On Sat, Jul 6, 2013 at 10:02 AM, Geoff Joy geoff@windowmeister.com wrote:
(Please trim inclusions from previous messages) _______________________________________________ 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. -- Geoff Joy - ke6qh - AmprNet IP Address Coordinator for San Bernardino & Riverside Counties. geoff@windomeister.com
What kind of records need be kept though? It would seem to me that for
802.11 type stuff the needed records would be minimal such as the KEY and SSID. Note intent is a major piece here as some would argue that using a key is cryptography and cryptography is not allowed. The difference here is one of intent. If you offer to make the key available on a need to know basis (i.e. The FCC to be rules compliant, and the amateur community that wants to connect) I could even go as far as agreeing that cryptography is being used but it's being used for authentication not obfuscation which is what the FCC is concerned about. In our case Authentication is a good thing as we would not want just any non amateur with WiFi gear hopping on our network. I do not think we need to log all the actual traffic, only have records enough to turn the recieved bitstream into something usable for monitoring and enforcement.
Eric AF6EP