---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 07/16/15: 19 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:54 AM - Re: Insulation displacement connectors???? (Charlie England) 2. 06:10 AM - Re: Insulation displacement connectors???? (Charlie England) 3. 07:48 AM - Re: Insulation displacement connectors???? (Bill Putney) 4. 08:00 AM - Re: Insulation displacement connectors???? (Robert L. Nuckolls, III) 5. 08:08 AM - Re: Insulation displacement connectors???? (Robert L. Nuckolls, III) 6. 08:48 AM - Re: Insulation displacement connectors???? (Eric Page) 7. 08:58 AM - Radio Buzz (Ross Home) 8. 10:58 AM - Re: Insulation displacement connectors???? (Charlie England) 9. 12:01 PM - Re: Insulation displacement connectors???? (David Josephson) 10. 12:02 PM - Re: Insulation displacement connectors???? (David Josephson) 11. 03:20 PM - Re: Radio Buzz (Ross Home) 12. 03:55 PM - Re: Radio Buzz (user9253) 13. 04:43 PM - Re: Re: Radio Buzz (n1deltawhiskey@comcast.net) 14. 05:17 PM - Re: Re: Radio Buzz () 15. 05:39 PM - Re: Re: Radio Buzz () 16. 06:21 PM - Re: Re: Radio Buzz (Dj Merrill) 17. 08:44 PM - Double Trouble (Bill Bradburry) 18. 10:19 PM - Re: Re: Radio Buzz (Kelly McMullen) 19. 11:20 PM - Re: Double Trouble (Graeme Hart) ________________________________ Message 1 _____________________________________ Time: 05:54:41 AM PST US Subject: Re: AeroElectric-List: Insulation displacement connectors???? From: Charlie England Outlawed in the '70s? Maybe so on that particular connector, but I've watched AT&T techs use http://www.specialized.net/Specialized/3M-Scotchlok-IDC-UR2-Connectors-1926-AWG-100Pk-4051.aspx as recently as a few weeks ago. I appreciate the 'be safe' sentiment, but 'bet your life' on the signal wires in an intercom? Isn't that a bit of a knee-jerk reaction to anything unfamiliar? If I'm not mistaken, this list came out of the desire to find products and techniques that are *not* 'in common aeronautical use', so we can improve on the products and/or techniques. We wouldn't have composite airframes (or even aluminum ones) if someone hadn't been the 1st to use something that was not 'in common aeronautical use'. It would be more helpful to me if you could say something at least marginally quantified, like, 'That terminal fails in 0.05% of connections, vs a 0.00004% failure rate for PIDG terminals'. Thanks, Charlie On Wed, Jul 15, 2015 at 5:57 PM, Bill Putney wrote: > Charlie, > > I know splicers use to love these things but even the telco's outlawed > these in the 70's (i think). I'm surprised you can even find them on eBay. > > I guess you can use whatever you want to bet your life on in experimental > but I'd stick with what's in common aeronautical use. > > Bill > > On 7/15/15 3:12 PM, Charlie England wrote: > > Anyone know if any type of insulation displacement crimp connectors have > ever been used in aircraft applications? I used hundreds (thousands?) of > EA-7759 Plain B Wire Connectors, similar to > http://www.ebay.com/itm/371364009928?rmvSB=true > > in burglar alarm & other data cable installations, & never have had a > failed connection in 3 decades (though admittedly, I was stripping & > twisting the wires prior to crimping). For those who haven't seen these, > they have 'teeth' inside that pierce the insulation when crimped. > > I'm looking at the need to 'daisy chain' several signal grounds from a > single dSub pin (in this case, an intercom), and these tiny connectors > really look attractive to stagger the joints over several inches of wire > near the pin. I tested one by opening the closed end with a pair of pliers, > running the 'trunk' wire through the connector, inserting the 'branch' > wire, and crimping (no wire stripping involved). Seems to work fine in > penetrating the tefzel insulation, and I can't budge the wires with a > manual tug test. > > I have no desire to do this for high current applications, but for > signal wires, it sure makes an attractive package due to it's small size. > Not sure about the type of insulation, but I'm pretty sure it won't > spontaneously combust & drag the plane out of the sky. > > Thoughts? > > Charlie > > > * > > > * > > ________________________________ Message 2 _____________________________________ Time: 06:10:46 AM PST US Subject: Re: AeroElectric-List: Insulation displacement connectors???? From: Charlie England On Wed, Jul 15, 2015 at 8:25 PM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 05:12 PM 7/15/2015, you wrote: > > Anyone know if any type of insulation displacement crimp connectors have > ever been used in aircraft applications? I used hundreds (thousands?) of > EA-7759 Plain B Wire Connectors, similar to=C3=82 > http://www.ebay.com/itm/371364009928?rmvSB=true > > in burglar alarm & other data cable installations, & never have had a > failed connection in 3 decades (though admittedly, I was stripping & > twisting the wires prior to crimping). For those who haven't seen these, > they have 'teeth' inside that pierce the insulation when crimped > > > Suggest you use bussed d-sub connectors > > http://tinyurl.com/nzm3e2f > > I've got some bussing boards available if > you want them. > > > Bob . . . > > Thanks, Bob; I've already got one of those dSub avionics GND busses mounted in the plane. My specific application for those crimps is the signal ground terminal in a DRE intercom (it has two ground pins in the 25pin dSub which are electrically common internally). My intent was to run one of the gnd pins to the avionics GND bus and the other to the gnd terminals of the various inputs/outputs (mic, headset, music, etc) to the intercom. The crimps would have been used to bring the various signal ground wires to within the 1st few inches of dSub connector on the DRE. Would it work as well to just take all those signal grounds to the avionics dSub ground bus? I was trying to take the signal grounds directly to the intercom to keep ground loop possibilities to an absolute minimum, and an additional dSub bus for just 3 or 4 wires seems to be overkill (and bulky). Thanks, Charlie ________________________________ Message 3 _____________________________________ Time: 07:48:39 AM PST US From: Bill Putney Subject: Re: AeroElectric-List: Insulation displacement connectors???? I know a lot of guys have the old beans squirreled away but they tend to make noisy connections and are corrosion prone. The Scotchloks are what the telco's moved to after they outlawed the beans. I take things about my airplane very seriously. If nothing else I use the "How stupid would I feel" rule. Like how stupid would I feel if my intercom quit on short final to a busy towered airport in marginal weather because I didn't take the time to strip the wires and use the right connectors? It's a human factors thing. People can handle about 3 things going wrong before they completely unravel. If the weather suddenly gets bad you can turn around and go the other way, add strong winds in that reverse direction now depleting your fuel faster than you planned. If the intercom goes out and you can't contact Flightwatch or ATC to find out where the closest open airport is and you've got a real problem It wouldn't have been a big problem in CAVU but this day it's the third thing. I don't mean to say that every shortcut you take is going to kill you but you never know what the third thing is going to be. There are old pilots and there are bold pilots but there are very few old bold pilots. Bill On 7/16/15 05:52, Charlie England wrote: > Outlawed in the '70s? Maybe so on that particular connector, but I've > watched AT&T techs use > http://www.specialized.net/Specialized/3M-Scotchlok-IDC-UR2-Connectors-1926-AWG-100Pk-4051.aspx > as recently as a few weeks ago. > > I appreciate the 'be safe' sentiment, but 'bet your life' on the > signal wires in an intercom? Isn't that a bit of a knee-jerk reaction > to anything unfamiliar? If I'm not mistaken, this list came out of the > desire to find products and techniques that are *not* 'in common > aeronautical use', so we can improve on the products and/or > techniques. We wouldn't have composite airframes (or even aluminum > ones) if someone hadn't been the 1st to use something that was not 'in > common aeronautical use'. > > It would be more helpful to me if you could say something at least > marginally quantified, like, 'That terminal fails in 0.05% of > connections, vs a 0.00004% failure rate for