[HBR] 85 Kc Ifs at that watery place - wind your own

[B. Smith]

          Best bet is to acquire a Morris Coilmaster winder. I've 
attempted home brew winders using a friction coupling and was never 
satisfied with the results as my rubber drive settings eventually 
drifted on coils with a large turns count such as 700-800 or  larger but 
I will continue to play with it. BTW additional cams for the Coilmaster 
can be fabricated by shaping a fender washer and soldering on a quarter 
inch shaft coupling off of center.
Video of my Coilmaster:
http://k4che.com/Tempvideo/Morrisosc.mp4

  Random winding coils can be made using sewing machine bobbins as 
suggested by k5bcg.
http://www.qsl.net/k5bcq/COIL/COIL.html
          When using the plastic sewing machine bobbins you can remove 
the sides of two of the bobbins and tape the shafts together together to 
accommodate  more wire. The bobbins keep all the windings in one place 
as you random weave the wire back and forth.  A shaft on a electric 
screw driver can  turn the bobbin while you concentrate on weaving the wire.

BTW a handy turns counter can be made using a micro-switch and a $1 
dollar store calculator. Only the cheaper calculators can be modified.

http://k4che.com/Tempvideo/Digcounter.mp4

What is the mod to the calculator? That is the home work assignment.

Many thanks to N3FRQ for his generosity and transferring "stuff from his 
pile to my pile".

k4che




On 2/13/2015 9:02 AM, Bill Cromwell wrote:
> Hi Stan,
>
> We really can wind our own. There are several web pages describing 
> various ways to do it. Martin has pointed at the bugaboo. At low IF 
> frequencies such as 455 kc or even lower at 85 kc there are a lot of 
> turns of very fine wire. How much patience do you have?
>
> There *are* hams who have done it. I have unwound 455 kc cans 
> (counting turns) and then rewound for a different range. I didn't need 
> bifocals at the time and there were *NO* IF cans available for the 
> frequency I wanted. The IF transformers I wound pretty much worked but 
> it took a long time and a sore neck to complete.
>
> Martin mentioned the coil winder and if I was going to wind coils in 
> those frequency ranges again I would acquire one. There are plans on 
> the web to build your own.
>
> 73,
>
> Bill  KU8H
>
>
> On 02/13/2015 08:31 AM, Stan McIntosh wrote:
>> Just how much trouble are we asking for if we try to custom-wind a 
>> can for
>> a given frequency?  Sure, I know how to use a dip-meter, but a friend 
>> years
>> ago gave me a baggie full of unassembled IF cans... including empty 
>> bobbins
>> for the wire.
>>
>> Regards,
>> Stan
>> kd4bth
>> ______________________________________________________________
>>
>
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