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July 12th 09, 09:43 AM
posted to rec.radio.shortwave
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receiver input impedance?
On Jul 11, 6:20*pm, "D. Peter Maus"
wrote: On 07/11/09 19:50, wrote: On Jul 10, 8:50 am, "D. Peter wrote: On 07/10/09 10:17, wrote: On Jul 9, 7:22 pm, D Peter * *wrote: On 7/9/09 20:43 , m II wrote: D Peter Maus wrote: On 7/9/09 19:52 , m II wrote: I've been wondering how feeding two receivers from the same antenna would affect performance. If the input impedance is as high as I think, there shouldn't be much of a drop. I'm trying to compare two receivers on the same signals without the use of an antenna pre-amp or some sort of active splitter. mike * * *Depends on the impedance. Most coaxial inputs are 50 ohms. Single wires can be much higher....over 300 ohms. * * *For simplicity let's consider 50 ohm coaxial input. Single wire high impedance inputs are more complex to isolate. * * *Connecting two receivers to the same antenna, if the antenna is simply split without isolation between the two inputs can cause the two receivers to interact. Tuning one can affect reception in the other. |
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