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Termination of unused RF output ports

Thread Summary

The user is experiencing low RF output levels (-5dBm) with the HMC510LP5/510LP5E VCO when using the RFout/2 output. The final answer suggests terminating unused RF output ports to resolve the issue. The accompanying answer requests more details on the setup and a photograph for further troubleshooting.
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Category: Hardware
Product Number: HMC510LP5/510LP5E, HMC510, HMC510

I am using a HMC510LP5/510LP5E VCO for an RF output of 4.5GHz. The VCO has three RF outputs namely RFout, RFout/2 and RFout/4. I want to take a RFout/2 output. While designing I have kept the unused RFout pin and RFout/4 pin OPEN. The datasheet says that the output level of the VCO should be between 8dBm to 14dBm. But I am getting a output level of -5dBm. Can anyone tell me the reason behind the low output level? Is it because I kept the unused RF output pins open? 

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