---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 07/17/15: 17 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:47 AM - Re: Re: Radio Buzz (Hal Benjamin) 2. 04:49 AM - Re: Double Trouble (Charlie England) 3. 07:32 AM - Re: Radio Buzz (Robert L. Nuckolls, III) 4. 07:52 AM - Re: Radio Buzz (Ross Home) 5. 09:07 AM - Re: Radio Buzz (Kelly McMullen) 6. 11:04 AM - Re: Radio Buzz (ARGOLDMAN@aol.com) 7. 11:05 AM - Re: Radio Buzz (ARGOLDMAN@aol.com) 8. 11:46 AM - Re: Radio Buzz (Robert L. Nuckolls, III) 9. 12:45 PM - Re: Radio Buzz (Ross Home) 10. 01:50 PM - Re: Young Aviators & B-25 intercom (jrevens) 11. 01:59 PM - Re: Re: Young Aviators & B-25 intercom (Bill) 12. 04:27 PM - Voltage reducer (Janet Amtmann) 13. 06:38 PM - Shopping at AirVenture (Art Zemon) 14. 07:23 PM - Re: Shopping at AirVenture (Kenneth Johnson) 15. 07:40 PM - Re: Shopping at AirVenture (C&K) 16. 07:58 PM - Re: Voltage reducer (user9253) 17. 09:17 PM - Re: Shopping at AirVenture (A R Goldman) ________________________________ Message 1 _____________________________________ Time: 04:47:00 AM PST US Subject: Re: AeroElectric-List: RE: Radio Buzz From: Hal Benjamin I have a handheld radio in my hanger that I listen to while doing my preflight. Battery chargers for electronic devices often cause noise. Hal Benjamin RV4, Long Island, NY Sent from my iPad > On Jul 17, 2015, at 1:16 AM, Kelly McMullen wrote: > > > 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 2 _____________________________________ Time: 04:49:57 AM PST US Subject: Re: AeroElectric-List: Double Trouble From: Charlie England On Thu, Jul 16, 2015 at 10:38 PM, Bill Bradburry wrote: > 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 =99t think > it is on my end since only the list emails are affected. > > > Bill > > It's probably a glitch with your ISP, or some intermediate transfer point in the interwebs. :-) I've had similar things happen in the past, and they typically resolve themselves in a few days. Charlie ________________________________ Message 3 _____________________________________ Time: 07:32:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Radio Buzz At 10:57 AM 7/16/2015, you wrote: >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. This sounds like a radiated noise issue which is almost never an issue with grounding or other installation errors . . . it's usually some device that is not designed to live in harmony on airplanes. Find a hand-held radio. Adjust to unused frequency and open the squelch so you can hear the background 'hiss'. Then use it to 'probe' about the various devices on the airplane. Hand-held vhf transceivers and 9v transistor am radios have been quite useful for probing noise sources of all stripe. Also, conduct a power-down study. Pull all fuses/breakers that power up the ship's accessories. If noise is gone, replace fuses one at a time until the noise comes back. Bob . . . ________________________________ Message 4 _____________________________________ Time: 07:52:59 AM PST US From: "Ross Home" Subject: RE: AeroElectric-List: Radio Buzz I will try this. What is puzzling is that the antenna connection that leads to the rear antenna is at the firewall about 18 inches and level with my GX-60. I can easily unhook the GX-60 cable from the front antenna (which is under the floor directly beneath the GX-60) and hook it to the rear antenna connection which is at the same height as the GX-60 and the noise goes away. All of the wires that the GX-60 cable passes are the same in either case except, when it is connected to the front antenna, it crosses these wires at a 90 degree angle instead of running parallel to them when it goes the rear antenna connection. Like I said earlier, I switched the two antenna to see if one was bad with no change. I am using a ground block for all grounding as suggested by Bob and the battery is attached to it. This also occurred out of the hangar so it isn't noise being generated outside of the airplane. Thank you all Ross From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Friday, July 17, 2015 7:30 AM Subject: Re: AeroElectric-List: Radio Buzz At 10:57 AM 7/16/2015, you wrote: 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. This sounds like a radiated noise issue which is almost never an issue with grounding or other installation errors . . . it's usually some device that is not designed to live in harmony on airplanes. Find a hand-held radio. Adjust to unused frequency and open the squelch so you can hear the background 'hiss'. Then use it to 'probe' about the various devices on the airplane. Hand-held vhf