Re: [Repeater-Builder] ARR UHF GaAsFET - free, not working
Jeff, If you still have the Micor stuff I will be glad to take it off your hands. Send me a direct e-mail and we can work out the finer details. Milt N3LTQ - Original Message - From: 'Jeff DePolo' j...@broadsci.com To: Repeater-Builder@yahoogroups.com Sent: Sunday, June 28, 2009 1:33 PM Subject: [Repeater-Builder] ARR UHF GaAsFET - free, not working I pulled out an ARR P432VDG GaAsFET preamp today, it's no longer working. Anyone want it? I've standardized on Angle Linear; this ARR is one of the few I still have in service and I have no interest in getting it repaired.. If you want it, call ARR and get an RMA number for the repair on Monday and I'll ship it to them to repair, and then they can ship it back to you to save on shipping costs. First reply gets it. Please reply *to the list* so everyone else sees that it's spoken for. Also, if anyone wants any, I have boxes full of mobile Micor UHF parts that I'm going to chuck. Mostly exciters (regular and wide-spaced), audio/squelch boards, PL boards, cover shields, etc. No receivers or PL reeds. U pay shipping. --- Jeff WN3A Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.12.94/2207 - Release Date: 06/28/09 17:54:00
RE: [Repeater-Builder] Re: Pass-Notch Duplexer Woes
Looks like there is 2 dB loss at a 600 khz + spacing (which is where the problems were). (all 4 cans = 2dB) 2 dB is fine for 4 cavities per side. If you are able to get under 2.5 dB for those 4 cavities when retuned on 2m, I'd say you're doing pretty well. What about the links inside the cans? I have a set of drawings for a lower freq range, but wasn't sure what that would buy for me. Can I just disconnect the link from the SO-239 center conductor add some copper stock to make it longer (making sure the flat area gets longer)? The loops shouldn't require modification. Are the loops rotatable on this unit? Also, will the can's interconnect cables be an issue? They are about 9-10 currently. Yes, they will likely need to be scaled, but before you go through all of that work, try it without redoing the harness and see what you get. You can also add elbow adapters or connector savers at strategic locations to lengthen the cables slightly, at least for testing, to see if it makes an improvement. --- Jeff WN3A
[Repeater-Builder] 432 converter
Can't remember if I asked this here, but still looking. Does anybody have a Hamtronics 440 receiving converter, dead or alive, built or still in kit form laying around? Please contact me at w4...@arrl.net Thanks. Charlie in NC
[Repeater-Builder] Echoing
Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
Re: [Repeater-Builder] Echoing
Can you define and describe what you mean by echoing? I've not heard that term used with regard to a repeater. Might be a regional usage? Thanks, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@hotmail.com wrote: From: Michael J.Talkington kc8...@hotmail.com Subject: [Repeater-Builder] Echoing To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 9:27 AM Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
Re: [Repeater-Builder] 432 converter
Charlie, I have a completed one, along with the TX converter and a 10w, (might be 20) amp. Do you need info or are you looking to purchase? Regards, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, CL in NC mjca...@yahoo.com wrote: From: CL in NC mjca...@yahoo.com Subject: [Repeater-Builder] 432 converter To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 9:03 AM Can't remember if I asked this here, but still looking. Does anybody have a Hamtronics 440 receiving converter, dead or alive, built or still in kit form laying around? Please contact me at w4...@arrl.net Thanks. Charlie in NC
RE: [Repeater-Builder] Re: Help with Duplexer
Clairification - only one cavity connections was described, four cavities were required for the DB HB duplexer. I regret the misinformation. Allan Crites WA9ZZU --- On Sun, 6/28/09, wa9...@arrl.net wa9...@arrl.net wrote: From: wa9...@arrl.net wa9...@arrl.net Subject: RE: [Repeater-Builder] Re: Help with Duplexer To: Repeater-Builder@yahoogroups.com Date: Sunday, June 28, 2009, 11:43 PM Eric: I wonder if you are aware that any BP two loop cavity can be made into a BP/BR cavity by using only one of the 2 loops, having a coaxial T connector on the loop, with a tuning capacitor (in the form of a O.C. transmission line) connected to one side of the T and on the other side a 1/4 W.L. transmission line connecting to a T connector on the main line. The tuning capacitance parallel resonates the loop inductance for the notch freq. and the cavity is tuned for the pass freq. This was an original Sinclair design. I view having a tuning cap in series internally with the loop as a cost reduced version and probably better performing. Several years ago DB made a BP/BR duplexer for Motorola on HB by using a BP 2 loop cavity with a coaxial T connector on both loops, one side of the input T was connected with a 1/4 W.L. coax to a jct box containing a variable air cap series connected to the cc of the one coax and to the cc of another 1/4 W.L. coax which connected to the output T. The cavity tuned the BP freq., and the air variable tuned the notch. 73 WA9ZZU --- On Sun, 6/28/09, Eric Lemmon wb6...@verizon. net wrote: From: Eric Lemmon wb6...@verizon. net Subject: RE: [Repeater-Builder] Re: Help with Duplexer To: Repeater-Builder@ yahoogroups. com Date: Sunday, June 28, 2009, 10:44 PM Ron, Your Q202G must be an earlier version, with a different method of adjusting the notch. A Sinclair bandpass cavity uses two loops, so the cavities you have are not bandpass. A photo would be helpful. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of n4sfu Sent: Sunday, June 28, 2009 6:39 PM To: Repeater-Builder@ yahoogroups. com Subject: [Repeater-Builder] Re: Help with Duplexer Eric, Thanks for the reply. The Sinclair Q202G duplexers that I have do not have the tiny threaded cap next to the loop connector. 