Re: [Repeater-Builder] DB224-E antennas - question
At 3/6/2008 09:23, you wrote: >Let me start by saying that I do this kind of thing all day long for a >living. I have seen it occasionally on some commercial systems with the >same antennas. I have all TX/RX 6 cavity duplexers, and the repeaters >are Motorola (CDR or R1225 type) with circulators and line matchers if >needed. I spent a few hours at the problem site the other night and no >matter how I was trouble shooting it, it pointed to the antenna system >(beyond my polyphaser lightning protection at the ground window/entry). >This is definitely an external mix (IM) that includes my transmit >signal. The mix is strong enough that I can see it on my service >monitor inside the concrete building. No problems at all with a dummy >load, and cutting my power output to exciter only reduces but does not >eliminate the problem. I had this problem for a long time on my 440 system. There were 2 other transmitters involved, both on VHF HB & spaced 5 MHz apart. Even running split antennas with 60 ft. of vertical separation wasn't enough to lose it. The mix was in the tower itself, & could be temporarily reduced by painting over the tower joints with conductive paint. Eventually one of the TXs involved in the mix (a low power paging transmitter) went away, & I've never had any problems since. Bob NO6B
Re: Re: [Repeater-Builder] DB224-E antennas - question
James, I would think definitely not a feedline or rig problem. When you say feeds back, is there a squeal like noise. This often comes with intermod. Wish I could say more. 73, ron, n9ee/r >From: James Delancy <[EMAIL PROTECTED]> >Date: 2008/03/06 Thu PM 02:35:25 CST >To: Repeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] DB224-E antennas - question > >Both sites use Andrews 1/2 " heliax (also new when installed) and low >PIM connectors. RF is Motorola CDR repeater at one site and R1225 at >another site. > >James > >Ron Wright wrote: >> >> James, >> >> What type of feedline??? >> >> What type of rig for RF package??? >> >> 73, ron, n9ee/r >> >> >From: James Delancy <[EMAIL PROTECTED] <mailto:ctradio%40gmail.com>> >> >Date: 2008/03/06 Thu AM 11:10:14 CST >> >To: Repeater-Builder@yahoogroups.com >> <mailto:Repeater-Builder%40yahoogroups.com> >> >Subject: [Repeater-Builder] DB224-E antennas - question >> >> > >> >Just a quick question for the group. I have two repeater sites with >> >DB224-E antennas on them (ham/gov't split). One repeater site tends to >> >feed back upon itself often (duplexers, radios, cabling inside all ok >> >into dummy load, antenna SWR good). The other repeater site does this >> >occasionally. Has anyone had any experience with this problem with >> >these antennas ... and what is the fix (other than replacement). >> >Station Masters do sound like a good but expensive option though. >> > >> >Thanks! >> > >> >James >> > >> > >> >> R >> >> . >> >> > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
Re: [Repeater-Builder] DB224-E antennas - question
Both sites use Andrews 1/2 " heliax (also new when installed) and low PIM connectors. RF is Motorola CDR repeater at one site and R1225 at another site. James Ron Wright wrote: > > James, > > What type of feedline??? > > What type of rig for RF package??? > > 73, ron, n9ee/r > > >From: James Delancy <[EMAIL PROTECTED] <mailto:ctradio%40gmail.com>> > >Date: 2008/03/06 Thu AM 11:10:14 CST > >To: Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> > >Subject: [Repeater-Builder] DB224-E antennas - question > > > > >Just a quick question for the group. I have two repeater sites with > >DB224-E antennas on them (ham/gov't split). One repeater site tends to > >feed back upon itself often (duplexers, radios, cabling inside all ok > >into dummy load, antenna SWR good). The other repeater site does this > >occasionally. Has anyone had any experience with this problem with > >these antennas ... and what is the fix (other than replacement). > >Station Masters do sound like a good but expensive option though. > > > >Thanks! > > > >James > > > > > > R > > . > >
Re: [Repeater-Builder] DB224-E antennas - question
James, What type of feedline??? What type of rig for RF package??? 73, ron, n9ee/r >From: James Delancy <[EMAIL PROTECTED]> >Date: 2008/03/06 Thu AM 11:10:14 CST >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] DB224-E antennas - question > >Just a quick question for the group. I have two repeater sites with >DB224-E antennas on them (ham/gov't split). One repeater site tends to >feed back upon itself often (duplexers, radios, cabling inside all ok >into dummy load, antenna SWR good). The other repeater site does this >occasionally. Has anyone had any experience with this problem with >these antennas ... and what is the fix (other than replacement). >Station Masters do sound like a good but expensive option though. > >Thanks! > >James > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
Re: [Repeater-Builder] DB224-E antennas - question