PIDG terminals'. > > Thanks, > > Charlie > > On Wed, Jul 15, 2015 at 5:57 PM, Bill Putney > wrote: > > Charlie, > > I know splicers use to love these things but even the telco's > outlawed these in the 70's (i think). I'm surprised you can even > find them on eBay. > > I guess you can use whatever you want to bet your life on in > experimental but I'd stick with what's in common aeronautical use. > > Bill > > On 7/15/15 3:12 PM, Charlie England wrote: >> Anyone know if any type of insulation displacement crimp >> connectors have ever been used in aircraft applications? I used >> hundreds (thousands?) of EA-7759 Plain B Wire Connectors, similar to >> http://www.ebay.com/itm/371364009928?rmvSB=true >> >> in burglar alarm & other data cable installations, & never have >> had a failed connection in 3 decades (though admittedly, I was >> stripping & twisting the wires prior to crimping). For those who >> haven't seen these, they have 'teeth' inside that pierce the >> insulation when crimped. >> >> I'm looking at the need to 'daisy chain' several signal grounds >> from a single dSub pin (in this case, an intercom), and these >> tiny connectors really look attractive to stagger the joints over >> several inches of wire near the pin. I tested one by opening the >> closed end with a pair of pliers, running the 'trunk' wire >> through the connector, inserting the 'branch' wire, and crimping >> (no wire stripping involved). Seems to work fine in penetrating >> the tefzel insulation, and I can't budge the wires with a manual >> tug test. >> >> I have no desire to do this for high current applications, but >> for signal wires, it sure makes an attractive package due to it's >> small size. Not sure about the type of insulation, but I'm pretty >> sure it won't spontaneously combust & drag the plane out of the sky. >> >> Thoughts? >> >> Charlie >> * >> >> >> * > > * > > ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List > tp://forums.matronics.com > _blank">http://www.matronics.com/contribution > > * > > > * > > > * ________________________________ Message 4 _____________________________________ Time: 08:00:39 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Insulation displacement connectors???? > >It would be more helpful to me if you could say something at least >marginally quantified, like, 'That terminal fails in 0.05% of >connections, vs a 0.00004% failure rate for PIDG terminals'. How about, "I used ID connectors and ribbon cable in a pitch trim project on a Lear waaayyy back when. At about the 15-year mark, I inquired of the field service guys who were supporting that product. Failure rates were pleasingly low; that product was a fleet retrofit of about 500+ airplanes and the pitch trim controllers came in for attention about 5x a year . . . so about 1%/year for the design. The ID connection devices accounted for about 50% of the service issues. Further, that box was located in the vertical fin, just under the leading edge of the stabilizer . . . hence, subject to about the worst of the sheltered environs on the aircraft. From that experience I would deduce that while the failure rates for ID connections were low, they still accounted for the majority of field failures in the design. Keep in mind also that the teleco's and network communities have been using ID connections for decades . . . of course the environments are not nearly as severe as the interior of a biz-jet's vertical fin . . . but still subject to humidity, temperature cycles and exposure to noxious atmosphere. It would seem that an ID connector used with wires in the connector's design window is a low risk venture. Bob . . . ________________________________ Message 5 _____________________________________ Time: 08:08:33 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Insulation displacement connectors???? > >Thanks, Bob; I've already got one of those dSub avionics GND busses >mounted in the plane. My specific application for those crimps is >the signal ground terminal in a DRE intercom (it has two ground pins >in the 25pin dSub which are electrically common internally). My >intent was to run one of the gnd pins to the avionics GND bus and >the other to the gnd terminals