transceivers and 9v transistor am radios have been quite useful for probing noise sources of all stripe. Also, conduct a power-down study. Pull all fuses/breakers that power up the ship's accessories. If noise is gone, replace fuses one at a time until the noise comes back. Bob . . . ________________________________ Message 5 _____________________________________ Time: 09:07:24 AM PST US Subject: Re: AeroElectric-List: Radio Buzz From: Kelly McMullen Since you have ruled out external sources, it sort of points to the front antenna cable. I thought you said you had tried swapping cables. Try removing antenna from airframe, connecting it directly to radio and see if there is noise. I can't explain it, but I know of one case where noise was coming via ground, and isolating the antenna from ground cured the problem. Perhaps a ground loop between coax shield and the airframe ground. On 7/17/2015 7:51 AM, Ross Home wrote: > > I will try this. > > What is puzzling is that the antenna connection that leads to the rear > antenna is at the firewall about 18 inches and level with my GX-60. I > can easily unhook the GX-60 cable from the front antenna (which is > under the floor directly beneath the GX-60) and hook it to the rear > antenna connection which is at the same height as the GX-60 and the > noise goes away. All of the wires that the GX-60 cable passes are the > same in either case except, when it is connected to the front antenna, > it crosses these wires at a 90 degree angle instead of running > parallel to them when it goes the rear antenna connection. > > Like I said earlier, I switched the two antenna to see if one was bad > with no change. > > I am using a ground block for all grounding as suggested by Bob and > the battery is attached to it. > > This also occurred out of the hangar so it isnt noise being generated > outside of the airplane. > > Thank you all > > Ross > > *From:*owner-aeroelectric-list-server@matronics.com > [mailto:owner-aeroelectric-list-server@matronics.com] *On Behalf Of > *Robert L. Nuckolls, III > *Sent:* Friday, July 17, 2015 7:30 AM > *To:* aeroelectric-list@matronics.com > *Subject:* Re: AeroElectric-List: Radio Buzz > > At 10:57 AM 7/16/2015, you wrote: > > 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. > > > This sounds like a radiated noise issue which is almost > never an issue with grounding or other installation > errors . . . it's usually some device that is not > designed to live in harmony on airplanes. > > Find a hand-held radio. Adjust to unused frequency > and open the squelch so you can hear the background > 'hiss'. Then use it to 'probe' about the various > devices on the airplane. > > Hand-held vhf transceivers and 9v transistor am radios > have been quite useful for probing noise sources of > all stripe. > > Also, conduct a power-down study. Pull all fuses/breakers > that power up the ship's accessories. If noise is gone, > replace fuses one at a time until the noise comes back. > > > Bob . . . > > ** > ** > ** > ** > ** > ** > ** > *http://www.matronics.com/Navigator?AeroElectric-List* > ** > ** > *http://forums.matronics.com* > ** > ** > ** > ** > *http://www.matronics.com/contribution* > ** > ** > http://www.matronics.com/contribution ________________________________ Message 6 _____________________________________ Time: 11:04:02 AM PST US From: ARGOLDMAN@aol.com Subject: Re: AeroElectric-List: Radio Buzz Bob's idea is probably right, but with two basically identical antennas I would vote for a problem with the problem antenna, probably the coax- connector-or connection to the antenna or a faulty antenna, if it is store bought. Connect your portable to each antenna to re re re varify that the front antenna is indeed the one that is giving the problem. Then do a continuity check to see if somewhere the cable has been kinked and is intermittently shorting (move as much of it as you can around. If the noise is coming from inside of the aircraft, shutting all things off (with the exception of the errant radio and listening would probably be a good first test. If quiet, turn on each separate one (disconnect them via their fuses/CBs, not just their switches. If it is coming from the hanger, merely reverse the location of the aircraft and the problem may go to the other antenna. A better test is to take the beast out of the hanger and try to duplicate the problem. My vote is the antenna or its lead/connectors, etc. By the way. communication waves are vertically polarized your antennas are horizontally polarized. I dont know how much of a problem this is. That is for others to comment