The antennas were purchased brand new. One is about 5 years old now (2003), the other is still a baby that I got new in December 2006. The one from 2003 has been doing this quite some time, but it has not been problematic enough to drive me up a wall, but the newer one came to a head the other night when that repeater locked up my linked system plus another linked system I was connected too (and the Arcom controller was mis-behaving too ... but thats a separate issue). James Jay Urish wrote: > > Oh crap.. The "rusty bolt" problem.. > > Are the DB antennas pretty old? > > James Delancy wrote: > > > > > > Let me start by saying that I do this kind of thing all day long for a > > living. I have seen it occasionally on some commercial systems with the > > same antennas. I have all TX/RX 6 cavity duplexers, and the repeaters > > are Motorola (CDR or R1225 type) with circulators and line matchers if > > needed. I spent a few hours at the problem site the other night and no > > matter how I was trouble shooting it, it pointed to the antenna system > > (beyond my polyphaser lightning protection at the ground window/entry). > > This is definitely an external mix (IM) that includes my transmit > > signal. The mix is strong enough that I can see it on my service > > monitor inside the concrete building. No problems at all with a dummy > > load, and cutting my power output to exciter only reduces but does not > > eliminate the problem. > >. > > >
Re: [Repeater-Builder] DB224-E antennas - question
Oh crap.. The "rusty bolt" problem.. Are the DB antennas pretty old? James Delancy wrote: > > > Let me start by saying that I do this kind of thing all day long for a > living. I have seen it occasionally on some commercial systems with the > same antennas. I have all TX/RX 6 cavity duplexers, and the repeaters > are Motorola (CDR or R1225 type) with circulators and line matchers if > needed. I spent a few hours at the problem site the other night and no > matter how I was trouble shooting it, it pointed to the antenna system > (beyond my polyphaser lightning protection at the ground window/entry). > This is definitely an external mix (IM) that includes my transmit > signal. The mix is strong enough that I can see it on my service > monitor inside the concrete building. No problems at all with a dummy > load, and cutting my power output to exciter only reduces but does not > eliminate the problem. > > hope that all makes sense .. > > James > > Jay Urish wrote: > > > > It's not an antenna problem.. What duplexers are you using?? Repeaters? > > > > James Delancy wrote: > > > > > > > > > Just a quick question for the group. I have two repeater sites with > > > DB224-E antennas on them (ham/gov't split). One repeater site tends to > > > feed back upon itself often (duplexers, radios, cabling inside all ok > > > into dummy load, antenna SWR good). The other repeater site does this > > > occasionally. Has anyone had any experience with this problem with > > > these antennas ... and what is the fix (other than replacement). > > > Station Masters do sound like a good but expensive option though. > > > > > > Thanks! > > > > > > James > > > > > > > > > > -- > > Jay Urish W5GM ex. KB5VPS > > > > ARRL Life Member Denton County ARRL VEC > > N5ERS VP/Trustee > > > > Monitoring 444.850 PL-88.5 146.92 PL-110.9 > > > > > > -- Jay Urish W5GM ex. KB5VPS ARRL Life MemberDenton County ARRL VEC N5ERS VP/Trustee Monitoring 444.850 PL-88.5 146.92 PL-110.9
Re: [Repeater-Builder] DB224-E antennas - question
Let me start by saying that I do this kind of thing all day long for a living. I have seen it occasionally on some commercial systems with the same antennas. I have all TX/RX 6 cavity duplexers, and the repeaters are Motorola (CDR or R1225 type) with circulators and line matchers if needed. I spent a few hours at the problem site the other night and no matter how I was trouble shooting it, it pointed to the antenna system (beyond my polyphaser lightning protection at the ground window/entry). This is definitely an external mix (IM) that includes my transmit signal. The mix is strong enough that I can see it on my service monitor inside the concrete building. No problems at all with a dummy load, and cutting my power output to exciter only reduces but does not eliminate the problem. hope that all makes sense .. James Jay Urish wrote: > > It's not an antenna problem.. What duplexers are you using?? Repeaters? > > James Delancy wrote: > > > > > > Just a quick question for the group. I have two repeater sites with > > DB224-E antennas on them (ham/gov't split). One repeater site tends to > > feed back upon itself often (duplexers, radios, cabling inside all ok > > into dummy load, antenna SWR good). The other repeater site does this > > occasionally. Has anyone had any experience with this problem with > > these antennas ... and what is the fix (other than replacement). > > Station Masters do sound like a good but expensive option though. > > > > Thanks! > > > > James > > > > > > -- > Jay Urish W5GM ex. KB5VPS > > ARRL Life Member Denton County ARRL VEC > N5ERS VP/Trustee > > Monitoring 444.850 PL-88.5 146.92 PL-110.9 > >
Re: [Repeater-Builder] DB224-E antennas - question
It's not an antenna problem.. What duplexers are you using?? Repeaters? James Delancy wrote: > > > Just a quick question for the group. I have two repeater sites with > DB224-E antennas on them (ham/gov't split). One repeater site tends to > feed back upon itself often (duplexers, radios, cabling inside all ok > into dummy load, antenna SWR good). The other repeater site does this > occasionally. Has anyone had any experience with this problem with > these antennas ... and what is the fix (other than replacement). > Station Masters do sound like a good but expensive option though. > > Thanks! > > James > > -- Jay Urish W5GM ex. KB5VPS ARRL Life MemberDenton County ARRL VEC N5ERS VP/Trustee Monitoring 444.850 PL-88.5 146.92 PL-110.9
