[TenTec] Audio Hum on Omni-VII

[KC7WV]

Bill, hello from Tucson!!

I had the exact same problem. I traded a buddy for his switching type a.c. power cube with a three-wire grounded a.c. line, as well as a three-wire d.c. output lead. It powers a Dell Inspiron 9400 laptop.

Call me if you need to - 520-825-9619 Tucson.

Don - KC7WV
  ----- Original Message ----- 
  From: Bill and Cindy 
  To: tentec at contesting.com 
  Sent: 09/17/2008 3:07 PM
  Subject: [TenTec] Audio Hum on Omni-VII


  I just got my new Omni-VII last week. It seems to be a great radio, the second radio in the
  shack is an Omni-VI+, so I knew what to expect......

  There is a hum on the audio. The Omni-VII is keyed from an old Compaq laptop running
  N1MM software, through an Array Solutions SO2R switch box. The hum COMPLETELY
  disappears when the AC/DC adapter power cord is pulled out of the laptop and the
  computer is on battery power. I don't remember this happening with the Omni VI+....

  Hmmm (no pun intended). Is this the AC/DC adapter going bad? The computer apparently
  takes 18.5 V at 2.7 A based on the listed output of the AC/DC adapter. What if I just
  power the laptop from the 13.8 V MFJ power strip that powers all the other accessories?
  Will this work?

  Thanks, Bill / KO7AA in Tucson


        
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