Greetings!! I'm looking for advice and any experience from the group regarding spread spectrum testing.
I'm applying RSS-210 for Canadian requirements (License exempt RF Devices...), and looking at the 900-928 and 2400-2483 MHz S.S. bands for Direct Sequencing systems. A couple of the things that seem a little odd in making these measurements are (directly quoting the standard): > 6.2.2.b.2 > The processing gain (PG) shall be at least 10 dB. This may be determined > from any suitable method including from the jamming margin (JM) as follows: > PG = JM + S/N + L , where S/N is the signal to noise ratio at the > information output and L is the system implementation loss. The jamming > margin > of a receiver is the minimum carrier-to-interference ratio > (interference to be a single frequency) to meet a specified bit error > ratio at the output of the receiver. The test report shall indicate how the > processing gain is determined. Have you ever tried this, and will a simple unmodulated variable amplitude signal sent from a directly connected (through a splitter??) Signal Generator/Amp work for the interference signal. If not, how would the interference signal of a known amplitude be coupled into the receiver. Any ideas on how else to obtain this measurement? Also, is the system implementation loss simply the reflected power? > 6.2.2.b.3 > The peak output power of the transmitter shall not exceed one watt. Any > antenna gain in excess of 6 dBi (6 dB above isotropic gain) shall be added to > the > measured RF output power before using the power limits. What is a suitable means to get an accurate antenna gain reading, presumably for the transmitting bands only. Also, the one watt, peak power, I assume is the total available power at the antenna jack, or could it be the total forward power when connected to the antenna? Thanks to anyone that can get back to me on this! Best regards, Rob. Protocol Labs ph 604 218 1762 fx 604 572 9408 --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