about Rich In a message dated 7/17/2015 9:34:07 A.M. Central Daylight Time, nuckolls.bob@aeroelectric.com writes: At 10:57 AM 7/16/2015, you wrote: 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_ (http://www.aircraftspruce.com/catalog/avpages/comant122.php) 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. This sounds like a radiated noise issue which is almost never an issue with grounding or other installation errors . . . it's usually some device that is not designed to live in harmony on airplanes. Find a hand-held radio. Adjust to unused frequency and open the squelch so you can hear the background 'hiss'. Then use it to 'probe' about the various devices on the airplane. Hand-held vhf transceivers and 9v transistor am radios have been quite useful for probing noise sources of all stripe. Also, conduct a power-down study. Pull all fuses/breakers that power up the ship's accessories. If noise is gone, replace fuses one at a time until the noise comes back. Bob . . . ________________________________ Message 7 _____________________________________ Time: 11:05:47 AM PST US From: ARGOLDMAN@aol.com Subject: Re: AeroElectric-List: Radio Buzz I just looked up your antenna-- forget the part of polarization in the last post..It is possible that you have an infant mortality. Rich In a message dated 7/17/2015 9:34:07 A.M. Central Daylight Time, nuckolls.bob@aeroelectric.com writes: At 10:57 AM 7/16/2015, you wrote: 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_ (http://www.aircraftspruce.com/catalog/avpages/comant122.php) 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. This sounds like a radiated noise issue which is almost never an issue with grounding or other installation errors . . . it's usually some device that is not designed to live in harmony on airplanes. Find a hand-held radio. Adjust to unused frequency and open the squelch so you can hear the background 'hiss'. Then use it to 'probe' about the various devices on the airplane. Hand-held vhf transceivers and 9v transistor am radios have been quite useful for probing noise sources of all stripe. Also, conduct a power-down study. Pull all fuses/breakers that power up the ship's accessories. If noise is gone, replace fuses one at a time until the noise comes back. Bob . . . ________________________________ Message 8 _____________________________________ Time: 11:46:47 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Radio Buzz At 11:05 AM 7/17/2015, you wrote: >Since you have ruled out external sources, it sort of points to the >front antenna cable. I thought you said you had tried swapping cables. >Try removing antenna from airframe, connecting it directly to radio >and see if there is noise. >I can't explain it, but I know of one case where noise was coming >via ground, and isolating the antenna from ground cured the problem. >Perhaps a ground loop between coax shield and the airframe ground. > >On 7/17/2015 7:51 AM, Ross Home wrote: >>I will try this. >> >>What is puzzling is that the antenna connection that leads to the >>rear antenna is at the firewall about 18 inches and level with my >>GX-60. I can easily unhook the GX-60 cable from the front antenna >>(which is under the floor directly beneath the GX-60) and hook it >>to the rear antenna connection which is at the same height as the >>GX-60 and the noise goes away. All of the wires that the GX-60 >>cable passes are the same in either case except, when it is >>connected to the front antenna, it crosses these wires at a 90 >>degree angle instead of running parallel to them when it goes the >>rear antenna connection. Routing of coax cables to antennas is NEVER a component of received noise . . . in the heavy iron we route coaxes where there is opportunity and room. The whole idea behind the industry standard practices for (1) limiting noise from antagonists, (2) improving resistance to noise by judicious design of potential victims and last (3) reducing risk of over-whelming propagation path (mounting an antenna under the cowl will probably pick up ignition noise). When a noise coming in through the receiver's antenna port is detected, placement of the coax isn't even a distant finisher in the quest for resolution. Assuming you have paid due diligence to standard practices for installing the two antennas then the fact that the forward-most antenna seems to be the key propagation port, then the noise source is most likely forward ON the aircraft. If it were off the aircraft, both antennas would hear it. This problem has a lot in common with Col_Mustard- did-it-in-the-library-with-a-rope . . . you