1 set of cans are labeled as High pass while the other set is marked as Low pass. I did notice a plate on top of all 4 cans that has noting going to it but cannot fing anything else that shows it can be changed other than the tuning rod. I do currently have these tuned at 146.715/146. 115. 73 Ron Hill N4SFU --- In Repeater-Builder@ yahoogroups. com mailto:Repeater- Builder%40yahoog roups.com , Eric Lemmon wb6...@... wrote: Ron, If you really have a Q202G (I'm guessing that Q020G was a typo) cavity set, they are not bandpass. What suggests that they are bandpass? The standard Q202G BpBr duplexer has only one loop per can, and a blank plate is installed where a second loop would be. A tiny threaded cap next to each loop connector covers the notch adjustment. Be aware that a Q202G duplexer that was in commercial service will probably have the high-split harness that measures about 12 between the centers of each tee, and will not tune down to the 2m band. The harness drawing is found here: www.repeater- builder.com/ sinclair/ sinclair- q202-g-cable- harness.pdf 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@ yahoogroups. com mailto:Repeater- Builder%40yahoog roups.com [mailto:Repeater-Builder@ yahoogroups. com mailto:Repeater- Builder%40yahoog roups.com ] On Behalf Of n4sfu Sent: Saturday, June 27, 2009 7:13 PM To: Repeater-Builder@ yahoogroups. com mailto:Repeater- Builder%40yahoog roups.com Subject: [Repeater-Builder] Help with Duplexer I dont usually post on the forum but rcv the emails everyday and follow all posts. I recently purchased a 4 can set of Sinclair Q020G cavities not knowing until I had them tuned and connected to the MSR2000 that they are Bandpass only. Needless to say that desense will not permit the rcv of weak signals at all say 5 miles away. Does anyone know of a good place to acquire a couple of the notch cavities with the cables to go with this set or of a good set of BP/BR cavities at a reasonable price to complete this repeater installation. We are located in South GA and are locating this repeaer on 146.715 mhz. All help is appreciated. Ron/N4SFU
Re: [Repeater-Builder] Echoing
I suspect the controller has an audio delay board and a user had another radio listening to the repeater in the background - that causes an echo. Chuck WB2EDV - Original Message - From: Michael J.Talkington kc8...@hotmail.com To: Repeater-Builder@yahoogroups.com Sent: Monday, June 29, 2009 9:27 AM Subject: [Repeater-Builder] Echoing Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD Yahoo! Groups Links
Re: [Repeater-Builder] DC Ground Lightning Protection on antenna????
A fiberglass antenna will probably not survive a lightning strike, no matter what you do with grounding. What you really want to do is protect the remaining equipment. I suggest you go to http://www.repeater-builder.com/rbtip/ and start reading up. There's a ton of info there - including grounding. Chuck WB2EDV - Original Message - From: agrimm0034 agrimm0...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Monday, June 29, 2009 12:34 AM Subject: [Repeater-Builder] DC Ground Lightning Protection on antenna I bought a nice looking RFS Celwave antenna to use on 462.600 Specs are DC ground for lightning protection but is there something I need to do to make sure it is protected? It sits on 3 legged tower 40 ft up and the tower is mounted on the side of a structure. It sets on 3 pieces of galvanized pipe that are set in concrete. Overall the tower is grounded just not as good as what I could make it be. If I ran a grounding rod into the ground and ran #8 or heavier wire to the tower would I just be wasting my time to protect the antenna or what should I do to make sure everything is protected ok. Thanks
RE: [Repeater-Builder] Echoing
Unless he is talking about some mixing of some sore due to a spur..I had such a problem this past spring. Did not know how to describe it but echoing sort of covers it. We retuned the transmitter and all seems fine now. .just in case he has the same thing going on. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Monday, June 29, 2009 12:26 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Echoing I suspect the controller has an audio delay board and a user had another radio listening to the repeater in the background - that causes an echo. Chuck WB2EDV - Original Message - From: Michael J.Talkington kc8...@hotmail.com mailto:kc8fwd%40hotmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, June 29, 2009 9:27 AM Subject: [Repeater-Builder] Echoing Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD Yahoo! Groups Links __ NOD32 4196 (20090629) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure
On my exec II receiver, the casting is just screwed together. Correct? Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Friday, June 26, 2009 9:00 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure Chuck's got you going down the right path. At 51 MHz, you probably only have to take one turn off of each of the first two coils. At 52 MHz or higher, you might have to take off two. You need a lot of heat to get the casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut it). Removing the coils/caps once you have the casting apart is pretty straightfoward, as is removing one turn from each. It's not that bad of a job once you've done one or two, but the first one may cause you some grief. You should find that after the mods the receiver is plenty hot and should easily beat spec by a few dB. The LO/multiplier stages don't require any mods. If you want to cut corners, you might first see what your effective sensitivity is at your repeater site on 6m. You may find that the noise floor is elevated substantially, and that getting the bench sensitivity down from 1 uV to 0.3 uV isn't going to make a damned bit of difference in the real world. