Death to robocallers

I got angry today, after the 7th recorded political phone call from Mitt Romney in just 2 days. I called the campaign and I gave them a piece of my mind. Romney, while the most egregious robocaller, is not the only one.

It’s been disruptive. It’s interrupted me struggling to carry a big heavy box, taking a nap, watching a movie, eating a meal.

I solved the problem. I turned off all the ringers on my phones and put this message on the answering machine:

Hi.

Due to the high volume of political robocalls, we have had to disconnect our phone system ringer until after the South Carolina primary. You may leave a message at the beep.

If someone really wants to reach me, they can call my mobile number which fortunately the candidates don’t know.

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New look

I changed the theme here at Blog or Die! I liked the old one, Misty Morning, but it has technical issues and didn’t seem to work with the new Photo Album. Plus it was a bit narrow. So I’ve installed the WordPress 2010 theme and it seems to be working well. I may replace the stock photo up top with something I took.

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Kchibo KK-D680 radio invites comparison with smaller cousin

I continue to be intrigued by the tiny DSP radio from Kchibo, the KK-D202. That’s the radio that I’m most likely to slip in my shirt pocked when walking out the door. This KK-D680 from Kchibo fits in a shirt pocket too, though not quite as comfortably at one inch thick. The covers are different, but there is a lot similarity under the hood between these two radios.

KK-D680_540

Both radios have Chinese labeling and manuals and are similar in many other respects. I found by disassembly that the KK-D202 used the si4734 digital signal processing chip from Silicon Laboratories, and I am assuming this new radio uses the same based on similarities in operation.

I had two big gripes with the KK-D202: an unlighted display, and sucky AM performance. My first grievance has been totally removed in the KK-D680. It has a large bright orange display that automatically activates when the radio controls are used. AM radio performance has improved, but it’s not all that great. One nice feature of the si4734 radios is the option for a signal strength display. This makes it possible to make a quantitative comparison between radios that use the chip, in my case the Kchibo KK-D202, the Kchibo KK-D680 and the popular Tecsun PL-380. I’ll use that feature in the performance tests below.

A lesser gripe involved tuning. On the KK-D202 tuning was accomplished by up and down buttons that served also as scanning buttons when held down. The KK-D680 adds a real tuning knob, so instead of pressing buttons like forever, you can turn the wheel like forever. However, the new tuning knob comes at the price of a volume control knob not present on the KK-D680. Otherwise the controls are almost identical in function to the KK-D202 even to the magic sequence of the Memory button to switch from 9 kHz to 10 kHz stepping on the AM band. Refer to my article on the KK-D202 for an operations manual for the radio.

The buttons under the digital display are, from right to left: Memory [alarm on / off], Set preset memory +, Set preset memory – and Band Switch [Enable time/alarm set]. The buttons on the right are, from top to bottom: Power [sleep timer], Volume +, Volume – , Tune up [time +] and Tune down [time –]. There is also a tiny reset button upper right.

The radio comes with a carrying strap, plush carrying pouch, ear buds, Chinese manual and external antenna. Mine came from DinoDirect for $22.95 with free shipping, but doesn’t seem to be on their web site any more. [As of today, 1/17/2012, eBay seller DPmega has an "upgrade" version of the radio for sale for $29.90 with $12 shipping. The upgrade version has a 9/10 kHz step setting that's documented (probably a switch in the battery compartment).]

Performance

Since a good bit has been written about the Tecsun PL-380 DSP receiver, I’ll use that as the reference radio for these tests. The value listed is the signal strength followed by the S/N ratio as measured by the DSP chip. (Note that the Kchibo radios display these in reverse order from the Tecsun.)

