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#1
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radio interference
I have a question for all the electronically minded pilots out there.
Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario Dittle FSG 2T radio Colibri data logger Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? |
#2
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radio interference
On Apr 28, 7:02*pm, ryanglover1969 wrote:
I have a question for all the electronically minded pilots out there. Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario * * * * * * * * * * * * * * * * * * Dittle FSG 2T radio * * * * * * * * * * * * * * * * * * Colibri data logger * * * * * * * * * * * * * * * * * * Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? Ryan, have you checked the stability of your power supply? I run a very similar set-up: Becker 3201, LX20, LX1600 and an iPAQ but have a very good battery. Place a digital voltmeter between and a digital ampere- meter inline (both with min.-max hold function) with the power leads and key the microphone. There is a good chance that the power supply collapses momentarily below the minimum required to run everything properly. Uli |
#3
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radio interference
ryanglover1969 wrote:
I have a question for all the electronically minded pilots out there. Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario Dittle FSG 2T radio Colibri data logger Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? It's just possible I suppose, that the cables from the colibri and/or Ipaq are resonating in the VHF - if their length is about 23 or 46 inches: if so, shielding or loading them might help. Brian W |
#4
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radio interference
Hi,
GPS data cables can be quite noisy electrically. That is why all Goddard cables are shielded. I've never had a customer complain about electrical noise with a Goddard cable or the PS-5a power converter. http://www.cumulus-soaring.com/goddard.htm Best Regards, Paul Remde Cumulus Soaring, Inc. "ryanglover1969" wrote in message ... I have a question for all the electronically minded pilots out there. Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario Dittle FSG 2T radio Colibri data logger Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? |
#5
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radio interference
On Apr 28, 4:02*pm, ryanglover1969 wrote:
I have a question for all the electronically minded pilots out there. Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario * * * * * * * * * * * * * * * * * * Dittle FSG 2T radio * * * * * * * * * * * * * * * * * * Colibri data logger * * * * * * * * * * * * * * * * * * Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? Some component is putting out RF, you can find which one by turning on your radio with no squelch then one by one turn on each component, GPS, vario, computer, recorder, etc. Each will add to the background noise, look for the one that makes the greatest increased noise. I recently found the new USB (stick) adapter for the SN-10 was pumping out RF. I fixed the problem by moving it away from the radio antenna lead. Hope this helps, JJ |
#6
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radio interference
Hi,
On a related subject. I have a customer with a new TruTrak Pictorial Turn and Bank that is complaining of noise on the radio when the unit is turned on. I've sold a fair number of these units with no previous complaints. The unit has only 12V power connections -so there are not GPS RS-232 data signals to make noise. Has anyone else had any electrical noise issues with this product? Any suggestions? My guess is that his radio antenna or other radio wires are poorly shielded and/or running past the TruTrak unit. Or the TruTrak's power leads are putting noise into the radio antenna. The unit has a small motor inside. The manufacturer suggested sending it back to them for warranty repair. But they didn't sound like they were confident that they could fix the problem. Best Regards, Paul Remde Cumulus Soaring, Inc. "Paul Remde" wrote in message ... Hi, GPS data cables can be quite noisy electrically. That is why all Goddard cables are shielded. I've never had a customer complain about electrical noise with a Goddard cable or the PS-5a power converter. http://www.cumulus-soaring.com/goddard.htm Best Regards, Paul Remde Cumulus Soaring, Inc. "ryanglover1969" wrote in message ... I have a question for all the electronically minded pilots out there. Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario Dittle FSG 2T radio Colibri data logger Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? |
#7
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radio interference
On Apr 29, 6:56*am, "Paul Remde" wrote:
