![]() The additional advantage of using a a relay in place of switching diodes is total absence from intermodulation and spurious products that diodes in the antenna lead are alwayst at risk of generating in presence of strong signals, even far removed from the receiver's frequency.ĭSC_1295.JPG (54.01 KiB) Viewed 43839 times Shorting antenna switch Switch 1.JPG (55.49 KiB) Viewed 44012 times The proposed antenna switch provides a minimum tested attenuation of 70 db between 900 KHz and 29 MHz: this means that, with a power of 1 kW nearby, our RSP receiver input will be equal to or less than -40 dBm. Therefore the switch must withstand a power of 1W and provide an attenuation of 40 dB or more. With a transmitter power of 1 kW (+60 dBm) and assuming a worst case transmit - to - receive antenna decoupling of 30 dB, we could end up with 1 W (+ 30 dBm) at the receive antenna terminals, which must be reduced by the antenna switch to less than 0 dBm, e.g. ![]() In my opinion a shorting relay is still the best possible antenna switch to be used to protect the RSP receiver input from local transmitted power. +10 dBm correspond to an RMS voltage of 0.707 V and to a peak-to-peak voltage of 2V. ![]() The RSP play specification for RF input is:Ġ dBm correspond to an RMS voltage of 0.223 V and to a peak-to-peak voltage of 0.632 V. SIMPLE AND RELIABLE RSP RECEIVER PROTECTION
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