gotta gather all the clues available to you BEFORE picking up hammers-n-saws . . . or screwdrivers. Antennas don't go BAD in a manner that makes one a source of noise while others are not. They either work good . . . or they don't . . . but they're never 'noisy'. Start with a 'cold' panel and bring up equipment one item at a time . . . then confirm your preliminary findings with a sniffer receiver. Only THEN will hammers, saws and screwdrivers contribute to resolution of the problem. Bob . . . ________________________________ Message 9 _____________________________________ Time: 12:45:38 PM PST US From: "Ross Home" Subject: RE: AeroElectric-List: Radio Buzz Thanks so much, Bob. I will do as you suggest when I get back out to the hangar. Just for my education. Since the location of the coax is not an issue, am I to understand that the interference I am experiencing is being picked up by the forward antenna itself? In surfing the web about comm antenna, I read about the importance of having good electrical bonding of the antenna to the aircraft ground. The electrical bonding of the antennas to the aircraft skin is best accomplished by direct metal-to metal contact of the antenna base to the aircraft skin. To accomplish this, the aircraft paint in the mounting area will need to be removed and the surface alodined to protect aluminum against corrosion. An alternate method for providing electrical bonding is through the mounting screws, which attach to a backing plate inside the aircraft skin. Remove any interior paint in the area where the backing plate is placed to assure a good ground. Coat this area with alodine to minimize corrosion. To test the electrical bonding of the blade to the aircraft, a reading of .003 ohms between the antenna base plate and ground should be achieved. I am using the second method and will have to check if my installation meets the .003 ohm test. If the front antenna does not meet this, would this cause a buzz or just degrade the performance of the antenna? Ross From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Friday, July 17, 2015 11:45 AM Subject: Re: AeroElectric-List: Radio Buzz At 11:05 AM 7/17/2015, you wrote: Since you have ruled out external sources, it sort of points to the front antenna cable. I thought you said you had tried swapping cables. Try removing antenna from airframe, connecting it directly to radio and see if there is noise. I can't explain it, but I know of one case where noise was coming via ground, and isolating the antenna from ground cured the problem. Perhaps a ground loop between coax shield and the airframe ground. On 7/17/2015 7:51 AM, Ross Home wrote: I will try this. What is puzzling is that the antenna connection that leads to the rear antenna is at the firewall about 18 inches and level with my GX-60. I can easily unhook the GX-60 cable from the front antenna (which is under the floor directly beneath the GX-60) and hook it to the rear antenna connection which is at the same height as the GX-60 and the noise goes away. All of the wires that the GX-60 cable passes are the same in either case except, when it is connected to the front antenna, it crosses these wires at a 90 degree angle instead of running parallel to them when it goes the rear antenna connection. Routing of coax cables to antennas is NEVER a component of received noise . . . in the heavy iron we route coaxes where there is opportunity and room. The whole idea behind the industry standard practices for (1) limiting noise from antagonists, (2) improving resistance to noise by judicious design of potential victims and last (3) reducing risk of over-whelming propagation path (mounting an antenna under the cowl will probably pick up ignition noise). When a noise coming in through the receiver's antenna port is detected, placement of the coax isn't even a distant finisher in the quest for resolution. Assuming you have paid due diligence to standard practices for installing the two antennas then the fact that the forward-most antenna seems to be the key propagation port, then the noise source is most likely forward ON the aircraft. If it were off the aircraft, both antennas would hear it. This problem has a lot in common with Col_Mustard- did-it-in-the-library-with-a-rope . . . you gotta gather all the clues available to you BEFORE picking up hammers-n-saws . . . or screwdrivers. Antennas don't go BAD in a manner that makes one a source of noise while others are not. They either work good . . . or they don't . . . but they're never 'noisy'. Start with a 'cold' panel and bring up equipment one item at a time . . . then confirm your preliminary findings with a sniffer receiver. Only THEN will hammers, saws and screwdrivers contribute to resolution of the problem. Bob . . . http://www.matronics.com/Navigator?AeroElectric-List http://www.matronics.com/contribution ________________________________ Message 10 ____________________________________ Time: 01:50:14 PM PST US Subject: AeroElectric-List: Re: Young Aviators & B-25 intercom From: "jrevens" With a tremendous amount of work by the EAA Mile High Chapter 43 Young Aviators group, and many volunteers, the mock-up of a B-25 cockpit will be at KidVenture/Oshkosh this year. I want to thank Bob Nuckolls for the part he played in generously donating parts & his expertise to the intercom part of this tremendous undertaking. Thank you again, Bob!!! It is still somewhat a work in progress, but it looks very good, and a large group of the kids & their parents, as well as other Chapter 43 volunteers will be there to conduct tours and tell the B-25 story. They are a pretty excited and proud bunch of young people! -------- John Evens Thorp T-18 N71JE (built & flying) Kitfox SS7 N27JE (building) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=444883#444883 ________________________________ Message 11 ____________________________________ Time: 01:59:17 PM PST US Subject: Re: AeroElectric-List: Re: Young Aviators & B-25 intercom From: Bill Well done John (both your work and the nod to Bob for his). Bill SF bay area do not archive On Fri, Jul 17, 2015 at 1:48 PM, jrevens wrote: > > With a tremendous amount of work by the EAA Mile High Chapter 43 Young > Aviators group, and many volunteers, the mock-up of a B-25 cockpit will be > at KidVenture/Oshkosh this year. I want to thank Bob Nuckolls for the part > he played in generously donating parts & his expertise to the intercom part > of this tremendous undertaking. Thank you again, Bob!!! > > It is still somewhat a work in progress, but it looks very good, and a > large group of the kids & their parents, as well as other Chapter 43 > volunteers will be there to conduct tours and tell the B-25 story. They are > a pretty excited and proud bunch of young people! > > -------- > John Evens > Thorp T-18 N71JE (built & flying) > Kitfox SS7 N27JE (building) > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=444883#444883 > > ________________________________ Message 12 ____________________________________ Time: 04:27:20 PM PST US Subject: AeroElectric-List: Voltage reducer From: Janet Amtmann This is not aircraft related (but I do have an RV6) but is electronic related. Many years ago I converted an old Porsche 356 from 6V to 12V. There were no 12V windshield wiper motors available so I had to use the original 6V wiper motor which drew about 5-10A. Speed was controlled with a rheostat, but adding another dropping resistor generated heat and made the speed control ineffective. Someone assembled a transistor circuit for me that dropped the 12V supply to a constant 6V (independent of current draw) and everything worked well. I am now restoring this car and this device became lost. Does anyone of you electronic experts (maybe Bob N) know of a circuit I can build or purchase a device that will give me the constant 6V at 5 or 10A? Jurgen Amtmann ________________________________ Message 13 ____________________________________ Time: 06:38:37 PM PST US Subject: AeroElectric-List: Shopping at AirVenture From: "Art Zemon" =0AFolks,=0A =0AI am building a BD-4C (4 place, high wing) and plan to buil d the electrical system between this AirVenture and the next. If you were i n my shoes, is there anything that you would buy at AirVenture this summer? Tools? Wire? Etc?=0A =0AMy impression of the fly-mart is not great. And I have not been bowled over by tremendous deals in past years, as I wandered hangars A-D. But maybe I just don't know what I'm looking for so I figured I would ask here.=0A =0AThanks,=0A -- Art Z.=0A =0A--[ http://CheerfulCu rmudgeon.com/ ]( http://CheerfulCurmudgeon.com/ )"If I am not for myself, w ho is for me? And if I am only for myself, what am I? And if not now, when? " Hillel ________________________________ Message 14 ____________________________________ Time: 07:23:55 PM PST US From: Kenneth Johnson Subject: Re: AeroElectric-List: Shopping at AirVenture Hi Art,You have to determine what you need for your airplane.=C2- Most ai rcraft supplies companies will give a 10% discount on major purchases.