Hello Wunder,
What is a typical input impedance for modern receivers, or specifically Elecraft receivers? I’m asking because antenna tuners are a frequent question on an SWL group I follow and I’m pretty sure that they are not needed for most situations. If the receiver input impedance is not 50 Ω, that is a big data point. My belief is that receivers are generally medium or high impedance, depending on whether the first RF preamp is bipolar or FET, but either way, mostly voltage-oriented. And, yes, I know that antenna tuners can be a LPF or HPF, depending on their configuration.
You ask for the receiver impedance, not the tramsmitter impedance. I didn't know the answer. But I always assumed that it wasn't 50 ohms. Therefore, I measured the impedance.
Meter: Vector Antenna Analyzer FA-VA5 <https://www.box73.de/product_info.php?products_id=4019> Output Power: 5.6 dBm (S9+78.6 dB) Impedanz: 50 ohms Frequency: 7030 kHz Object under test: Elecraft KX3 Conditions: ATU BYP, FREQ 7030 kHz, PRE OFF, ATT OFF Measured data: Z = 76.0 ohms + j 9.0 ohms Magnitude Z = 76,5 ohms, L = 204 nH SWR = 1.56 73/72 de Ingo, DK3RED - Don't forget: the fun is the power! www.qrp4fun.de - dk3...@qrp4fun.de ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
