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Review of Sangean HDR-16 HD Radio on Amazon

I originally posted this Mar 25, 2017 review on Amazon as a result of purchasing and testing the radio. Yesterday, when looking to see if there were any other newer reviews, I found that my review had been deleted because of the following;
"Your previous review of this product did not comply with our Customer Reviews Guidelines. Amazon does not permit reviews from customers whose relationship to the product or seller may be perceived as biased ."

Update: After writing to the Amazon Community Team, voicing my displeasure with their deletion, my review was re-instated as of the writing date of Mar 25, 2017. The reviewer apologized for being deleted but no reason was given.

Here it is an electrical engineer's analysis of the radio!

Sangean HDR-16 HD Radio/FM-Stereo/AM Portable Radio

Sangean HDR-16 FM HD Radio

A few years ago, I discovered HD radio and I immediately liked it! Esp if you like classical radio, HD is about the only place you can find it today . . . for FREE!

When I saw that Sangean was about to release their new HD radio, I signed up! But as you know, it took quite some time before it was actually released, about 6 months later. I personally think it needed another 6 months of engineering before it should have been released. Even though I like it, it still lacks needed improvements.

It gets only three (3) stars! Here are the needed improvements.

1) The outside case is "shiny" black. It should have been a dull/satin finish case that is the same as the topside of the case. It's not necessary to show "finger-prints"!

2) The storage buttons (5) should be under the case carry strap so that you can access the channels WITHOUT having to look and FEEL for the channel buttons. If mounted as recommended, you would only need to FEEL for the correct button.

3) It should remember your LAST setting. For example, if it was the CLOCK, then it should remain so when changing channels. Pressing the INFO button will allow you to change the function displayed.

4) Should have rechargeable battery capability. It's easy to do; a diode and some slight wiring changes would make it a re-chargeable radio! Also it is not that easy to replace the batteries b/c of the smaller than needed battery "door".

5) Forgets the HD channel that it was tuned to when turned-off. If you were listening to an HD2 channel when you turned it off, it tunes to the HD1 channel when turned on. Not nice!

6) The signal strength function shows as line of sixteen (16) "boxes" across the bottom of the display. A better signal strength function would be 3 or 4 vertical bars as used in cell phones. The present indication does not show a "full-quieting" signal. Since the radio doesn't switch to the FM channel's known HD signal it must not be a full-quieting signal even though all boxes are illuminated.

7) Backlight goes off with battery power. It doesn't consume that much energy so it should stay on. However, in DAYLIGHT, the backlight can't be seen so adding a switch to make it a user optional feature or add a light-sensitive device (photo-resistor) to do it automatically.

8) IF Selectivity*: It appears that there isn't enough filter stages. It ACTS is if there is only one (1) IF filter stage (230Khz) which makes it susceptible to close-by-channel interference. If this is correct, a better choice would have been 180Khz. The BEST solution is a front panel PUSH BUTTON with allowing the user to select WIDE / NARROW SELECTIVITY. With NARROW, the adjacent-channel interference would be minimized with the (possible) loss of RDS.
*  A simple yet effective method to check any FM radio's selectivity is to tune-off the selected station to see if it still can be heard. So for KUSC @ 91.5Mhz, tune to 91.6Mhz and 91.4Mhz. If you can still hear the station, the radio lacks selectivity.

9) Gain: The radio appears to have insufficient gain b/c the FM channels that SHOULD BE received in STEREO and/or HD, can't be attained. LOCAL stations are OK but stations that are still decently strong, do not even light the ST indicator, let alone the HD indicator even with an almost full-scale signal strength indication (#6 above). A similar test with another [Insignia] radio produced HD with the same FM station. VERY UNHAPPY about that!

10) External Antenna: An external jack needs to be added b/c of 8) and 9) above.

GOOD Features:
1) Sound: The audio produced from 2-1/2" dia speakers (w/ foam SURROUNDS) is excellent. With the TREBLE and BASS equalizer adjustments, the sound is amazingly good. The volume level outside w/o significant distortion is also quite good. The sound quality, the range of equalizer adjustment and the volume level are three huge features of this radio.

2) The REC OUT jack is also a great feature. You can record or, in my case, do spectral analysis with external program such as SpectraPlus.

3) C-Cell Batteries: good choice since many of the newer HD radios use AA cells. The small current capability requires that they be replaced regularly. Nothing smaller than a C cell should be used. Personally, a D cell battery could have been used with a small case size enlargement.