Test Tecsun PL-380 Kchibo KK-D680 Kchibo KK-D202
FM 88.7 MHz  dBμ / dB 34 / 21 31 / 22 31 / 21
SW 10 MHz 15 / 2 9 / 2 9 / 0
AM 660 kHz (strong local station) 50 / 25 49 / 25 40 / 25

Those numbers don’t reflect the experience of listening. Generally the Tecsun was noticeably better in all cases, followed by the KK-D680 and the KK-D202. Even on the local powerhouse AM station, there was a little hiss on the Kchibo radios that was absent with the Tecsun.

Specifications

Model Kchibo KK-D680
Frequency coverage FM 64 – 108 MHz AM 522 – 1710 KHz (9 KHz step) AM 520 – 1710 KHz (10 KHz step) SW 2.3 – 21.85 MHz
FM Stereo Yes (earphones)
Memories 3 x 30
Sensitivity FM 3.5 μV AM 3 mV/m SW 32 μV
Selectivity >= 40 dB
SSB No
Technology DSP
Battery 2 AA
External DC 3v Center (-)
External antenna jack No
Tuning Digital (up/down, memory, scan), knob
Tuning step AM 9/10KHz, FM .1 MHz, SW 5 KHz
Display Digital
Volume Digital
Signal strength indicator Yes
Whip antenna length 17 3/4”
Local/Distance switch No
Bandwidth switch No
Tone control No
Dial light Yes
Clock Day, Date, Time, Alarm, Sleep
On/off Button
Control lock No
Stereo/mono switch No
Attached battery door No
Size 4 3/4” x 3” x 1”
Weight without batteries 4 3/4 oz.
Carrying Wrist strap
Accessories included Ear buds, external antenna, pouch
Price (including shipping) $22.95
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Kchibo KK-D202 shortwave receiver review

The Kchibo KK-D202 is an AM/FM/Shortwave receiver based on the Silicon Laboratories si4734 digital signal processing chip. There are three versions of the radio: the Chinese labeled D202 (reviewed here), the D202 upgrade (adds 9/10 KHz AM radio channel separation switch in the battery compartment for use in North America) and the E202 with English language labeling.

I bought my radio from eBay seller circle607 who sells the original model under $25 including shipping. The radio comes with ear buds, an external clip-on antenna, carrying strap and a soft pouch. Presumably it also comes with a manual (mine had a manual but for the wrong radio).

IMG_0301

In addition to what you can see in the photo, there is a volume control on top, an earphone jack and an external 3v DC power input jack.

The most striking feature of this model is the vertical LCD display. It is covered by a magnifying lens, necessary to show its 15 different functions. There is no display light, making this only visible in a well-lit environment. When the radio is off, the display shows the time and date and when on (as pictured above) it shows the tuned frequency, band and the time in small characters.

There are 8 buttons and I label the top row from left to right 1-4 and the bottom row 5-8. Button 1 is the power switch. There is also one other button behind a pin hole at the upper right of the radio. It is the Reset Button which you might try if all else fails.

Button Function
1 Short Press: On/off
Long Press: Select/set sleep timer
2 Select preset memory +
3 Select preset memory -
4 Short press: Tune up
Long press: Scan up
Radio off : Increment time/alarm
5 Radio on: AM/FM/SW select
Radio off: Enable time/alarm set
6 Radio off: Alarm on/off
Long Press, radio off: Magic
Radio on: Store memory preset
7 Shortwave band jump
8 Short Press: Tune down
Long Press: Scan down
Radio Off: Decrement time/alarm

 

Operation

So let’s turn it on. That’s the easy part given the universal power switch icon next to (1). Tuning is accomplished through the up (4) and down (8) buttons. A brief press of the button advances one channel step.  Bands (AM/FM/SW) are switched with Button 5. The volume control is on top of the radio.When you tune a station, a pair of numbers is briefly displayed in the upper right of the LCD. These numbers are an indication of the signal quality. The first number is the signal to noise ratio in dB and the second is the signal strength in dBμ. Given the fixed tuning steps, I’m not sure what use these numbers are except perhaps to compare to another radio that also displays them (e.g. Tecsun PL-380). They are displayed too briefly to assist in positioning the radio for best reception.

