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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.periphs,net.dcom
Subject: Re: 9600 baud modems
Message-ID: <7249@utzoo.UUCP>
Date: Mon, 20-Oct-86 15:01:17 EDT
Article-I.D.: utzoo.7249
Posted: Mon Oct 20 15:01:17 1986
Date-Received: Mon, 20-Oct-86 15:01:17 EDT
References: <1885@bu-cs.bu-cs.BU.EDU>
Organization: U of Toronto Zoology
Lines: 19

>	2. I notice that I have more trouble if the sun is bright,
>	this is weird but night time and cloudy days I seem to have
>	little trouble...

You say you've ruled out temperature, and the sun doesn't shine directly
on the modem.  There is something else to check:  are any EPROMs (the
chips with the little glass windows, in case you're not a hardware person)
openly on view, or are the windows covered with something opaque?  Some
EPROMs are light-sensitive, in the sense that photovoltaic currents will
foul up their operation without affecting their contents.

Even if the EPROMs are all covered, it's possible that their covers are
not fully opaque.  Ordinary paper labels may not be good enough.  Try
sticking a bit of aluminum foil over each label if you're in doubt.  Or
put, say, a big cardboard box over the modem, so it's in deep shade but
still has some cooling air, and see if that helps.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,decvax,pyramid}!utzoo!henry