Hi, all! Has anyone had any trouble with Phase Noise not passing the 8340 or the new Anritsu MG3693B at the 100kHz or 1MHz offset at 26GHz? The K-pros call for the max leveled power as +1dBm for the 8340 and +3dBM for the Anritsu. I have tried bumping the power on each of these; after that, we can get either of them to pass with the higher power.
All connections are snug and in the correct spot. The noise floor with the lower power is about 10dB higher than the noise floor with the higher power level.
Any suggestions will be welcomed. :-D
Three source comparison using two 8664A's (opt H15 I believe). Assuming you are using the E5504B system you should still have the 8664A's that were in before the E8257D w/ divider.
I know we have one 8664; not sure if we have the other but I don't think so. We have the 8257Ds in there now and have done a three-source comparison; no issues showing up with the system when we do so.
Thanks for the help.
Hi,
Our E5504A has the same problem. Our problem is in the 70427A Down Converter and only seems to appear at 26 GHz.
At first we tried new cabling. A very short 3. 5 mm cable allowed the TI's to pass for awhile. Now they will always fail at 26 GHz, 0 dBm, for 100 kHz offset and above, using Automatic Down Convertor settings.
Direct 26 GHz measurements using only the 70420A and a low noise 26 GHz source is one option to eliminate the Down Converter. It works but requires a generator we can not spare.
We still use the Down Converter. We found that over riding the Automatic settings for the Down Convertor works well. In the Down Convertor menu there are selections for IF Gain and Input Attenuation.
The 70427A can normally accept RF from -30 to +30 dBm. When the TI (DUT) 0 dBm signal is routed through the 70420A Interface, and cabling, a few dB are lost.
Our system actually losses about 3 dB so we have -3 dBm at the 70427A. Start by entering the Down Converter parameters. Set the Down Converter IF gain to 0 dB and Input Attenuation to 10 dB. Try a measurement. The system may not lock.
Increase the IF gain in 5 dB steps until you can get a measurement run. The 100 kHz offset may still fail. Increase the IF gain one more 5 dB step and all should be well.
I believe you do not want to exceed 20 dB of IF gain as the IF Power Output of the 70427A to the 70420A may become excessive, it should normally be between 0 and +5 dBm. Record the Input Attenuation and IF Gain settings for later use.
To see the 70427A manual goto hxxp: www. home. agilent. com/upload/cmc_upload/All/70427-90002. pdf take a look at page 2-2 for a block diagram.
Good Luck.
Thank you very much; I will try this tomorrow!