Thanks for your comments. The SRF-39FP
Slider project was probably irrelevant anyway, since until we can find a way to
upgrade selectivity in the Sony analog units, these highly sensitive Amidon
SRF-39FP's will be useful only on relatively clear frequencies-- a
poor choice, compared to the fully-modified E100's.
A DT-400W Slider project is definitely planned
here for the winter, in which piggybacked 40/44 Litz wire coils are shifted
along a Type 61 Amidon 7.5" ferrite bar. My guess is that it will equal
the E100 Sliders in sensitivity, although it's doubtful that we can find
any 450 kHz IF filter that will provide a selectivity upgrade to
compare with the phenomenal 455 kHz Murata filters in the fully-modified
E100's. There are some modest 450 kHz filters that Guy has tried in the
DT-200VX (and a 450 kHz DT-400W filter project posted on dxer.ca) that
might at least provide a moderate selectivity boost, in addition to
the presumed massive sensitivity boost provided by slider
loopstick. Without 1 kHz tuning resolution, the fully-modified
DT-400W's will probably not compete seriously with the Monster E100's, but
they should at least be interesting enough to keep fanatical tinkerers from
complaining about the bad TP conditions during the winter doldrums :>)
John, I still have a "Slider-only" E100 here, and
really enjoy using it during domestic DX, and on daytime band scans in
unfamiliar locations. The Slider-only E100 would be a
real blast for domestic DXers, combining great sensitivity with
outstanding audio fidelity. Unless the user is a hard-core transoceanic DX
chaser (or an urban dweller with many troublesome locals), it may well be the
ideal hot-rodded Ultralight.
