[Amps] Measuring RF Power

[Gary Schafer]

R. Measures wrote:
> 
> On Mar 23, 2005, at 9:52 AM, Gary Schafer wrote:
> 
>>
>>
>> R. Measures wrote:
>>
>>> On Mar 22, 2005, at 2:53 PM, Gary Schafer wrote:
>>>
>>>> When adding PEP to the mix it is vital that average power be understood
>>>> properly. Best to put RMS power out of mind as it is good for nothing
>>>> but confusion.
>>>>
>>>> Reading the FCC definition of PEP it goes something like:
>>>> Peak envelope power is the AVERAGE power in one RF cycle at the 
>>>> crest of
>>>> the modulation envelope.
>>>>
>>>> That means if you transmit a 1500 watt average power cw signal, your 
>>>> PEP
>>>> is also 1500 watts. If your peaks hit 1500 watts on voice your pep is
>>>> 1500 watts.
>>>>
>>>> Imagine the confusion trying to figure that out if you called the 1500
>>>> watt cw signal RMS power!
>>>
>>> How many watts of heat would a key-down 1500w RMS  CW signal produce 
>>> in a R?
>>
>>
>> If it were 1500 watts average power cw signal it would produce 1500 
>> watts heat in the R.
>>
>> I don't know what you would do with 1500 watts RMS.
> 
> 
> Calculate P by measuring the peak-V with a NBS traceable o'scope, square 
> E-pk, divide that by 2 x R and use it to calibrate a wattmeter.
> 

And that would give you average power to calibrate your watt meter at.

73
Gary  K4FMX

>>
>> 73
>> Gary  K4FMX
>>
>>>>
>>>> 73
>>>> Gary  K4FMX
>>>
>>
>>> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>>
>>
>>
>>
>>
>>
> 
> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
> 
> 
>