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#11
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Electrical Help? Shielded speaker wires, but still static...
On Mar 2, 11:34*am, Doug Hoffman wrote:
On Mar 2, 3:23*am, "noel.wade" wrote: Any electric gurus out there willing to help? Ever since re-doing the wiring in my DG-300 last year, I get intermittent loud static on my radio. *It seems to be connected to whether or not I have ship's power going to my EW MicroRecorder. *The odd thing is that I followed the Becker wiring instructions and made sure to use a shielded wire for the connection from the Becker to the remote speaker/PCB assembly. *I would love ideas on how to help stop this! *Details below - any thoughts, see anything obvious that I'm failing to do? I've a Becker panel radio. *Last year it suddenly became unusable due to loud intermittent "static" noise. *I finally tried turning the squelch screw on the side of the case, you may have to remove your radio to get at it. *That fixed it. *Have no idea what changed. *Has worked flawlessly ever since. Regards, -Doug That may make the symptom go away but the risks now is not being able to hear weak radio transmissions. The extra concern here was you described it as a "loud noise". If its something that is breaking squelch with a large signal turning up squelch to silence this is a bad idea. If this suddenly started happening it could be something as simple as a wire behind the panel moved closer to another, a poor connector or break developing in a coaxial cable (cable flexed differently than previously), etc. It it may be worth trying to diagnose the root cause. Start with identifying what device is causing the periodic interference. Start by turning down the squelch so that you get fairly often occurring interference then poke around to make that better/ worse. Darryl |
#12
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Electrical Help? Shielded speaker wires, but still static...
On Mar 2, 2:48*pm, Darryl Ramm wrote:
That may make the symptom go away but the risks now is not being able to hear weak radio transmissions. It it may be worth trying to diagnose the root cause. Start with identifying what device is causing the periodic interference. Thanks Darryl, I'll check it out. Regards, -Doug |
#13
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Electrical Help? Shielded speaker wires, but still static...
Thanks for the tips so far, all.
One note: There is a ferrite toroid on the Goddard EW DB9f connector within about 3 inches of the EW MicroRecorder, and close to the PDA hookup as well. My PDA and antenna are slightly different; but I use basically this exact setup: http://www.cumulus-soaring.com/godda...c-DB9f-0-3.jpg (Note that the actual red-black power leads connect up at the DB-9 connector and have no ferrite toroids close-by. Not sure if that matters) Maybe I ought to try the Radio-shack noise filter that's discussed over at the AeroElectric Connection site (http://www.markdownalley.com/ products/270-051.jpg), and wire it just up-stream from the radio? I'll also play with the Coax antenna connector and let you all know what I find! Take care, --Noel |
#14
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Electrical Help? Shielded speaker wires, but still static...
On Mar 2, 6:45*pm, "noel.wade" wrote:
Thanks for the tips so far, all. One note: *There is a ferrite toroid on the Goddard EW DB9f connector within about 3 inches of the EW MicroRecorder, and close to the PDA hookup as well. *My PDA and antenna are slightly different; but I use basically this exact setup:http://www.cumulus-soaring.com/godda...c-DB9f-0-3.jpg (Note that the actual red-black power leads connect up at the DB-9 connector and have no ferrite toroids close-by. *Not sure if that matters) Maybe I ought to try the Radio-shack noise filter that's discussed over at the AeroElectric Connection site (http://www.markdownalley.com/ products/270-051.jpg), and wire it just up-stream from the radio? I'll also play with the Coax antenna connector and let you all know what I find! Take care, --Noel Have you tried combinations of the PDA powered off while the EW is on to see if it is the PDA or EW that is causing interference? I would do the easiest change possible first. Run each of the red and black wired though a ferrite toroid (one large enough to wrap the wire through a few times. Try it as far up the wire as you can. Keep those red/black wires as short as possible. Change one thing at once. Start by trying to fix interference at its source not the receiver unless you have to. Radio Shack junk: not in my glider! Darryl |
#15
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Electrical Help? Shielded speaker wires, but still static...
So in true troubleshooting/gremlin fashion, I spent over an hour
trying to get the radio to make static yesterday, and couldn't. :-P Argh! If this is a problem that only appears when I'm airborne, it's going to be a real pain to track down! *sigh* --Noel |
#16
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Electrical Help? Shielded speaker wires, but still static...
On Mar 7, 9:39*am, "noel.wade" wrote:
So in true troubleshooting/gremlin fashion, I spent over an hour trying to get the radio to make static yesterday, and couldn't. :-P Argh! If this is a problem that only appears when I'm airborne, it's going to be a real pain to track down! *sigh* --Noel Noel Do you have a transponder? If not ignore the rest of this post. If you do this could be related to transponder interrogation. Possibly a combination of noise from two sources breaking squelch. With a transponder the same basic comments apply, with coupling either through the power supplies or RF. If you switch briefly to standby in flight does the noise go away? If so start with the power supplies and try putting a filter/choke on the transponder power supply leads close to the unit. Also look at the transponder coax cable for problems. Ground radars will interrogate your transponder typically at 5 second (approach radar) or 12 second (area radar) intervals, of course you may be interrogated by multiple radars and also TCAS and similar systems (that can be at much higher rates (~1/sec). On the ground you may be outside of radar interrogation and if your transponder antenna is under the glider (where it usually should be) may not see TCAS interrogations on the ground. TCAS interrogations will come and go but radar will be consistent. Repeatable noise bursts at these kind of rates can be a clue its transponder related. Darryl |
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