Re: Can I do this?

msg <msg@xxxxxxxxxxxxxxxxx> hath wroth:

Jeff Liebermann wrote:

ab8yy <ab8yy.33z9d7@xxxxxxxxxxxxxxxxxxxxxxxx> hath wroth:


<snip>

I cannot hardwire to my radio
shack/garage due to distance.


Sure you can. There's data over phone lines, power lines, and CATV
coax. HomePNA, HomePlug, etc.


Sorry Jeff, data over unshielded cables to a radio shack is an
anathema to a ham or swl (QRN).

I beg to differ. There's a big difference between BPL and HomePlug
even though they use similar technology. Outdoor power lines are
widely spaced and cannot really be considered a "twisted pair". CMRR
(common mode rejection ration) sucks and the power lines radiate. The
power used by the xmitters are also quite a bit higher than the home
version.

However, in the home, the power lines are much closer together and are
a better approximation of a twisted pair. They radiate considerably
less. Note that HomePlug really does meet -52dBm/Hz FCC transmit
power density limitations. That's about 50mw spread between 4-20MHz.
Some models even have notch filters in the ham bands.
<http://www.sonic.net/~n6gn/netgear_modem_P1-1.pdf>
<http://p1k.arrl.org/~ehare/rfi/homeplug/HomePlug_ARRL.pdf>
<http://en.wikipedia.org/wiki/Homeplug>

I've done some sniffing around various hams houses trying to find the
sources of QRN (noise). In most cases, it's noisy switching power
supplies (i.e. cell phone chargers), laptop chargers, plasma TV's, and
computahs. Although several hams had HomePlug 1.0 systems, there was
no evidence that they were causing any QRN. Incidentally, an Icom
IC-756 Pro II transceiver showed the presence of HomePlug RFI on the
spectrum display, but it was barely noticeable.

I've done little with HomePNA (phone line networking). MoCA and other
forms of CATV networking is safe because the coax is shielded.



--
Jeff Liebermann jeffl@xxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

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