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Re: [Amps] Henry 2003 Filter for 2002A Amp

To: <>
Subject: Re: [Amps] Henry 2003 Filter for 2002A Amp
From: "Conrad G0RUZ" <>
Date: Tue, 10 Jul 2007 17:56:40 +0100
List-post: <>
There are some nice high power filter designs at the following link which I
believe are based upon G4SWX's work. These will handle a lot of power.

It is a good idea for a QRO VHF operator to use such a device these days.


Conrad G0RUZ

-----Original Message-----
From: [] On
Behalf Of Robert Bonner
Sent: 10 July 2007 16:43
To: 'Roger';; 'W0UN -- John Brosnahan'
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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