Ranger RCI-2995DX CF 10/12 Meter Radio

[Ranch55]

I have a brand new Ranger RCI-2995DX CF 10/12 Meter Radio that I purchased this year and have had in operation for about 8 months.
Recently I purchased a pair of Kenwood HS-5 headphones to use with this radio.
The problem is that I get a fairly loud cooling fan hum noise through the headset from the cooling fans on the back of the radio. If I unplug the fans from power, the hum goes away.
I have put some ferrite bead chokes on the fan power wire, but it did not help.
Any help from members here would be appreciated.

 

[sp5it]

Put 10nF cap across fan wires. Better to replace them with brushless fans.

 

[Ranch55]

Thanks for your input.
The 10nF (103) capacitor across the fan wires did not decrease the fan hum noise at all.
This RCI-2995DX-CF does already have two brushless fans. That was first thing I checked after seeing your suggestion.

 

[Dave239]

try running the fan of a separate power supply or battery and see what happens. that might help isolate the noise issue. just a suggestion is all

 

[boydjt]

I have a brand new Ranger RCI-2995DX CF 10/12 Meter Radio that I purchased this year and have had in operation for about 8 months.
Recently I purchased a pair of Kenwood HS-5 headphones to use with this radio.
The problem is that I get a fairly loud cooling fan hum noise through the headset from the cooling fans on the back of the radio. If I unplug the fans from power, the hum goes away.
I have put some ferrite bead chokes on the fan power wire, but it did not help.
Any help from members here would be appreciated.

I removed my cooling fans. I have a stock 2995. I run the power at around 50%. Heat sink never gets more than slightly warm to the touch.

 

[BBB]

I removed my cooling fans. I have a stock 2995. I run the power at around 50%. Heat sink never gets more than slightly warm to the touch.

I be interested in buying the fan set if you didn't need it any more. I have 2995 that the previous owner Ty-wrapped some computer fans to the heat sinks. I'm just trying to get it back to factory looking.

 

[boydjt]

I be interested in buying the fan set if you didn't need it any more. I have 2995 that the previous owner Ty-wrapped some computer fans to the heat sinks. I'm just trying to get it back to factory looking.

Thanks, but I will keep them in the box for the next owner.