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#11
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In article , Jonathan
Goodish writes: I have a Cherokee with factory-installed wing tip strobes. I have an original (1977) King Silver Crown avionics package, including audio panel, KX170Bs, etc. I also have a Sigtronics panel-mount 4 place intercom that was installed at some point before I purchased the plane... I believe it is a SPA-400. Everything is fine, except that the wing tip strobes can be heard like a siren in the headsets. The siren sound is also occasionally transmitted over the radio when we make transmissions, because I have been told to "check my ELT" after making transmissions. Here are my observations: I had this problem and I fixed it by adding a capacitor across the 12 volt input at the high voltage power supply and placed a choke ahead of the input (nearer the battery). My power supply is in the tail and the cap/choke killed the high freq at the source. Chuck |
#12
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Whelen told you all that. Strange, they mark the case as "Not Field
Repairable" and then they let their techs violate their own rule. The FAA police would surely frown. Their lawyers would squirm quite a bit also. If you ever crash, have your family sue Whelen for $50 million because the plane obviously crashed because of their "negligence" in giving you "defective" repair information. My cut for this advice is only 30%... Mike Ron Rosenfeld wrote: On Wed, 27 Oct 2004 00:43:50 GMT, Jonathan Goodish wrote: Everything is fine, except that the wing tip strobes can be heard like a siren in the headsets. Sounds like a problem I have had with a Whelen power pack. Can you hear the sound at the power pack? I could. When I called Whelen, I was told that the problem was a bad capacitor. They told me which capacitor to replace. I replaced it and it worked fine for a few years, although the noise is just now starting to come back. The power pack, however, is riveted closed. So I had to drill out the rivets, replace the electrolytic capacitor, and put the box back together. Took about 10 minutes on the phone with Whelen tech support; 30 minutes of labor and a $2.30 capacitor. Needed some pop rivets, too, to put the box back together. Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) __________________________________________________ _____________________________ Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com The Worlds Uncensored News Source |
#13
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Jonathan Goodish writes:
Everything is fine, except that the wing tip strobes can be heard like a siren in the headsets. The siren sound is also occasionally transmitted over the radio when we make transmissions, because I have been told to "check my ELT" after making transmissions. Here are my observations: Has it always been that that way; or has it be getting worse? In either case, I'll add another. Clean and check the battery connections and any/all engine/alternator ground straps. BOTH ENDS. You typically have a ground lug that's connecting to a dissimilar metal; that's corrosion city. Why does it matter? Well, the battery is [also] a whopping big capacitor; you want low impedence connections to it. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#14
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On 28 Oct 2004 02:40:04 GMT, Mike Spera wrote:
Whelen told you all that. Strange, they mark the case as "Not Field Repairable" and then they let their techs violate their own rule. The FAA police would surely frown. Their lawyers would squirm quite a bit also. If you ever crash, have your family sue Whelen for $50 million because the plane obviously crashed because of their "negligence" in giving you "defective" repair information. My cut for this advice is only 30%... I will accord your advice a value equal to less than what I paid for it. Even in jest, it is an attitude that I find distasteful, although I can understand from where you are coming. The option for Whelen to repair the unit did not exist (due to its age), nor do I recall any such marking on the case. Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#15
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On 29 Oct 2004 22:31:42 GMT, Mike Spera wrote:
But, if Whelen won't do the repair and will still offer repair assistance, they are better than many outfits that just tell you to buy a new unit. Good to hear you were able to get it working. I don't know if the assistance was company policy or one technician trying to help out. There was no hemming and hawing, so I tend to believe it was company policy at that time. The repair was done about 7 or 8 years ago. At *that* time it was over 30 years old. During the past year or so I'm starting to hear a very faint "siren", but not anywhere as annoying as when I fixed it. Pretty good return on investment. Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#16
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In article ,
Jonathan Goodish wrote: Everything is fine, except that the wing tip strobes can be heard like a siren in the headsets. The siren sound is also occasionally transmitted over the radio when we make transmissions, because I have been told to "check my ELT" after making transmissions. Here are my observations: Thanks to everyone for your suggestions. I believe that I have located the main problem right now, which is a local ground at the intercom jacks in the front panel. The jacks were supposed to be installed using insulating washers, with a central ground. It looks like the avionics shop may have done it that way, but then someone replaced the insulating washers on some of the jacks (but not all of them) with huge lock washers at some point after the system was installed. After trying other suggestions, I decided to focus on the intercom system and pulled the jacks from the panel... the strobe noise (and every other noise) immediately disappeared when the local ground was broken. Now, I need to find somewhere to get insulating shoulder and flat washers, unless someone has another interim solution. Radio Shack doesn't carry that kind of stuff any more, and don't seem to be able to find any local retail electronics shops. Don't know whether Lowe's or Home Depot would carry stuff like that or not, but I doubt it. JKG |
#17
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Jonathan Goodish writes:
Now, I need to find somewhere to get insulating shoulder and flat washers, unless someone has another interim solution. Radio Shack doesn't carry that kind of stuff any more, and don't seem to be able to find any local retail electronics shops. Don't know whether Lowe's or Home Depot would carry stuff like that or not, but I doubt it. DigiKey 3069K-ND may be the right number. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#18
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In article ,
David Lesher wrote: Now, I need to find somewhere to get insulating shoulder and flat washers, unless someone has another interim solution. Radio Shack doesn't carry that kind of stuff any more, and don't seem to be able to find any local retail electronics shops. Don't know whether Lowe's or Home Depot would carry stuff like that or not, but I doubt it. DigiKey 3069K-ND may be the right number. Thanks, I believe that I can find the appropriate parts there. Only problem is, they're showing an end-of-November ship date. I can probably fabricate something for the interim if I end up ordering from them. JKG |
#19
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Jonathan Goodish wrote:
: Thanks, I believe that I can find the appropriate parts there. Only : problem is, they're showing an end-of-November ship date. I can : probably fabricate something for the interim if I end up ordering from : them. If you order new jacks from one of the aircraft supply houses they usually come with insulating washers. If the jacks are 10 years old you could proably use new ones anyway, as the springiness of the contacts is probably mostly gone. I ordered some from Chief aircraft and they were $5 or so for the jack, washers, nuts, etc. -- Aaron Coolidge |
#20
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In article ,
Jonathan Goodish wrote: Thanks to everyone for your suggestions. I believe that I have located the main problem right now, which is a local ground at the intercom jacks in the front panel. The jacks were supposed to be installed using insulating washers, with a central ground. It looks like the avionics It looks like I spoke too soon, maybe. After looking a the Sigtronics instructions again (pulled from their web site), it looks like they _do_ recommend a local ground for the headphone jacks, and a central ground for the mic jacks. Therefore, Sigtronics only supplied insulating washers for the mic jacks, and the headphone jacks were grounded locally as directed in the instructions. My question is, could this still be my problem? Should I go to the trouble of pulling the airplane apart and running the headphone ground back to a central point, or is something else most likely the culprit? Thanks, JKG |
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