of the various inputs/outputs (mic, >headset, music, etc) to the intercom. The crimps would have been >used to bring the various signal ground wires to within the 1st few >inches of dSub connector on the DRE. > >Would it work as well to just take all those signal grounds to the >avionics dSub ground bus? I was trying to take the signal grounds >directly to the intercom to keep ground loop possibilities to an >absolute minimum, and an additional dSub bus for just 3 or 4 wires >seems to be overkill (and bulky). The core idea for the AGB was to craft a single point ground for all signals, power and shields. If it's just 3-4 wires and just shields, why not solder and heat-shrink? In reliability studies, a connector drives up parts count . . . a soldered joint is calculated as the joining of several parts into one part such that there is better than 10 to the minus bazillion reliability. Solder and shrink is almost never a bad idea. Is is frowned upon in the factories because solder is a skill-driven process with tools that burn fingers, upholstery, carpets, etc. But for the OBAM aircraft crowd, solder should represent no unsurmountable hazard. Bob . . . ________________________________ Message 6 _____________________________________ Time: 08:48:49 AM PST US Subject: Re: AeroElectric-List: Insulation displacement connectors???? From: Eric Page One additional data point. I used IDCs very similar to those in the OP's qu estion (mine were blue and slightly smaller) to wire an alarm system in my l ast home in 2004. Those connections were in an attic in Phoenix, where unde r-roof temperatures were regularly above 120 deg F (no mechanical stress or v ibration, and very low humidity). The alarm system was functioning perfectl y when I sold the house in March, almost eleven years after installation. Eric > On Jul 16, 2015, at 7:59 AM, Robert L. Nuckolls, III wrote: > >> >> It would be more helpful to me if you could say something at least margin ally quantified, like, 'That terminal fails in 0.05% of connections, vs a 0. 00004% failure rate for PIDG terminals'. > > How about, "I used ID connectors and ribbon cable > in a pitch trim project on a Lear waaayyy back when. > At about the 15-year mark, I inquired of the field > service guys who were supporting that product. Failure > rates were pleasingly low; that product was > a fleet retrofit of about 500+ airplanes and the > pitch trim controllers came in for attention about > 5x a year . . . so about 1%/year for the design. > The ID connection devices accounted for about 50% of the > service issues. > > Further, that box was located in the vertical fin, > just under the leading edge of the stabilizer . . . > hence, subject to about the worst of the sheltered > environs on the aircraft. > > =46rom that experience I would deduce that while > the failure rates for ID connections were low, > they still accounted for the majority of field > failures in the design. > > Keep in mind also that the teleco's and network > communities have been using ID connections for > decades . . . of course the environments are not nearly > as severe as the interior of a biz-jet's vertical fin . . . > but still subject to humidity, temperature cycles and > exposure to noxious atmosphere. It would seem that > an ID connector used with wires in the connector's > design window is a low risk venture. > > Bob . . . ________________________________ Message 7 _____________________________________ Time: 08:58:42 AM PST US From: "Ross Home" Subject: AeroElectric-List: Radio Buzz I know that asking about the cause of a buzz in your radios is like asking a mechanic about a noise you hear when you are driving but since you are all here and know way more than me I will describe my situation and how I plan to proceed. Set-up RV-6A GX-60 Com SL-30 Com SL-15 Intercom Two COMANT VHF COMMUNICATIONS antenna mounted on the centerline of the belly (one below the seat, one below the baggage compartment) I am getting significant static like noise when I connect either radio to the front antenna. I have switched the antennas with no change. The front antenna connection goes pretty much straight down to the floor with a short male-male piece of coax (which I have changed with no result) to connect the female ends of the antenna and radio coax. The antenna wire crosses a bunch of wires at a 90 degree angle and goes right next to where I have a temporary battery placed. My conclusions: The radios, antennas and cables are all ok so I must be picking up interference from either the wires or the battery. Solution: Move the battery and see if it helps (I would have last night but ran out of time) What do you think? Also, I get a very slight hum when I put my hand near (1 inch away) or touch the SL-30. It doesn't bother me but I find it interesting that I just have to get near the radio for the noise to happen. Thanks all, Ross Mickey N9PT RV-6A ________________________________ Message 8 _____________________________________ Time: 10:58:27 AM PST US Subject: Re: AeroElectric-List: Insulation displacement connectors???? From: Charlie England On July 16, 2015 10:05:36 AM CDT, "Robert L. Nuckolls, III" wrote: > >> >>Thanks, Bob; I've already got one of those dSub avionics GND busses >>mounted in the plane. My specific application for those crimps is >>the signal ground terminal in a DRE intercom (it has two ground pins >>in the 25pin dSub which are electrically common internally). My >>intent was to run one of the gnd pins to the avionics GND bus and >>the other to the gnd terminals of the various inputs/outputs (mic, >>headset, music, etc) to the intercom. The crimps would have been >>used to bring the various signal ground wires to within the 1st few >>inches of dSub connector on the DRE. >> >>Would it work as well to just take all those signal grounds to the >>avionics dSub ground bus? I was trying to take the signal grounds >>directly to the intercom to keep ground loop possibilities to an >>absolute minimum, and an additional dSub bus for just 3 or 4 wires >>seems to be overkill (and bulky). > > The core idea for the AGB was to craft a single > point ground for all signals, power and shields. > If it's just 3-4 wires and just shields, why > not solder and heat-shrink? > > In reliability studies, a connector drives up > parts count . . . a soldered joint is calculated > as the joining of several parts into one part > such that there is better than 10 to the minus > bazillion reliability. Solder and shrink is almost > never a bad idea. Is is frowned upon in the factories > because solder is a skill-driven process with tools > that burn fingers, upholstery, carpets, etc. But > for the OBAM aircraft crowd, solder should represent > no unsurmountable hazard. > > > Bob . . . Solder/shrink is what I've done in other places, so that's no problem. But a 10 second operation vs a 10 minute one surely is tempting. :-) ________________________________ Message 9 _____________________________________ Time: 12:01:58 PM PST US Subject: AeroElectric-List: Re: Insulation displacement connectors???? From: David Josephson In a word, no. B connectors are ugly, but work well given two conditions: (a) DC sealing current to re-establish connection when compromised by oxidation, and (b) no vibration. The later jelly-B connectors try to solve the oxidation problem by immersing the pierces wire in vaseline to keep air out. Not in my airplane. ________________________________ Message 10 ____________________________________ Time: 12:02:01 PM PST US Subject: AeroElectric-List: Re: Insulation displacement connectors???? From: David Josephson In a word, no. B connectors are ugly, but work well given two conditions: (a) DC sealing current to re-establish connection when compromised by oxidation, and (b) no vibration. The later jelly-B connectors try to solve the oxidation problem by immersing the pierces wire in vaseline to keep air out. Not in my airplane. ________________________________ Message 11 ____________________________________ Time: 03:20:56 PM PST US From: "Ross Home" Subject: AeroElectric-List: RE: Radio Buzz More info. My plane is not in a state that allows me to start the engine (wings are off) so this is occurring with just the master switch on. No strobes or landing lights on, just panel instruments on. The main change since I last used the radios is the installation of a Advanced Flight System 5600 EFIS but