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Re: Hum in my transmit audio on my DV Dongle

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  • Allen
    Thank you Ed, for your input into my problem with the HUM on my DV Dongle. It was found that the Logitech ClearChat Pro USB headset microphone was defective
    Message 1 of 18 , Apr 29, 2011
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      Thank you Ed, for your input into my problem with the HUM on my DV Dongle. It was found that the Logitech ClearChat Pro USB headset microphone was defective and Logitech is sending me a replacement for the one that I have....

      Thanks for your help....
      Al, N8PPX, 73's



      --- In DVDongle@yahoogroups.com, "Woodrick, Ed" <ewoodrick@...> wrote:
      >
      > I’d be very careful building a homemade supply for the Dell laptop. I know that it isn’t just a 19VDC supply. There’s intelligence built into the supply. If you have the wrong size supply, the laptop knows about it. I’d recommend trying a 12V DC adapter such as Dell’s, Kensington, or Targus.
      > But be cognizant of just how much power the laptop needs. A 90W power supply translates into 7.5A+ at 12V. And since that is commonly charging the battery, it can be close to a continuous draw at times. A 10A ICS supply is barely adequate.
      >
      > But again, you might want to try the local microphone or another USB headset. Also look for any other sources of ground that the computer may be receiving. Do you have any radios plugged into it?
      >
      > It might be easier and safer (less likelihood of damaging laptop) if you were to try to filter the USB 5V voltage in the line to the headset. Get a USB extension cable, cut in middle and then install filtering between ground and +5.
      >
      > Ed WA4YIH
      >
      > From: DVDongle@yahoogroups.com [mailto:DVDongle@yahoogroups.com] On Behalf Of Allen Riek
      > Sent: Thursday, April 21, 2011 5:00 PM
      > To: DVDongle@yahoogroups.com
      > Subject: Re: [DVDongle] Hum in my transmit audio on my DV Dongle
      >
      >
      > Ed,
      >
      > Thank you for your reply, I am using a LOGITECH USB headset microphone. I have also tried adjusted the mic gain and that had no effect on the "HUM". I am begining to believe that the problem is poor filtering from the power supply. Dayton Hamvention is less that a month away and maybe I can pick up some parts to build a 19vdc power supply. What type of laptop computer do you run with your DV Dongle?
      >
      > Also
      >
      > Thank you for your reply.
      >
      > Al, N8PPX
      > 73's
      >
      > ________________________________
      > From: "Woodrick, Ed" <ewoodrick@...>
      > To: "DVDongle@yahoogroups.com" <DVDongle@yahoogroups.com>
      > Sent: Thu, April 21, 2011 11:38:11 AM
      > Subject: RE: [DVDongle] Hum in my transmit audio on my DV Dongle
      >
      >
      > What headset are you using? If you are using the built-in one, then you might try a USB headset or the other way around.
      >
      > Also, if you are using the on-board audio, is the mic gain raised really high?
      >
      > Ed WA4YIH
      >
      > From: DVDongle@yahoogroups.com [mailto:DVDongle@yahoogroups.com] On Behalf Of Allen
      > Sent: Thursday, April 21, 2011 12:05 AM
      > To: DVDongle@yahoogroups.com
      > Subject: [DVDongle] Hum in my transmit audio on my DV Dongle
      >
      >
      >
      > Using my laptop computer with my DV Dongle pluged into it I have been told that I have a "HUM" on my transmit audio. The hum goes away whenever I remove the transformer charging unit and run on battery power only. I would like to know if anyone also using any laptop computer has had this kind of a problem and if so have you found a fix or work around for it. My computer is a DELL with the DELL power supplied transformer. I have tried a second DELL power supply transformer and have the same problem. I have even replaced the battery pack and the problem still is still there. The DELL power supply transformer is a 100-240VAC @1.5amps to 19.9VDC @4.62amps. It appears to me that both of these power supplies are not being filtered very well which is allowing the "HUM" to be passed thru to my DV Dongle transmit audio. So are there any suggestions on what I should do without damageing my computer and power supply?
      >
      > N8PPX
      > 73's
      >
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