First duplex repeater - question about duplexor/power amp
Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Steven Donegan KK6IVC General Class FCC License Silver State Car #86 www.sscc.us
Yes. The duplexor is like a tx/rx switch. If the PA is between the duplexor and the antenna, then you won't be able to receive because the signal from the antenna won't pass through the PA in reverse. Bob kk6ecm _____ From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Steven Donegan Sent: Sunday, October 04, 2015 3:17 PM To: App_rpt Mailing List Subject: [App_rpt-users] First duplex repeater - question aboutduplexor/power amp Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Steven Donegan KK6IVC General Class FCC License Silver State Car #86 www.sscc.us
You can not do that. Even if you could, how you would get a rx sig back through the amp ? While it was working ? It's the reason for the duplexer. Think about it for a few.... FULL DUPLEX We all have those moments.... ...mike/kb8jnm
Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Â Steven Donegan KK6IVC General Class FCC License Silver State Car #86 www.sscc.us_______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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Duh... oh well, that bumps the cost of the duplexor a bit... the one I was looking at was for 20 watts, the amp does 35 I believe... Steven Donegan KK6IVC General Class FCC License Silver State Car #86 www.sscc.us From: "mike@midnighteng.com" <mike@midnighteng.com> To: app_rpt-users@ohnosec.org Sent: Sunday, October 4, 2015 4:09 PM Subject: Re: [App_rpt-users] First duplex repeater - question about duplexor/power amp You can not do that. Even if you could, how you would get a rx sig back through the amp ? While it was working ? It's the reason for the duplexer. Think about it for a few.... FULL DUPLEX We all have those moments.... ...mike/kb8jnm
Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Â Steven Donegan
KK6IVC General Class FCC License Silver State Car #86 www.sscc.us_______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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You "could" use 2 antennas as long as you had enough vertical separation and not use a duplexer at all. If you're at a site with other transmitters you'll want a good filter/duplexer. On Sun, Oct 4, 2015 at 5:18 PM, Steven Donegan <donegan@donegan.org> wrote:
Duh... oh well, that bumps the cost of the duplexor a bit... the one I was looking at was for 20 watts, the amp does 35 I believe...
Steven Donegan KK6IVC General Class FCC License Silver State Car #86 www.sscc.us
------------------------------ *From:* "mike@midnighteng.com" <mike@midnighteng.com> *To:* app_rpt-users@ohnosec.org *Sent:* Sunday, October 4, 2015 4:09 PM *Subject:* Re: [App_rpt-users] First duplex repeater - question about duplexor/power amp
You can not do that.
Even if you could, how you would get a rx sig back through the amp ? While it was working ? It's the reason for the duplexer.
Think about it for a few.... FULL DUPLEX We all have those moments....
...mike/kb8jnm
Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Â Steven Donegan
KK6IVC General Class FCC License Silver State Car #86 www.sscc.us_______________________________________________
App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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Sounds like it's really a "Notchplexer".....OK for home use but thats about it. Since you have very low power your going to lose most of it in the filtering. Run 2 antennas and a single can on the RX...
------------------------------ *From:* "mike@midnighteng.com" <mike@midnighteng.com> *To:* app_rpt-users@ohnosec.org *Sent:* Sunday, October 4, 2015 4:09 PM *Subject:* Re: [App_rpt-users] First duplex repeater - question about duplexor/power amp
You can not do that.
Even if you could, how you would get a rx sig back through the amp ? While it was working ? It's the reason for the duplexer.
Think about it for a few.... FULL DUPLEX We all have those moments....
...mike/kb8jnm
Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Â Steven Donegan
KK6IVC General Class FCC License Silver State Car #86 www.sscc.us_______________________________________________
App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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Seriously??? Come on guys you can do better than this.... Turn the PA down to a power level the duplexer can handle. Make up the losses with good quality Heliax and a good gain type antenna like maybe 4 folded dipoles phased together. Or buy the right duplexer... In any case a repeater setup is easy to get wrong and cause all kinds of grief. My advice is go to repeater-builders.com and read up on how to build a repeater and what to expect. Choose your components based on what you want to do with it. If it is just going to be a toy, then build it cheap and don't expect much when it does not perform. If it is to be a viable system then get partners and spend what you need to but... Look for deals Deals are out there... On Oct 4, 2015 4:49 PM, "Kirk Just Kirk" <wb6egr@gmail.com> wrote:
Sounds like it's really a "Notchplexer".....OK for home use but thats about it. Since you have very low power your going to lose most of it in the filtering. Run 2 antennas and a single can on the RX...
------------------------------ *From:* "mike@midnighteng.com" <mike@midnighteng.com> *To:* app_rpt-users@ohnosec.org *Sent:* Sunday, October 4, 2015 4:09 PM *Subject:* Re: [App_rpt-users] First duplex repeater - question about duplexor/power amp
You can not do that.
Even if you could, how you would get a rx sig back through the amp ? While it was working ? It's the reason for the duplexer.
Think about it for a few.... FULL DUPLEX We all have those moments....
...mike/kb8jnm
Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Â Steven Donegan
KK6IVC General Class FCC License Silver State Car #86 www.sscc.us_______________________________________________
App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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participants (6)
-
Jeff Carrier -
Kirk Just Kirk -
kk6ecm -
mike＠midnighteng.com -
ronald simpson -
Steven Donegan