[Icom] 756ProII CW "Buzz"

Tue, 12 Feb 2002 10:22:43 -0700

Maybe this is too obivious, but I get "buzz" when I have bad QRN from my 
power lines and big signals on the band and the NB is on, or the adjustment 
is toward the high end of the scale.  I do not like the Noise Blanker in the 
rig, even with the adjustable blanker in the PROII.  I have had times when 
the buzz is worse with the NB on, versus it being off.  Try it with the NB 
on and off and see what happens and try to turn your antenna away from QRN 
sources if possible.  Without QRN I don't notice the problem that you 
mention.

73 & GL,
  Brian (N0VSB)

>From: "Jeffrey Steinman" <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: [Icom] 756ProII CW "Buzz"
>Date: Tue, 12 Feb 2002 10:12:56 -0600
>
>Hi All,
>
>I am a brand new 756ProII owner. Love the radio, but noticing some strange
>behavior on CW.
>I hear a "buzz" during RX on CW notes under certain radio settings 
>(outlined
>below). It's a pretty raspy buzz, at that. If I add in some attenuation 
>(say
>6 dB) it tends to take the rasp out. I don't notice any such 
>buzz/distortion
>on SSB. I thought it might be some type of mixing in the front end but 
>ruled
>that out when I heard the buzz on a lonely VK on 10M CW late at night.
>
>ICOM is being very helpful, saying to send the radio in for them to 
>inspect.
>Before I do that I thought I might see if anyone else has noticed this
>problem.
>
>73,
>
>Jeff Steinman, N5TJ
>
>***********
>The radio is set as follows:
>Mode: CW
>Filter BW: most noticeable from ~ 900 Hz to 1400 Hz
>Filter shape: Soft
>Sidetone: Very low pitch, 300-350 Hz (if I turn to a higher pitch the rasp
>is less noticeable/gone. Interesting that when rotating the pitch control I
>hear a similar type of noise/distortion)
>Band: Any
>Signal Strength: Most noticeable above S5
>Preamp: Irrelevant (hear it off/on)
>Audio: Heard through headphone jack and/or speaker jack. Seems more
>prevalent at lower volume (or could just be harder to detect at higher
>volume).
>Noise Blanker: OFF
>
>
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