[Repeater-Builder] carrier drop pulse
Here is one for you guru's and BMOC problem solvers. Must admit there are a lot of good ones in this group. A 2 meter repeater 15 miles away using a Mastr2 PLL exciter emits a carrier drop pulse of about500 ms in duration on a frequency 225 khz down from the repeaters xmit freq. Unfortunately this pulse is on the output of another repeater I continuously monitor. The repeater trustee is very knowledgeable and cooperative and is attempting to solve this problem. He did say the PLL is not quite 5 volts but otherwise seems to work well.Thedrop pulse on CORis definitely coming from the exciter and can be observed on a SA with PA installed and removed.It was replaced with another exciter and the secondexciter is doing exactly the same thing. Gary K2UQ YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] carrier drop pulse
On Mon, 25 Jul 2005 [EMAIL PROTECTED] wrote: Here is one for you guru's and BMOC problem solvers. Must admit there are a lot of good ones in this group. A 2 meter repeater 15 miles away using a Mastr2 PLL exciter emits a carrier drop pulse of about 500 ms in duration on a frequency 225 khz down from the repeaters xmit freq. Unfortunately this pulse is on the output of another repeater I continuously monitor. The repeater trustee is very knowledgeable and cooperative and is attempting to solve this problem. He did say the PLL is not quite 5 volts but otherwise seems to work well. The drop pulse on COR is definitely coming from the exciter and can be observed on a SA with PA installed and removed. It was replaced with another exciter and the second exciter is doing exactly the same thing. Gary K2UQ Check to see if you aren't feeding a voltage somewhere into the exciter; it's possible that a voltage or bias on the audio inputs could be pushing it off frequency. Bring out the box of capacitors and see what you can come up with. -- Kris Kirby [EMAIL PROTECTED] BIG BROTHER IS WATCHING YOU! This message brought to you by the US Department of Homeland Security 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] carrier drop pulse
Title: Message I'd look at the comp line on the ICOM and see if it's doing anything strange when PTT drops. You'll probably need a DSO or something similiar to capture it since it's such a short duration. While you're at it, monitor the 10V line as well. Is this a converted mobile or a station? --- Jeff Jeff DePolo WN3A - [EMAIL PROTECTED]Broadcast and Communications Consultant -Original Message-From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]Sent: Monday, July 25, 2005 2:05 PMTo: Repeater-Builder@yahoogroups.comCc: [EMAIL PROTECTED]Subject: [Repeater-Builder] carrier drop pulse Here is one for you guru's and BMOC problem solvers. Must admit there are a lot of good ones in this group. A 2 meter repeater 15 miles away using a Mastr2 PLL exciter emits a carrier drop pulse of about500 ms in duration on a frequency 225 khz down from the repeaters xmit freq. Unfortunately this pulse is on the output of another repeater I continuously monitor. The repeater trustee is very knowledgeable and cooperative and is attempting to solve this problem. He did say the PLL is not quite 5 volts but otherwise seems to work well.Thedrop pulse on CORis definitely coming from the exciter and can be observed on a SA with PA installed and removed.It was replaced with another exciter and the secondexciter is doing exactly the same thing. Gary K2UQ --No virus found in this incoming message.Checked by AVG Anti-Virus.Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005 YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005
Re: [Repeater-Builder] carrier drop pulse
Thank you both for the good suggestions. It isn't my repeater. I believe its a base station. Gary YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] carrier drop pulse
One problem I saw on a converted Heathkit HW-202 repeater (not a radio I recommend - TX OK but RX horrible) was a leaky feedthru cap on the TX box that partially pulled PTT low (active). This would cause the TX to shift up several kHz every time the controller's PTT went inactive for a second or so before dropping out completely. Bob NO6B At 20:15 7/25/2005 -0400, you wrote: I'd look at the comp line on the ICOM and see if it's doing anything strange when PTT drops. You'll probably need a DSO or something similiar to capture it since it's such a short duration. While you're at it, monitor the 10V line as well. Is this a converted mobile or a station? --- Jeff Jeff DePolo WN3A - [EMAIL PROTECTED] Broadcast and Communications Consultant -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, July 25, 2005 2:05 PM To: Repeater-Builder@yahoogroups.com Cc: [EMAIL PROTECTED] Subject: [Repeater-Builder] carrier drop pulse Here is one for you guru's and BMOC problem solvers. Must admit there are a lot of good ones in this group. A 2 meter repeater 15 miles away using a Mastr2 PLL exciter emits a carrier drop pulse of about 500 ms in duration on a frequency 225 khz down from the repeaters xmit freq. Unfortunately this pulse is on the output of another repeater I continuously monitor. The repeater trustee is very knowledgeable and cooperative and is attempting to solve this problem. He did say the PLL is not quite 5 volts but otherwise seems to work well. The drop pulse on COR is definitely coming from the exciter and can be observed on a SA with PA installed and removed. It was replaced with another exciter and the second exciter is doing exactly the same thing. Gary K2UQ -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005 -- YAHOO! GROUPS LINKS * Visit your group http://groups.yahoo.com/group/Repeater-BuilderRepeater-Builder on the web. * * To unsubscribe from this group, send an email to: * mailto:[EMAIL PROTECTED][EMAIL PROTECTED] * * Your use of Yahoo! Groups is subject to the http://docs.yahoo.com/info/terms/Yahoo! Terms of Service. -- -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005 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/