There are 90 preset memories, 30 per band. Briefly pressing (2) and (3) scrolls through the memories for the selected band. Pressing (6) initiates storing the currently-tuned channel into memory; use (2) and (3) to select an open or reusable memory slot; press (6) again to store. Memory presets are retained (at least for a while) with the batteries removed. This is a blessing because it really takes a lot of button pressing to tune this radio. Pressing (7) switches the radio to shortwave and selects in turn the frequencies 2.30, 3.20, 4.75, 5.95, 7.10, 9.50, 11.65, 13.60, 15.10, 17.50 and 21.45 MHz. Tuning is continuous, but these jumps help you move rapidly through the shortwave bands.

Setting the clock. With the radio off, press (5) to enter setting mode and repeatedly press it to advance the date part being set in the order hour, min, year, month, day. The values are changed with the up/down buttons (4) and (8). To set the alarm, turn the radio off and turn the alarm on by pressing (6). Then press the time set (5) to enable alarm time set. Use the up/down buttons (4) and (8) to set the alarm time. When the alarm is off, (5) enables time setting and when the alarm is on, it enables alarm setting.

The magic button. A long press of (6) does mysterious things. With the radio off, press and hold the alarm button (6). As you continue holding, you will see the following sequence of numbers repeated in the display: “34″, “:34″ “95″ and “:95″.  When “95″ appears, release the button and quickly press the purple button (with the up arrow) twice. “10 kHz” will appear briefly in the display and thereafter the AM tuning step will be 10 kHz compatible with North American stations. Repeat the procedure to switch it back to 9. Timing is critical, so you might have to try it a few times to get it to work.

The “magic button” also sets the volume control range to a couple of values, one of which limits the volume and the other that lets you set it wide open. You just have to play with it to get the right combination of AM step and volume.

Performance

I’ll compare it to the benchmark Tecsun PL-380, itself a DSP radio using the same si4734 chip, and one of the best ultralight models on the market.

The Tecsun using Easy Tuning Mode picked 33 FM stations. Manually scanning the FM band for usable signals on the D202, I found 33 as well. I selected 107.9 (WLNK in Charlotte NC) for a test. This 100 KW is maybe 75 miles away. Both radios provided good reception when I held them in just the right direction. Hand holding the D202 helped a lot, as did touching the PL-380 antenna. I was frankly surprised that the D202 approached the PL-380 favorably. Both radios showed some bleed of a very powerful local station (WMUU) onto adjacent channels. Both showed the signal quality of this station at 55 dBμ / 18 dB.

On shortwave, I like to compare daytime signals from WWV. At 10 MHz WWV was barely audible on the D202, but quite usable (although noisy) on the PL-380. Both radios come with an external antenna, so I gave that a try using a 33-ft. antenna strung across an upstairs room. The antenna markedly improved reception with the PL-380 but made no difference at all on the D202.

The AM loopstick extends across the short dimension of the case and this will hurt AM sensitivity. I am not someone who spends much time on AM radio, so take my comments with a grain of inexperienced salt. I compared the radio with the Tecsun around sundown. The D202 was an unmitigated disaster. It picked up next to nothing and it had distinct whistles at various points on the dial. The Tecsun PL-380 set 97 stations with ETM, and no whistles.

Conclusion

My conclusion is that the Kchibo D220 is a very capable FM radio and should please most FM listeners. It’s small, convenient and capable. For shortwave, it may be the best radio of its size that I have come across. However, for more money and more cubic inches there are better shortwave radios out there. The real weaknesses are the lack of a tuning knob and a dial light, and of course AM sucks.

