For the price, this is good value for money if you are specifically looking for a radio that can receive HD Radio signals. I also like that even though it is battery-powered, the external power supply is included in the box.
This radio also has some modes that aren't documented in the manual that make it VERY useful for test/engineering purposes.
This mode is used for calibrating the time-delay alignment at the transmitter site. Because of the interleaving, FEC, codec, buffering, and other processing delays in the digital audio path as compared to the instantaneous nature of the analog path, the digital path is delayed. It is thus necessary to delay the analog audio by a suitable amount at the transmitter so that as the reception varies, the radio can switch back and forth between analog and the digital simulcast seamlessly without any listener discomfort or annoyance. The NRSC-5 specification states that the difference between the analog FM audio and the HD1 digital audio simulcast shall not exceed 68 microseconds. This mode allows you to calibrate this by putting both signals on one output that you can record with a computer and then visualize the waveform (and relative delay) in an audio editor program
To enter split mode, press and hold MEMORY and HD SEEK (-) at the same time. After 3s, "CH:Normal" will appear on the screen. To toggle split-mode, press MEMORY again. "CH:L-HD R-FM" will appear on the screen.
RSSI, manual gain, CINR, SNR:
This mode has to do with measuring the strength and quality of the incoming signal and overriding the automatic gain control. This can help you fine-tune the antenna for tuning in radio stations that have a weak signal where you are located.
To enter this mode, press and hold MEMORY and HD SEEK (+) at the same time. After 3s, "m>XXX rssi:xx" will appear on the screen. To change the gain control, use PRESET (-)/(+) buttons. To see CINR/SNR, press MEMORY. "C:XXX Snr:xx" will appear on the screen.
PBlock, PBit, P3, P2, P1 packet counters:
This is used to verify that the radio is or is not receiving digital data from the transmitter, and if so, which programs it is receiving data for. This mode is likely most helpful for the people who wrote the firmware, but could also be helpful for tuning in weak stations.
To enter this mode, press and hold MEMORY and VOLUME (+) at the same time. After 3s, "PBlock:xxxxxxxxx\ntot:xxxxxxxxx" will appear on the screen. To cycle between PBlock, PBit, P3, P2, P1, press MEMORY. Total packet counter remains on the screen at all times.
Press and hold MEMORY and SOURCE at the same time. After 3s, "Restart ...." will appear on the screen. The device will clear all stored presets.
Exiting any of these menus to return to normal operation requires a soft power-cycle by holding down the power button. It is NOT necessary to remove the batteries or unplug the power supply.