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RFC3 for SB-200

Feb 23rd 2016, 20:34

oldham

Joined: Mar 23rd 2013, 18:11
Total Topics: 0
Total Posts: 0
Can someone tell me where I can get a 1.1mh rf choke that replaces the on in the Heathkit SB-200? Part number would be great.. 1.1mh is all I can come up with as far as spacs.
Feb 23rd 2016, 21:43

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0

http://lists.contesting.com/_amps/2012-03/msg00306.html
According to this discussion, chokes in this application typically have current ratings between 100 and 300 mA.

Mouser has a similar part.
542-4652-RC 1mH RF choke that is the same as the old JW Miller design with a phenolic core.
If you can, it may be a good idea to check that it actually has a high impedance across the ham bands. Otherwise it may shunt too much current to ground and burn up. You may want to buy some extras unless you are sure you fixed the problem that caused the original to burn up.

Zack W1VT
ARRL Senior Lab Engineer

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