PCS-Electronics

Hello, I drive the 300W fm amplifier with just 1w from the Max Pro 4+, but I have just bought the 600w pallet and I need a minimum of 6w of rf input and I can not reeach more than 4.5w from Max Pro 4+. What can I do?
The power supply can reach 15Vdc - 4Amps (14V adjusted), the power from the lcd lcd is at the maximum and the output is connected to a Daiwa CN-801 and a dummy load.

Regards

Where did you get MAX 4, it must be 6 years at least since we stopped selling those?

I got MAX PRO IV+ from PCS in 2005 I think. Also I bought SE4 DSP encoder and RDS MAX 2.0 and upgraded to 3.0.
If you have no support I understand. Thanks.

Hi,

I'd look at the two resistors setting the bias. There was one 2K2, if I remember correctly, close to output transistor. R37 at the board edge. If its 2K2 replace with 2K7 or 3K3.

I have replaced R37 with 3k3 and the output is about 5.5 watts now. I have also found the cd manual and I have compressed and expanded some coils reaching nearly 8 watts. This is enough to drive the pallet but I will have to use a fan because the Max Pro final transistor is running too hot.

Thanks for your help.

Sounds good. You could increase that resistor more, but why risk failure?

Consider upgrading to MAXPRO3000+, much better.