Summertime Shootout Produces New Ultralight Radio Sensitivity Winner
Hello Guys,
Much to the astonishment of the reviewer, a new
Ultralight digital radio model has finally managed to surpass the Sony SRF-T615
in wide-band stock AM sensitivity. In doing so, it has also exceeded
the stock sensitivity performance of the Eton E100.
The new Sangean DT400W has a fully redesigned
RF board, making it much more than just a DT200VX with a yellow cabinet.
The RF board AM components are nowhere near their DT200VX positions, and
Sangean's engineers have obviously solved the problem of limited AM sensitivity
bandwidth (evident in the DT200VX).
The DT400W equals the SRF-T615 performance on low
band, and the Eton E100 performance on high band, making it the only Ultralight
model with unsurpassed sensitivity on all AM frequencies. As a bonus, its
image reception (900 Khz below locals) is negligible, and it has no detectable
spurs in my suburban environment Selectivity is superior to that of the
SRF-T615, and approaches that of the E100.
As a stock unit offered at $52.59 (Amazon), the
DT-400W not only has unsurpassed AM performance, but an extremely sensitive FM
section with outstanding audio quality and 19 programmable memories
Ultralight radio enthusiasts are encouraged to give this innovative AM receiver
a serious look.
The full Summertime Shootout article should be
finished shortly, and includes detailed reviews of the DT-400W, E100,
SRF-S84, SRF-M97, and SRF-M37W Ultralight models..
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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Personal UL Distance Record
John Cereghin <pastor@...>
Finally broke the 2000-mile barrier with my DT-200VX last night, running barefoot.
2200 EDT 750 YVKS Caracas, Venezuela, gave a list of network of stations at TOH, many in Caracas, mentions of "R. Gramma". Good with WSB nulled. 2053 miles. Also tentative logs of Colombia on 770 and another Venezuelan on 910 but no IDS on what seemed to be a good Latin American evening. John Cereghin Smyrna DE
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Re: New E100: First impressions
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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Re: Grundig G6
satya@...
I'm with John, and also wondering if with the small SSB tuning steps, one
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can tune a couple khz down from a station and then zero beat back in, thus prefering the lower sideband over the upper? Maybe even shaving the upper one off? The ability to mimic true ECSS on the G6 would be incredibly valuable. Kevin S Bainbridge Island, WA
If there are any G6 owners out there, I'm still wondering about the
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Re: Grundig G6
John H. Bryant <bjohnorcas@...>
If there are any G6 owners out there, I'm still wondering
about the MW tuning steps with the jog dial. The review that Steve
pointed me to talks of "small steps" or such, but I'm really
hoping for at least 100 Hz as the smallest step in Slow.... for SSB use,
natch. Anybody got one??
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John B.
At 12:24 AM 8/16/2008 -0500, you wrote:
John,
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Re: New E100: First impressions
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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OOPS! Sorry! Re: New E100: First impressions
John H. Bryant <bjohnorcas@...>
Stephan,
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I just noticed that I made a spelling error with your given name. Sorry. I'm a bit familiar with that, being known as John/Jon/Jack/Juan :>) I noted that your serial number was only a couple of thousand above my NEW one, both starting 070903. Thanks again! John B. (aka Big Juan)
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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Re: New E100: First impressions
John H. Bryant <bjohnorcas@...>
Steven,
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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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Re: New E100: First impressions
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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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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Re: Grundig G6
John H. Bryant <bjohnorcas@...>
Thanks, Steve! That was an excellent review.
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The G6 sounds like a winner, though I was disappointed to learn that the AM band only used the ferrite bar antenna, where SW was provided with an external antenna input port. I suspect that I'll be opening the back and installing an inductive loop from the ferrite bar to the antenna input port..... might even shorten the ferrite bar as I'm not interested in using the G6 Barefoot. John B.
