Re: Four (Medium Wave) FSL Relative Strength Shootout MP3's


Hi Gary;

Excellent, revealing tests. Thank you.
For sake of easy comparison, I have re-edited your samples into a new MP3. You will hear 10 seconds each - barefoot PL380, 3" FSL, 4" FSL, 5" FSL, 7" FSL. Do you notice a point of diminishing returns between 5" and 7" FSL? Might there be another, weaker daytime signal to test these antennas against? Does your 8" monster offer any practical advantage over the 7inch? Looking forward next to hearing relative gains with a more sensitive radio.

Thanks, Mark

--- In, D1028Gary@... wrote:

Hello All,

After requests from Marty, Mark and others, I decided to test the
relative signal boost performance of the 3", 4", 5" and 7" Medium Wave
FSL's here in a practical sort of way, that would allow each DXer to
accurately judge the relative gain provided by each loop. All four of
these newer FSL models were created in an effort to reach out to DXers
who had previously considered the antennas as too expensive or
complicated, but of course there is a tradeoff between cost and DXing
performance. Although they had been tested extensively against the Air
Core Loops, a Daytime DX Shootout was needed to see how these new
Mini-FSL's stacked up against each other.

A "Family Photo" of these four FSL models (plus their larger 8"
sibling) is posted at
showing their relative size and approximate component cost (although
this relative gain test would be conducted outdoors, with the models
well separated). During this Daytime DX Shootout the four smaller models
were tested in their relative ability to boost reception of the weak
fringe station 1670-KNRO in Redding, CA (10 kW at 435 miles) on a
barefoot Tecsun PL-380 Ultralight radio. During daytime hours this Fox
Sports station is a wispy fringe signal here, which only shows up during
prime winter conditions. The first part of each MP3 recording is the
PL-380's barefoot reception of 1670-KNRO, followed by a recording of
the boosted signal provided by each individual FSL antenna.

3" Micro-FSL (2 pounds, approximate cost $48)
Design Photo at
(barefoot PL-380 for first 18 seconds)

4" Mini-FSL (3 pounds, approximate cost $75)
Design Photo at
(barefoot PL-380 for first 17 seconds)

5" Mini-FSL (5 pounds, approximate cost $90)
Design Photo at
(barefoot PL-380 for first 20 seconds)

7" "Affordable" FSL (7 pounds, approximate cost $150)
Design Photo at
(barefoot PL-380 for first 21 seconds)

Comments: Each MP3 gives a pretty accurate picture of the ability of
each FSL to boost up fringe station reception on the PL-380. Ultralight
radios with less sensitive stock loopsticks receive a greater inductive
coupling boost from these FSL's (and from air core loops), while the
more sensitive AM-DXing portables (like the Sony ICF-S5W and the
Panasonic RF-2200) receive less of a signal boost, especially on the
smaller loops. Another Daytime DX Shootout is planned using these 4 FSL
antennas and a Sony ICF-S5W classic AM-DXing portable.

73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)

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