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Friday, June 26, 2009 4:16 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure You are correct sir, no mesh. Isn't that that pits. So I take it I'll be removing some windings from the underside of said trimmer caps? Or is there an easier route to sensitivity? =] Chris, Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Friday, June 26, 2009 12:09 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MastrII Receiver Failure Do the two front end trimmer caps still have some mesh left, or are they at minimum capacitance? That may be your problem. Chuck WB2EDV - Original Message - From: Chris Curtis demo...@rollanet.org mailto:demoman%40rollanet.org To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, June 26, 2009 10:45 AM Subject: RE: [Repeater-Builder] MastrII Receiver Failure I have a mastr EXEC II receiver (33 split) that I can't get sensitivity to increase. I replaced the fet as outlined below on the mastr II query. No joy though. I'm using an am/fm-1200s to tune the receiver. .5~1uv is where the receiver is coming to life. I have a couple vhf and uhf exec II receivers that tuned up nicely in the .19~.2uv range so I think I'm doing/reading it correctly. Original freq was in the 46~49mHz range. Current crystal (icom sent to and received from Bomar) on 51.75mHz. Any tips/hints/tricks to get a little more sensitivity? Thanks for the bandwidth! Chris Kb0wlf No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.85/2193 - Release Date: 06/26/09 05:53:00 Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.12.83/2191 - Release Date: 06/26/09 05:53:00
RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure
As I recall, there's a plate on the bottom of the casting to which the first two coils (associated with C301 and C302) were mounted using screws. There may be other screws also attaching that plate to the chassis. On some units the plate is soldered around the perimeter to the casing, on some it isn't. Even if yours isn't soldered, you'll still need a lot of heat to un-solder the coils/caps from the casting (soldered at the top at the cap, and at the bottom at the cold side of the coils). You want to remove turns off the top side of the coil - the coils are tapped near the bottom and you don't want to alter that. I have a big 175 watt Weller pencil iron that has a lot of mass that works great for stuff like this. Google Weller SP175. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Monday, June 29, 2009 2:42 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure On my exec II receiver, the casting is just screwed together. Correct? Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Friday, June 26, 2009 9:00 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure Chuck's got you going down the right path. At 51 MHz, you probably only have to take one turn off of each of the first two coils. At 52 MHz or higher, you might have to take off two. You need a lot of heat to get the casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut it). Removing the coils/caps once you have the casting apart is pretty straightfoward, as is removing one turn from each. It's not that bad of a job once you've done one or two, but the first one may cause you some grief. You should find that after the mods the receiver is plenty hot and should easily beat spec by a few dB. The LO/multiplier stages don't require any mods. If you want to cut corners, you might first see what your effective sensitivity is at your repeater site on 6m. You may find that the noise floor is elevated substantially, and that getting the bench sensitivity down from 1 uV to 0.3 uV isn't going to make a damned bit of difference in the real world. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chris Curtis Sent: Friday, June 26, 2009 4:16 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure You are correct sir, no mesh. Isn't that that pits. So I take it I'll be removing some windings from the underside of said trimmer caps? Or is there an easier route to sensitivity? =] Chris, Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Friday, June 26, 2009 12:09 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MastrII Receiver Failure Do the two front end trimmer caps still have some mesh left, or are they at minimum capacitance? That may be your problem. Chuck WB2EDV - Original Message - From: Chris Curtis demo...@rollanet.org mailto:demoman%40rollanet.org mailto:demoman%40rollanet.org To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, June 26, 2009 10:45 AM Subject: RE: [Repeater-Builder] MastrII Receiver Failure I have a mastr EXEC II receiver (33 split) that I can't get sensitivity to increase. I replaced the fet as outlined below on the mastr II query. No joy though. I'm using an am/fm-1200s to tune the receiver. .5~1uv is where the receiver is coming to life. I have a couple vhf and uhf exec II receivers that tuned up nicely in the .19~.2uv range so I think I'm doing/reading it correctly. Original freq was in the 46~49mHz range. Current crystal (icom sent to and received
RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure
Yes, be careful not to strip any screws when you try to get the back/bottom open. He was saying it takes allot of heat to get the helical coil unsoldered from the side of the casting (once you have it open you will see). I have used a propane torch setting stationary on a bench while holding the casting in one hand and a pair of needle nose in the other, I hold that joint in the heat till it flows or till I had to put on a glove or drop the casting hihi. Don Kirchner W5DK -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Monday, June 29, 2009 1:42 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure On my exec II receiver, the casting is just screwed together. Correct? Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Friday, June 26, 2009 9:00 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure Chuck's got you going down the right path. At 51 MHz, you probably only have to take one turn off of each of the first two coils. At 52 MHz or higher, you might have to take off two. You need a lot of heat to get the casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut it). Removing the coils/caps once you have the casting apart is pretty straightfoward, as is removing one turn from each. It's not that bad of a job once you've done one or two, but the first one may cause you some grief. You should find that after the mods the receiver is plenty hot and should easily beat spec by a few dB. The LO/multiplier stages don't require any mods. If you want to cut corners, you might first see what your effective sensitivity is at your repeater site on 6m. You may find that the noise floor is elevated substantially, and that getting the bench sensitivity down from 1 uV to 0.3 uV isn't going to make a damned bit of difference in the real world. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Friday, June 26, 2009 4:16 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure You are correct sir, no mesh. Isn't that that pits. So I take it I'll be removing some windings from the underside of said trimmer caps? Or is there an easier route to sensitivity? =] Chris, Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Friday, June 26, 2009 12:09 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MastrII Receiver Failure Do the two front end trimmer caps still have some mesh left, or are they at minimum capacitance? That may be your problem. Chuck WB2EDV - Original Message - From: Chris Curtis demo...@rollanet.org mailto:demoman%40rollanet.org To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, June 26, 2009 10:45 AM Subject: RE: [Repeater-Builder] MastrII Receiver Failure I have a mastr EXEC II receiver (33 split) that I can't get sensitivity to increase. I replaced the fet as outlined below on the mastr II query. No joy though. I'm using an am/fm-1200s to tune the receiver. .5~1uv is where the receiver is coming to life. I have a couple vhf and uhf exec II receivers that tuned up nicely in the .19~.2uv range so I think I'm doing/reading it correctly. Original freq was in the 46~49mHz range. Current crystal (icom sent to and received from Bomar) on 51.75mHz. Any tips/hints/tricks to get a little more sensitivity? Thanks for the bandwidth! Chris Kb0wlf No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.85/2193 - Release Date: 06/26/09 05:53:00 Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.12.83/2191 - Release Date: 06/26/09 05:53:00 Yahoo! Groups Links
RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure
Yes, I have the coils out already. Was just touching base about the entire casting. I have a couple pens in the multi-hundred watt range. Some thick solder wick, and there they were. =] Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of de W5DK Sent: Monday, June 29, 2009 2:11 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure Yes, be careful not to strip any screws when you try to get the back/bottom open. He was saying it takes allot of heat to get the helical coil unsoldered from the side of the casting (once you have it open you will see). I have used a propane torch setting stationary on a bench while holding the casting in one hand and a pair of needle nose in the other, I hold that joint in the heat till it flows or till I had to put on a glove or drop the casting hihi. Don Kirchner W5DK -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Monday, June 29, 2009 1:42 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure On my exec II receiver, the casting is just screwed together. Correct? Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Friday, June 26, 2009 9:00 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure Chuck's got you going down the right path. At 51 MHz, you probably only have to take one turn off of each of the first two coils. At 52 MHz or higher, you might have to take off two. You need a lot of heat to get the casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut it). Removing the coils/caps once you have the casting apart is pretty straightfoward, as is removing one turn from each. It's not that bad of a job once you've done one or two, but the first one may cause you some grief. You should find that after the mods the receiver is plenty hot and should easily beat spec by a few dB. The LO/multiplier stages don't require any mods. If you want to cut corners, you might first see what your effective sensitivity is at your repeater site on 6m. You may find that the noise floor is elevated substantially, and that getting the bench sensitivity down from 1 uV to 0.3 uV isn't going to make a damned bit of difference in the real world. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Friday, June 26, 2009 4:16 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure You are correct sir, no mesh. Isn't that that pits. So I take it I'll be removing some windings from the underside of said trimmer caps? Or is there an easier route to sensitivity? =] Chris, Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Friday, June 26, 2009 12:09 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MastrII Receiver Failure Do the two front end trimmer caps still have some mesh left, or are they at minimum capacitance? That may be your problem. Chuck WB2EDV - Original Message - From: Chris Curtis demo...@rollanet.org mailto:demoman%40rollanet.org To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, June 26, 2009 10:45 AM Subject: RE: [Repeater-Builder] MastrII Receiver Failure I have a mastr EXEC II receiver (33 split) that I can't get sensitivity to increase. I replaced the fet as outlined below on the mastr II query. No joy though. I'm using an am/fm-1200s to tune the receiver. .5~1uv is where the receiver is coming to life. I have a couple vhf and uhf exec II receivers that tuned up nicely in the .19~.2uv range so I think I'm doing/reading it correctly. Original freq was in the 46~49mHz range. Current crystal (icom sent to and received from Bomar) on 51.75mHz. Any tips/hints/tricks to get a little more sensitivity? Thanks for the bandwidth! Chris Kb0wlf No virus found in this incoming message. Checked by AVG - www.avg.com Version:
RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure
Sounds like you have the hard part already licked! Let us know what the sensitivity is after the mods. --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis Sent: Monday, June 29, 2009 3:27 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure Yes, I have the coils out already. Was just touching base about the entire casting. I have a couple pens in the multi-hundred watt range. Some thick solder wick, and there they were. =] Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of de W5DK Sent: Monday, June 29, 2009 2:11 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure Yes, be careful not to strip any screws when you try to get the back/bottom open. He was saying it takes allot of heat to get the helical coil unsoldered from the side of the casting (once you have it open you will see). I have used a propane torch setting stationary on a bench while holding the casting in one hand and a pair of needle nose in the other, I hold that joint in the heat till it flows or till I had to put on a glove or drop the casting hihi. Don Kirchner W5DK -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chris Curtis Sent: Monday, June 29, 2009 1:42 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure On my exec II receiver, the casting is just screwed together. Correct? Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Friday, June 26, 2009 9:00 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure Chuck's got you going down the right path. At 51 MHz, you probably only have to take one turn off of each of the first two coils. At 52 MHz or higher, you might have to take off two. You need a lot of heat to get the casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut it). Removing the coils/caps once you have the casting apart is pretty straightfoward, as is removing one turn from each. It's not that bad of a job once you've done one or two, but the first one may cause you some grief. You should find that after the mods the receiver is plenty hot and should easily beat spec by a few dB. The LO/multiplier stages don't require any mods. If you want to cut corners, you might first see what your effective sensitivity is at your repeater site on 6m. You may find that the noise floor is elevated substantially, and that getting the bench sensitivity down from 1 uV to 0.3 uV isn't going to make a damned bit of difference in the real world. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chris Curtis Sent: Friday, June 26, 2009 4:16 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] MastrII Receiver Failure You are correct sir, no mesh. Isn't that that pits. So I take it I'll be removing some windings from the underside of said trimmer caps? Or is there an easier route to sensitivity? =] Chris, Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com mailto:Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Friday, June 26, 2009 12:09 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MastrII Receiver Failure Do the two front end trimmer caps still have some mesh left, or are they at
[Repeater-Builder] Re: Echoing
It sounds like it is repeating the same thing twice like a echo.Sometimes it starts to echo then it turns to noise till the user unkeys.I have not heard it in a week and sometimes it happens for hours.When this echoing is happening and the Repeater ids or says one of the messages stored in the controller it goes away.To me I think it does not happen because the receiver is not being used when the messages or id is happening as everyone waits till it is done.Thanks Mike KC8FWD --- In Repeater-Builder@yahoogroups.com, Eric Lowell elowell9...@... wrote: Can you define and describe what you mean by echoing? I've not heard that term used with regard to a repeater. Might be a regional usage? Thanks, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@... www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@... wrote: From: Michael J.Talkington kc8...@... Subject: [Repeater-Builder] Echoing To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 9:27 AM Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
[Repeater-Builder] Re: Echoing
Could you explain your situation please. Thanks Mike KC8FWD --- In Repeater-Builder@yahoogroups.com, Michael Ryan mryan...@... wrote: Unless he is talking about some mixing of some sore due to a spur..I had such a problem this past spring. Did not know how to describe it but echoing sort of covers it. We retuned the transmitter and all seems fine now. .just in case he has the same thing going on. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Monday, June 29, 2009 12:26 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Echoing I suspect the controller has an audio delay board and a user had another radio listening to the repeater in the background - that causes an echo. Chuck WB2EDV - Original Message - From: Michael J.Talkington kc8...@... mailto:kc8fwd%40hotmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, June 29, 2009 9:27 AM Subject: [Repeater-Builder] Echoing Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD Yahoo! Groups Links __ NOD32 4196 (20090629) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
[Repeater-Builder] Re: Pass-Notch Duplexer Woes
