I did not experience problems with exceeding the lower dynamic range of the Hermes-Lite. More often the missed spot is a JT9 signal, which has a narrower bandwidth and more stringent demands. The missed spot is not always the weakest signal. Rather, I see that one radio spots n and the other n-1. When one radio has a unique spot that the other misses, it is not because the other radio missed all spots within that minute. This suggests that the Hermes might benefit from additional gain on the higher frequencies. When the Hermes-Lite was run with only 12 dB gain, the Hermes did better. Here there was a clear advantage to the Hermes-Lite in terms of unique spots and SNR (average SNR of all common spots) when the Hermes-Lite was run at 20 dB gain (to match the fixed gain of the Hermes but not accounting for the different input transformers) or 28 dB. You can see that on 30M all radios were about the same, maybe with a slight edge to the Hermes-Lite on unique spot count. The results from the Hermes-Lite compare well with the Hermes and the RXTX. Finally, I let everything run for several hours to get a large sample set. The Hermes-Lite was also run with integrated gain set to ~20 dB unless noted otherwise. The Hermes was run with no attenuation and hence has 20 dB gain from the LTC6400-20. This explains some differences in the data. The Hermes-Lite has a 9-1 impedance transformer to better match the 400 Ohm input of the AD9866. The Hermes has a 4-1 impedance transformer.
#Jt65 transceiver software
The Hermes and Hermes-Lite were both using ghpsdr-alex software running on separate computers, and the RXTX was using Quisk. WSJT-X is not very sensitive to different input levels anyway. I adjusted audio levels to be similar for both copies of WSJT-X that I am running. This ensures that one radio is not spotting signals that are out of band for the other. I adjusted the radios so that common spots are within a few Hz. I connected two radios to the same antenna right at a tee so there is no additional coax for either radio. I compared the Hermes-Lite with a Hermes and a SoftRock RXTX Ensemble Transceiver at spotting JT65 and JT9 transmissions with WSJT-X software running on Linux.
#Jt65 transceiver code
Special care was taken in the creation of the network code for very low latency audio - ideal for general QSOs as well as time-sensitive modes such as FT8 and JT65. On rigs with built-in network interfaces (such as the IC-705, IC-7610, IC-7850, IC-R8600, and IC-9700), live audio streaming is available for both receive and transmit. Wfview provides the user with controls that may be comfortably operated from a keyboard, mouse, or touch screen interface.