Tecsun PL-660 in Taiwan, a complete follow-up test ,Radio Reviews


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Tecsun PL-660 4

A few days ago, I deliberately choose everywhere in the AM radio transmitter (12 transmitting antenna) near Shihlin near Taipei demanding the “near field” strong field tests to see PL-660 test against adjacent channel interference wave, PL-660 in the AM mode, powerful anti-interference ability and appropriate NARROW BAND FILTER I was so impressed by the selection, several local SWL have also expressed surprise and curiosity.

This time the test environment are:

1 strong field area FM radio reception conditions

(2) the general field area adjacent channel interference resistance ability of FM

3 weak field area FM radio reception conditions

4 General field area AM / LW reception conditions

5 weak field area AM / LW / SW – SSB radio reception conditions

A. strong field area FM radio reception conditions:

FM radio stations in the forest of election Yangmingshan area, Taipei City; the area within a radius of 800 meters squeezed into the 11 FM transmitter, power from 3KW-30KW range.

PL – 660: Select the LOCAL position; PL – 660 from the tower about 200 meters of the station to listen to the signal at the intersection; that can clearly listen to the station, did not occur due to interference resulting in overload or distortion of the sound situation. Other occasional radio in these areas due to too strong electric field distortion caused by overload or phenomenon.

The electric strength test site strong, I have tried in the vicinity of a traditional automatic camera (stupid camera) shot at close range aerial photo shoot, but the camera has automatic volume in the end the new film, which is obviously received strong interference field strength, for a new roll of film, took place at the close of the second; this test should be very harsh, and even worse, I have been burned to the ground so near beloved SONY ICF-2001D Radio!

B. General field area adjacent channel interference resistance ability of FM:

Election in Taipei’s Chiang Kai-shek Memorial Hall Center for the park; Taoyuan County Longtan Peak FM 97.5MHZ (from the Taipei District 40 KM, transmit power 8.5 KW); northeast of Taipei’s Fingers FM 97.7MHZ (from Taipei 12 KM, transmit power 20 KW); bamboo mountain FM 97.3MHZ (from the Taipei District 16 KM, transmit power 3 KW) each of the three stations away from 0.2 MHZ, to be able to clear uninterrupted reception FM 97.5 MHZ is undoubtedly stringent test; pass this off test only SANGEAN 909X, when listening to a very slight interference, and PL-660 and DE-1103 there is more than moderate interference, is not pleasant to listen to.

C. weak field area FM radio reception conditions:
Election in Yilan County outside the city to the beach Australia; Taipei bamboo mountain to the FM 96.3 signal after 46 KM diffraction has been quite weak after traveling electric field, the result is: SANGEAN 909X voice most clearly, slightly rustle, DE-1103 and PL -660 rustle then some more.

D. General field area AM / LW reception status:
Select the CKS Memorial Hall in Taipei City for the park; DE-1103, PL-660 and 909X Taipei area to receive all AM units have very good results; and choose AM 1593KHZ fishery radio station (from Yilan County Peak to the AM station from Taipei 38 KM) signal is weak, SANGEAN 909X recipient best, PL-660 and DE-1103, followed by; then select the AM 774 KHZ (sent from Taoyuan County, the commercial radio stations, 25KW) signal some weaker, the same results with the aforementioned.

LW part of the scan channels all the NDB table (Aviation display unit) for example: 250KHZ, three radio has good sensitivity, but SANGEAN LW band will appear in the clear mirror of AM station interference, PL-660 and DE-1103 image disturbance is very slight.

For a place: in the distance AM 729KHZ (campus radio station, launched in Taipei Nam 7KW) 500 meters (slightly larger than a wavelength range), PL-660 medium-wave mirror interference appeared.

Weak electric field E Zone AM / LW / SW – SSB radio reception conditions:

Selected 45 KM from Taipei County, Ilan head for the beach outside Australia; AM part selected 1521 KHZ, (from the Japanese Ryukyu OKINAWA transmit power 1 KW; from the recipient’s location is about 230 KM) and the intensity of the recipient effects to SANGEAN 909X best;

For a frequency: 864 KHZ (from the Japanese Ryukyu RADIO OKINAWA, transmit power 10KW; from the recipient’s location is about 580 KM) reception similar results. In the northeastern coast of Taiwan, often receive the ball Japan’s NHK and sulfur U.S. AM 648 radio stations, but the signal is not strong, where do the DX carry a slightly higher sensitivity of the AM radio is often a good harvest.

For a frequency: 999 KHZ (from Taipei, the transmission power 10KW), arrived outside Australia only moderate signal intensity, but the 990 KHZ for the local radio station, adjacent channel interference can be observed in processing power. SANGEAN 909X only slight interference occurs, listen completely without problems, while the PL-660 to listen to, there are more interference there.

LW part:

Selected test sites Yilan County outside Australia beach, far away from short-wave radio and local radio less, is very suitable for DX test sites; PL-660, 909X, DE-1103 has very good sensitivity of three The received, three radio can receive clearly.

