[Kenwood] TS-480HX

Tue, 16 Mar 2004 13:08:30 -0800

Three sources of traditional alternator whine (is this the motor noise =
to which you refer?)

(1) Poor or inappropriate ground connection.  Best ground is at the =
battery terminals.   Other grounds can cause a "ground loop" where =
induced voltage due to current between the alternator and battery end up =
modulating the radio.
(2) Reliance on the antenna ground to power the radio (see #1)
(3) Need to install a choke and capacitor in the power lead.

Perhaps there are other issues in newer cars where computers and plastic =
structures are possible contributors.  I saw a motor carrier filled with =
new automobiles the other day.  All the hoods were fractured with =
numerous long cracks.  It looked like whatever composite material was =
used to make the hoods had become unstable.  Reminded me of potmetal =
failures in old 1920's-'30s radios.

73 de Bill, AB6MT
[email protected]

  ----- Original Message -----=20
  From: N4ULE=20
  To: [email protected]=20
  Sent: Tuesday, March 16, 2004 12:53 PM
  Subject: [Kenwood] TS-480HX

  Just installed a new TS-480HX in the car. Now I have a lot of motor =
noise. Does anyone have suggestions. The TS-480HX is a replacement for a =
FT-100D. The 100D had just a little noise on it but not like the 480.=20

  Jim  /  N4ULE

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