miles. Replacing the final transisto
r was the fix. If you can beg, borrow, or steal one, a wattmeter with a dum
my load will tell you if that is the case. Simpler than all the testing, if
you can get to the back of the transmitter, put an SWR bridge in the line.
If it is an antenna problem, the SWR will be quite high, probably over 2/1
. If you know someone who is a radio amateur they may be able to help you w
ith both tests. They are very simple and can be done in five minutes or so.
Failing that, I'd construct a tape dipole as described in the manual and h
ang it outside the plane. If you can both transmit and receive off it, the
antenna in the airplane is your problem. The tape dipole aft of the baggage
compartment will work just fine if you need to replace the antenna.
Jim Puglise, Punta Gorda, FL
----- Original Message -----
From: "David Lewendon" <davidlewendon@me.com>
Sent: Saturday, May 28, 2011 3:54:59 AM
Subject: Europa-List: Filser Radio problems
I have a Filser ATR 600 VHF Com plus a separate Filser Mode S
Transponder. I am experiencing difficulties in transmitting and
although I can hear various ATC centers from a reasonable distance of
20 to 30 miles out I cannot get them to hear me until I am only 6 or 7
miles away.
My Europa does not have an external antenna and having looked in the
rear fuselage section there appear to be two coax type cables. One
goes to a black metal box approximately 4 inches long and 3/4 of an
inch square that is fixed to the upper side of the fuselage (about the
ten o clock position). The other cable disappears into the tail section.
There is a small unpainted metal antenna about 2 inches long
protruding from the lower fuselage but this must be too short for a
VHF radio and does not have the small ball on the end like a
transponder aerial would have.
BTW, I have not checked the transmit button yet for a good connection.
Any clues pleas?
Thanks
David
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