VIC-3 whistling noise with Engine rpm

engele

Member
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Location
Nagold / Germany
Hi,
i have a VIC-3 full station in my Humvee.
i have a whistling Noise in my headset depending the rpm of the Engine.
only in Live, VOX or PTT if the PTT is on.

anyone have the Same issue? I think its Not normal.
greetings
 

milradioman

Member
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8
Location
Kooskia, Idaho
Sounds like alternator whine, which may be a defective alternator, (bad diode?) it may charge ok, but still cause the whine.
Where is the power connected?
Check grounding location(s)
You could install a filter, but better to eliminate the source of the interference.
 

US6x4

Well-known member
Steel Soldiers Supporter
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Wenatchee, WA
I have that same sound in my M813's VIC-1; kinda sounds like the truck has a turbo. Would a filter simply wire inline with the positive cable for the 1780 amplifier?
 

Augi

Member
277
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18
Location
SF Bay Area
Try improving the grounding. I ran a big flat ground braid from one of the feet of the main control box back to the battery and it reduced the whine significantly.

Augi
 

Augi

Member
277
19
18
Location
SF Bay Area
I'm talking about the CD-82 for the VIC-3. You can try the same with the AM-1780. Remove the paint where you attach the ground strap.

Augi
 

US6x4

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Wenatchee, WA
That would help a lot since, after looking back, my 1780 has rubber spacers between it and its panel...
20190509_164313.jpg
 

86humv

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Steel Soldiers Supporter
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I've tested the vic-3 on a bench power supply...and had a whine when only positive and negative were hooked up...then I grounded the main control box to the chassis ground wing nut on bench supply....no more whine.
 
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