=C2 - Take your order to several places and see where you get the best deal. =C2- On Friday, July 17, 2015 8:37 PM, Art Zemon wrote: Folks,=C2-I am building a BD-4C (4 place, high wing) and plan to build t he electrical system between this AirVenture and the next. If you were in m y shoes, is there anything that you would buy at AirVenture this summer? To ols? Wire? Etc?=C2-My impression of the fly-mart is not great. And I have not been bowled over by tremendous deals in past years, as I wandered hang ars A-D. But maybe I just don't know what I'm looking for so I figured I wo uld ask here.=C2-Thanks,=C2- =C2- -- Art Z.=C2--- http://CheerfulCurmudgeon.com/ "If I am not for myself, who is for me? And if I am only for myself, what a m I? And if not now, when?" Hillel ________________________________ Message 15 ____________________________________ Time: 07:40:26 PM PST US Subject: Re: AeroElectric-List: Shopping at AirVenture From: C&K The only real electrical score I ever made at OSH was for a used tefzel wire stripper from one of the outside stalls. Non aviation strippers nick the wire when used on thin tefzel insulation. Ken On 17/07/2015 9:37 PM, Art Zemon wrote: > > Folks, > > I am building a BD-4C (4 place, high wing) and plan to build the > electrical system between this AirVenture and the next. If you were in > my shoes, is there anything that you would buy at AirVenture this > summer? Tools? Wire? Etc? > > My impression of the fly-mart is not great. And I have not been bowled > over by tremendous deals in past years, as I wandered hangars A-D. But > maybe I just don't know what I'm looking for so I figured I would ask > here. > > Thanks, > > -- Art Z. > > -- > http://CheerfulCurmudgeon.com/ > > /"If I am not for myself, who is for me? And if I am only for myself, > what am I? And if not now, when?" Hillel/ > > http://www.matronics.com/contribution ________________________________ Message 16 ____________________________________ Time: 07:58:47 PM PST US Subject: AeroElectric-List: Re: Voltage reducer From: "user9253" Search for PWM Motor Speed Controller. Maybe something like this will work: http://www.ebay.com/itm/9-60V-40A-DC-Motor-Speed-Control-PWM-HHO-RC-Controller-12V-24V-48V-1500W-MAX-/261421453931?pt=LH_DefaultDomain_0&hash=item3cddeed26b The rated capacity of some items from China are exaggerated, so get 2 or 3 times the expected load capacity. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=444901#444901 ________________________________ Message 17 ____________________________________ Time: 09:17:41 PM PST US From: A R Goldman Subject: Re: AeroElectric-List: Shopping at AirVenture Art The fly market,over the last sever years, with few exceptions can really be c alled the flam market. If your electrical installation is anything other than real basic get a good quality automatic wire stripper (grabs the wire and strips it) make sure it is for tefzel wire. Standard strippers that look the same will not cut the t efzel smoothly--or at all They are not cheap. I got mine from pegasus racing (a rv builder) comes with a replacement set of cutters The other thing you will need is a good ratchet type crimper for terminals Additionally if you are going to use sub-d plugs get a crimped for the pins/ sockets B&c might be a one stop shop for you and will be located in one of the main b ooths For your terminals use PIDG. And don't use hardware store types If you can find a good used ratchet type terminal crimper that would probabl y be ok as they don't wear much but I would stay away from a used stripper a nd sub-d crimpr. Use machined pins Other things to get are heat shrink tubing of various sizes See what they have for wire marking Be careful about the wire that is being offered Make sure it is tefzel. Lots of places try to sell old stocks of obsolete w ire Just some thoughts Rich Sent from my iPhone > On Jul 17, 2015, at 8:37 PM, Art Zemon wrote: > > Folks, > > I am building a BD-4C (4 place, high wing) and plan to build the electrica l system between this AirVenture and the next. If you were in my shoes, is t here anything that you would buy at AirVenture this summer? Tools? Wire? Etc ? > > My impression of the fly-mart is not great. And I have not been bowled ove r by tremendous deals in past years, as I wandered hangars A-D. But maybe I j ust don't know what I'm looking for so I figured I would ask here. > > Thanks, > -- Art Z. > > -- > http://CheerfulCurmudgeon.com/ > > "If I am not for myself, who is for me? And if I am only for myself, what a m I? And if not now, when?" Hillel > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > ------------------------------------------------------------------------------------- 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.