Question about Vtech VT 9152 Cordless Phone (VT-9152)

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HUM When recording from a external call, we get only a strong hum (like a 60 Hz one). If recording from the headset, it works fine. What is the probable problem? PY1LL

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DSL line. Possible that filters are not plugged in. When DSL service is being used on your line, filters must be installed at every jack that is in use. The DSL signal can cause static/noise, squealing (similar to fax tones) and other issues on your line. (ex. Caller ID problems). In order to avoid having this issue, the service provider gives DSL filters to all customers when they sign up for service. These microfilters must be used because they allow your phones to work properly by blocking the high frequency DSL signals from being transmitted through the telephones. DSL filters should be plugged into EVERY phone jack that has a phone. If you are not using the filters provided by the telephone company, this will cause static/noise and possibly Caller ID issues on your phones that are plugged into jacks without filters. Please contact your service provider for filter information and proper installation. Interference: Other 2.4 GHz products. Other products that use the 2.4 GHz band can interfere with the use of this phone. Items include: Radio towers, pager towers, cell phones, other 2.4GHz cordless phones and 2.4 GHz intercoms or monitors. If any of these items are in the area, they can interfere with the performance of this phone; try relocating the phone. Other 5.8 GHz products. Other products that use the 5.8 GHz band such as home networking (wireless modems) other 5.8 GHz cordless products (phones etc.) can interfere with the use of this phone. Try relocating the phone. Interference from microwave. Microwaves work on the same frequencies as the 2.4 GHz phones. If the unit is on when the microwave is running, it is normal to experience static at that time. Do not plug this phone in the same outlet or near the microwave. Environmental. Normal radio operation. There may be places within your environment that a cordless phone will not work well. If the problem only occurs in certain areas of your environment, there is nothing wrong with the phone. Try channing channels. Surge protector or modem. Unplug modem or surge protector that is connected to the unit. Building structure limits range. Relocate telephone base near window when using telephone outside. Base unit located in basement or other low area. Relocate telephone base to higher location. The unit will get better reception if it is not located in a low area. Video displays, television sets and personal computers may cause interference. Video displays, television sets and personal computers can cause interference on this phone. Please relocate the phone to an AC outlet were there is no major appliance plugged in. If the base is near any of the above mentioned, locate the base to another room. Possible telephone line/service problem. Try using your equipment at a different location (i.e. friend or neighbors). If the unit functions properly in the new location, contact your local telephone company for assistance; additional charges to be incurred by customer may apply.

Posted on Feb 12, 2006

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2 Answers

How do I remove hum from my recording


Its Pretty simple
All you've to do is Download AUDACITY its a freeware Program
Then load the Sound file
And THERE Should be an option at top "EFFECTS"
Click that and Find
Noise Removal
Click Noise REMOVAL and there should be a button saying
"OBTAIN PROFILE"
Click that and Choose a fine starting of recording which Includes Noise
NOTICE
WHEN YOU'LL RECORD , LEAVE THE RECORDING ON SOMETIME SO IT CAN OBTAIN A NOISE PROFILE
Okay
So choose that part and then click
Obtain Profile Button
And then Choose the Whole song
and Go again to noise removal and BAM!
that's it

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Hum is a constant low-frequency buzz, usually at about 60 Hz or 120 Hz, which results from voltage differences between true "ground" (what you'd get shoving a copper pipe into the ground) and the electrical "ground" of your receiver's chassis When this voltage differential exists, it's called a "ground loop," and the hum it produces is darned annoying. You'll hear the hum mainly from the subwoofer because it's a low-frequency noise, you will need a ground loop insulator they are about $20 at any electronic store

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Probably the power amp chip has failed with a short to one of the power rails. This will cause hum and ultimately wreck your speaker. Take in for repair.

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By your description - I am assuming what you have is a hum and not a musical tone. 60 Hz hum is usually the result of bad ground connection on cables (either broken or not connected). Since you don't specify what source is selected or if it is across all sources, I'd start with the cabling. If there are record in/out connections, you might start there.

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Bought a TD 150 MkII that runs 100 ~ 240 volts 50 Hz. In my country we have 60 Hz. How to correct ?


It's simply a matter of if the transformer can take the 60 Hz. After that the supply passes via a large electrolytic capacitor which is there to take out the 50 Hz. Otherwise you get a hum, which is what happens when the large capacitor fails.
Though I can not be certain! It might just work with the 60 Hz without doing nothing. Though if you get a hum you might need to replace the big capacitor with one with a greater value than the one in. Say the one you have in is 2200uf at 50v, you would need to replace it with 4700uf or higher at the same voltage or higher. Of course the other problem might be getting a bigger capacitor in!

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Rita's Vintage Audio Repair is a Bob Carver Company & can repairs & updates Subs at a reasonable cost try calling them.

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Onkyo HT-SR800 buzzing noise present then vanishes


The hum a fluorescent light makes is the 50 or 60 Hz hum of the alternating current mains supply. Inside the light fitting is a choke which when less than perfect tends to hum. When the choke is loose internally or externally is when the hum becomes an annoying buzz.

When an audio system has a similar tone of buzzing or humming the source will invariably be the same AC mains but how it got in there is difficult to answer...

It could possibly be poor smoothing and regulation of the power supply or an accidental hum loop caused by careless design and/or poor grounding. It could be caused by being induced in the input by connecting leads that are too long and poorly positioned/screened or it could be caused by mismatch between different components causing a poor signal-to-noise-ratio.

I am not sure why it should come and go but the fact it does would indicate a power supply problem more than the other possible causes.

If the Onkyo system has it's own volume control and it is being used witha tv or similar, it is worth trying to imporove things by turning up the tv volume to near maximum and then controlling the volume with the system control.

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Actually the problem was caused by a bad 470uf cap, that was used to filter the powersupply for all the analog amps. Replaced the cap the unit works like new.

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60 Hz hum on recorded messages


The described problem is not a settings problem and is probably a internal malfunction. Try consulting Vtechs support center.

Jan 09, 2006 | Vtech VT 9152 Cordless Phone (VT-9152)

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