Good comments! The point is there are circumstances that would make running
higher power appropriate and not necessarily excessive. I guess the gent
can speak to this, but with that much tower, considering the stated use of
remote receivers, the feedline loss, and the high transmitter power, I
wouldn't expect he was duplexing the receiver on the main transmit antenna.
It would be easier to just throw up a primary receiver and link antenna
(possibly a dual-band omni) at several-hundred feet on a second piece of
CATV line, and let the remote receivers handle the fringe areas.
Steve
________________
Kevin Custer wrote:
.750 CATV hardline has about .66 dB of loss per 100 feet at 68 degrees F at
150 mHz. If he was talking about a 2 meter repeater, 1300 feet would result
in 8.58 dB of loss at 2 meters. If he was talking about a UHF repeater,
1300 feet would result in 14.56 dB of loss.
If he's running 2M duplex, one could assume about 1.5 dB of loss in the
duplexer, add this to the 8.58 dB of loss in the cable and add 6 dB of gain
for the antenna, his ERP would be somewhere around 120 watts.
Kevin Custer
________________
Steve Grantham wrote:
This sounds wild. However, if he's running 1300' of 0.750 CATV trunk line,
his loss could be as much as 2.0 dB per 100-foot. That's 26-dB loss. Take
out say 6-db for antenna gain. This leaves him with 3-Watts ERP. If it was
1.0 dB per 100-foot, then the ERP would be about 60-Watts. I just hope he
has remote receivers in various and diverse locations around the periphery
of the transmitter site for maximum system effectiveness.
Steve
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