Hi Jeff, Looks like success! Did a ratio type calculation then started with the wire cutters trimmed a little at a time looking at the high side loss. Got it down to 0.6dB per can - with all of them connected, it's 3 dB. They do have the rotatable links in the cans. From what I read, it affects the loss and the notch depth. Checked the return on the TX, had no reflected power. Gonna take it to the temporary site run a while. Thanks again for the help - if you get to Utopia, give me a buzz - I owe you a meal!! Tim W5FN --- In Repeater-Builder@yahoogroups.com, Jeff DePolo j...@... wrote: Looks like there is 2 dB loss at a 600 khz + spacing (which is where the problems were). (all 4 cans = 2dB) 2 dB is fine for 4 cavities per side. If you are able to get under 2.5 dB for those 4 cavities when retuned on 2m, I'd say you're doing pretty well. What about the links inside the cans? I have a set of drawings for a lower freq range, but wasn't sure what that would buy for me. Can I just disconnect the link from the SO-239 center conductor add some copper stock to make it longer (making sure the flat area gets longer)? The loops shouldn't require modification. Are the loops rotatable on this unit? Also, will the can's interconnect cables be an issue? They are about 9-10 currently. Yes, they will likely need to be scaled, but before you go through all of that work, try it without redoing the harness and see what you get. You can also add elbow adapters or connector savers at strategic locations to lengthen the cables slightly, at least for testing, to see if it makes an improvement. --- Jeff WN3A
RE: [Repeater-Builder] Re: Echoing
Mike, It was suggested by Skip or one of the other regulars on this group that a misaligned or out of tune transmitter may produce a spur. That spur may mix or otherwise cause issues in the transmitter that can make some 'mysterious' ( for the lack of a more scientific term) sounds on your repeater. Just a thought like I said. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael J.Talkington Sent: Monday, June 29, 2009 3:49 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Echoing Could you explain your situation please. Thanks Mike KC8FWD --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Michael Ryan mryan...@... wrote: Unless he is talking about some mixing of some sore due to a spur..I had such a problem this past spring. Did not know how to describe it but echoing sort of covers it. We retuned the transmitter and all seems fine now. .just in case he has the same thing going on. - Mike From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Monday, June 29, 2009 12:26 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Echoing I suspect the controller has an audio delay board and a user had another radio listening to the repeater in the background - that causes an echo. Chuck WB2EDV - Original Message - From: Michael J.Talkington kc8...@... mailto:kc8fwd%40hotmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, June 29, 2009 9:27 AM Subject: [Repeater-Builder] Echoing Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD Yahoo! Groups Links __ NOD32 4196 (20090629) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com __ NOD32 4197 (20090629) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
Re: [Repeater-Builder] Re: Echoing
Thanks for the clarification. I'd like to assume that your duplexer and cabling have been tuned up with a spectrum analyser/tracking generator and look good on the scope. I have seen cavities get noisy where finger stock rides on tuning rods, but this issue doesnt sound like that. It has been postulated that you might have a TX spur that comes up and causes the problem. I tend to lean in that direction. Since the problem is intermittent, you are going to have to go over everything until the problem goes away. If your radio is at a commercial site, you may find another transmitter involved. In any case, it won't hurt to look at the duplexer, but I wouldn't think that was the issue, unless it has given problems before. Good Luck with it! Keep us posted. Regards de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@hotmail.com wrote: From: Michael J.Talkington kc8...@hotmail.com Subject: [Repeater-Builder] Re: Echoing To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 3:45 PM It sounds like it is repeating the same thing twice like a echo.Sometimes it starts to echo then it turns to noise till the user unkeys.I have not heard it in a week and sometimes it happens for hours.When this echoing is happening and the Repeater ids or says one of the messages stored in the controller it goes away.To me I think it does not happen because the receiver is not being used when the messages or id is happening as everyone waits till it is done.Thanks Mike KC8FWD --- In Repeater-Builder@ yahoogroups. com, Eric Lowell elowell9756@ ... wrote: Can you define and describe what you mean by echoing? I've not heard that term used with regard to a repeater. Might be a regional usage? Thanks, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@... www.satnetmaine. com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@... wrote: From: Michael J.Talkington kc8...@... Subject: [Repeater-Builder] Echoing To: Repeater-Builder@ yahoogroups. com Date: Monday, June 29, 2009, 9:27 AM Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
[Repeater-Builder] Sinclair Q202GC Duplexer Help
Eric, Thanks for your help and the otheer response that we have had with this problem. I have sent you a couple emails containing pictures of the duplexer as you requested and can send anyone else interested the same. We are trying really hard to complete this project as hurricane season is now upon us and this repeater will also tie into The intertie to include Skywarn in Peachtree city, GA. Please keep the response coming as all info is greatly appreciated. Worst case I guess is we send these back to Sinclair to re-tune or simply replace with another set. Either is an option but neither would be better. We would love to have these re-tuned locally just to save on costs as with most in today's economy funds are running low. 73's N4SFU/Ron
RE: [Repeater-Builder] Re: Echoing
