Today's Message Index:
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1. 11:33 AM - More Strobe Noise (chinesespaceman)
2. 09:06 PM - Antenna Placement ?s (jvolkober)
Message 1
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| Subject: | More Strobe Noise |
Guys, I've been trying for months to get rid of strobe noise, having searched on
this site for guidance. If I describe symptoms and cures tried maybe someone
can offer a thought?
System is a 2 head Skyflash, with strobes mounted top and bottom of fuselage. Top
strobe head is only 18 inches in front of the radio antenna.
I get a crack 2 cracks through the headset each time either of the heads fires.
Wiring to the strobe heads is now shielded with the shields from each wire joined
and run back to a clean earth.
The noise is not coming through the intercom, only the radio and not on all channels
- just the ones I commonly use.......
If I hold a handheld close to the aircraft I can just about hear the strobes firing.
Was unable to check the handheld when using my aircraft antenna as different
connections.
If I unplug my antenna connection from the rear of the radio I get silence, so
deducted that I had RFI that was coming into the radio from either the coax or
the core. I ran a temporary wire from my antenna groundplane to a clean earth.
Doing this, I got the first 3 cracks, then the noise reduced to a hardly detectable
level. Job done, I thought. SO I made this wiring permanent and tested
again, same result; job done I thought, so closed everything up.
Flight tested and found it back to it's normal levels - to the point where I won't
turn the strobes on unless visibility really requires it.
Is there a filter available to go in line with my coax and the radio?
Should I change the coax to a known high grade and re-route?
Any suggestions welcomed as this is driving me mad.
P.S. I have fitted a forest of earth to this wooden aircraft and run every ground
down to this, then it connects through the firewall with a brass bolt to a
good earth point on the engine. Aircraft is negative earth.
Thanks in advance
Gavin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=341133#341133
Message 2
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| Subject: | Antenna Placement ?s |
I'm building and RV9A. According to my antenna manufacturer, RAMI, Inc, instructions
the antenna should be 24 inches from any other antenna and reflective surfaces,
e.g. landing gear. My plan has been to mount a Com antenna under the
pilot and passenger seats with the transponder antenna about 24 inches further
aft. However this would put each of Com antennas within 24 inches of the landing
gear and the step. The only way to avoid this would be to mount them on
or about the center line on the belly along with the transponder antenna.
Question, how much of a problem will I have if the antenna are within one foot
to 18inches of the gear or the step. Secondarily, how much distance should I
have between the Com antenna and the transponder antenna, which will also be mounted
on the belly about 24 inches behind the baggage bulk head (with the Dynon
transponder in close proximity.)
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=341172#341172
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