[Amps] Henry 2003 Filter for 20002A Amp

Tue Jul 10 12:20:31 EDT 2007

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.

73,

Steve Fraasch, K0SF
k0sf at arrl.net

----- Original Message -----
From: "Robert Bonner" <rbonner at qro.com>
To: "Roger" <sub1 at rogerhalstead.com>, amps at contesting.com, "W0UN -- John Brosnahan" <shr at swtexas.net>
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.
(DIDDLE STICKED)
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.

BOB DD

-----Original Message-----
From: Roger [mailto:sub1 at rogerhalstead.com] 
Sent: Tuesday, July 10, 2007 9:31 AM
To: rbonner at qro.com; amps at contesting.com; W0UN -- John Brosnahan
Subject: Re: [Amps] Henry 2003 Filter for 20002A Amp

Thanks,

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

73

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
> 
> http://www.ifwtech.co.uk/g3sek/swxfiltr/swxfiltr.htm
> 
> --John  W0UN
> 
>

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