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Author Topic: Source for RF parts  (Read 3458 times)
JS6TMW
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Posts: 1255




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« on: July 24, 2015, 07:58:48 PM »

What is a good source for both toroid cores (T30-10) and mica capacitors? Mouser is difficult to find toroids on and Debco doesn't carry micas. I am not familiar with US sources but need to get hold of these parts while I am in the US. Thanks!
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AF6WL
Member

Posts: 224




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« Reply #1 on: July 24, 2015, 08:25:07 PM »

I've been getting mine here :
http://www.kitsandparts.com/
Fast efficient delivery.
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WD4HXG
Member

Posts: 377




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« Reply #2 on: July 25, 2015, 10:54:44 AM »

Lodestone Pacific is one possibility. They sell
Micrometals and other manufacturer's core
related products. Lodestone sells both
powdered iron and ferrites.

Do not overlook Palomar Engineers either.
For ferrites there is Fair-Rite. Many of their
products are referenced by part number
in amateur articles.

I try to buy from the manufacturer direct
when possible. There are rumblings that a
lot of toroids are being manufactured by
firms making knockoffs of Micrometal's
products with the copycat products being
inferior. I would recommend dealing with
known suppliers.

If a supplier does not have T30 size cores
in the -10 material consider asking for T25,
T27 or even T37 cores in the -10 powdered
iron. If Q pushes you into a corner and the
smaller core size will not allow you to realize
the needed Q the T37 is not all that much
larger.

Depending on how many cores you need
check out Micrometals' kits. They have
a couple of kits with assorted core sizes
and mixe. You may find what you want in
the kit and have a good assortment left over
for future projects.

If you find yourself looking for -12 material
take a peek at -17 material. It is more
stable over temperature and Micrometals
recommends it as the one to use. I suspect
they are discontinuing the -12 product.

Mica caps I would look on the internet and
identify the manufacturer's part you want
to use. Then check their website for their
distributors. Beware of new "old stock"
particularly if the caps will be used in a
transmitter circuit. I assume you are
seeking leaded components. If you are
ok with surface mount then try NPO caps
from good supplier such as Johanson or
ATC. yeah they cost but I learned in the
late 70's all NPO's are not created equal.
Their Q can be quite low and fall off
rapidly in the 30 MHz plus range. Still if
you want mica Mouser does have both
leaded and surface mount micas. If you
can locate them I have found feedthrus
in the 10 pf to 270 pf range to work well
in filters at 150 Mhz. I used them as shunts
in the filter and leaded micas between the
shunts.

73

Chuck WD4HXG
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WB6BYU
Member

Posts: 18455




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« Reply #3 on: July 25, 2015, 11:47:20 AM »

Dan's Small Parts and Kits carries both toroid core assortments and mica capacitors.
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W1BR
Member

Posts: 4188




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« Reply #4 on: July 25, 2015, 12:38:21 PM »

Dipped micas?  Justradios.com has them. http://www.justradios.com/mica.html


Also, check surplus vendors!  https://www.westfloridacomponents.com/MicaCapacitors.html  

EBay is another good source, but watch the prices!

Pete
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