[Repeater-Builder] DB224-E antennas - question
Just a quick question for the group. I have two repeater sites with DB224-E antennas on them (ham/gov't split). One repeater site tends to feed back upon itself often (duplexers, radios, cabling inside all ok into dummy load, antenna SWR good). The other repeater site does this occasionally. Has anyone had any experience with this problem with these antennas ... and what is the fix (other than replacement). Station Masters do sound like a good but expensive option though. Thanks! James
Re: [Repeater-Builder] DB224-E Data
Doug Thanks for the DB224E drawings. You have done a very good job in measuring everything and putting it in a form even I can understand. DB224 commercial antennas are available here for about $25. Thanks again. 73's de Tom Manning, AF4UG - Original Message - From: Bruce Forestal To: Repeater-Builder@yahoogroups.com Sent: Monday, December 12, 2005 11:05 PM Subject: Re: [Repeater-Builder] DB224-E Data Doug, Thanks for the DB224E data, your document is outstanding and I appreciate your time spent getting the details in a PDF. Bruce WB6ARE On Dec 12, 2005, at 9:05 PM, Doug Zastrow wrote: To All I Promised this Info, My DB224-E sketch will be on its way to your inbox tonight. If you don't have it by morning email me direct at dzastrow -at- qwest -dot- net. I'm also forwarding a copy to Mike Morris who several months back graciously offered to review it and post it to the Repeater Builder web site. It's quite ironic in that the antenna I documented went aloft to 310 ft. today. It replaced an old DB224 which had developed a crackling noise when in duplex operation. The culprit was a winch line burn going halfway through the phasing harness as well as a cracked dipole. (Pics below.) My apologies for the sketch delay. I have been working 60-80 hour weeks the past three months and I put sleep ahead of completing the sketch. Hope it fills everyone's needs. Regards, Doug Zastrow, WBØUPJ Elkhorn Valley ARC Norfolk, Nebraska (Highly compressed and reduced pics as a courtesy to lo bandwidth users.) Winch Line Burn <01c901c5ff92$18738860$6401a8c0> Dipole Crack <01ca01c5ff92$18738860$6401a8c0> 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. 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] DB224-E Data
Does anyone have a used DB224 available for sale or know a dealer w/ a good price? 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] DB224-E Data
Doug,Thanks for the DB224E data, your document is outstanding and I appreciate your time spent getting the details in a PDF.Bruce WB6AREOn Dec 12, 2005, at 9:05 PM, Doug Zastrow wrote:To All I Promised this Info, My DB224-E sketch will be on its way to your inbox tonight. If you don't have it by morning email me direct at dzastrow -at- qwest -dot- net. I'm also forwarding a copy to Mike Morris who several months back graciously offered to review it and post it to the Repeater Builder web site. It's quite ironic in that the antenna I documented went aloft to 310 ft. today. It replaced an old DB224 which had developed a crackling noise when in duplex operation. The culprit was a winch line burn going halfway through the phasing harness as well as a cracked dipole. (Pics below.) My apologies for the sketch delay. I have been working 60-80 hour weeks the past three months and I put sleep ahead of completing the sketch. Hope it fills everyone's needs. Regards, Doug Zastrow, WBØUPJElkhorn Valley ARCNorfolk, Nebraska (Highly compressed and reduced picsas a courtesy to lo bandwidth users.) Winch Line Burn <01c901c5ff92$18738860$6401a8c0> Dipole Crack <01ca01c5ff92$18738860$6401a8c0>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. 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.
[Repeater-Builder] DB224-E Data
To All I Promised this Info, My DB224-E sketch will be on its way to your inbox tonight. If you don't have it by morning email me direct at dzastrow -at- qwest -dot- net. I'm also forwarding a copy to Mike Morris who several months back graciously offered to review it and post it to the Repeater Builder web site. It's quite ironic in that the antenna I documented went aloft to 310 ft. today. It replaced an old DB224 which had developed a crackling noise when in duplex operation. The culprit was a winch line burn going halfway through the phasing harness as well as a cracked dipole. (Pics below.) My apologies for the sketch delay. I have been working 60-80 hour weeks the past three months and I put sleep ahead of completing the sketch. Hope it fills everyone's needs. Regards, Doug Zastrow, WBØUPJ Elkhorn Valley ARC Norfolk, Nebraska (Highly compressed and reduced pics as a courtesy to lo bandwidth users.) Winch Line Burn Dipole Crack 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] DB224 E
Over the years DB has changed a few things as they changed the harness. You mite want to check with one of the DB dealers and get the numbers off the antenna before you call they can help you real quick on the phone. They have me. 73 Russ, > What is the overall length of the dipole on a 224E? I thing it is 37 > inches but cant remember for sure. > > Thanks, Dale K0JXI 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] DB224 E
What is the overall length of the dipole on a 224E? I thing it is 37 inches but cant remember for sure. Thanks, Dale K0JXI 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/
