Amps
[Top] [All Lists]

Re: [Amps] FW: AMERITRON AL-1500 ????

To: "Michael Tope" <W4EF@dellroy.com>
Subject: Re: [Amps] FW: AMERITRON AL-1500 ????
From: R.Measures <r@somis.org>
Date: Sun, 7 Aug 2005 20:15:13 -0700
List-post: <mailto:amps@contesting.com>
On Aug 7, 2005, at 7:32 PM, Michael Tope wrote:

>
> ----- Original Message ----- From: "R.Measures" <r@somis.org>
>
>> Not quite, Joe, just lots of rotten splatter.
>> Few of us appreciate the current carrying ability of the 8877 grid.
>> For example, at it's rated f-max of 250MHz, with a 4kV PS, the 8877's
>> grid must be able to carry over 40 Amperes of current from the 10pF of
>> C to the anode.
>> (2670V-rms across 10pF @ 250MHz = 2670v / 65-ohms = 41.07A-rms)
>>>
>
> Rich,
>
> You are making an apples to oranges comparison. The issue isn't the
> current carrying capability of the 8877 grid, it is the power 
> dissipation
> of the grid.

The grid has ESR.  Current through R causes dissipation.

> A capacitor has a power factor of ~0.0.

Au has c. 60% of the conductance of Cu or Ag.   Just because the grid 
has C does that mean there is no P dissipation in the grid?

> ...

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>