|
|
Joined:
March 2002
Posts: 14842
Location: NJ | Yeah, the "tooth filling" thing was pretty common years ago (had a friend in school that used to intermittently pick up a local Spanish station). I think it had something to do with the inductive value of the filling material at the time and I think the formulas have changed over the years.
Bailey: ". . (hard to believe as sound requires a vibrating medium). . "
It's called a SKULL.
Gently rub you teeth together and notice how well you can "hear" relatively smooth, wet surfaces rubbing togther. Inch for inch, it's probably more efficient than an Ovation top/bowl. ;) |
|
| |
|
Joined:
December 2002
Posts: 13
Location: Pittsburgh, PA | Originally posted by BruDev:
My best guess as to where to install any RF filter is at the input to the preamp in the guitar (between the pickup and the preamp). A 100 uH coil in series with the hot lead with a 100 thru 250 pF capacitor to ground are fairly standard values.
I tried a ferrite bead RF choke, but to no avail. If I wanted to modify the wiring in the guitar, I'm not even sure how I would do that. As it stands, I can barely fit my hand through the sound hole to reach the wiring, so I'm not sure how I would be able to do this. Can the preamp (a DJ-4 in my case) be "popped out" of the side?
Mr. Ovation, Bailey: I have a call in to the station, but I can't conceive of them doing anything whatsoever about it, for two reasons. The first is that the guitar is the only device in my home or studio that is receiving this interference -- not my 802.11 network, not my phones, not my stereo, not my mic preamps, not my computers, not my other audio gear, not my POD-with-nothing-but-a-wire-plugged-in, nothing. The second is that this is Clear Channel Communications; I have a call in to them but am not holding my breath waiting for them to call me back.
I've searched the FCC website for interference info. The only applicable page that I seem to be able to find (here)
says it's usually the fault of poor design of the equipment being interfered with. (And I happen to agree with this assessment, since it's the only device I own that has this problem.)
I'm starting to think that the only solution I'm going to get to this problem is if I rip out the guitar's electronics and modify them myself (with more than just a ferrite bead), as suggested by BruDev. |
|
| |
|
Joined:
May 2002
Posts: 3005
Location: Las Cruces, NM | Well I guess if panic replaces correction, there is nothing we can do! |
|
| |
|
Joined:
December 2001
Posts: 7247
Location: The Great Pacific Northwest | "but I can't conceive of them doing anything whatsoever about it, for two reasons. " And the third reason they MIGHT do something about it is that they may be accidently violating a Federal Communications law due to faulty equipment, or (and actually worse) it may be a bleed being caused by a failed component in their transmitter, which your phonecall may end up saving them 1000's of dollars if it is caught before damage is done. If they do nothing, and it is an equipment fault, you'll get the last laugh. |
|
| |
|
Joined:
December 2002
Posts: 13
Location: Pittsburgh, PA | Well, I do have a call in to them.
Again, since this is the one single piece of equipment in my very-high-tech home that has a problem, the profoundly overwhelming probability is that the guitar is at fault.
Apparently, I'm the only one here who can conceive of the idea that an Ovation design might be poor and that it might not be the radio station's fault, so I guess I'll stop wasting everyone's time now. |
|
| |
|
Joined:
January 2003
Posts: 1498
Location: San Bernardino, California | 1) You might try putting some shielding inside the guitar under the bridge (the copper tape kind). You should be able to get some at an electronics store or guitar repair shop.
2) Another thing that I thought of is a bad connection on the pickup. That might the reason the problem only shows up when the strings are on. A bad connection can act as a diode when bombarded with RF.
3) The pickup might have a fracture. This could cause the pickup to resonate at radio frequencies (also affected by pressure).
4) If it is really related to the electrical resonance of the strings then a different brand of strings should CHANGE the resonance due to the use of different alloys by different manufacturers. NOTE: it might get worse.
5) Is the problem worse in different rooms of the house. Sometimes the length of the house wiring will add into all of this. Also different rooms tend to have different shielding. The kitchen and bathroom usually have the most robust wiring in a house. Item two can happen in the house wiring as well.
6) Problems of this kind tend to be caused by a combination a different factors. So, if one thing doesn't work you might have to use multiple corrective measures.
7) The FCC is notoriously under-funded, so don't hold your breath waiting to get an answer from them. |
|
| |
|
Joined:
October 2002
Posts: 56
| Try giving Ovation repair a call. Since nothing else in your house is picking up the FM signal, it seems that there is something wrong with the guitar. Send the guitar back to Ovation and ask them to swap the electronics.
You cannot possibly be the first Ovation owner to live near a powerful transmitter. If no one has ever reported this problem with their O before, then there must be something unique (read: screwy) about your guitar.
Have you considered brining another O into your house to see if it gets the same interference?
(This is definitely one of the most interesting discussions that I have ever seen on OFC.)
Alina |
|
| |
Radio interference on CK057