the only wiring from that which are near my antenna cable are the GPS, Comm Radio and Autopilot serial/ARINC wires. Ross From: Ross Home [mailto:rossmickey@comcast.net] Sent: Thursday, July 16, 2015 8:57 AM Subject: Radio Buzz I know that asking about the cause of a buzz in your radios is like asking a mechanic about a noise you hear when you are driving but since you are all here and know way more than me I will describe my situation and how I plan to proceed. Set-up RV-6A GX-60 Com SL-30 Com SL-15 Intercom Two COMANT VHF COMMUNICATIONS antenna mounted on the centerline of the belly (one below the seat, one below the baggage compartment) I am getting significant static like noise when I connect either radio to the front antenna. I have switched the antennas with no change. The front antenna connection goes pretty much straight down to the floor with a short male-male piece of coax (which I have changed with no result) to connect the female ends of the antenna and radio coax. The antenna wire crosses a bunch of wires at a 90 degree angle and goes right next to where I have a temporary battery placed. My conclusions: The radios, antennas and cables are all ok so I must be picking up interference from either the wires or the battery. Solution: Move the battery and see if it helps (I would have last night but ran out of time) What do you think? Also, I get a very slight hum when I put my hand near (1 inch away) or touch the SL-30. It doesn't bother me but I find it interesting that I just have to get near the radio for the noise to happen. Thanks all, Ross Mickey N9PT RV-6A ________________________________ Message 12 ____________________________________ Time: 03:55:02 PM PST US Subject: AeroElectric-List: Re: Radio Buzz From: "user9253" Is the temporary battery powering the avionics? Is the negative battery terminal grounded to the airframe? Turn everything on, then measure the voltage between the negative battery terminal and the radio case. How many millivolts? Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=444845#444845 ________________________________ Message 13 ____________________________________ Time: 04:43:21 PM PST US From: n1deltawhiskey@comcast.net Subject: Re: AeroElectric-List: RE: Radio Buzz Ross, What you are picking up is probably some sort of RFI or EMI. I doubt it will be coming from your battery unless you have some grounding issues, and may not even be coming from your wires. That leaves the noise generators which includes all of your other avionics and electrical devices and systems including strobes, engine/ignition system, etc. And that is assuming there is no noise generated because of ground loops in your aircraft. So the process is to eliminate noise generators, one by one, assuming there is no noise in your antenna/cable/radio when tested with ALL other electrical equipment turned off. If your radio still generates noise when you put your hand near it, I would consider grounding the case. Then, turn on one electrical device at a time to see if it generates any noise. With my GX-60, I noticed the Dynon D10A introduced some hum in the system when turned on. The strobe circuit also introduced some noise. Test each electrical system sequentially to find the biggest "offenders". This process will give you some idea of where to look to attempt to reduce noise in the com system. I recently had my transponder checked and asked about noise in the radio system. He commented that some noise tended to "go with the territory". Not necessarily related, I queried him about very loud feedback when attempting to transmit. Turns out that a setting in the GX-60 for the microphone was set to the maximum as shipped from the factory. The point here is to also check you GX-60 setup parameters. Some adjustments there might assist in correcting your issues. Doug Windhorn ________________________________ Message 14 ____________________________________ Time: 05:17:00 PM PST US From: Subject: Re: AeroElectric-List: RE: Radio Buzz http://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=3&t= 52024 From: Ross Home Sent: Thursday, July 16, 2015 6:19 PM Subject: AeroElectric-List: RE: Radio Buzz More info My plane is not in a state that