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- Original Message - From: Don Kirk wd8...@gmail.com
To: topband topband@contesting.com
Sent: Saturday, August 23, 2014 10:48 PM
Subject: Topband: Bias Tee Measurements (Test Data)
Late last year Pete (N4ZR) reported problems with his home brew Bias Tee
that included radical shifts
Hi Tom,
I also just went and changed the RF load resistor to 200 ohms and checked
readings at various frequencies where the impedance was part reactive. I
also added a 3rd part to the test in which I physically removed
(disconnected) the DC power supply from the Bias Tee. All tests done using
Tom, you said Any test is meaningless, and I don't understand where you
are coming from on that statement. If you look at my test, I tested with
and without the bias Tee, and I tested with a well regulated bench top
linear power supply, and the results are similar so I don't see how you
can
Hi Tom,
Thanks for the clarification, and I don't disagree with your most recent
posting except I consider a well regulated supply to be one that has low
ripple, but that might be where you and I went astray on this posting
(sorry about that). My posting was not to tell folks that they should
Late last year Pete (N4ZR) reported problems with his home brew Bias Tee
that included radical shifts in measured impedance when DC voltage was
applied to his Bias Tee. Today I decided to make impedance measurements on
a simple Bias Tee circuit I recently proposed for Dwight (NS9I) who was
be a valid test if a moderately low resistance 200-500 uH RF choke
shunted the analyzer (receiver) port.
- Original Message -
From: Don Kirk wd8...@gmail.com
To: topband topband@contesting.com
Sent: Saturday, August 23, 2014 10:48 PM
Subject: Topband: Bias Tee Measurements (Test Data)
Late
