Re: ARLA/CLUSTER: Novo recorde de distancia em 134 GHz alcançado no Reino Unido

[JOACHIM FOERNZLER]

Von Interesse ?

Gruss Joachim

Gesendet von meinem ASUS MeMO Pad

-------- Originalmitteilung --------
Von:"João Costa > CT1FBF" <ct1fbf  gmail.com>
Gesendet:Mon, 18 Jan 2016 14:47:18 +0100
An:Cluster-ARLA <cluster  radio-amador.net>
Betreff:ARLA/CLUSTER: Novo recorde de distancia em 134 GHz alcançado no Reino Unido

>New UK distance record on 134 GHz
>
>Ian Lamb G8KQW and John Hazell G8ACE are very pleased to report a
>successful 134GHz CW contact which extended the existing UK 134GHz
>distance record to 35.6km on Saturday 16th January 2016.
>
>This exceptional contact was made over a Line Of Sight (LOS) path from
>Chute Causeway (IO91FH20DP) near Andover to Cheesefoot Head
>(IO91JB00NV) near Winchester.
>
>The existing 19.2km UK distance record on 134GHz was set by G8KQW and
>G8ACE on September 20th 2015.
>
>Millimeter bands (24GHz and above) suffer losses due to oxygen and
>water vapour. Whilst there is nothing we can do to mitigate
>attenuation due to oxygen, the attenuation due to water vapour reduces
>in line with Dew Point Temperature (DPT) therefore operating on a very
>cold winter day would yield minimal water vapour attenuation.
>
>The key enabler for success on this extended distance record contact
>was lower path loss due to less water vapour attenuation, DPT on 16th
>January 2016 was -1c whereas on 20th September 2015 it was 14.3c. The
>reduction in water vapour attenuation between the two tests was
>sufficient to overcome the ~9db increase in free space path loss
>attenuation over the 35.6km path.
>
>Equipment used,
>
>Transmitters: ~100 microwatts output Receivers: Sub-harmonic diode
>mixers with no RF amplification
>
>Antennas: 0.3m dishes ~47dBi gain
>
>All transmitters and receivers fitted with rifle sights for visual alignment
>
>
>
>73
>Ian & John
>
>
>_______________________________________________
>CLUSTER mailing list
>CLUSTER  radio-amador.net
>http://radio-amador.net/cgi-bin/mailman/listinfo/cluster
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