I recently acquired a DSA815-TG which comes with a tracking generator option.
I currently don't have coax because I am in the process of ordering. So I decided to just use a thin 13 cm wire to connect my TG output (centre pin) to the RF input port (centre pin) and set the TG output power to -20 dBm.
I was subsequently horrified at what I saw with a sharp downwards peak after about 50 MHz which goes from -20 dBm to -30 dBm. The response seems to be correct up until 30 MHz.
I have attached two screenshots from the device with the TG directly connected to the RF input port using a wire.
You can see that the response is correct for 0-20 MHz.
Now my question is: Is this because I am not using coax or is this unit defective? The spec for output flatness reads ±3 dB.
Your help is greatly appreciated. I just want to make sure the unit is not defective.