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New E100: First impressions
Stephan Grossklass
After the report of the new, all-different E100s, I decided
to finally snatch one up before it was too late to get an "old" version. I received my sample (Lextronix branded over here) today, which was originally bought in March this year and only saw one vacation of use. Old enough, I thought. After an initial performance check, I compared the serial number to the others given - 0709032118, which means that it's a new sample, unfortunately. This was later confirmed by opening up the set. (Getting it back together was not that much fun since sliding the volume control wheel back in is not entirely trivial.) BTW, you can basically leave the antenna screw alone. My initial impressions are that while this set won't win any awards with regard to audio fidelity (channel balance seems noticeably off, and judging by noise level there's the usual CXA1622 amp IC), it is a pretty decent performer. Pitted against a Sony ICF-SW7600 on mediumwave, it didn't come in far behind, just a little more noisy audio. Shortwave sensitivity compares well to a DE1102, and the 3-step attenuator is neat. The IF filter seems to be a 6-element job with a medium bandwidth, judged by ear. While background noise levels tend to be higher, AGC range seems better than on the DE1102 (which is a little weak in this regard). AM audio is similar to the DE1102, so I assume the TA8132/CD8132 IC also found use here. (No idea what that big squarish IC on the old E100 could be.) AM is nice and clear over the speaker. The carry pouch is nice, similar to what the Redsun RD1220 has on the outside but with more padding. The rubberized coating also feels nice, but I'll be careful with it since it has been reported to wear off. System settings are non-volatile, while the clock is not kept if power is removed for too long. Frequency entry has no apparent way of cancelling other than waiting. Timeouts seem more user friendly though. Then I started chasing LO hets in order to determine the IFs. Nothing. Really nothing. Not at +/-450 or +/-455 kHz, not at +/-10.7 MHz, not at +21.45 MHz. No traces of 10.25 MHz, 21 MHz or 21.9 MHz crystals either. There is some internal oscillator around 11.15 MHz but it's always on regardless of waveband and not especially stable. This can only mean that the new E100 is DUAL CONVERSION with a high 2st IF, presumably the standard 55.845 MHz. No wonder that the MW section had to be changed, it is now wideband. It is to be assumed that the set is more related to Tecsun PL450 and PL600 than to older concepts, my guess would be that it's a shrunk-down PL450. Image rejection on shortwave appears to be better than average - not as bulletproof as the DE1102, but better than the ICF-SW7600. Overall, this means good news for shortwave listeners (which now have another small and well-performing set to choose from) but not so good news for ultralight MW DXers. Looks like distribution in North America is quite slow. Stephan
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Hello Stephan (and John),
Thank you very much, Stephan, for the excellent
and thorough technical description of the "new" (serial # 0709XXXXXX) E100
model. Until your detailed report, only John had reported receiving one of
these radically redesigned E100's, which caused consternation here in North
America due to the changes in the MW components.
As you may be aware, the "old" E100's, with their
455 kHz IF, two-lead loopstick coil connection, and other refinements have
proven ideal here in North America for DXpedition modifications, enabling the
stock sensitivity and selectivity to be greatly enhanced. Specifically,
these involve replacement of the stock IF filter with a Murata CFJ455K5
ceramic-type upgrade, and the mediocre stock loopstick with an Amidon 7.5" x .5"
ferrite-bar based sliding-coil loopstick. According to your description of
the revamped MW section in the "new" E100 model, these modifications may no
longer be possible.
I recently ordered my fourth E100 from Durham
radio in Canada to investigate their willingness to screen serial numbers, to
avoid sending out "new" models. While not absolutely promising to send me
an "old" model, Jamie and the Durham crew did indeed send me an
"old" E100 (at $44.00 US, the current dxer.ca special price), which was
very promptly shipped European enthusiasts might try that source, if
all else fails.
73, Gary DeBock Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos.
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John H. Bryant <bjohnorcas@...>
Steven,
toggle quoted messageShow quoted text
Thanks for the comments on the newer version of the E100. I'm sure that they will be helpful to Gary and I'll put your Serial Number in the database. I would love to hear the manufacturer's explanation of this design/marketing decision!! John B.
At 02:26 PM 8/16/2008 +0000, you wrote: After the report of the new, all-different E100s, I decided
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Stephan Grossklass
--- In ultralightdx@..., "John H. Bryant" <bjohnorcas@...>
wrote: Redesigns "under the hood" are not uncommon among Chinese radio manufacturers. Just think of the Tecsun PL550 which originally wasn't so hot on shortwave but was reworked after the PL350 (with generally better performance) came out. Similar moves resulted in the previous E100 (PL200) versions. Admittedly a complete redesign isn't common. A distinct advantage of the current design for the manufacturer is that it has far fewer alignment points. In addition, full shortwave coverage does not require RF tracking on at least 2 ranges, as it would be necessary for a single conversion set. The effort saved there can be invested into a good 1st mixer, the ones integrated into the usual ICs do not tend to be so great in terms of strong signal handling. (That a wideband design is more susceptible to intermod generated by further-off stations is another matter.) Basically the old design, being all single conversion, was anachronistic even when it came out. Building a competitive shortwave portable with single conversion just isn't possible. (Mediumwave is a different story.) Tecsun could only pull this off with very cheap labor. I would guess that Tecsun wanted to discontinue the PL200 in order to harmonize radio production, but contracts for the E100 weren't ending any time soon. So they took the PL450, shrank it a bit, and there was an OEM-only set. (Degen now makes a number of OEM-only models as well. This reflects the changed role of these Chinese manufacturers.) Since all of Tecsun's PLL portables are operated almost identically anyway, this area could be left virtually unchanged. Stephan
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huelbe_garcia@fastimap.com <huelbe_garcia@...>
Stephan Grossklass wrote:
So they took the PL450, shrank it a bit, and there was an OEM-only set.Following the brilliant work made by Stephan, I played around with Google Images and find this page: http://www.5bcl.com/Article/Class11/200802/2059.html It has internal pictures of Tecsun PL350 and Tecsun PL450. I quickly compared the E100 old/new pictures in group's photo area [1] posted by John. There is no direct comparison, you soon realize PL3/450 are 4.5v receivers. However, here my quick findings: . PL-350 and old-E100 share the same ferrite rod antenna (a small coil on the right of the rod); . PL-350 and old-E100 have a 'eye-catchy' integrated circuit in square format; . PL-450 and new-E100 have a centered, spread coil over the ferrite rod plus a pick-up coil at the right. Stephan, your hypothesii make completely sense. Besides that, if only constructional details could rate the performance of a receiver, I would say Tecsun's PL450 is good. It was nice to see a number of RF shields and real micro-switches (instead of membrane-kind) on the PCB. --hg [1] http://ph.groups.yahoo.com/group/ultralightdx/photos/view/7293?b=2
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