Fan noise

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Fan noise

Postby wb4bsd » Mon Dec 12, 2005 5:41 am

I'm using a gm300 with a computer fan on the back of it. Everytime the radio keys up, the fan slows down due to the current draw and you can hear the fan noise over the radio. Is there a simple solution to filter this noise out? such as using some ferrite beads or something??
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Postby wb4bsd » Mon Dec 12, 2005 7:44 am

15 amp triplite.. should i get a bigger powersupply like a 30 amp or something??
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Power Supply Fan

Postby kp4tr » Sun Dec 18, 2005 8:45 am

I use a computer fan but the power supply comes from a separate 1 amp power supply I had from an old toshiba laptop. No issues here at all.

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Postby wb4bsd » Sun Dec 18, 2005 10:12 am

i use 2 fans. one on the power supply itself and one on the radio. seems that only one of them (radio) slows down though.. kinda odd. maybe i need to boost the wire size i am using to something a little bigger.
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Postby ve3nsv » Sun Dec 18, 2005 11:47 pm

wb4bsd wrote:i use 2 fans. one on the power supply itself and one on the radio. seems that only one of them (radio) slows down though.. kinda odd. maybe i need to boost the wire size i am using to something a little bigger.


Same here Rusty, one on the GE Pheonix and one on the Astron SL-11A and no fan noise either.

Are you using shielded audio cables?

Maybe try routing ALL power cables away from the audio cables.

Maybe the fan is on its way out and producing lots of noise while it dies a slow death?
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Postby wb4bsd » Mon Dec 19, 2005 8:33 pm

ve3nsv wrote:
wb4bsd wrote:i use 2 fans. one on the power supply itself and one on the radio. seems that only one of them (radio) slows down though.. kinda odd. maybe i need to boost the wire size i am using to something a little bigger.


Same here Rusty, one on the GE Pheonix and one on the Astron SL-11A and no fan noise either.

Are you using shielded audio cables?

Maybe try routing ALL power cables away from the audio cables.

Maybe the fan is on its way out and producing lots of noise while it dies a slow death?


All audio and power cables are separated. Now that have been thinking about it. I think i just need to get some bigger wire. I think the amp draw is just more than the current wire can handle and its causing the problems. The fan could be dying too. I might get a smaller one with the same CFM of air movement and see if that helps.

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Postby ve7ltd » Tue Jan 10, 2006 7:16 pm

[quote="wb4bsdi use 2 fans. one on the power supply itself and one on the radio. seems that only one of them (radio) slows down though.. kinda odd. maybe i need to boost the wire size i am using to something a little bigger.[/quote]

Power the fan from the computer power supply. That will solve your problem.

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Re: Fan noise

Postby G1LVN » Mon Jan 16, 2006 2:38 pm

wb4bsd wrote:I'm using a gm300 with a computer fan on the back of it. Everytime the radio keys up, the fan slows down due to the current draw and you can hear the fan noise over the radio. Is there a simple solution to filter this noise out? such as using some ferrite beads or something??


I used a DC fan for about a year. Could not get the hum off the audio, despite different PSU's grounding, even 600ohm isolating transformers on Audio RX and TX !!

The answer after 2 years of scratching my head was simple and cheap........


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.....Mains powered fan. Cost less than 20 bucks down the local Wall Mart (ASDA). Makes's one heck of a noise though even on position 1. On position 3 it chills a 25Watt Motorola PA heatsink (running 60 watts) constant KEYUP for 10mins to 7 Degrees C !!
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Postby mr.syntrx » Mon Jan 16, 2006 3:57 pm

Try putting a fat ass capacitor on that fan's power lines, to smooth the noise out a bit.
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