PSN-L Email List Message

Subject: Re: Hekla volcano geophone planned
From: ChrisAtUpw@.......
Date: Mon, 7 Jan 2008 22:47:10 EST


 
In a message dated 08/01/2008, dickthomas01@............. writes:

Would  something like the amateur communication system using computers here 
in the  U.S. be fast enough for you? And is it available to you? This is quite 
a bit  of automation associated with that setup now (within the  software)..



Hi Tom,
 
    Thanks for the thought. The basic problem is that  my phone is about 12 
km from the BT phone station. Even at the speed of light,  the signal delay 
would be about 40 micro seconds each way, so a transmit + ACK  would be >80 micro 
seconds assuming that the rest of the system were  infinitely fast. This 
delay severely limits the communication speeds when you  are sending single bytes. 
    That way around it is to use a system which sends a  large information 
packet. However, I can just about cope at the moment. 
 
    Regards,
 
    Chris Chapman



   





In a message dated 08/01/2008, dickthomas01@............. writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Would=20 something like the amateur communication system using computers here in th= e=20 U.S. be fast enough for you? And is it available to you? This is quite a b= it=20 of automation associated with that setup now (within the=20 software)..
Hi Tom,
 
    Thanks for the thought. The basic problem is th= at=20 my phone is about 12 km from the BT phone station. Even at the speed of ligh= t,=20 the signal delay would be about 40 micro seconds each way, so a transmit + A= CK=20 would be >80 micro seconds assuming that the rest of the system were= =20 infinitely fast. This delay severely limits the communication speeds when yo= u=20 are sending single bytes.
    That way around it is to use a system which sen= ds a=20 large information packet. However, I can just about cope at the moment.= =20
 
    Regards,
 
    Chris Chapman

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