I have for sale a quantity of 8 large Fair-Rite type 31 mix clamp-on cores.   
These are the best available cores for conveniently making high performance 
common-mode chokes over the HF amateur bands.  Fair-Rite PN is 0431177081 and 
the Mouser PN is 623-0431177081.   I purchased these new from Mouser over the 
past few years.  Some have been used outside on temporary contest antennas, 
some used inside for noise suppression in shack and on appliances.   Some have 
not been used.   All are in perfect condition mechanically and electrically 
with at most some slight discoloration on the exterior plastic.  Closing down 
the station here, so no longer have a use for them.

Core OD is a little over 2 inches, ID is about 1 inch and length is about 1.7 
inches.  Can be used to easily make multi-turn chokes even on RG-8 sized coax.  
 Please see K9YC’s excellent tutorial on his website for extensive applications 
information and reference designs. 


The current low quantity Mouser price for these is $19.70 each.   Selling all 
eight for $120.  Your purchase includes secure packaging and USPS Priority Mail 
shipping to your USA address.  PayPal only, please.   If interested, please 
contact me directly via email:  craig (at) powersmith (dot) net.


 73  Craig  AC0DS








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