[Amps] Amps Digest, Vol 94, Issue 53

[Mike Miller]

-----Original Message-----
From: amps-request at contesting.com
Sent: Tuesday, October 26, 2010 11:27 PM
To: amps at contesting.com
Subject: Amps Digest, Vol 94, Issue 53

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Today's Topics:

   1. Re: construct ferrite "line isolator" (Jeff Blaine)
   2. Re: construct ferrite "line isolator" (Bill, W6WRT)
   3. Re: construct ferrite "line isolator" (Jeff Blaine)
   4. Re: construct ferrite "line isolator" (Carl)
   5. Bird 4381 Power Analyst (donroden at hiwaay.net)
   6. Re: construct ferrite "line isolator" (Bill, W6WRT)
   7. Re: construct ferrite "line isolator" (Carl)
   8. Re: construct ferrite "line isolator" (Jim Brown)
   9. Re: construct ferrite "line isolator" (Jim Brown)
  10. Bird 4381 RF Power Analyst (Hal W5GHZ)


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Message: 1
Date: Tue, 26 Oct 2010 14:14:19 -0500
From: "Jeff Blaine" <keepwalking188 at yahoo.com>
Subject: Re: [Amps] construct ferrite "line isolator"
To: <dezrat1242 at yahoo.com>, <amps at contesting.com>
Message-ID: <74F449895EBC4E7BBB684D31D4E395BB at 8710w>
Content-Type: text/plain;	charset="iso-8859-1"

The mix is THE issue.  The permeability of the type 6 powder is microscopic by comparison to type 31 at low HF.  Get some type 31 
material and it will swat those RFI flys like they were nothing.

The next mistake guys make is not using big enough ones.  Larger sized units allow for multiple turns and so you get that 
exponential effect with each singular added turn.

The Fair-rite numbers for the type 31 mix are:

Solid core:        2631102002        this one is great for cables you make up in the shack.

Medium clamp on    0431164181

Large clamp on    0431176451

Huge clamp on    0431177081

There is a 2.4" x 0.5" round one that I use for the transmitting chokes and these are directly from Jim's article on the subject.

73, Jeff AC?C
www.ac0c.com
-----Original Message----- 
From: Bill, W6WRT
Sent: Tuesday, October 26, 2010 1:06 PM
To: amps at contesting.com
Subject: Re: [Amps] construct ferrite "line isolator"

ORIGINAL MESSAGE: