Re: ferrite vs sensitivity <satya@...>

Hi Richard:

My understanding is that there are more factors beside ferrite length, including the quality of
ferrite material, the diameter, the type of Litz wire, and probably others. MY guess is that the
S5W and EX5 have good-quality components, whereas Sangean may have given the PR-D5 lesser-quality
components? If you peek inside the units and see what the ferrite diameter and Litz wire looks
like, that would be good info.

I have a S5W, which also struggles here in my RF jungle near Seattle. A tuned loop is oftn needed
to keep the hets and mixing products at bay, even at night.


------- Original Message -------
From : Richard Berler[mailto:lrdheat@...]
Sent : 10/20/2010 12:01:20 PM
To : ultralightdx@...
Cc :
Subject : RE: [ultralightdx] ferrite vs sensitivity

The sensitivity of my ICF-S5W and ICF-EX5 with their 6.375" bars is the equal of my PR-D5
with it's 8" bar. If constructed properly, should there be an expectation of greater daytime
sensitivity with an 8" bar in a radio, or is it like a calculus problem where we are already
approaching the limiting case with a 6.375" bar?

On another topic concerning EX5 vs S5W, I had assumed that the S5W had greater raw sensitivity.
With experimentation just a few miles further away from the mw rf jungle in my area (largely
related to the abundance of Nuevo Laredo mw's in addition to Laredo's stations), the two sets
appear identical as far as usable sensitivity. If the S5W is more sensitive, the EX5 seems to
counter with a lower noise floor. The rf jungle and relatedmixing products are so intense that (on
all of my radio sets including the Grundig G3 with ssb and sync options, and the Tecsun 390 with
it's 1 KHz filter) only mixing products are heard on 1230 KHz, yet 4 miles down the road, Corpus
Christi is heard on that frequency in comfortably listenable fashion.


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