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Title: Need Info On B & W Roller Inductor Post by: K4TAX on January 12, 2009, 10:15:29 AM I have two B & W # 3853 roller inductors. That's the only number on the units. They have 65 turns, coil length is 5.5" and diamerter is 1.875". Overall they are 3.75"H x 3.25"W x 9.0"L. The length includes the 1/4" shafts on each end.
On line calculators conclude the value is some 65 uH. Research your old data books or catalogue and see if you can find any data. A copy would be appreciated. I tried B & W but they report "too old, no data". Thanks 73, Bob, K4TAX Title: Re: Need Info On B & W Roller Inductor Post by: Joe Long on January 12, 2009, 10:22:23 AM 72uh h-3 3/4" x w-3 1/4" x L-8 1/2"
Title: Re: Need Info On B & W Roller Inductor Post by: Ed-VA3ES on January 12, 2009, 11:42:52 AM From an older B&W Catalog: Model 3853 - inductance: 72 uH. Will handle 750W CW, 1500W SSB. Based on calculations, will handle 375W AM.
Title: Re: Need Info On B & W Roller Inductor Post by: WA1GFZ on January 12, 2009, 11:57:51 AM A matched pair would make a nice balanced/balanced tuner.
Check Rick Measures site. Title: Re: Need Info On B & W Roller Inductor Post by: Steve - WB3HUZ on January 12, 2009, 03:26:24 PM Don't need a pair for a balanced tuner. One will do just fine. Save the extra bux for your antenna or rig.
Title: Re: Need Info On B & W Roller Inductor Post by: K4TAX on January 12, 2009, 09:44:41 PM Thanks to all that replied. Based on info supplied these would make an ideal combination for a truly balanced antenna tuner. Using a single variable cap as an L network and switching it between the input and output it should match any impecance between about 6 ohms and 6000 ohms, any band 160M - 10M and handle legal limit too.
I've the info from Rich Measures site. And Small Parts of Miami has the proper pullys and serpinine belts to correctly link them mechanically. Thanks. 73 Bob, K4TAX Title: Re: Need Info On B & W Roller Inductor Post by: N3DRB The Derb on January 12, 2009, 09:52:47 PM Bob,
my memory is not very good , but I think you were the OM in TN that I picked up the W4DEK homebrew transmitter from were you not? I went to see Don K4KYV after that. Had a great time. You were running that blue cased BCL TX at the time. That HB W4DEK TX got taken over by KB3AHE. It's at his place so it's safe. Title: Re: Need Info On B & W Roller Inductor Post by: K4TAX on January 12, 2009, 10:26:31 PM Yep, best I recall you did get the TX. Since then I've gone through a couple of other BC rigs. Get them, clean them, make them sound good and somebody comes along and wants them.
Hope all is going well with you. 73 Bob, K4TAX Title: Re: Need Info On B & W Roller Inductor Post by: WA1GFZ on January 13, 2009, 08:15:15 AM Those inductors might go down to 600 meters. I have a pair of 22 uh in my tuner and wish they were 30 uh each.
Only two things to adjust in this configuration. You could also series tune it if necessary. Title: Re: Need Info On B & W Roller Inductor Post by: w4bfs on January 13, 2009, 07:50:54 PM hello Bob ... looking forward to on-the-air qso .... I have enjoyed your DX 60 article and have nearly finished a Viking II screen mod'd rig ...73 ... John AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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