The applicable FCC part is 15.101(b) which reads: Only those receivers that operate (tune) within the frequency range of 30-960 MHz and CB receivers are subject to the authorizations shown in paragraph (a)... Receivers operating above 960 MHz or below 30 MHz, except for CB recivers, are EXEMPT (emphasis added) from complying with the technical provisions (ie testing - ed) of this part but are subject to 15.5.
15.5 basically says that you have to stop operation if you cause interference to licensed services (even if you comply with the technical standards). Only if your receiver is part of a trasmitter would you end up testing the LO emissions. You'd naturally see them and compare them to the transmitter limit. If your transmitter and reciver are separate modules, you never end up testing the LO emissions at all. Since the LO is constant CW, it doen't enjoy average reduction like many transmitters and is often the highest signal observed from transcivers. I havn't heard of any plans to modify 15.101. Try a call to Ed Gibbons at the FCC lab customer service department at 301-725-1585 ex 229. Jon D. Curtis, P.E. Curtis-Straus LLC phone: (508) 486-8880 527 Great Road fax: (508) 486-8828 Littleton, MA 01460 email: [email protected] USA On Tue, 19 Nov 1996, Greg DesBrisay wrote: > > > Jim, > > Please let me know if I'm missing something, but for an intentional > radiator, I think part 15.209 "Radiated emission limits; general > requirements" applies here. Above 960 MHz the radiated emission limit > is 500 uV/m at a distance of 3 meters. For unintentional radiators > (receive-only devices for example), part 15.109 "Radiated emission > limits" states that above 960 MHz the radiated emission limit is also > 500 uV/m at 3 meters for Class B devices, or 300 uV/m at 3 meters for > Class A devices. > > Greg > > > > > Date: Mon, 18 Nov 1996 22:18:25 -0800 > > From: [email protected] (S) > > Subject: FCC 15.247 >1 GHz RX LO spec > > > > Can anyone fill me in on if/when/how FCC will regulate part 15.247 > > device incidental LO leakage for LO freqs above 1 GHz? I have heard > > rumors of something pending and would like better info. At present, LO > > > 1 GHz has a loophole in part 15 regs, similar EC and Japan regs > > require <-47 dBm LO leakage above 1 GHz. > > > > Thanx > > > > Jim >
