First check that the TX annunciator comes on the 430 when you transmit. It
is right there with the COM frequencies in the upper left corner. If the
annunciator is coming on then check the antenna. I assume that you can hear
on 123.05?

Mike
MU-2


"Jon Kraus" wrote in message
...
My partner and I just bought a '79 Mooney M20J with a 2 year old Garmin
430 Comm/Nav as the Comm # 1 adn a Bendix 170B as the Comm/Nav # 2. (yes
we had a pre-buy and everything "seemed" fine") I have some strange issues
with the 430 that I am sure you can help guide me thru. Issues:

1.) On the ground if you set the 430 to our UNICOM freq TYQ 123.05 and do
a radio check they can not hear you. TYQ has an AWOS and you can hear that
fine on the ground (120.725).

2.) On the ground if you set the 170B (nav/com # 2) and do a radio check
they come back as "loud and clear" (and yes they are at the station when I
try the radio check on comm 1) :-)

3.) One time we were on the ground set up on the Comm 1 and trying to get
the UNICOM operator to hear us when a Piper over the airport said we were
"loud and clear".

4.) Our local UNICOM is 123.05. UMP an airport 15 miles away's UNICOM is
123.00. While airborn we kept picking up their transmissions.


I was going to try swapping antenna connections between Comm 1 and Comm 2
but as I peered under the dash looking for the antenna leads I said "I'll
screw more up then I'll ever fix so I left it alone)

Any suggestions or advise? Is this going to cost a fortune to fix? Thanks
in advance for your help!!

Jon Kraus
PP-ASEL-IA
Student Mooney Owner
4443H @ TYQ