What is the maximum transmitter output allowed by the FCC for radio transmitters utilizing FHSS technology (>50 hopping channels) in any of the ISM bands?
Answer(s): E
According to the study guide, in pre-08/31/00 rules, the maximum tranmitter output was 1 watt. However, in post-08/31/00 rules, the transmitter output was reduced to 125 mW, for all systems utilizing fewer than 75 hops in a sequence. Since the question asks for output for >50 hops, then I presume the answer should be 125 mW.
The number of simultaneously active co-located systems is more scalable with which spread spectrum technology?
Answer(s): A
It is clearly stated in the study guide that FHSS systems are more co-locatable than DSSS systems. Specifically you can co-locate upto 26 FHSS systems (non-synchronised), where as only 3 are allowed with DSSS systems. Thus, in this question, the answer is A (FHSS).
An advantage of DSSS over FHSS is:
Answer(s): D
An understood advantage and also one of the biggest advantages of DSSS systems over FHSS systems is greater system throughput (speed). In DSSS, speeds of upto 11 mbps can be acheived whereas FHSS only allows a max. of 2 Mbps (while simultanously operating in 802.11 compliant mode).
DSSS systems use what type of modulation when transmitting at 2 Mbps?
Answer(s): B
Narrowband RF interference will cause significant problems for implementing of which of the following technologies?
According to the study guide, FHSS systems are more resistent to Narrowband interference then DSSS systems. This is due to the agility of FHSS systems and their utilization of the entire 2.4 Ghz band (83.5 Mhz). Since HomeRF is an FHSS implementation and IrDA does not utilize RF technology, the answer should be B (DSSS).
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