At 12:24 AM 8/16/2008 -0500, you wrote: John,
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Re: Grundig G6
Steve Ponder <n5wbi@...>
John,
Read the G6 review by Ann E. Revelle on the Amazon webpage ... http://www.amazon.com/Grundig-G6-Aviator-aircraft-Shortwave/dp/B0014T5UM4 <snip> "Unlike some other radios, SSB tuning is also available on the G6 on the AM band as well as on SW which is a very useful feature. The separate ability to step tune in very small increments with the jog dial setting is also excellent in my opinion once a signal of interest has been located." <snip> Sounds like this person may have answered your questions! 73, Steve N5WBI Houston TX
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Grundig G6
John H. Bryant <bjohnorcas@...>
Even though the G6 does not fit the definition of an ultralight, I'm very tempted to buy one as a spotting receiver to use on my upcoming trip to Peru. I'm going to be on the northern coast of Peru for several nights and a hotrodded E100 is going with me. I have very limited packing space, so the tiny G6 seems a perfect choice. I've looked over the specs and the manual and I can't find the answer to two burning questions:
1: What is the tuning resolution on MW.... surely, its at least 100 hertz to be able to resolve SSB on SW 2. For sure, does the SSB mode work on MW. Help would be appreciated. John B.
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New file uploaded to ultralightdx
ultralightdx@...
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the ultralightdx group. File : /1431Sawa - Djibouti-081508.mp3 Uploaded by : vo1_001_swl <vo1_001_swl@...> Description : Radio Sawa Djibouti on 1431 khz with the SRF-M37V You can access this file at the URL: http://groups.yahoo.com/group/ultralightdx/files/1431Sawa%20%20-%20Djibouti-081508.mp3 To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.htmlfiles Regards, vo1_001_swl <vo1_001_swl@...>
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New file uploaded to ultralightdx
ultralightdx@...
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the ultralightdx group. File : /720KNR Greenland-81508.mp3 Uploaded by : vo1_001_swl <vo1_001_swl@...> Description : KNR Greenland on 720 khz with the SRF-M37V You can access this file at the URL: http://groups.yahoo.com/group/ultralightdx/files/720KNR%20Greenland-81508.mp3 To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.htmlfiles Regards, vo1_001_swl <vo1_001_swl@...>
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New file uploaded to ultralightdx
ultralightdx@...
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the ultralightdx group. File : /1521BSKSA -Saudi Arabia-081508.mp3 Uploaded by : vo1_001_swl <vo1_001_swl@...> Description : BSKSA 1521 Saudi Arabia on the SRF-M37V You can access this file at the URL: http://groups.yahoo.com/group/ultralightdx/files/1521BSKSA%20%20-Saudi%20Arabia-081508.mp3 To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.htmlfiles Regards, vo1_001_swl <vo1_001_swl@...>
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Loggings
Allen Willie
All new Yahoo! Mail - Get a sneak peak at messages with a handy reading pane.
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Warning: DT-400W AM Alignment NOT Like the DT-200VX
Hello Guys,
When performing a routine AM alignment on the new
Sangean DT-400W unit in preparation for the Summertime Shootout, it was
discovered that the 1400 kHz trimmer and AM IF transformer have been relocated
to an almost inaccessible position under the digital circuit board.
Whereas previously these adjustments were barely
possible on the DT-200VX either by desoldering the speaker wires (or rotating
the front panel while pulling all available slack from the speaker wires), the
only current option is to run about 14 jumpers from the RF board to the digital
circuit board, thereby providing both digital and RF functions while the
technician separates these boards to provide enough space to make the alignment
adjustments. This assumes that the technician will not induce alignment
errors because of the RF jumpers acting like stray "antennas." For
all practical purposes, this makes high-band (and IF transformer) alignment
of the DT-400W a technical boondoggle which should be avoided.
The loopstick may still be easily peaked for
low-band sensitivity, and this adjustment is recommended for a moderate (in my
test unit) boost in low-band performance. For a design which already had a
reputation for suffering from limited AM sensitivity bandwidth (enabling the
technician to either peak low band or high band), however, this new design of
the DT-400W may well condemn it to mediocrity in high-band DX
performance.
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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SONY E10W
lrdheat
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Re: BIG OOPS!!! Over !00 Ultralight Awards Conferred!
bbwrwy
John:
I knew when I saw the an award for six provinces someone had been left of the list. I was just about to send you an email. Maybe some day, but to date I've only heard six Canadian stations with an ULR, half in Saskatchewan. Good DX everyone. Richard Allen.
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