[Moon-net] Fwd: Advise on bifilar choke for 8877 filament

[Edward Cole]

Thanks everyone!

The consensus is it doesn't matter.  Some advised making separate 
chokes with bare wire; some said insulated is fine; some cautioned 
that the wire was able to carry the current (10amps - good 
point).  The original article (Eimac Service Newsletter AS-47 by 
BobSutherland - W6SAI) recommends making a bifilar coil of 10 turns 
No. 12 enameled wire 5/8-inch diameter close wound.  I think I will 
try making the coil using standard insulated house wire (solid conductor).

The RF assembly is coming along slowly, but hoping to be testing the 
amp in a couple weeks if my MGJ-269 is returned form repair.

73 Ed - KL7UW


>I'm winding coils for my 2m-8877 PA (classic-W6PO design) and am
>wondering if I might use insulated #12 solid copper wire in place of
>enameled #12?  I will have to buy a complete spool of the enameled
>wire mail-order if that is necessary.  It appears to me that
>insulation in the bifilar choke is for dc voltage so insulation would
>likely only shift the inductance some.  I can check that with a MFJ-269.
>
>So what's the opinion on this?
>The remaining coils are all #14 copper which can be found locally.
>
>*****************************************************
>73, Ed - KL7UW              BP40iq, 6m - 3cm
>144-EME: FT-847, mgf-1801, 4x-xp20, 185w
>http://www.kl7uw.com     AK VHF-Up Group
>NA Rep. for DUBUS: dubususa at hotmail.com
>*****************************************************
>
>
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