Exactly the reason the mode should be taken to some other band(s). 73
Bill KA8VIT > To: digitalradio@yahoogroups.com > From: [EMAIL PROTECTED] > Date: Mon, 17 Sep 2007 00:52:07 +0000 > Subject: [digitalradio] Busy Detectors > > There are down sides to busy-detection: > > 1. There is no way to know the relative interference temperature > threshold for distant co-channel users on HF. SNR at every station is > different. A signal that seems in the background at one location, for > one mode, may be interference to another mode working at a different > SNR or a different mode at another station. > > 2. What to detect? How sensitive? It is possible to engineer a > busy-detector that can be set for a very sensitive threshold, and > detect almost any mode or almost any level. That same detector will > also falsely show a busy channel most of the time on the HF ham bands. > That renders the busy-detector useless for the busy-detector user who > wants to have a QSO or send an important message. > > 3. When does the receiving station with busy-detection know whether > the content of such an incoming message is an emergency? A > too-sensitive busy detector might prevent such a message from being > run in the first place, and the result would not be good. Thus, > stations that are on the air specifically with a very likely possible > purpose of running emergency traffic should probably not use a > busy-detector. It is possible to envision a busy-detector that could > be programmed to remotely disengage upon reception of a specific > command... but such a system is not readily available at the present > time, and the use of it would certainly unnecessarily complicate the > sending of an emergency message at a critical time. > > 4. It may be counter-productive for networks or users to announce what > type of busy-detection they use or don't use, because this sort of > information can be used nefariously (has been and will be) by > individuals on purpose to maliciously interfere or thwart normal > operation. > > 5. We all know that there are many feuds and grudges out there on the > air. It seems that certain hams who are most prone to carrying on > feuds or grudge-matches may also be the same individuals who clamor > most loudly for busy-detectors to be put in place by their "enemy" :) > > > Bonnie KQ6XA > > > > > > > > > Announce your digital presence via our Interactive Sked Page at > http://www.obriensweb.com/drsked/drsked.php > > Yahoo! Groups Links > > > _________________________________________________________________ Gear up for Halo® 3 with free downloads and an exclusive offer. It’s our way of saying thanks for using Windows Live™. http://gethalo3gear.com?ocid=SeptemberWLHalo3_WLHMTxt_2