Specifications

Model Kchibo KK-D202
Frequency coverage FM 64 – 108 MHz
AM 522 – 1710 KHz (9 KHz step)
AM 520 – 1710 KHz (10 KHz step)
SW 2.3 – 21.85 MHz
FM Stereo Yes (earphones)
Memories 3 x 30
Sensitivity FM 3.5 μV
AM 5 mV/m
SW 100 μV
Selectivity >= 40 dB
SSB No
Technology DSP
Battery 2 AA
External DC 3v Center (-)
External antenna jack No
Tuning Digital (up/down, memory, scan)
Tuning step AM 9/10KHz, FM .1 MHz, SW 5 KHz
Display Digital
Volume Analog
Signal strength indicator Yes
Whip antenna length 13.5” (earphone can be used as antenna)
Local/Distance switch No
Bandwidth switch No
Tone control No
Dial light No
Clock Day, Date, Time, Alarm, Sleep
On/off Button
Control lock E202 (and upgrade?) only
Stereo/mono switch E202 (and upgrade?) only
Attached battery door No
Size 2 1/2” x 3 3/4” x 5/8”
Weight without batteries 3 oz.
Carrying Wrist strap
Accessories included Ear buds, external antenna, pouch
Price (including shipping) $12.95 + $9.95 shipping (upgrade model from DPmega runs $29.90 + $12)
Posted in Product Reviews, Radio, Technology | Tagged , , , | Leave a comment

Tecsun PL-118 Stereo FM radio review

I usually write about shortwave radios, but this FM-only radio deserves a mention. It represents a  cost/performance/feature breakthrough based based on a new integrated circuit radio-on-a-chip.

Let’s start with cost. I paid $13 plus $7 shipping from eBay seller ANON-CO. It arrived in 8 days from Hong Kong. I selected a white model, but it is also available in black or orange. The actual radio is slightly under 4” wide, just bigger than a deck of cards. It runs on two AAA batteries.

PL-118

This is a deceptively simple-looking radio. In addition to what you see here, the only other control is a single thumbwheel knob. Nevertheless, this is a fully-functional clock radio with sleep timer and scanning memory. The DSP on the front refers to the digital signal processing chip that basically does the work in this receiver.

Maybe the best approach is to explain the controls. With so few controls, they have to do double duty. The button that looks like a clock face can be pressed and held to enter time setting mode for the hours, minutes and 12/24 hour mode. Hold the button down a second or so to enter time setting mode; set the hour with the thumbwheel. Press the button again to set minutes and again to set 12/24 set mode. When the radio is on, this button briefly displays the time in place of the frequency. The next button that looks like a speaker and sound waves is the alarm set and off/on. Press the button briefly to turn the alarm off and on. Hold it down to enter time setting mode. When the alarm is on, an icon appears in the display as you see in the picture above.

The ETM (Easy Tuning Mode) switches tuning modes. In normal mode, turning the thumbwheel tunes the radio. Pressing ETM switches the receiver to tune by what is stored in the memories and the thumbwheel runs through the memories. A long press of the ETM button initiates a scan of the FM band, loading up all the stations into memory. This feature is similar to many television sets that scan the channels once when the TV is first turned on and thereafter you only see the active ones.

Pressing the VOL. button switches the thumbwheel from tuning to volume with a digital volume level displayed while you set it. The power switch turns the radio off and on. Also, holding it down engages sleep timer setting (the sleep time value is set by turning the thumbwheel). A battery status indicator displays all the time.

In practice, the radio was quite sensitive and I was able to receive 33 stations nicely. The internal speaker was crisp and ok to listen to for voice. For music, the internal speaker isn’t pleasant to listen to. With a good set of headphones, music was very nice, but lacking in the low bass tones.

If you look to the left of the TECSUN logo in the photo above, you’ll see a scratch. That’s my only real problem with this radio. It’s going to scratch easily and not look so cool in time. The buttons, which are integral with the front panel will likely show wear quickly as well.

As for the manual, you are reading the only one I know of. Nothing came with the radio.

Update: I have now found an English manual that covers most of what is in this article.

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