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Old 18-Oct-2020, 12:28 AM   #9
Retired A/V Tech
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,738
To check the RCA, you have to make some voltage measurements.

First you check the voltage coming out of the power inserter without the preamp connected:

Next, you check the voltage at the upper end of the coax without the preamp connected:

Then you check the voltage to the preamp with the preamp connected. This is a little more difficult, because you need access to the coax center conductor when the preamp is connected. I use a T-adapter:

Attached Images
File Type: jpg RCAPreampVoltage1.jpg (159.6 KB, 813 views)
File Type: jpg RCAPreampVoltage2.jpg (154.7 KB, 823 views)
File Type: jpg RCAPreampVload3.jpg (168.8 KB, 791 views)
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
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