Depends on quality but anything from 6-12dB more loss per 100m at the higher frequencies, some even more than that.
I'll bear that in mind, cheers 
I might have a nice cctv job coming up in the spring on a farm.
RF not really advisable because its sat next door to a bloody big ariel (never did trust these wireless bits and bobs 
)
Looking at 4 camara's with a cable run of about 100 metres so I was looking at using baluns with one cable 
Any idea on price difference ?
Biggest difference between RG59 and PF100 cable (apart from inner conducter) is the Screening, PF100 or the **100 family is double screened, Braid and Foil, where 59 in its standard form is single, just Braid, although there are some double screen 59 variants out there, so hence as Mark say;s its all about attenuation loss vs Frequencies.
CCTV around 100m, as you say use twisted Pair, Cat 5 or 5e is a better option, the problem you may have at that distance is powering the Cameras, is the Camera Power local to it or are you planning to run the supply down one of the Cat 5 pairs, at that distance the Voltage drop can cause issues, check the Camera spec, there are some good Cameras out there that will work off dual voltage or auto sense different power sources.
Cat 5 works better than Coax at distance, due to the Transmission Line type, apart from different impedance, Coax Cable is an Unbalanced Line, where as Twisted Pair is normally Balanced, hence the need to to convert Balanced to Unbalanced (hence, Bal_un), also in the Baluns design, is to match the different impedances.
Box of Cat 5e 305 meters (1000ft) is around the 50 pound mark Trade.
Author
Topic: Quick aerial question (Read 1350 times)