Sounds like your transmitter has spurs and it is drifting getting into the receiver. I had this happen to a GE MASTR II repeater that one of the HAMS put a filter cavity on the transmitter to fix a desense problem. When the repeater was first keyed after being idle for a while it had spurs like crazy and not only caused interference to their repeater but others as it climbed up the band. Get a good spectrum analyzer and look at the spectrum that the transmitter is transmitting on. David -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael J.Talkington Sent: Monday, June 29, 2009 2:46 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Echoing It sounds like it is repeating the same thing twice like a echo.Sometimes it starts to echo then it turns to noise till the user unkeys.I have not heard it in a week and sometimes it happens for hours.When this echoing is happening and the Repeater ids or says one of the messages stored in the controller it goes away.To me I think it does not happen because the receiver is not being used when the messages or id is happening as everyone waits till it is done.Thanks Mike KC8FWD --- In Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com, Eric Lowell elowell9...@... wrote: Can you define and describe what you mean by echoing? I've not heard that term used with regard to a repeater. Might be a regional usage? Thanks, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@... www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@... wrote: From: Michael J.Talkington kc8...@... Subject: [Repeater-Builder] Echoing To: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com Date: Monday, June 29, 2009, 9:27 AM Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
Re: [Repeater-Builder] Re: Echoing
- Original Message - From: David Murman To: Repeater-Builder@yahoogroups.com Sent: Monday, June 29, 2009 6:28 PM Subject: RE: [Repeater-Builder] Re: Echoing It sounds like it is repeating the same thing twice like a echo.Sometimes it starts to echo then it turns to noise till the user unkeys.I have not heard it in a week and sometimes it happens for hours.When this echoing is happening and the Repeater ids or says one of the messages stored in the controller it goes away.To me I think it does not happen because the receiver is not being used when the messages or id is happening as everyone waits till it is done.Thanks Mike KC8FWD --- In Repeater-Builder@yahoogroups.com, Eric Lowell elowell9...@... wrote: Can you define and describe what you mean by echoing? I've not heard that term used with regard to a repeater. Might be a regional usage? Thanks, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@... www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@... wrote: From: Michael J.Talkington kc8...@... Subject: [Repeater-Builder] Echoing To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 9:27 AM Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
Re: [Repeater-Builder] Sinclair Q202GC Duplexer Help
Hi Ron, I would like to see pic of those sinclairs. E-mail them to me at n5...@hotmail.com if you don't mind. 73 de N5NPO Norm - Original Message - From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Mon Jun 29 17:40:42 2009 Subject: [Repeater-Builder] Sinclair Q202GC Duplexer Help Eric, Thanks for your help and the otheer response that we have had with this problem. I have sent you a couple emails containing pictures of the duplexer as you requested and can send anyone else interested the same. We are trying really hard to complete this project as hurricane season is now upon us and this repeater will also tie into The intertie to include Skywarn in Peachtree city, GA. Please keep the response coming as all info is greatly appreciated. Worst case I guess is we send these back to Sinclair to re-tune or simply replace with another set. Either is an option but neither would be better. We would love to have these re-tuned locally just to save on costs as with most in today's economy funds are running low. 73's N4SFU/Ron
Re: [Repeater-Builder] Re: Echoing
Hello, Sorry to jump in without having followed all of the discussion, but has anyone suggested looking for a dual audio path in the repeater? Depending upon the equipment used, for example a commercial repeater adapted for amateur use with a controller added, may have the original audio path in tact as well as a second path via the controller. Normally, this condition would have a phase delayed distortion effect but if the controller has a delay option then echo is very possible. However, I don't think the condition would come and go unless there was an intermittent condition causing the secondary or unwanted path to come and go. Is there any receiver voting in use on this system? Bill, WA8WG - Original Message - From: David Murman To: Repeater-Builder@yahoogroups.com Sent: Monday, June 29, 2009 6:28 PM Subject: RE: [Repeater-Builder] Re: Echoing It sounds like it is repeating the same thing twice like a echo.Sometimes it starts to echo then it turns to noise till the user unkeys.I have not heard it in a week and sometimes it happens for hours.When this echoing is happening and the Repeater ids or says one of the messages stored in the controller it goes away.To me I think it does not happen because the receiver is not being used when the messages or id is happening as everyone waits till it is done.Thanks Mike KC8FWD --- In Repeater-Builder@yahoogroups.com, Eric Lowell elowell9...@... wrote: Can you define and describe what you mean by echoing? I've not heard that term used with regard to a repeater. Might be a regional usage? Thanks, de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@... www.satnetmaine.com 207-210-7469 --- On Mon, 6/29/09, Michael J.Talkington kc8...@... wrote: From: Michael J.Talkington kc8...@... Subject: [Repeater-Builder] Echoing To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 9:27 AM Hello, The other day I overheard a few people talking about the local repeater echoing once in a while. I have heard it also and it is just random. now one of them said that the duplexers probably need retuned as the depth of the notch is not enough.Has any one ever experienced this before? thanks Mike KC8FWD
RE: [Repeater-Builder] DC Ground Lightning Protection on antenna????
