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Message
Hi Lancair fellows -
here another problem from the land of the midnight sun.
I have the one
and only Lancair IV in Sweden. In my radiopanel there is a King KX155 and a Garmin 423. The
problem is that I have a good transmitting on ground but not in the air.
From beginning the antennas were placed in
the fin and in the aircraft body behind the baggage compartment. The
antennas were placed according
to the building instructions. When I got help to measure the output
power of the radios and the SWR (Standing wave ratio) I saw the
SWR value was too high. I thought the transmitting problem was a result of the high SWR
value. To enhanced the value two dipolantennas were placed outside under the belly of the
aircraft. The output power was measured to 9 watt and the SWR value
was 1 watt on both radios. It could be regarded as normal values. When
contacting a control tower about 3 miles away from ground they red
me five. After airborn I contacted the same tower and they red me
only two and sometimes one. I can still hear the traffic rather good but it is
strange that the transmitting became so weak in the air. It is the same
for both radios and I have also changed headset and used the handmic with the same bad result. On ground I have
also been transmitting to the tower 3 miles
away when the engine is running at about 2000 RPM with same good result. Now running out of ideas what to do.
One last theory is that a
static energi influence the transmitting but I should like to hear if anyone
have had a similar problem and if you also have a
solution
Christer
Wretlind
Box
29
179
03 Stenhamra
Stockholm Sweden
Tel
+46-856044100
Fax
+46-856044103
Cell
+46-703777212
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