Hi, On a related subject. *I have a customer with a new TruTrak Pictorial Turn and Bank that is complaining of noise on the radio when the unit is turned on. *I've sold a fair number of these units with no previous complaints.. The unit has only 12V power connections -so there are not GPS RS-232 data signals to make noise. *Has anyone else had any electrical noise issues with this product? *Any suggestions? *My guess is that his radio antenna or other radio wires are poorly shielded and/or running past the TruTrak unit. *Or the TruTrak's power leads are putting noise into the radio antenna. *The unit has a small motor inside. The manufacturer suggested sending it back to them for warranty repair. *But they didn't sound like they were confident that they could fix the problem. Best Regards, Paul Remde Cumulus Soaring, Inc. "Paul Remde" wrote in message ... Hi, GPS data cables can be quite noisy electrically. *That is why all Goddard cables are shielded. *I've never had a customer complain about electrical noise with a Goddard cable or the PS-5a power converter. http://www.cumulus-soaring.com/goddard.htm Best Regards, Paul Remde Cumulus Soaring, Inc. "ryanglover1969" wrote in message ... I have a question for all the electronically minded pilots out there. Every time I transmit my vario goes crazy. The funny thing is that when the colibri and or the Ipaq isn't connected it doesn't go crazy. My set up is as follows: LX 1600vario * * * * * * * * * * * * * * * * * *Dittle FSG 2T radio * * * * * * * * * * * * * * * * * *Colibri data logger * * * * * * * * * * * * * * * * * *Ipaq 3600 running SeeYou mobile What's the solution? I got some ferrite beads and put them in various locations with no success. should I shield the cables from the vario to the colibri and Ipaq??? The first suspect should always be coupling through the power supply, put a ferrite toroid or choke on the line right near the device suspected of causing the noise, or as a test power it from a separate battery and see if the problem is still there, if it is then it's RF coupling not via the power supply. If it is not the powerr supply then check cable/wiring routing, coax connectors and coax and wiring shielding. To be clear, since the TruTrak uses a solid state gyro, it does not contain a motor to spin a gyro. The "motor" may mean the mechanism to move the display background. That all may be irrelevant and the issue if there is one from the unit may be simply RF noise from digital electronics. Darryl |
#8
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radio interference
On Apr 28, 4:02*pm, ryanglover1969 wrote:
should I shield the cables from the vario to the colibri and Ipaq??? I think I'd first verify the problem can be reproduced using a hand held TX. Then start disconnecting leads to/from the vario. Try disconnecting each end of each lead in turn. Try powering the vario from a local battery rather than ships power and wiring. When you have pinned down the route the rf is entering the vario then you are in a better position to work out how to fix it. Large ferrite cores as close as possible to the vario may be a good starting point. (They work best if the wire is looped rather than just threaded) Changing wire routing many be another (make sure no vario wiring is close the radio coax). If the vario outputs are typical data and ground then screened twisted pair may be the next thing to try. It may also help to ensure all leads feeding the vario are run together as far as is possible. Having them spread out, or even forming a large loop will increase the risk of RFI. Perhaps the first question should be - did it always do this? If not what was added or changed, or has something (perhaps rf filtering components in the vario) failed. Andy (GY) |
#9
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radio interference
To be clear, since the TruTrak uses a solid state gyro, it does not
contain a motor to spin a gyro. I don't know the TruTrak, but I suspect it uses an oscillating piezo crystal, which implies a pretty high frequency electronic circuit, which might or might not interfere with the radio. |
#10
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radio interference
On Apr 29, 1:44*pm, John Smith wrote:
To be clear, since the TruTrak uses a solid state gyro, it does not contain a motor to spin a gyro. I don't know the TruTrak, but I suspect it uses an oscillating piezo crystal, which implies a pretty high frequency electronic circuit, which might or might not interfere with the radio. I don't know what MEMS gyro sensor is in the TruTrak but may only be 10s of kHz or so. And with very low drive current so not much power involved, and the oscillator electronics tends to be integrated onto the sensor assembly so not much chance for harmonic leakage. If the device is putting out RF, specially on the power supply leads I am much more prone to think of a failed DC/DC (switchmode) converter where the power involved is much more significant than the oscillator circuit inside the MEMS sensor, and possibly chopped at a higher frequency, and all conveniently close to the input wiring to leak back if something has gone wrong. Diagnosing the culprit here should be straight forward. Darryl |
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