Re: Tecsun PL-606 1 kHz DSP Ultralight-- More Information

Gary DeBock

Hi Farmerik,
Yes, the new PL-606's LW operation is set up exactly like that of the PL-360. The LW frequencies are added to the MW frequencies, to make one large, single band from 150-- 1610 kHz. The radio tunes in 1 kHz steps on this "mega-band" if the tuning thumb wheel is rotated slowly, and in 9 kHz steps if the thumb wheel is speeded up.
73, Gary 

In a message dated 11/4/2010 9:51:28 A.M. Pacific Daylight Time, farmerik@... writes:

When the PL-606 tunes LW, does it tune AM BCB with it like the PL-360? [about 150-1620 KHz. in one band with 9 KHz. steps or 1 KHz. steps]-FARMERIK

--- In ultralightdx@..., D1028Gary@... wrote:
> Hello All,
> Tecsun's newest DSP Ultralight was taken for a "test drive" during
> TP-DXing this morning here on the west coast, primarily to check out the
> compact little radio's "soft mute" level, and MP3 audio recording quality.
> Asian signals weren't exactly booming in, but there was a fair signal around
> 1420 UTC (0720 PDT) from 738-BEL2, Taiwan's 100 kw "big gun."
> The new PL-606 was inductively coupled to the 9' PVC loop (which
> brought Taiwan's signal on the PL-606 up from inaudible to fair), and 1 kHz
> frequency offset tuning was used to check the radio's "soft mute" signal drop
> off. ULR transoceanic DXers frequently use this 1 kHz offset tuning to get
> further away from domestic splatter, so long as the DX signal drop off on
> their ULR is not too severe (as in the case of the PL-380, and the CFJ455K5
> IF-filtered E100's and SWP's). In this morning's test, BEL2 was tuned in on
> its 738 kHz frequency on the PL-606 for the first 20 seconds of this MP3
> (along with a 2 kHz heterodyne and 740-KCBS splatter), while the second 21
> seconds were recorded on 737 kHz _
> ( . Although the 1 kHz offset
> tuning did remove the heterodyne and 740 splatter, it also removed most of
> Taiwan's signal, a result similar to the PL-310's "soft mute" behavior.
> Further testing against both the PL-310 and PL-380 confirmed that the
> PL-606's soft mute behavior is very similar to that of the PL-310,
> although because the new radio's AM sensitivity is significantly superior to that
> of the PL-380, even with its greater "soft mute" drop off, the new PL-606
> can usually match the PL-380's TP-DX station signal quality when 1 kHz
> detuning is used. Surprisingly, the compact PL-606 has been matching the larger
> PL-310 in AM sensitivity on all frequencies from 530-1700 kHz.
> The lack of a direct-entry keypad on the PL-606 makes it necessary to
> rotate the thumb wheel multiple times in order to shift from the low band
> to high band, unless stations are already stored in memory. Another quirk
> (at least in my PL-606 review model) concerns accessing the LW band. In a
> PL-360-style mystery system, the PL-606 lacks any front-panel indication that
> it can even tune the LW band, nor does the current user manual tell you
> how to access the frequencies. The method is to turn off the radio, press the
> 9/10 kHz control down until "9 kHz" disappears (and the clock comes back),
> then press the "MW" control down until "LW On" disappears (and the clock
> comes back). Although that is the LW-band access procedure, in the case of
> my review model, the radio still has a quirk somewhere that is preventing LW
> reception.
> The PL-606 is noticeably smaller and lighter than either the PL-310
> or PL-380, and probably shares a lot of compact circuitry with the tiny,
> vertical-form PL-360. The new model can be reasonably pictured as a horizontal
> form PL-360 with far superior AM sensitivity, and with all the Si4734 DSP
> filtering options. That's a very effective combination of sensitivity,
> selectivity and portability on the AM band-- with a pretty low price as a bonus.
> 73 and Good DX,
> Gary DeBock
> (Photo below is also at _
> ( )

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