On Fri, 5 Jul 2013 22:34:21 -0700, K7VE - John k7ve@k7ve.org wrote:
There were a couple of them at DCC Atlanta last year and they chewed up the 70cm band. US regulations limit to 56kbaud per carrier within 100 khz channel on 70cm. 97.307:
[snipped]
97.307 doesn't apply to FHSS or DSSS. The applicable section is 97.311.
Spread spectrum is ideal for band sharing but FCC requires records be kept.
97.311(c)(3): Maintain a record, convertible to the original information (voice, text, image, etc.) of all spread spectrum communications transmitted.
97.311(d): The transmitter power must not exceed 100 W under any circumstances. If more than 1 W is used, automatic transmitter control shall limit output power to that which is required for the communication. This shall be determined by the use of the ratio, measured at the receiver, of the received energy per user data bit (Eb) to the sum of the received power spectral densities of noise (N0) and co-channel interference (I0). Average transmitter power over 1 W shall be automatically adjusted to maintain an Eb/ (N0 + I0) ratio of no more than 23 dB at the intended receiver.
SS is allowed on all UHF bands for the entire band. The greatest impediment to development of SS in the U.S. ham community is the record keeping requirement.