LF: RE: 137 kHz project......Handy cost-saving tip

["G4WGT - Gary" <g4wgt@talkgas.net>]

Hi Jim & LF,

 

I am using a core from a VGA computer monitor scanning coil yoke for the core in my LF antenna matching transformer wound with 2.5 mm mains wire with 10 turns primary & 20 turns secondary  (tapped every other turn from turn 10), for matching to the loading coil & antenna & seems to work ok .

 

73

 

Gary - G4WGT

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of James Moritz
Sent: 24 January 2004 00:40
To: rsgb_lf_group@blacksheep.org
Subject: LF: 137 kHz project......Handy cost-saving tip

Dear Dick, LF Group,

 

Thinking of cheap sources of ferrite, I have used the cores from old computer monitor line output transformers for some time for supression purposes - but the type of ferrite they are made from is very similar to the 3C8/3C85/3C90 grades often used on LF PA circuits.

 

 

Cheers, Jim Moritz

73 de M0BMU