[Lf] [Fwd: LF: USA 136kHz proposals]

[Andre Kesteloot]

Giulio Scaroni wrote:

> John wrote:
>
> >
> > One of the reasons cited in the FCC Notice of Proposed Rulemaking is an
> > objection filed by Texas Instruments, who make "smart card" readers that
> work
> > at 121 kHz.  They're afraid hams are going to operate with such huge power
> > and with such dirty signals that we would interfere with their lucrative
> (and
> > totally unallocated) use of the LF spectrum.
> > John  KD4IDY
>
> Few hams what may do when in opposite side they have such big industry???
> Little or nothing i think, this is the reason becouse i think that very soon
> all the low band, 136 and top band may will be unusable for hams activity
> for the jamming made by all this new digital sistem, like this unallocated
> used by Texas and not only, but also from many others  company,  in LF, and
> the others like the ADSL for fast internet.
> Here, at about 500 meters or less from my house, a friend has installed a
> Texas Tiris system for car identification in a big firm.
> The equipment is the S251B that work (transmitt) at 134.2 khz, well, the
> antenna is a big few inch underground isolated loop of 27 uH, feeded direcly
> from the S251B.
> In my station not a signal from this sistem is audible, also with
> spectrogram, so absolutely not interference is produced between hams and
> this equipment, when the all two installation are well made!!!
> (The only interesting thing from this product is that Texas produce also a
> very very little TX, i dont know the power but it use two big final Fet,
> that may be used from USA hams in 136, i think without any modification,
> look on internet at "Texas Tiris")
> About the limitations in BW by FCC, i think that with 800 Hz many mode used
> in LF may be used, like slow cw, qrs, dfcw and Jason that have also more or
> less the same BW...., yes for high speed cw the better is use another band.
> For the bandplan i agree with James, bandplan in all band is ever in
> evolution, new digi modes in few years may change the cw / digital bandplan
> in all the band, and not only in cw, there are experiment also in digital
> voice, in LF here in Europe there are very little activity in digi mode, not
> so many in qrs dfcw and, i think more in aural cw in central Europe
> (loocking the PCL), so the conclusion is that our EU bandplan in LF for this
> time is good, but tomorrow we also may need to change this situation.
> Now the only problem that we can have in reception USA signals at top end of
> the band is that they are in the middle of qrs EU band, so may be better use
> for NA to EU window the segment between 137.3 to 137.4 Khz, far from
> 137.6/137.8, and near to digi band not much used here.
> Only an opinion!!
>
> 73 to all de IK2DED Giulio.