Hello Galen, You can get filters for the size of the channel you are using in the ISM band. We are buyingg them for our 900mhz systems and will begin to use them for the 2.4 equipment.
Barry Friday, August 22, 2003, 10:30:41 AM, you wrote: GM> You really need to look at the spectrum and see what you are dealing with. If you are getting interference in band (ex: a noisy telex amp on channeel 1 causing probs on ch11) a bandpass won't do GM> you any good. The only thing a bandpass will do is filter out frequencies just outside of the ism band. Say you are colo on a pcs tower (Lots of 1.9g) this can cause poor sensitivity on your GM> rx. A bandpass would be good. Cellular is roughly 800 to 900mhz. Lots of high power paging is around 900mhz. Third order harmonics are your worst nightmare. 800mhz X 3 is bingo.....2.4g. GM> Most 2.4 amps have band pass filters built in. Telex and YDI both do. You really need to identify if the problem is on your channel or near your channel. GM> Bandpass filters are great if you are colocating and have lots if noise just outside your band. You can add them to help the sensitivity of your radio. Be aware of the loss associated with GM> them. Just adding an amp does not compensate for the loss in the filter (when receiving). You are adding the filter to improve rx sense. If you nock your rx down 3db you just lost 3db of rx GM> sense regardless of how much you amp it after that. GM> Don't use a bandpass if your noise is within the 2.4ism band. It won't help. Keep in mind if you are using an amp you have already installed a bandpass. GM> ----- Original Message ----- GM> From: Kevin Summers GM> To: [EMAIL PROTECTED] GM> Sent: Thursday, August 21, 2003 11:43 PM GM> Subject: RE: [smartBridges] Playing together nicely GM> Collocating on the same tower with HAM radio, cellular, or pager equipment GM> that operates in a frequency that is close to, or is a harmonic of the 2.4GHz GM> band. I think someone mentioned on another list that some part of 900-923MHz GM> can interfere with 2.4GHz. GM> A bandpass filter will filter out ALL other frequencies except for the GM> one that you want. The Teletronics (and others for this application) allows GM> 2400-2483Mhz and effectively blocks all other frequencies. GM> Kevin Summers GM> KISTech Internet Services Inc. GM> www.kistech.com GM> -----Original Message----- GM> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Chris Chance GM> Sent: Thursday, August 21, 2003 6:42 PM GM> To: '[EMAIL PROTECTED]' GM> Subject: RE: [smartBridges] Playing together nicely GM> Someone break down to me when bandfilters are required or useful exactly? GM> ---------------------------------------------------------------------------- GM> From: Earl Campbell [mailto:[EMAIL PROTECTED] GM> Sent: Thursday, July 10, 2003 2:27 PM GM> To: [EMAIL PROTECTED] GM> His name is Sal Navidi and phone # is 602 843-0670 Home and 602 791-7042 cell. Yes I am happy with mine. Sal is a long time ham radio bud of mine. He gives ya fair prices and stands GM> behind his stuff. I dont know if he has anything right now tho. You will have to call him. GM> Earl UpHi.net GM> -------Original Message------- GM> From: [EMAIL PROTECTED] GM> Date: Thursday, August 21, 2003 08:36:12 AM GM> To: [EMAIL PROTECTED] GM> Subject: RE: [smartBridges] Playing together nicely GM> Thank you for the offer Earl... I am down south of Houston... GM> I would like to have the name/phone of your test equipment freind... Happy with that HP8559A? GM> Dave GM> -----Original Message----- GM> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Earl Campbell GM> Sent: Thursday, July 10, 2003 8:12 AM GM> To: [EMAIL PROTECTED] GM> Subject: RE: [smartBridges] Playing together nicely GM> I have a friend that deals in used test equipment. I got an HP 8559A .01 to 21 Ghz analizer for $1000.00 I'll e-mail you his phone and address if you want. GM> Earl - UpHi.net GM> PS Where are you located, I might let you use mine for a while. Helping each other is what it's all about here. GM> -------Original Message------- GM> From: [EMAIL PROTECTED] GM> Date: Thursday, August 21, 2003 07:13:22 AM GM> To: [EMAIL PROTECTED] GM> Subject: RE: [smartBridges] Playing together nicely GM> I guess one of these days I am going to need to get a spectrum analyzer... GM> anybody know of a decent SA that you can get for less than $1000? Maybe one GM> that uses a laptop/card/software? GM> Dave GM> -----Original Message----- GM> From: [EMAIL PROTECTED] GM> [mailto:[EMAIL PROTECTED] Behalf Of Lars Gaarden GM> Sent: Thursday, August 21, 2003 4:46 AM GM> To: [EMAIL PROTECTED] GM> Subject: Re: [smartBridges] Playing together nicely GM> George wrote: GM> > I wonder why if he is on channel 1 and you are on channel 11 you would GM> > have these problems? GM> > Anyone have any helpfull insight? GM> The Linksys might have bad sideband suppression and/or perhaps he is GM> using a noisy amp. Hard to tell without proper testing equipment, GM> though. GM> Dave, is it possible to change the polarity on your link? GM> -- GM> LarsG GM> The PART-15.ORG smartBridges Discussion List GM> To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe GM> smartBridges <yournickname> GM> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe GM> smartBridges) GM> Archives: http://archives.part-15.org GM> The PART-15.ORG smartBridges Discussion List GM> To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> GM> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) GM> Archives: http://archives.part-15.org GM> . GM> ____________________________________________________ GM> IncrediMail - Email has finally evolved - Click Here -- Best regards, Barry mailto:[EMAIL PROTECTED] --- [This E-mail scanned for viruses by Declude Virus] The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org