allows me to start the engine (wings are off) so this is occurring with just the master switch on. No strobes or landing lights on, just panel instruments on. The main change since I last used the radios is the installation of a Advanced Flight System 5600 EFIS but the only wiring from that which are near my antenna cable are the GPS, Comm Radio and Autopilot serial/ARINC wires. Ross From: Ross Home [mailto:rossmickey@comcast.net] Sent: Thursday, July 16, 2015 8:57 AM Subject: Radio Buzz I know that asking about the cause of a buzz in your radios is like asking a mechanic about a noise you hear when you are driving but since you are all here and know way more than me I will describe my situation and how I plan to proceed. Set-up RV-6A GX-60 Com SL-30 Com SL-15 Intercom Two COMANT VHF COMMUNICATIONS antenna mounted on the centerline of the belly (one below the seat, one below the baggage compartment) I am getting significant static like noise when I connect either radio to the front antenna. I have switched the antennas with no change. The front antenna connection goes pretty much straight down to the floor with a short male-male piece of coax (which I have changed with no result) to connect the female ends of the antenna and radio coax. The antenna wire crosses a bunch of wires at a 90 degree angle and goes right next to where I have a temporary battery placed. My conclusions: The radios, antennas and cables are all ok so I must be picking up interference from either the wires or the battery. Solution: Move the battery and see if it helps (I would have last night but ran out of time) What do you think? Also, I get a very slight hum when I put my hand near (1 inch away) or touch the SL-30. It doesn=99t bother me but I find it interesting that I just have to get near the radio for the noise to happen. Thanks all, Ross Mickey N9PT RV-6A ________________________________ Message 15 ____________________________________ Time: 05:39:59 PM PST US From: Subject: Re: AeroElectric-List: RE: Radio Buzz Ooops, cross post. Do not archive. From: kboatright1@comcast.net Sent: Thursday, July 16, 2015 8:15 PM Subject: Re: AeroElectric-List: RE: Radio Buzz http://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=3&t= 52024 From: Ross Home Sent: Thursday, July 16, 2015 6:19 PM Subject: AeroElectric-List: RE: Radio Buzz More info My plane is not in a state that allows me to start the engine (wings are off) so this is occurring with just the master switch on. No strobes or landing lights on, just panel instruments on. The main change since I last used the radios is the installation of a Advanced Flight System 5600 EFIS but the only wiring from that which are near my antenna cable are the GPS, Comm Radio and Autopilot serial/ARINC wires. Ross From: Ross Home [mailto:rossmickey@comcast.net] Sent: Thursday, July 16, 2015 8:57 AM Subject: Radio Buzz I know that asking about the cause of a buzz in your radios is like asking a mechanic about a noise you hear when you are driving but since you are all here and know way more than me I will describe my situation and how I plan to proceed. Set-up RV-6A GX-60 Com SL-30 Com SL-15 Intercom Two COMANT VHF COMMUNICATIONS antenna mounted on the centerline of the belly (one below the seat, one below the baggage compartment) I am getting significant static like noise when I connect either radio to the front antenna. I have switched the antennas with no change. The front antenna connection goes pretty much straight down to the floor with a short male-male piece of coax (which I have changed with no result) to connect the female ends of the antenna and radio coax. The antenna wire crosses a bunch of wires at a 90 degree angle and goes right next to where I have a temporary battery placed. My conclusions: The radios, antennas and cables are all ok so I must be picking up interference from either the wires or the battery. Solution: Move the battery and see if it helps (I would have last night but ran out of time) What do you think? Also, I get a very slight hum when I put my hand near (1 inch away) or touch the SL-30. It doesn=99t bother me but I find it interesting that I just have to get near the radio for the noise to happen. Thanks