Re: Eton E100 Performs Well with 7" Loopstick Transplant

Gary DeBock

Hi John,

Dirty rat, indeed! :>)

Right after I posted my E100 7" transplant progress report, I
noticed photos of your E100 12" transplant project. This was after I
had increased the loopstick length of my own E100 transplant to
13.25"... purely by coincidence, of course.

The 13.25" loopstick E100 is kind of a mixed bag, with increased
sensitivity over the 7" model, but also with increased urban RF
issues (slop and spurs). The Vancouver RF pounding Orcas Island will
probably not be very well-mannered in your 12" model, I would surmise.

A full daytime "shootout" was conducted between the analog 14"
SRF-39FP and the digital 13.25" E100. The hot-rodded Prison Radio
easily sentenced the Expanded Eton to second place, in sensitivity.
The E100 was more competitive with the SRF-39FP on the high end,
however. Selectivity was a tradeoff, with the E100 showing better
selectivity on the low end, and the SRF-39FP on the high end. The
E100 has more spurious mixing products, and a nuclear-powered KSUH-
1450 image on 540 (absent on the Prison Radio).

For those hobbyists considering an E100 loopstick transplant,
the 7" model provides a lot of "bang for the buck." It will increase
sensitivity greatly, while maintaining good selectivity and spurious
rejection. 14" and 21" models should be reserved for hard-core
DXpedition fanatics, who seek out isolated ocean beaches in the
ultimate quest for Ultralight excitement, IMHO. The E100 has some
very good points (with 200 memories and digital tuning convenience),
and its extreme convenience for loopstick transplants makes it an
obvious first choice for anyone dreaming of super Ultralight

73, Gary

--- In ultralightdx@..., "John H. Bryant"
<bjohnorcas@...> wrote:

Gary, you dirty rat!

I had hoped to beat you to one of the transplants... as you say,
easiest, the E100. Unfortunately, packing for our migration to the
Northwest has stalled progress on my 12" transplant, using my last
Big Bar.. I did get the base and mounting board done, though and
have posted two pictures to our Photo Section. Its the second
in line right now.

I hope to make this thing somewhat modular, so I can plug in the
or pop it out and, using the same board, bar and coil, plug in a
tuning cap and use it as an external booster bar for other
may take some external electronic trickery or may not work at all.

In any case, I'll be able to compare a stock E100 riding on my
existing 12" external booster bar with this set up where the 12"
is integral to the unit.

Frankly, I expect this thing to be swamped in the RF cesspool of
Victoria/Vancouver, but I'm very hopeful for success at Grayland.

Congratulations on the E100 transplant and continuing to break new
ground for us, Gary!

John B.

At 03:47 AM 5/12/2008 +0000, you wrote:

Hello Guys,

It what was probably the easiest AM-DX loopstick transplant ever
performed, a 7" loopstick from a Channel Master Super Fringe (model
6515) was soldered into an E100, resulting in greatly improved
sensitivity (and apparently maintaining great selectivity).

For a variety of reasons, this transplant is extremely easy to
accomplish, even for those who feel intimidated by a soldering
There are only two connections to the stock loopstick, both easily
accessible on the back circuit board. The stock loopstick is
very easily with an exacto knife, or even a flat screwdriver.

If you are lucky enough to get a Channel Master Super Fringe
model 6515 off of eBay (one went for $8 this morning), you don't
need an LCR meter to do the transplant. The stock coil has an
inductance of .297mh, almost the same as the Channel Master long
coil, on the 7" ferrite bar. Simply solder in the Channel Master
long coil on the 7" loopstick, and peak it on a 600 kHz signal, as
described in John Bryant's E100 alignment file.

The 7" loopstick E100 "smokes" a stock unit in DXing, and
provides stiff competition for the 6.25" Sangean DT-200VX model. It
will shortly receive a couple more 7" blank bars, to face the
ultimate RF overload test. If its superior selectivity holds up, it
may well be the great combination of Ultralight sensitivity and
selectivity that we DXpeditioners have been looking for.

73, Gary DeBock

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