[Amps] Attenuator needed

[Larry Benko]

  Vic,

Be careful as the attenuators are rated for dissipation and not power 
input. Therefore a 50W 3dB attenuator is usable with a 100W input where 
a 50W 6dB attenuator is only usable with a 66.7W input.  Hopefully that 
works fine for you.  Also you might have duty cycle on your side 
depending on the mode of transmission you use.

73,
Larry, W0QE

On 11/15/2010 2:06 PM, Vic K2VCO wrote:
> Thanks! I just ordered the 6 db version. Lots of interesting stuff there.
>
> On 11/15/2010 12:54 PM, Jim Barber wrote:
>> Henry radio has been selling some Florida RF attenuators on fleaBay for
>> reasonable prices.
>>
>> http://cgi.ebay.com/New-50-Watt-Hybrid-30-dB-50-ohm-Attenuator-/390115387682?pt=LH_DefaultDomain_0&hash=item5ad4b06922
>>
>> If that URL doesn't work, find Henry Radio's eBay store and use the
>> search term attenuator in the in-store search box.
>>
>> I've bought several Florida RF parts from them recently and have been
>> happy with the transactions.
>>
>> 73,
>> Jim N7CXI
>>
>> On 11/15/2010 12:38 PM, Vic K2VCO wrote:
>>> I made a 6 db attenuator for the input of my grid-driven amplifier in order to bring the
>>> drive requirement up a bit and to provide a better SWR for the exciter during tuning. I
>>> used some film resistors from Mouser. I suspect that these have a low voltage rating,
>>> because one of them shorted after a few minutes of 10-meter operation. They didn't show
>>> any sign of heating, so I think it was a voltage/frequency issue and not simply overheating.
>>>
>>> Anyway, I need a 50-ohm attenuator that can dissipate about 40 watts and can be used at
>>> HF. Anything from 3 to 6 db will work. I had a Henry solid-state amp that had a couple of
>>> these, which bolted to the heat sink. Does anyone know where I can buy such a thing, or
>>> how to make one from reasonably priced parts?
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