As you can see it has very flat frequency response up to 70 Mhz and beyond. In figure below, S21 graph showing gain of the PTRX-7300. Function of a panadapter is to replicate internal RF signal without disturbing RF signal path, so gain is expected to be around 0 dB and input impedance of the panadapter to be as high as possible compared to 50 Ohm. Other important parameter of a panadapter is transfer function, namely gain from probed RF signal path to the output port. When we look at S22 parameter which is connected to the PTRX-7300’s Port-2, showing also perfect matching up to 70 MHz and beyond. TX signal level is low enough (<500 mVpeak) to monitor with most SDR hardware. There is also low power TX signal going to Power Amplifier. Antenna RX signal reaches this point after passing through input filters and low noise amplifiers. Fortunately, IC-7300 has a connector on its PCB designated as J1431 where you can sample TX/RX signals. Designed CAD model and manufactured product are shown in Figure 1.īeside designing high performance amplifer, there is also need for proper connectorized access to RF signal path on IC-7300’s PCB. Active and passive components are from well-known vendors, such as Analog Devices, Texas Instruments, AVX, TE Connectivity, etc. Amplifier is designed with state of art components for ultra low distortion and low noise. There is no 3 dB loss as in the case of power splitting approach to sample the signal. Because circuit is just sniffing (not loading RF signal line), thanks to its high input impedance amplifier, it can not be sensed by the rig and has no adverse effect on normal operation. PTRX-7300 is utilizing active high impedance probing technique to sample bidirectional TX/RX signal line. Hereafter, y ou can use your favorite SDR with your IC-7300 by connecting it to standart 50 ohm output connector at the rear panel. Additionaly, external SDR can function as second independent receiver. With this extention, IC-7300 gains wideband real-time spectrum scope capability. Our unique panadapter solution PTRX-7300 enables you probe internal RF signal of IC-7300 without any degradation on signal quality.
#HOW TO INSTALL PANADAPTER ICOM 756 PRO II PROFESSIONAL#
After carefully inspecting IC-7300’s schematics, pcbs and mechanic, Radio Analog has designed true, innovative panadapter solution for IC-7300 with its professional RF Engineering team.
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