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MFJ259 conversion help
On 12/6/2013 6:30 AM, John S wrote:
On 12/6/2013 1:52 AM, Jeff wrote: Maybe I am missing something,and I don't have a MFJ259, but I assume that the resistance reading is not a true resistance reading but Mod Z. So any reactive part of the load will contribute to the reading. So when used with a real antenna I am not sure why you would need such an accurate readout, because Mod Z can have a resistive part that is well away from the 'Resistance' reading on the meter. 73 Jeff You are correct, Jeff. However, the exercise is to help him with constructing an equation which relates his data points. It is his decision to use the info or not. I'm not trying to be nasty. I have just put blinder on myself to answer only his direct question without offering better solutions (as if I had any). At a freq of 100 MHz I measured a 100 ohm resistor R = 100 SWR = 1.9 Then a 100 in series with 30pf (Xc=53 ohms) R = 85 SWR = 2.4 Then 100 ohms in parallel with 30pf R = 25 SWR = 6 This is not what I expected, so I've learned something. I have equipment to measure up to 10 MHz, and I can measure Q up to 50MHz. I was hoping to use the MFJ259 to do something at higher frequencies. I don't think this is the direction I should be looking. Thanks for all your help, Mikek |
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