PTRX-7300MK2
WIDEBAND HF PANADAPTER FOR IC-7300MK2
The ICOM IC-7300MK2 has become a true benchmark in the HF transceiver world with its outstanding performance and modern features. Many of you in this community are likely proud owners and daily users of this excellent radio. However, despite its many strengths, the IC-7300MK2 still lacks a RF output for connecting external SDR receivers. This limitation forces many operators to search for workarounds or use separate SDR systems such as AirSpy, HackRF, RTL-SDR, or SDRplay, along with software like HDSDR, SDRuno, SDR# and GNURadio — often with compromised performance or added complexity. Building upon the success of the original PTRX-7300, we proudly introduce the PTRX-7300MK2 — our next-generation high-impedance signal probing solution specifically designed for the ICOM IC-7300MK2. Now you can enjoy full SDR functionality seamlessly integrated with your IC-7300MK2 without any modification to your radio.
For detailed installation manual, please click here.
The first batch of the production is about to be released soon for the purchase…
PTRX-7300MK2 utilizes an active high impedance current-feedback probing technique to probe bidirectional TX/RX signal line of IC-7300MK2 (J1431). Due to the high impedance nature of the unit, it doesn’t introduce any insertion loss. Therefore there are no adverse effects on the radio side in terms of signal quality. In this method, there isn’t any 3dB insertion loss as in power splitting approach to probe the signal. You can see the block diagram in Figure.1.
During the design phase, we first measured the dynamic range of the TX/RX line (J1431) of IC-7300MK2 in terms of both voltage and frequency. We extracted this information, used it to define the design specification of the unit, and finally developed the proof of concept designs with the help of SPICE simulations. In these simulations, we took into account both the signal integrity and amplification characteristics. With the help of DDS-based signal generator (30kHz to 120MHz, @980mVpp), we analyzed the signal quality both in time and frequency domain.
Our high impedance probe has been designed with components from reputable distributors, such as Digi-Key in order to maintain the highest level of component quality. One of the major observations during testing of the unit was to see that the input/output MCX connectors have a vital role to generate a signal which is free from distortion and attenuation.
PTRX-7300MK2 does not compromise external tuner functionality. That is, the schematics and the mechanical model have been designed for IC-7300MK2 external tuner opening, which means that you can still continue using your existing external tuner along with the unit.
The unit bypasses the external tuner cables to outside, so you keep the functionality of the external tuner signals. It requires 13.8V DC to operate. For this reason, we utilize the power rails from the external tuner cable to supply the unit without adding any external power source. It consumes up to 30mA from external tuner cable so it does not disturb your tuner operations.
VALIDATION PROCESS
As we mentioned before we applied variable test signals in order to simulate extreme conditions. IC-7300MK2 can operate within the frequency range of 30kHz – 74.8MHz (up to 500mVpp), but we conducted our tests for ranges varying from 30kHz to 120MHz (@980mVpp). We make sure that the unit has flat frequency response for this range. Our test also covers SSB and DRM demodulation on actual HF band conditions. Testing CAT control synchronization with SDR software has been done by OmniRig with HDSDR.
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