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Conversion Loss Measurement

Question asked by Leyo on Apr 17, 2007
Latest reply on Apr 18, 2007 by Dr_joel
I have a  DUT that has the following characteristics. It takes Input frequency from 1805 to 1880 MHz (DCS1800 TX band) and converts to 1710 to 1785 MHz (DCS1800 Rx band). It has mixer and LO signal to do the conversion. Typical conversion loss is  around 86 dB. So, If I apply a 30 dBm signal  at 1865 Mhz a, the output is @ 1865-95 = 1770 Mhz at a level of 30-86 =-56 dBm.
The conventional way of measuring this is by using a signal generator and spectrum Analyzer.

I am trying to do this with VNA. Have PNA and Agilent 8753ES with me. I tried this  in the frequency offset mode  using R channel receiver and not working. Is it possible to measure 86 db loss in Freq offeset mode?
Please give your suggestions.