With the current state of the art, as exemplified by the beta testing of SCAMP, it is completely proven that monitoring of the channel can be done by machine, in order to prevent transmission on a busy channel. It doesn't even scan anything as it is able to detect any modulation in the pass band. Even a continuous carrier, even if very weak will block transmission unless the human operator intervenes. Same with other modulation types, including voice.
In some cases the detected "signal" can be an internal birdie, some odd spurs, etc. that are not a legitimate signal. The software can be adjusted for different settings to trigger only if the signals are below a certain point. There has to be the ability of the operator to make some adjustments or you might never be able to transmit. That was my experience during the beta testing. You have to take into consideration those signals that may trigger the detector if you have a wider passband and a nearby signal is affecting the software even though it is outside your signal width. Better filters will help of course but not everyone has them. I am disappointed that the ARRL did not recommend automatic detection to the requirements for both automatic and semi-automatic stations. 73, Rick, KV9U kd4e wrote: > So, I am correct that the requirement to not QRM has > not been waived, that all stations that QRM are in > violation of FCC regs, and that busy freq. detection > is an obvious solution with tons of history to prove > itself reliable. > > I do understand that apps would have to scan for a > variety of modes but that should not be difficult > given their proprietary hardware and software and > the commercial motivation to remain legal. > > Sounds like all that needs to happen is a one line > instruction from the FCC: > > "All Ham ops are reminded that all new QSO's using > any mode must not QRM existing QSO's regardless of > the mode of that QSO and the failure to do so remains > a violation risking fines and license and equipment > forfeiture." > > And perhaps a second line notifying that commercial > hardware and/or software marketed to the Ham market as > "automatic" or "unattended" must demonstrate a non- > removable capacity to meet the non-QRM requirement > via busy-frequency checking or fail in Type Approval > and that existing hardware/software must be retrofitted > or removed from the market. > > Anyone owning older equipment unable to be retrofitted > should be reminded by the FCC that they must manually > check for existing activity or be subject to QRM > action. > > Does that about cover it? ;-) > > Thanks & 73, kd4e > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
