4db Attenuator to take 10w in and convert to 4w out
Objective:
I have a Kenwood TS-700SP that produces 10w of power that is not adjustable. I have a VHF amplifier that wants 1-4w in to produce 80w-120w out.
A simple coax attenuator would work but it would attenuate the transmit power and the receive. Since attenuating the received signal is not want anyone wants, I needed a way to attenuate the transmit power but not the received signal.
Tom Morgan, K4VCM, gave me the idea of installing the attenuator inside the amplifier. With the attenuator installed in the amp, between the relays, it would accomplish the attenuation during transmission but not while receiving.
I used a Pi attenuator calculator to give me the values of the resistors that I needed. Then I used a magic marker to draw the circuit onto a PCB then acid etched the PCB to eat way all of the copper except where the magic marker was.
I have a Kenwood TS-700SP that produces 10w of power that is not adjustable. I have a VHF amplifier that wants 1-4w in to produce 80w-120w out.
A simple coax attenuator would work but it would attenuate the transmit power and the receive. Since attenuating the received signal is not want anyone wants, I needed a way to attenuate the transmit power but not the received signal.
Tom Morgan, K4VCM, gave me the idea of installing the attenuator inside the amplifier. With the attenuator installed in the amp, between the relays, it would accomplish the attenuation during transmission but not while receiving.
I used a Pi attenuator calculator to give me the values of the resistors that I needed. Then I used a magic marker to draw the circuit onto a PCB then acid etched the PCB to eat way all of the copper except where the magic marker was.
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