all, Ross Mickey N9PT RV-6A href="http://www.matronics.com/Navigator?AeroElectric-List">http://www. matronics.com/Navigator?AeroElectric-List href="http://forums.matronics.com">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/c ________________________________ Message 16 ____________________________________ Time: 06:21:31 PM PST US From: Dj Merrill Subject: Re: AeroElectric-List: RE: Radio Buzz On 7/16/2015 6:19 PM, Ross Home wrote: > My plane is not in a state that allows me to start the engine (wings are > off) so this is occurring with just the master switch on. No strobes or > landing lights on, just panel instruments on. Just a random thought, but is this inside your hangar? Is there anything on in the hangar, like lights, a refrigerator, etc? The noise might not be coming from anything in the plane. -Dj -- Dj Merrill - N1JOV - EAA Chapter 87 Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ Glastar Flyer N866RH - http://deej.net/glastar/ ________________________________ Message 17 ____________________________________ Time: 08:44:18 PM PST US From: "Bill Bradburry" Subject: AeroElectric-List: Double Trouble The last couple of days I have been getting duplicates of every msg from the Aeroelectric list. Is anyone else having this problem? I don't think it is on my end since only the list emails are affected. Bill ________________________________ Message 18 ____________________________________ Time: 10:19:20 PM PST US Subject: Re: AeroElectric-List: RE: Radio Buzz From: Kelly McMullen Excellent thought. I had squelch break of sorts on my SL30 until I realized it came and went with the light switch. One florescent tube was causing its ballast to put out a bunch of RFI. New tube, noise gone. On 7/16/2015 6:20 PM, Dj Merrill wrote: > > On 7/16/2015 6:19 PM, Ross Home wrote: >> My plane is not in a state that allows me to start the engine (wings are >> off) so this is occurring with just the master switch on. No strobes or >> landing lights on, just panel instruments on. > > Just a random thought, but is this inside your hangar? Is there > anything on in the hangar, like lights, a refrigerator, etc? > > The noise might not be coming from anything in the plane. > > -Dj > ________________________________ Message 19 ____________________________________ Time: 11:20:48 PM PST US Subject: Re: AeroElectric-List: Double Trouble From: Graeme Hart Tm8gcHJvYmxlbSBoZXJlLiBJIGFtIG9ubHkgcmVjZWl2aW5nIG9uZSBjb3B5Lg0KDQo+IE9uIDE3 IEp1bCAyMDE1IDE2OjA0LCAiQmlsbCBCcmFkYnVycnkiIDxiYnJhZGJ1cnJ5QHZlcml6b24ubmV0 PiB3cm90ZToNCj4+DQo+PiBUaGUgbGFzdCBjb3VwbGUgb2YgZGF5cyBJIGhhdmUgYmVlbiBnZXR0 aW5nIGR1cGxpY2F0ZXMgb2YgZXZlcnkgbXNnIGZyb20NCnRoZSBBZXJvZWxlY3RyaWMgbGlzdC4g IElzIGFueW9uZSBlbHNlIGhhdmluZyB0aGlzIHByb2JsZW0/ICBJIGRvbuKAmXQgdGhpbmsNCml0 IGlzIG9uIG15IGVuZCBzaW5jZSBvbmx5IHRoZSBsaXN0IGVtYWlscyBhcmUgYWZmZWN0ZWQuDQo+ Pg0KPj4NCj4+DQo+PiBCaWxsDQo+Pg0KPj4gXy09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0NCj4+IF8tPSAgICAgICAgICAtIFRoZSBB ZXJvRWxlY3RyaWMtTGlzdCBFbWFpbCBGb3J1bSAtDQo+PiBfLT0gVXNlIHRoZSBNYXRyb25pY3Mg TGlzdCBGZWF0dXJlcyBOYXZpZ2F0b3IgdG8gYnJvd3NlDQo+PiBfLT0gdGhlIG1hbnkgTGlzdCB1 dGlsaXRpZXMgc3VjaCBhcyBMaXN0IFVuL1N1YnNjcmlwdGlvbiwNCj4+IF8tPSBBcmNoaXZlIFNl YXJjaCAmIERvd25sb2FkLCA3LURheSBCcm93c2UsIENoYXQsIEZBUSwNCj4+IF8tPSBQaG90b3No YXJlLCBhbmQgbXVjaCBtdWNoIG1vcmU6DQo+PiBfLT0NCj4+IF8tPSAgIC0tPiBodHRwOi8vd3d3 Lm1hdHJvbmljcy5jb20vTmF2aWdhdG9yP0Flcm9FbGVjdHJpYy1MaXN0DQo+PiBfLT0NCj4+IF8t PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09DQo+PiBfLT0gICAgICAgICAgICAgICAtIE1BVFJPTklDUyBXRUIgRk9SVU1TIC0NCj4+IF8t PSBTYW1lIGdyZWF0IGNvbnRlbnQgYWxzbyBhdmFpbGFibGUgdmlhIHRoZSBXZWIgRm9ydW1zIQ0K Pj4gXy09DQo+PiBfLT0gICAtLT4gaHR0cDovL2ZvcnVtcy5tYXRyb25pY3MuY29tDQo+PiBfLT0N Cj4+IF8tPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09DQo+PiBfLT0gICAgICAgICAgICAgLSBMaXN0IENvbnRyaWJ1dGlvbiBXZWIgU2l0 ZSAtDQo+PiBfLT0gIFRoYW5rIHlvdSBmb3IgeW91ciBnZW5lcm91cyBzdXBwb3J0IQ0KPj4gXy09 ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgLU1hdHQgRHJhbGxlLCBMaXN0IEFkbWluLg0K Pj4gXy09ICAgLS0+IGh0dHA6Ly93d3cubWF0cm9uaWNzLmNvbS9jb250cmlidXRpb24NCj4+IF8t PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09DQo+Pg0K ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.