Sunday, 10 May 2020

Tripp-Lite IB2-P


What DOES this gadget do?  I have had it around for decades, likely 30 years.  Tonight I thought I would connect it up to the Siglent VNA and have a look at the frequency response.  I hope it has an attenuation of the HF bands as my testing about signal levels and grounding in the office/ham shack showed substantial RF emanating from the mains wiring.  I am hoping this device will "mute" some of the RF roaming around the office when I transmit.  

The test jig is simple.  Feed the signal from Port 1 on the VNA.  Connect the signal to ONE lead at a time on the Tripp-Lite referenced to the ground lug  and test the pass through characteristics.  First the "hot" lead side.

The usual precautions and setup were taken with the VNA and the test leads were used when the device was Pass Through Calibrated.  

The HOT leads first:  
RF Source connected to the PLUG side hot to Ground.  
RF Sence connected to the RECEPTACLE side, Neutral.

The sweep is from 100khz to 30 mHz.  More than 30db attenuation at roughtly 3 mHz, and increasing to 20 dB of attenuation at 30 mHz.  

Just out of curiosity, here is the sweep up to 150 mhz.  Always more than 20db of attenuation.  

The next thing to test is the NEUTRAL side of the device.  
RF Source connected to the NEUTRAL PLUG.  
RF Sense connected to the NEUTRAL RECEPTACLE


It looks like this would provide at least 20 db across the amateur radio HF and VHF spectrum.  

So I am going to install it BEFORE the big power bar under the bench.  

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