[TenTec] Herc 2 LP Cap?

[Jim Brown]

The caps on this data sheet are rated for 50VDC or 500VDC. I see nothing 
that indicates they are designed to handle power.  Are these in the 
input circuit or the output circuit?

Data sheets for caps designed to handle significant current and will say 
so, and will talk about low ESR, or have graphs showing current ratings.

About a year ago, I bought 18 of this sort of cap to build W3NQN filters 
conservatively rated for 200W. I paid an average of about $4 for a wide 
range of values, some larger, some smaller, than 100 pF.  They came from 
a vendor in the UK, where Bob, 5B4AGN found them.

73, Jim K9YC

On 8/27/2013 11:31 AM, John Huffman wrote:
> Jim -
>
> That is the only information Ten Tec service gave me.  Here is the 
> data sheet -
> http://www.mouser.com/ds/2/188/XC-600144-198731.pdf
>
> I see no reference to ESR.  Ten Tec didn't say anything about ESR. How 
> would I tell the ESR of the capacitor?  How would I find the ESR of 
> the ones used by Ten Tec?  What would you do?
>
> 73 de K1ESE
> John
>
>
> On 8/27/2013 11:31 AM, Jim Brown wrote:
>> On 8/27/2013 6:06 AM, John Huffman wrote:
>>> I searched Mouser and found some discs at 100PF and 6KV. 
>>
>> I would not be at all confident that the caps you found will work. 
>> There is the issue of equivalent series resistance -- ESR -- which 
>> dissipates power if the cap is carrying current, which it certainly 
>> is.  I bought a bunch of HV caps without knowing this spec for them, 
>> and lived to regret it. Luckily they were in an antenna matching 
>> network where it was easy to see them smoking. :)
>>
>> 73, Jim K9YC
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