Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
At 10/7/2004 02:43 PM, you wrote: >At 12:46 PM 10/7/04, you wrote: > > >Dakota Summerhawk wrote: > > > > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > > > be using two antennas. Can someone help? > > > Thanks > > > Dakota > > > >oh my...uh...the purpose of a duplexer is to combine a transmitter > >and receiver to one antenna so that they can operate simultaneously. > >Sooo, that would be a no... > >-- > >Jim Barbour > >WD8CHL > >Actually I have seen several cases where the "T-cable" in >the middle was removed and two antennas plugged in. >In some cases the RX antenna has been someone elses >with a multicoupler added. > >Mike WA6ILQ We do that here too on our 2 meter system. Allows us to use 2 antennas without much physical separation. Bob NO6B Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
Mike WA6ILQ wrote: > At 12:46 PM 10/7/04, you wrote: > > >>Dakota Summerhawk wrote: >> >>>I have a UHF R100 and need to know if I need a duplexer if I am going to >>>be using two antennas. Can someone help? >>>Thanks >>>Dakota >> >>oh my...uh...the purpose of a duplexer is to combine a transmitter >>and receiver to one antenna so that they can operate simultaneously. >>Sooo, that would be a no... >>-- >>Jim Barbour >>WD8CHL > > > Actually I have seen several cases where the "T-cable" in > the middle was removed and two antennas plugged in. > In some cases the RX antenna has been someone elses > with a multicoupler added. > > Mike WA6ILQ > Oh sure, absolutely, there's lots of other uses for duplexers, in fact our clubs UHF is setup that way, but the main purpose is combining a tx and rx onto one antenna. -- Jim Barbour WD8CHL Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
At 12:46 PM 10/7/04, you wrote: >Dakota Summerhawk wrote: > > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > > be using two antennas. Can someone help? > > Thanks > > Dakota > >oh my...uh...the purpose of a duplexer is to combine a transmitter >and receiver to one antenna so that they can operate simultaneously. >Sooo, that would be a no... >-- >Jim Barbour >WD8CHL Actually I have seen several cases where the "T-cable" in the middle was removed and two antennas plugged in. In some cases the RX antenna has been someone elses with a multicoupler added. Mike WA6ILQ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
Dakota Summerhawk wrote: > > I have a UHF R100 and need to know if I need a duplexer if I am going to > be using two antennas. Can someone help? > Thanks > Dakota > oh my...uh...the purpose of a duplexer is to combine a transmitter and receiver to one antenna so that they can operate simultaneously. Sooo, that would be a no... -- Jim Barbour WD8CHL Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
Point taken. 1/4 wave antennas are not truly isotropic. The vertical seperation can be much less if gain antennas are used however, and gain antennas give better coverage further out, which is usually a benefiet. Wade - KR7K - Original Message - From: "Tony King - W4ZT" <[EMAIL PROTECTED]> To: Sent: Monday, October 04, 2004 6:40 AM Subject: Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas? > > > >At 09:57 AM 10/2/04, Wade - KR7K wrote: > > > > >As long as you are using 1 antenna system for TX and another antenna system > > >for RX then that will work without a duplexer, if you follow a few > > >guidelines. First, you have to use gain antennas (not 1/4 waves verticals). > > >Unity gain, omni-directional antennas (like 1/4 wave verticals) radiate in > > >all directions equally and you cannot effectively isolate one from the > > >other. > > Actually, the 1/4 wave ground plane antenna doesn't radiate in all > directions equally. Instead it has quite a hole in the pattern directly > above the vertical radiator and they work quite when they're stacked one > above the other, vertically, using the top antenna for receive and mounting > it upside down. Separation should be as much as you can stand but at least > 30 feet. They've been used on repeaters for years. I've run several > repeaters without a duplexer using 1/4 wave ground planes myself. > > 73, Tony W4ZT > > >Provided you have 2 antennas with some gain, I would recommend at > > >least 9dBi, you will need enough tower or mast to vertically seperate the > > >antennas by 10 or 15 feet. If you are using yagi type antennas, the same > > >rules apply. > > > > > >Good luck > > > > > >Wade - KR7K > > > > > > > > >- Original Message - > > >From: "Dakota Summerhawk" <[EMAIL PROTECTED]> > > >To: > > >Sent: Friday, October 01, 2004 5:50 PM > > >Subject: [Repeater-Builder] Does the R100 need duplexer if using two > > >anetnnas? > > > > > > > > > > > > > > > > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > > > > be using two antennas. Can someone help? > > > > Thanks > > > > Dakota > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
