Carl R. Stevenson wrote:




S9+10 on a VERY short whip (an "Outbacker Joey") is a pretty huge
signal to me ... with BPL proposing to go up to 80 MHz, I would
think that the FM broadcast band is at relatively low risk, though FM
receivers could experience some degree of "desense" if the BPL
signal at the front end was strong enough due to proximity.

TV channels 2, 3, 4, and 5 will get clobbered by the junk going up to 80MHz.
The video signal is AM modulated onto the channel carrier (with a
portion of the
lower sideband suppressed) and will have no ability to reject the BPL
noise.
The effect would be somewhat similar to a sparky vacuum cleaner motor
throwing
white and black spots throuout the picture. The sound, being FM, will fare
better. Well, there's digital HDTV, but most everyone still uses analog TV.
And I don't get cable or satellite.

TV channels 2, 3, 4, and 5 will get clobbered by the junk going up to 80MHz.
The video signal is AM modulated onto the channel carrier (with a
portion of the
lower sideband suppressed) and will have no ability to reject the BPL
noise.
The effect would be somewhat similar to a sparky vacuum cleaner motor
throwing
white and black spots throuout the picture. The sound, being FM, will fare
better. Well, there's digital HDTV, but most everyone still uses analog TV.
And I don't get cable or satellite.

2 to 80 MHz is the spectrum that the BPL folks asked to try in their
experimental license applications. I have not seen any BPL above 50 MHz -- so
far.

And at the levels I have seen BPL, digital TV won't help. The digital TV
demodulation process can ignore noise up to a point. An analog TV signal that
was somewhat noisy, but perfectly watchable, would probably be clean on
digital. An analog signal that was noisy, but still just watchable would have
many digital errors that would result in portions of the screen locking up for
a few seconds at a time, loss of audio for seconds, etc. And just a little bit
past that point, the digital TV signal would fall apart all together.

73,
Ed Hare, W1RFI

http://www.rochesterdandc.com/biznew...business.shtml

Not a lot of hard info here, but politics in action.

Most of this discussion on BPL focuses on the impact of
BPL on HF reception. What would 1500w of continuous RTTY
do to the users of BPL? How would a BPL modem, which is
necessarily wideband cope with gross overload?

Tom - N1MM
Check out the N1MM Free Contest Logger at:
http://www.n1mm.com
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On Sat, 18 Oct 2003 13:35:06 GMT, "Tom Wagner"
wrote:

Most of this discussion on BPL focuses on the impact of
BPL on HF reception. What would 1500w of continuous RTTY
do to the users of BPL? How would a BPL modem, which is
necessarily wideband cope with gross overload?

It'll turn a "deaf ear" to the RTTY...rather it'll just go deaf if you
are close enough.

Roger Halstead (K8RI EN73 & ARRL Life Member)
www.rogerhalstead.com
N833R World's oldest Debonair? (S# CD-2)

Tom - N1MM
Check out the N1MM Free Contest Logger at:
http://www.n1mm.com
http://groups.yahoo.com/group/N1MMLogger/