SW Radio part:

Hundreds of short-wave radio transmitter at every turn KW of electricity, it is difficult to distinguish this part of the three radio brought the sensitivity difference between what the recipient how much time actually listening to is the case.

Listen 9595KHZ RADIO NIKKEI, 17750KHZ Australia wide testing, the sensitivity is very close to that of the three, but the effect was also listening to recognizable differences in sound quality (TONE controls covering the quality of sound performance and speaker default), alt field to help improve the recognition degree, on the contrary will result in identification difficult low range, sensitivity and sound quality that is recognizable form radio listening are two major factors. PL-660, DE-1103 sound quality between the two partial alt field is conducive to short-wave listening, especially when the signal is weak, and vice versa, SANGEAN 909X pay attention to the full range showed low treble range, but not conducive to listening to shortwave broadcasting.

I personally prefer this part of the PL-660, in addition to the individual operations (radio and transmitter) used outside, SSB SYNC. And moderate IF NARROW BAND FILTER is to use the PL-660 attracted me to two important factors; many radio communications manufacturers to make more short-wave broadcasting and communications reception and noise removal have installed IF NARROW BAND FILTER, DSP, NOISE BLANKER, ATT SWITCH … … and so can effectively filter out interference and to avoid overload of the many features. The PL-660’s three-stage sensitivity switch (DX, NORMAL, LOCAL, corresponding to the communication unit of the ATT SWITCH) in the event of a variety of reception environments such as the flexibility to use, can easily make the front of the high-level circuit in a pleasant and But contained in the work environment; (909X continuous control of the function with VR, I more accustomed to).

NARROW BAND FILTER is effective so that the “selectivity” (SELECTIVITY) performance is moderate, taking into account the quality and remove the interference! I emphasize once again that many in the vicinity of the price advanced radio IF NARROW BAND FILTER selection very “appropriate”, not and more. Taiwan to dense population, short-wave frequencies below covered with man-made electrical noise; night appear more likely in the short-wave band the Pacific Asian countries launched the super signal, sometimes interfere with each other, flexible use of PL-660’s three important functions (including SSB SYNC) will make the operation of PL-660 have nearly the fun of operating shortwave communications machine.

SW – SSB radio reception parts:

In general SSB short-wave radio broadcast transmitter power is smaller, easier to feel the difference in sensitivity.

Selected 5170KHZ, 8117KHZ USB (Taiwan Fisheries weather) as a listening reference, three radio can clear reception; (three radios were transferred to the highest sensitivity), 909X telescopic antenna longer, slightly higher sensitivity, but also the noise floor relatively little (IF filtering mechanism seems to be wider than the frequency width of the place a bit).

Both sets of signals in the 1KW reported the following; in terms of relative strength compared to ham family, sensitivity to the longer distinguish more clearly, it is usual to find HAM’s 14. 025 CW for testing. (Usually between amateur communication transmitter power 10W-1KW), when compared to three radio managed to transferred LSB mode, (DE-1103 to adjust the BFO aligned PL-660’s reception content) were as follows:

DE-1103 CW sound crisp, CW TONE highest recognition, the noise floor is also small, easy, IF narrow band filter to select the appropriate listening to CW and SSB sounds remarkable! But the jog dial function sometimes confused (to frequency should increase the frequency of side spin has turned down); SSB USB and LSB are not only sub-BFO adjustment, but for users familiar with DE-1103, the little adjustments.

PL-660 CW recognizable tenor voice side, the sensitivity is slightly less than the DE-1103 and 909X, the noise floor is small, the volume knob to maximum CW volume than the other two quietly; this, I readily take to pre-prepared 3 m long cable, pull in the PL-660 take the telescopic antenna, 14025 KHZ CW significant increase in the volume immediately, of course, will increase the noise floor.

909X CW low range performance to benefit from the CW TONE higher but still able to recognize, the highest sensitivity, maximum volume, but the background noise is also large, 14025 KHZ Friends of Taiwan while many operating CW transmitter “grab Taiwan” when received Radio the most “complex” (IF filtering mechanism to set a little wide; transmitters of the public may not be very friendly and accurate frequency units, each located in the vicinity of 14025 KHZ), if turned to listen to the SSB, they also highlighted the range of low and noise floor large defects.

Wide range of writing the above this week to use PL-660 and the experience of other two machines, for unless the user could write a completely different experience with the experience; how each person functions on the radio, and understanding the different performance requirements, use in different environments, each of likes and dislikes are different.

I was fortunate enough to recognize two groups of SWL and HAM radio friends have completely different requirements. In love with SW-SSB-CW DX stations and love of friends of SWL were broadcast in the local for PL – 660 have different views and expectations. With the PL-660 and other radio experience I began to think: What is the best radio??

… … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … …

If I was fortunate to know these well-known radio designers, I will tell them: YOU REALLY ARE ONE OF THE BEST!


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