>At 09:57 AM 10/2/04, Wade - KR7K wrote: > > >As long as you are using 1 antenna system for TX and another antenna system > >for RX then that will work without a duplexer, if you follow a few > >guidelines. First, you have to use gain antennas (not 1/4 waves verticals). > >Unity gain, omni-directional antennas (like 1/4 wave verticals) radiate in > >all directions equally and you cannot effectively isolate one from the > >other. Actually, the 1/4 wave ground plane antenna doesn't radiate in all directions equally. Instead it has quite a hole in the pattern directly above the vertical radiator and they work quite when they're stacked one above the other, vertically, using the top antenna for receive and mounting it upside down. Separation should be as much as you can stand but at least 30 feet. They've been used on repeaters for years. I've run several repeaters without a duplexer using 1/4 wave ground planes myself. 73, Tony W4ZT >Provided you have 2 antennas with some gain, I would recommend at > >least 9dBi, you will need enough tower or mast to vertically seperate the > >antennas by 10 or 15 feet. If you are using yagi type antennas, the same > >rules apply. > > > >Good luck > > > >Wade - KR7K > > > > > >- Original Message ----- > >From: "Dakota Summerhawk" <[EMAIL PROTECTED]> > >To: > >Sent: Friday, October 01, 2004 5:50 PM > >Subject: [Repeater-Builder] Does the R100 need duplexer if using two > >anetnnas? > > > > > > > > > > > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > > > be using two antennas. Can someone help? > > > Thanks > > > Dakota Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
This page may help: <http://www.repeater-builder.com/antenna/separation.html> Mind you, the graphs on that page are from the tube TX days, when transmitters were cleaner. You might need a little more isolation than the graphs show, but they and the text will give you some ideas. Mike WA6ILQ At 09:57 AM 10/2/04, you wrote: >As long as you are using 1 antenna system for TX and another antenna system >for RX then that will work without a duplexer, if you follow a few >guidelines. First, you have to use gain antennas (not 1/4 waves verticals). >Unity gain, omni-directional antennas (like 1/4 wave verticals) radiate in >all directions equally and you cannot effectively isolate one from the >other. Provided you have 2 antennas with some gain, I would recommend at >least 9dBi, you will need enough tower or mast to vertically seperate the >antennas by 10 or 15 feet. If you are using yagi type antennas, the same >rules apply. > >Good luck > >Wade - KR7K > > >- Original Message - >From: "Dakota Summerhawk" <[EMAIL PROTECTED]> >To: >Sent: Friday, October 01, 2004 5:50 PM >Subject: [Repeater-Builder] Does the R100 need duplexer if using two >anetnnas? > > > > > > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > > be using two antennas. Can someone help? > > Thanks > > Dakota > > > > --- > > Outgoing mail is certified Virus Free. > > Checked by AVG anti-virus system (http://www.grisoft.com). > > Version: 6.0.766 / Virus Database: 513 - Release Date: 9/17/2004 > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
Re: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
As long as you are using 1 antenna system for TX and another antenna system for RX then that will work without a duplexer, if you follow a few guidelines. First, you have to use gain antennas (not 1/4 waves verticals). Unity gain, omni-directional antennas (like 1/4 wave verticals) radiate in all directions equally and you cannot effectively isolate one from the other. Provided you have 2 antennas with some gain, I would recommend at least 9dBi, you will need enough tower or mast to vertically seperate the antennas by 10 or 15 feet. If you are using yagi type antennas, the same rules apply. Good luck Wade - KR7K - Original Message - From: "Dakota Summerhawk" <[EMAIL PROTECTED]> To: Sent: Friday, October 01, 2004 5:50 PM Subject: [Repeater-Builder] Does the R100 need duplexer if using two anetnnas? > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > be using two antennas. Can someone help? > Thanks > Dakota > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.766 / Virus Database: 513 - Release Date: 9/17/2004 > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
[Repeater-Builder] Does the R100 need duplexer if using two anetnnas?
I have a UHF R100 and need to know if I need a duplexer if I am going to be using two antennas. Can someone help? Thanks Dakota --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.766 / Virus Database: 513 - Release Date: 9/17/2004 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
