Home |
Search |
Today's Posts |
#19
|
|||
|
|||
FT200-2 RF Toroid RF Choke
"Richard Clark" wrote in message news On Thu, 11 Feb 2010 11:32:35 -0000, "Barett" wrote: I have managed to borrow a Rigexpert AA-200. Is it possible to measure the impedance with a AA-200 analyser and how would I do that? Hi Barett, Pass a single, short piece of wire through your core/bead. Connect it to the analyzer. Read the Z. This will be enough to characterize your ferrite material at any frequency within the range of the AA-200. Now pass the wire (now longer) through your core/bead twice. Connect it to the analyzer. Read the Z. You should observe four times the earlier reading (you may have to perform complex math if the Z contains substantial X). Now pass the wire (now longer) through your core/bead three times. Connect it to the analyzer. Read the Z. You should observe nine times the earlier reading (you may have to perform complex math if the Z contains substantial X). Ferrite materials with one pass of wire will not exhibit a huge value such as to lead to significant error, so as you progress through successive passes of wire, you can be reasonably assured that the square law will be observed within the capacity of the analyzer at low HF frequencies (simply because the wire length being a significant portion of a wavelength can confound measurements at higher frequencies). The single pass test will also help to select and compare previously known and unknown ferrite materials. 73's Richard Clark, KB7QHC Nice info how to use the AA-200. Thanks I read on the internet while reading through all the links that I should make sure when ordering the 2631803802 #31 that they have been coated with a hardener. Because a ferrite ring #31 that has not been treated with hardener will break easily because the material will be too brittle. I have been in touch with http://gb.mouser.com and http://uk.farnell.com and they both say that there Fair-rite ring 2631803802 #31 does not come treated with any hardener. How important is it that they should be treated with hardener and if not treated how easy are they to break? |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
toroid cores? | Homebrew | |||
How to design toroid? | Homebrew | |||
Toroid! Toroid! Toroid! | Antenna | |||
Toroid ID question... | Homebrew | |||
toroid combiner? | CB |