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Re: [Amps] Henry 2003 Filter for 20002A Amp

Subject: Re: [Amps] Henry 2003 Filter for 20002A Amp
Date: Tue, 10 Jul 2007 12:20:31 -0400 (EDT)
List-post: <>
If you send the filter to me I can tune it.  I'll do ya' better than a spectrum 
analyzer.  I have two Agilent 2 port network analyzers here in my lab at work.  
You pay shipping both ways, and I'll take care of it.  I have connector 
adapters for UHF, N, BNC, SMA and SMP.


Steve Fraasch, K0SF

----- Original Message -----
From: "Robert Bonner" <>
To: "Roger" <>,, "W0UN -- John 
Brosnahan" <>
Sent: Tuesday, July 10, 2007 10:43:26 AM (GMT-0600) America/Chicago
Subject: Re: [Amps] Henry 2003 Filter for 20002A Amp

I would think the tuning on this filter would require a spectrum analyzer or
other high tech devices to set properly.

I wouldn't touch it unless somebody has already been diddle sticking it.

The 3002 device is completely fixed components.

I'm having a bit of trouble following each reply as I've seen 2003, 2002,
3002, and 3003 referenced.

But having the actual name in one post brought it home.

The amps will run without the external filter if yours is screwed up.
You will have to get a hold of somebody with the equipment to re-tweak it
back in as it will require actually sweeping the thing and setting the
attenuation points. 

I've never done one and Henry doesn't have anybody working anymore.


-----Original Message-----
From: Roger [] 
Sent: Tuesday, July 10, 2007 9:31 AM
To:;; W0UN -- John Brosnahan
Subject: Re: [Amps] Henry 2003 Filter for 20002A Amp


This looks like a simple, inexpensive, and good remedy if needed.


Roger (K8RI)

> If you need to replace the Henry 3002 filter here is a good article
> on a harmonic filter design with reference to the original article.
> 'Stub Filters Revisited' by John Regnault, G4SWX, Radio Communication
> (RSGB), November 1994
> --John  W0UN

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