Atari 800XL RF cable (and I/O cable availability?)

[Jules Richardson]

I picked up a little Atari 800XL bundle the other day (system, pair of 1050 
drives, and an 850 expansion box) - cheap because it was missing cables and 
power supplies.

1) When hooking this up to a TV via the RF input - is there any "magic" 
involved, or will a suitable braided co-ax TV cable with a phono connector 
added at the Atari end do?  I know it "works" because I lashed one up 
quickly (and I do mean quickly, no soldering involved) and ran the machine 
from a stray +5V PSU, which obviously resulted in a fuzzy picture - but 
then when it came to making a good one, I got to thinking about those 
little antenna switch boxes that US machines often seemed to come with, and 
wondering if there were a bunch of passive components in there which make a 
difference to the signal quality.

2) Does anyone have any spare I/O cables, or know of a source of the 
connectors so I can make my own?

(I suppose while I'm here I may as well ask if anyone just happens to know 
what voltage power supplies the 1050's and 850 need, but I'm sure I can dig 
the answers to that up online if needed)

cheers

Jules