Re: [IRCA] â"Science Fiction PL-380"-- Pest Control Version

[Guy Atkins <dx@xxxxxxxxxxxxx>]

>
> âGary,
>

âI'm still puzzled as to the best way to go for nulling of pests, regarding
diameter vs length proportions. Initially the "long and skinny" antennas
such as in the SRF-T615 were praised for their nulling, but now the
"stubby" âFSLs appear to have the upper hand.

Do you think the cylindrical (hollow) design of the FSLs changes the
response to a groundwave pest station so that a high diameter-to-length
ratio *FSL* nulls better than a *solid* rod with a high LENGTH-to-diameter
ratio?

I guess this is an unfair apples to oranges comparison (hollow FSL vs
traditional solid rod antenna). To compare FSL to FSL then, are you finding
better nulling the "stubbier" you make the antennas?

Do you recall the large diameter, short rod FSLs that Kevin Schanilec built
inside of Christmas wreath containers? I wonder if those models were
excellent at nulling. I do remember that he did a lot of his testing
indoors, which can screw up nulls and reception completely. High
performance ferrite antennas CANNOT be reliably evaluated indoors!

73,

Guy Atkins
Puyallup, WA

> â
>
>
> ---------- Forwarded message ---------
> From: d1028gary@xxxxxxxxxxx
> To: Mailing list for the International Radio Club of America <
> irca@xxxxxxxxxxxxxxxx>
> Cc:
> Date: Sat, 23 Jan 2016 13:40:28 +0000 (UTC)
> Subject: [IRCA]
> ââ
> "Science Fiction PL-380"-- Pest Control Version
> Hello All,
>
> The first of the new hard-wired FSL models specifically designed to have
> an unusually sharp nulling capability is now a reality. With a "short and
> stubby" FSL design that emphasizes symmetry, isolation and a tidy RF
> reception pattern, this model can put all of my semi-locals (Seattle and
> Tacoma) down in the noise-- and even receive a few competing stations on
> their fundamental frequencies. Using 22 of the commonly available Russian
> surplus 62mm x 12mm x 4mm bars, this model is one of the "spinoff" versions
> of the 3" Bar FSL PL-380 model (for which the 15-page "Heathkit-like"
> construction article was posted at
> http://www.mediafire.com/view/w0gcek56f6aq7kr/3_Inch_FSL_Tecsun_PL.doc
>  ), and has an FSL "sensitivity score" (coil diameter x ferrite length) of
> 264-- pretty close to the 300 point score of the article version (with
> 100mm ferrite bars). The advantage of this model is that there is a huge
> supply of the Russian surplus 62mm ferrite bars, currently sold on eBay by
> two different sellers. You can get 20 of them for $13-- including shipping
> from Lithuania.
>
> Construction of this model is identical to the article version, except for
> the FSL construction (which may be added as an addendum). All of the
> construction parts are readily available, also. Unless you live practically
> next door to a local pest, this "pest control" model should cut
> your offenders way down to size. A photo of the new model is posted at
> https://app.box.com/s/5r95oxc9v24vm9hbpe2w1g800lbt4d3b
>
> 73 and Good DX,
> Gary DeBock (in Puyallup, WA, USA)
>
>
>
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