[AMPS] Mount pi-net capacitors vertically

[i4jmy@iol.it (i4jmy@iol.it)]

In a frequency where the box ground path could be noticeable the large 
HF vaacum capacitor would be already out of matter because of their 
stray inductance.
Practically speaking, the output circuits at VHF/UHF are different than 
at HF and generally use cavities and resonant lines.
Capacitors are generally realized with flat plates and dielectric 
materials like Kapton or Teflon(thin foils). 

73
Mauri I4JMY
    


> ---------- Initial message -----------
> 
> From    : owner-amps@contesting.com
> To      : "jeff millar" <jeff@wa1hco.mv.com>, "AMPS" 
<amps@contesting.com>
> Cc      : 
> Date    : Fri, 15 Sep 2000 06:45:54 -0400
> Subject : Re: [AMPS] Mount pi-net capacitors vertically
> 
> 
> 
> Subject:              Re: [AMPS] Mount pi-net capacitors vertically
> Date sent:            Thu, 14 Sep 2000 22:04:06 -0700
> From:                 measures <2@vc.net>
> To:                   "jeff millar" <jeff@wa1hco.mv.com>, "AMPS" 
<amps@contesting.com>
> 
> > 
> > >
> > >I went to the site mentioned a few days ago with all the amp 
pictures,
> > >http://www.angenent.org/W7IUV/amp-pix.htm and noted that most of 
these
> > >put the vacuum variables horizontal with the tuning shafts 
straight out
> > >the front panel.  With all the talk about stray inductance and 
grounding,
> > >I'd like to ask why they all do this?
> > >
> > ?  Builders who use horiz. mounting apparently did not read the 
Jennings
> > catalog. 
> 
> From page 12 of the 1990 Jennings catalog:
> 
> Mounting Position- Units may be mounted in any position. When 
> large capacitors are mounted horizontally, both ends should be 
> supported to prevent excessive stresses (vertical mounting 
> preferred).
> 
> You can mount your capacitors in any position, as long as they 
> aren't the large capacitors. 
> 
> I asked Jennings about that several years ago and they said by 
> "large" they mean capacitors over 10 pounds weight. They are 
> worried about the bending moment on the front seal.   
> 
>  
> 73, Tom W8JI
> w8ji@contesting.com



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