Re: MFJ Drift Mods


From: John F. Woods (
Date: Sun Jan 15 1995 - 23:44:49 EST

> Best of all are the light tan cores
> (-7). They feature a plus 30 ppm tempco, although they are not as available
> as the -2 and -6 flavors.

-7 cores are white. I forget which number their light tan cores are, but
if I remember correctly, that's the core with essentially 0ppm tempco, and
permeability of 1: it's a bakelite toroid for winding VHF cores...

I buy most of my toroids from Amidon, who has 7s in stock. (Though they
had a minor bobble on my last order: they sent me 10 T44-7 cores instead
of T50-7. I called them up to arrange to send them back, and they said
just hang onto the wrong ones, they'll just send a batch of the right ones.
Unfortunately, they sent ANOTHER batch of 10 T44-7s... (Fortunately, they
have almost the same A-sub-L factor as T50s, so I figured it wasn't worth
complaining again.))

Search QRP-L Archives

[ QRP-L Archive | ]
[ 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 ]


This archive was generated by hypermail 2b29 on Fri Jun 02 2000 - 11:27:36 EDT