Power vs BNCs

[Scott Johnson]

In a 50ohm system, 2kW is roughly 6.4A@ 312V, a Teflon BNC with low 
dielectric loss would handle this at HF, although it probably wouldn't 
be my first choice!  Keep in mind the BNC has the same interface as the 
type N, the type N just has a big nut to stabilize the connection and 
keep it precisely aligned.  Lotsa Collins and other military gear uses 
BNC interconnects internal interconnects at close to this power level.

Scott, who tends to be contrary.

Alex [Temple Boatanchors] wrote:
> At 09:22 PM 7/25/2007, you wrote:
>> I have had, for several years, a very nice Waters 369A Reflectometer. 
>> It is
>> basically an SWR/power meter, with 2 vertical meters, with a switchable
>> maximum FWD Power scale of 200W or 2000W. The thing is: it uses BNC
>> connectors. Does anyone have any idea what the deal is? I am under the
>> impression that BNC connectors aren't capable of that much. Much less 
>> most
>> of the cables you would have BNC connectors on. I do understand there 
>> are
>> some TFE cables that would probably take it, but still it just seems
>> improbable.
>>
>> While I normally run a great deal less than 1KW, I DO have the 
>> capability,
>> and was thinking about using it since my old meters had an unfortunate
>> accident involving 1/4 inch of kitchen sink/garbage disposal/dishwasher
>> 'water' all over them for over a month while I was recovering (DEC 2005)
>> from heart surgery.
>>
>> Thoughts, comments???
>>
>> Ed Tanton
>
> Hi Ed,
>
> Maybe the meter uses a separate unit where the power sensors are 
> located, and where the "real" power has to go through. Perhaps the BNC 
> connectors are only used to connect both units together and only 
> carries the power sensing voltage. I really not familiar with the 
> reflectometer model you have, but I agree that it would not be 
> reasonable to pass 2KW through a BNC connector.
>
> 73s
> -Alex 
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