nuckolls.bob(at)aeroelect
Guest
|
 Posted: Mon Sep 01, 2014 6:51 pm Post subject: Sandia Transponder interferes with Com Radio. |
 |
|
At 02:20 PM 9/1/2014, you wrote:
| Quote: | I have an Icon A-22 wired (no battery) into my Titan Tornado with a
Sandia STX-165. The antennas are as far apart as I can get them at
about 4'. When the transponder is interrogated and "replys", it
causes a popping in the radio that affects both the reception and
transmission. ATC can't understand my voice unless I turn the
transponder to "stby".
I tried using an external 12V battery for the Icom Radio and it
worked MUCH Better.
Any Thoughts out there ????
TJ
|
I presume the 'pop' you describe is every time the reply
light flashes - is that what YOU hear when listening
to the A-22? The same noise impressed on your transmitted
audio would not reduce your transmitted signal to unintelligible.
Have you heard the noise that ATC complains about?
You need to get a hand-held, stand off a hundred yards
and talk somebody in the cockpit of your airplane.
When you say "much better" . . . does that mean that
all is right with the universe or does the interference
simply go down such that you can be understood . . .
but the noise is still there?
It's very difficult to diagnose . . . much less recommend
remedy for 'noise' without actually hearing it. As a
radio amateur in my early electron-herding career, I learned
to identify source, propagation mode and remedy from simply
hearing the noise . . . all 'noises' have a signature and
a propagation mode . . . with unique remedies.
If the 'noise' is present in both transmit and receive,
it is unlikely that the propagation mode involves
a difficulty with antennas. The fact that things got
better when the com radio was operated on an independent
battery suggests a noise conducted on the DC power
lines. The fact that you're experiencing difficulty
in both transmit and receive also points to a problem
with DC power quality.
Which engine/alternator/rectifier-regulator
are you using? Do you have a schematic of the
power distribution system?
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
