--- [EMAIL PROTECTED] wrote: > Send wireless mailing list submissions to > [EMAIL PROTECTED] > > To subscribe or unsubscribe via the World Wide Web, > visit > http://lists.bawug.org/mailman/listinfo/wireless > or, via email, send a message with subject or body > 'help' to > [EMAIL PROTECTED] > > You can reach the person managing the list at > [EMAIL PROTECTED] > > When replying, please edit your Subject line so it > is more specific > than "Re: Contents of wireless digest..." > > > Today's Topics: > > 1. Re: Respectable SOM (Xparent) > 2. Re: privacy (was: Setting up a WISP) (David > Young) > 3. Re: RE:I have a Dream (S Woodside) > 4. Re: Satellite dish a useful antenna? (Julian > Bond) > > --__--__-- > > Message: 1 > Date: Fri, 11 Apr 2003 12:47:30 -0700 (PDT) > From: Xparent <[EMAIL PROTECTED]> > Subject: Re: [BAWUG] Respectable SOM > To: Moebius <[EMAIL PROTECTED]>, > Mike at Satel-West Radio Modems > <[EMAIL PROTECTED]>, > [EMAIL PROTECTED] > > Thanks to all for the quick responses to my SOM > question. I really appreciate it! > > I learn much from this list!! > > EN > --- Moebius <[EMAIL PROTECTED]> wrote: > > eyeball [bleck] -or- > > Ohm meter [ok] -or- > > SWR Bridge and transmitter [better] -or- > > Really expensive antenna analyzer [drool] > > > > ----- Original Message ----- > > From: "Mike at Satel-West Radio Modems" > > <[EMAIL PROTECTED]> > > To: "Jeff Liebermann" > > <[EMAIL PROTECTED]>; > > <[EMAIL PROTECTED]> > > Sent: Wednesday, April 09, 2003 5:37 PM > > Subject: Re: [BAWUG] Respectable SOM > > > > > > > BTW, if you have a tower with a bunch of > different > > antennas, open cables > > on > > > the ground: > > > How could i tell which cable is/is not connected > > to one or open at the > > > tower, without climbing the tower? > > > Mike > > > ----- Original Message ----- > > > From: "Jeff Liebermann" > > <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Sent: Tuesday, April 08, 2003 6:16 PM > > > Subject: Re: [BAWUG] Respectable SOM > > > > > > > > > > On Tue, Apr 08, 2003 at 03:49:13PM -0700, > Casey > > Halverson wrote: > > > > > 23dBm is perfect. I wouldnt have any > worries, > > it'll be up more than > > > your ISP probably ;) > > > > > > > > > > You can actually convert a SOM, link > distance, > > and frequency into an > > > availability percentage. > > > > > > > > > > Here's a good guide to follow for 2.4GHz: > > > > > > > > > > Margin 100 meters 1 kilometers 10 > > kilometers > > > > > > > > ------------------------------------------------------ > > > > > 0dBm 99.7% 62.1% > > 38.0% > > > > > 3dBm 99.8% 81.0% > > 74.0% > > > > > 6dBm 99.92% 90.5% > > 84.5% > > > > > 10dBm 99.97% 92.2% > > 95.4% > > > > > 20dBm 99.997% 99.6% > > 97.2% > > > > > 30dBm 100% 99.96% > > 99.1% > > > > > > > > > > > > >From my scribblings on the back of my > notebook: > > > > > > > > Fade margin Availability Downtime Downtime > > > > % per year per cent > > > > 8dB 90 876 hrs 10 > > > > 18dB 99 88 hrs 1 > > > > 28dB 99.9 8.8 hrs 0.1 > > > > 38dB 99.99 53 minutes 0.01 > > > > 48dB 99.999 5.3 minutes 0.001 > > > > 58dB 99.9999 32 seconds 0.0001 > > > > > > > > This assumes a perfect demodulator and a 1 > error > > bit > > > > in 10^5 BER (bit error rate) reference. > > > > > > > > I keep a 10dB, 6dB, and 3dB N-N pad in my junk > > box. > > > > When I setup a link, I add attenuators, until > > the > > > > link dies. That's my fade margin and sanity > > check. > > > > If it doesn't match the calculations, less > about > > 6dB > > > > for a "mushy" demodulator, I look for path > > obstructions, > > > > water in the coax, crappy crimps, mangled > > antennas, > > > > and defective hardware. > > > > > > > > > > > > -- > > > > # Jeff Liebermann Liebermann Design 150 > Felker > > St #D Santa Cruz CA > > > 95060 > > > > # 831.336.2558 voice 831.421.6491 > > digital_pager AE6KS > > > > # [EMAIL PROTECTED] > > http://www.LearnByDestroying.com > > > > -- > > > > general wireless list, a bawug thing > > <http://www.bawug.org/> > > > > [un]subscribe: > > http://lists.bawug.org/mailman/listinfo/wireless > > > > > > > > > > -- > > > general wireless list, a bawug thing > > <http://www.bawug.org/> > > > [un]subscribe: > > http://lists.bawug.org/mailman/listinfo/wireless > > > > > > > -- > > general wireless list, a bawug thing > > <http://www.bawug.org/> > > [un]subscribe: > http://lists.bawug.org/mailman/listinfo/wireless > > > __________________________________________________ > Do you Yahoo!? > Yahoo! Tax Center - File online, calculators, forms, > and more > http://tax.yahoo.com > > --__--__-- > > Message: 2 > Date: Fri, 11 Apr 2003 16:19:15 -0500 > From: David Young <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Subject: [BAWUG] Re: privacy (was: Setting up a > WISP) > > On Fri, Apr 11, 2003 at 02:01:54AM -0700, Raj Saxena > wrote: > > Your dialup,dsl nor cable modem are secure > either. Having a nat router > > only provides a very basic level of security. So > why would you care if your > > wireless link is secure or not? Yeah running a isp > is no joke and having > > something secure is ideal but if your customers > don't ask for it then why > > bother? dialup customers have no clue that they > are wide open on the net! > === message truncated ===
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