| Author |
Message |
    
Kend
New member
Username: Kend
Post Number: 1
Registered: 8-2014
| | Posted on Wednesday, August 13, 2014 - 7:13 pm: | 
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I have an RHF-618 that recently developed an electrical type noise in the audio. Almost sounds like a bad power supply. I have switched the radio from AC to DC power and no change. I tried different mics as well. Any idea what could cause this or where I should start looking? |
Tech237
Moderator
Username: Tech237
Post Number: 1811
Registered: 4-2004
| | Posted on Thursday, August 14, 2014 - 11:03 am: |
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When you say like a bad supply are you meaning a hum?? Most people call this a 60Hz hum, but it's actually 120Hz.
Can you describe the noise better?
What happens if you disconnect the antenna?? Does the noise disappear?
When you say DC due you mean to a battery or a different type of supply (not sure if you mean the radio has an inbuilt one or not, as I don't know the radio itself).
Most noises are caused by either bad grounds, leaking coax or capacitors in the radio going bad.
Tech237
N7AUS
God made me an athiest, who are you to question his wisdom?
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Dale
Senior Member
Username: Dale
Post Number: 2106
Registered: 12-2002
| | Posted on Thursday, August 14, 2014 - 4:23 pm: |
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tech 237 this is rangers new base radio .has a built in powersupply.hope this helps. ive never had
issues with audio that couldnt be fixed by tring
different mics.kend you are talking about your modulation when you talk?
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
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Tech237
Moderator
Username: Tech237
Post Number: 1812
Registered: 4-2004
| | Posted on Sunday, August 17, 2014 - 12:12 pm: |
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Mics will very rarely cause a noise that "sounds like power supply hum" unless there is a grounding issue. If there is it could be just about ANY bypass capacitor in the radio.
OK, same DC supply, same antenna different radio, due you still hear the noise?
I'm suspecting the noise is coming form somewhere external to the radio, but trying to pin it down.
Kend - any chance you can email me a MP3 file of the npoise, it may help pin it.
Tech237
N7AUS
God made me an athiest, who are you to question his wisdom?
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