[Fwd: LF: Loran QRM]

[Andre Kesteloot]

Walter Blanchard wrote:

> Following received from Megapulse who designed and installed the
> Lessay Loran-C transmitter :
>
> "The spec on the transmitter, as determined by the USCG
> and the USFCC, is no more than 0.5% of the radiated energy above the pass
> band of 90 to 110 kHz.  The performance of the transmitter is such that the
> approximate spectrum is -20 db at 110 kHz, -50 at 120 kHz, -70db at 130 kHz
> and -80db at 150kHz and higher.  Practical experience is that beyond about 5
> km from the stations, there is nothing received in the broadcast band.  But
> at 136 kHz I can't say what you'll find.  The spectrum remains well below 80
> db, but tends to hit peaks associated with the fine spectrum of the signal,
> which varies with the GRI, with the odd harmonics of the carrier (300 kHz
> etc) and with the antenna characteristics.  I would comment that since you
> didn't say anything of interference perchance emanating from either
> Ejde or Verlandet (as seen in Scotland) that it may be unique to Lessay, and
> therefore could be a fault in the Lessay transmitter, which is about ten
> years older than the others"
>
> I will pursue this.
>
> Walter G3JKV