RE: RE : Re: [Repeater-Builder] Poor Repeater RX
The definite writeup is at http://www.brainerdham.org/Tips/CPS_to_Hz_conversion.html Mike WA6ILQ At 07:36 PM 5/21/05, you wrote: KiloHertz is the correct term! Richard, N7TGB -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of DCFluX Sent: Saturday, May 21, 2005 7:17 PM To: Repeater-Builder@yahoogroups.com Subject: Re: RE : Re: [Repeater-Builder] Poor Repeater RX Don't you mean, kiloCycles? On 5/21/05, Kevin K. Custer [EMAIL PROTECTED] wrote: --- Original Message --- From : Eric Lemmon[mailto:[EMAIL PROTECTED] Sent : 5/21/2005 4:05:15 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE : Re: [Repeater-Builder] Poor Repeater RX Alexander, The Sinclair Q-202G duplexer can barely make 85 dB when tuned on a network analyzer, so that's the major part of your desense problem. It's only a four-cavity duplexer, specified at 80 dB minimum isolation, so no amount of tuning is going to make it operate at an isolation above its design limit. While I don't disagree with what has been written, please realize that *most* commercial manufacturers 'rate' their highband/2M duplexer at 500 kiloHertz split, not 600 kiloHertz where most amateur 2 meter repeaters are operated. This added frequency separation allows for the duplexer to provide more than the stated isolation at the 500 kiloHertz specification. The Wacom WP-641 is specified at 85 dB of isolation at a 500 kiloHertz split, but provides 93 dB of isolation at 600 kiloHertz. The Sinclair Q202G is similar in its factory specifications, and isolation provided. Kevin Custer 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 the Yahoo! Terms of Service. 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: RE : Re: [Repeater-Builder] Poor Repeater RX
Don't you mean, kiloCycles? On 5/21/05, Kevin K. Custer [EMAIL PROTECTED] wrote: --- Original Message --- From : Eric Lemmon[mailto:[EMAIL PROTECTED] Sent : 5/21/2005 4:05:15 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE : Re: [Repeater-Builder] Poor Repeater RX Alexander, The Sinclair Q-202G duplexer can barely make 85 dB when tuned on a network analyzer, so that's the major part of your desense problem. It's only a four-cavity duplexer, specified at 80 dB minimum isolation, so no amount of tuning is going to make it operate at an isolation above its design limit. While I don't disagree with what has been written, please realize that *most* commercial manufacturers 'rate' their highband/2M duplexer at 500 kiloHertz split, not 600 kiloHertz where most amateur 2 meter repeaters are operated. This added frequency separation allows for the duplexer to provide more than the stated isolation at the 500 kiloHertz specification. The Wacom WP-641 is specified at 85 dB of isolation at a 500 kiloHertz split, but provides 93 dB of isolation at 600 kiloHertz. The Sinclair Q202G is similar in its factory specifications, and isolation provided. Kevin Custer 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 the Yahoo! Terms of Service. 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: RE : Re: [Repeater-Builder] Poor Repeater RX
KiloHertz is the correct term! Richard, N7TGB -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of DCFluX Sent: Saturday, May 21, 2005 7:17 PM To: Repeater-Builder@yahoogroups.com Subject: Re: RE : Re: [Repeater-Builder] Poor Repeater RX Don't you mean, kiloCycles? On 5/21/05, Kevin K. Custer [EMAIL PROTECTED] wrote: --- Original Message --- From : Eric Lemmon[mailto:[EMAIL PROTECTED] Sent : 5/21/2005 4:05:15 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE : Re: [Repeater-Builder] Poor Repeater RX Alexander, The Sinclair Q-202G duplexer can barely make 85 dB when tuned on a network analyzer, so that's the major part of your desense problem. It's only a four-cavity duplexer, specified at 80 dB minimum isolation, so no amount of tuning is going to make it operate at an isolation above its design limit. While I don't disagree with what has been written, please realize that *most* commercial manufacturers 'rate' their highband/2M duplexer at 500 kiloHertz split, not 600 kiloHertz where most amateur 2 meter repeaters are operated. This added frequency separation allows for the duplexer to provide more than the stated isolation at the 500 kiloHertz specification. The Wacom WP-641 is specified at 85 dB of isolation at a 500 kiloHertz split, but provides 93 dB of isolation at 600 kiloHertz. The Sinclair Q202G is similar in its factory specifications, and isolation provided. Kevin Custer 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 the Yahoo! Terms of Service. 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: RE : Re: [Repeater-Builder] Poor Repeater RX
I've got a kiloCycle to kiloHertz conversion table you can study. On 5/21/05, Richard [EMAIL PROTECTED] wrote: KiloHertz is the correct term! Richard, N7TGB -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of DCFluX Sent: Saturday, May 21, 2005 7:17 PM To: Repeater-Builder@yahoogroups.com Subject: Re: RE : Re: [Repeater-Builder] Poor Repeater RX Don't you mean, kiloCycles? On 5/21/05, Kevin K. Custer [EMAIL PROTECTED] wrote: --- Original Message --- From : Eric Lemmon[mailto:[EMAIL PROTECTED] Sent : 5/21/2005 4:05:15 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE : Re: [Repeater-Builder] Poor Repeater RX Alexander, The Sinclair Q-202G duplexer can barely make 85 dB when tuned on a network analyzer, so that's the major part of your desense problem. It's only a four-cavity duplexer, specified at 80 dB minimum isolation, so no amount of tuning is going to make it operate at an isolation above its design limit. While I don't disagree with what has been written, please realize that *most* commercial manufacturers 'rate' their highband/2M duplexer at 500 kiloHertz split, not 600 kiloHertz where most amateur 2 meter repeaters are operated. This added frequency separation allows for the duplexer to provide more than the stated isolation at the 500 kiloHertz specification. The Wacom WP-641 is specified at 85 dB of isolation at a 500 kiloHertz split, but provides 93 dB of isolation at 600 kiloHertz. The Sinclair Q202G is similar in its factory specifications, and isolation provided. Kevin Custer 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 the Yahoo! Terms of Service. 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/
