6 Jul
2013
6 Jul
'13
12:02 p.m.
On Fri, 5 Jul 2013 22:34:21 -0700, K7VE - John <k7ve(a)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.
--
Geoff Joy - ke6qh -
AmprNet IP Address Coordinator for San Bernardino & Riverside Counties.
geoff(a)windomeister.com