Sangean HDT-1X
			 Versions 0.2 and 0.3


Important Problems

1. Severe intermod may occur on FM when transmitters are nearby.

2. AM response does not follow standard NRSC deemphasis and can sound shrill.

3. FM frequency response droops with an error of -3.3 dB at 15 kHz.

4. There is no way to disable the automatic stereo channel blend or the
high-frequency noise filter.

5. Loss of signal for more than a few seconds retunes HD-2 to HD-1.


Lesser Issues

1. The clock resets if power is removed.

2. The AM synchronous detector is not always in lock when the tuner unmutes,
occasionally loses lock during a selective fade, and will not lock to a weak
signal when the signal on the adjacent channel is strong.

3. The extended-info selection is lost when tuning to a new frequency. The
display reverts to regular info.

4. Extended-info parameters are not in most-used order.

5. It should not be necessary to press PRESET to recall a frequency. Any press
of a digit shorter than 2 seconds should call up the station. [0.2]

6. The distinction between a memory being empty (press 2 seconds to store) or
full (5 seconds to overwrite) is unnecessary. The memories will eventually all
fill. Just store the memory after 2 seconds, overwriting whatever's there, and
be done with it. [0.2]

7. Pressing the final 0 when entering AM frequencies isn't necessary since all
U.S. frequencies end in 0.

8. 0.1-MHz steps on FM slow automatic tuning and make manual tuning awkward.

9. When tuning manually, the tuner steps through multicast channels even when
not attempting to lock to HD. This slows tuning and upsets the two-push
cadence necessitated by 0.1-MHz tuning steps.

10. SSI always indicates maximum except for weak signals.

11. The clock is not synchronized with the line frequency. Eventually the time
becomes inaccurate.

12. AM tracking was off as much as 85 kHz with 11 dB loss. After alignment
tracking loss was as much as 4 dB greater than for the HDT-1.

13. The tuner does not retain the last station tuned when power is removed.

14. When power is restored, the tuner comes up in standby. This makes it
impossible to power up an entire stereo system with a single switch.

15. The polarized power plug does not fit the unpolarized AC outlets on older
stereo equipment.

16. Reset may be required to prevent unnecessary blend to mono.

17. The frequency scan rate is slow.

18. Forced analog and forced mono are not saved for individual memory presets.

19. Although probably not audible, FM stereo distortion is rather high.

20. Split-audio mode uses the left source channel instead of left plus right.

21. The output level in split-audio mode is 8 dB too high.

22. A weak heterodyne due to SPDIF is audible on some AM frequencies.

23. The LCD font is rather primitive (e.g., raised descenders).

24. Intermod occurs on AM with nearby transmitters, mostly noticeable between
stations.

25. Occasional clicks are audible on AM. They are infrequent and not loud, but
annoying when they occur. They coincide with discrete AGC level changes.

26. Rapid keypresses are lost.

27. SSI drops when there is audio near 15 kHz on FM and varies wildly with any
modulation on AM. The display is ambiguous at best on FM and useless on AM.


Updated June 24, 2008
Brian Beezley