If the tower is bolted to galvanized pipe that is embedded in concrete of which a significant amount is in contact with soil, you have a concrete-encased grounding electrode which is hard to improve upon. It is not likely that a ground rod would be worthwhile, since damp concrete (concrete in intimate contact with soil at grade level) is a fairly good conductor, and such a footing or foundation has hundreds of times the surface area of a ground rod. Just be certain that your station equipment is solidly bonded to the tower and to the electrical service neutral with a #6 AWG or larger copper conductor. Specific guidance for the grounding and bonding of radio and television antennas, including Amateur Radio systems, is found in Article 810 of NFPA 70, the National Electrical Code. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of agrimm0034 Sent: Sunday, June 28, 2009 9:34 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] DC Ground Lightning Protection on antenna I bought a nice looking RFS Celwave antenna to use on 462.600 Specs are DC ground for lightning protection but is there something I need to do to make sure it is protected? It sits on 3 legged tower 40 ft up and the tower is mounted on the side of a structure. It sets on 3 pieces of galvanized pipe that are set in concrete. Overall the tower is grounded just not as good as what I could make it be. If I ran a grounding rod into the ground and ran #8 or heavier wire to the tower would I just be wasting my time to protect the antenna or what should I do to make sure everything is protected ok. Thanks
Re: [Repeater-Builder] DC Ground Lightning Protection on antenna????
Here's a little more info regarding lightning protection. http://www.polyphaser.com/cms_spol_app/techdocs/Coax%20Cable%20Entry.pdf Chuck WB2EDV - Original Message - From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Monday, June 29, 2009 8:41 PM Subject: RE: [Repeater-Builder] DC Ground Lightning Protection on antenna If the tower is bolted to galvanized pipe that is embedded in concrete of which a significant amount is in contact with soil, you have a concrete-encased grounding electrode which is hard to improve upon. It is not likely that a ground rod would be worthwhile, since damp concrete (concrete in intimate contact with soil at grade level) is a fairly good conductor, and such a footing or foundation has hundreds of times the surface area of a ground rod. Just be certain that your station equipment is solidly bonded to the tower and to the electrical service neutral with a #6 AWG or larger copper conductor. Specific guidance for the grounding and bonding of radio and television antennas, including Amateur Radio systems, is found in Article 810 of NFPA 70, the National Electrical Code. 73, Eric Lemmon WB6FLY
Re: [Repeater-Builder] Sinclair Q202GC Duplexer Help
Ron I too would like to see the pictures, Would you send them to me also at wa9...@arrl.net. Thanks Allan Crites WA9ZZU --- On Mon, 6/29/09, NORM KNAPP nkn...@twowayradio.net wrote: From: NORM KNAPP nkn...@twowayradio.net Subject: Re: [Repeater-Builder] Sinclair Q202GC Duplexer Help To: Repeater-Builder@yahoogroups.com Date: Monday, June 29, 2009, 7:07 PM Hi Ron, I would like to see pic of those sinclairs. E-mail them to me at n5...@hotmail. com if you don't mind. 73 de N5NPO Norm - Original Message - From: Repeater-Builder@ yahoogroups. com Repeater-Builder@ yahoogroups. com To: Repeater-Builder@ yahoogroups. com Repeater-Builder@ yahoogroups. com Sent: Mon Jun 29 17:40:42 2009 Subject: [Repeater-Builder] Sinclair Q202GC Duplexer Help Eric, Thanks for your help and the otheer response that we have had with this problem. I have sent you a couple emails containing pictures of the duplexer as you requested and can send anyone else interested the same. We are trying really hard to complete this project as hurricane season is now upon us and this repeater will also tie into The intertie to include Skywarn in Peachtree city, GA. Please keep the response coming as all info is greatly appreciated. Worst case I guess is we send these back to Sinclair to re-tune or simply replace with another set. Either is an option but neither would be better. We would love to have these re-tuned locally just to save on costs as with most in today's economy funds are running low. 73's N4SFU/Ron
RE: [Repeater-Builder] DC Ground Lightning Protection on antenna????
Some lightning facts: There is no amount of grounding that will help protect an antenna from lightning damage. Grounding will not help an antenna or tower from being struck by lightning. However if a lightning rod is placed above the antenna or a wire sloping down from above and around the antenna it will intercept a lightning strike and prevent the antenna from being hit. It would be important to have the lightning rod/wire well bonded to the tower and the tower well grounded. A well grounded tower and antenna bonded well to the tower will help prevent damage to other equipment tied to the antenna. Also feedlines should be well bonded to the tower at top and bottom. Ground rod surface area is much less important than length. Extra surface area contributes little to rod effectiveness. Too long of a ground rod and the extra length becomes ineffective due to the high inductance of the long length. Several ground rods spaced approximately the sum of the length of two adjacent rods is most effective. A good lightning ground consist of a low impedance, low resistance and high capacitance coupling to earth. Lightning is composed of very low (DC) and high frequencies (peak at around 1 MHz). If many ground rods are used in a star configuration, it is not necessary to use large wire connecting all the rods as the lightning energy will be divided between all paths so less current flows on any individual wire. If ground rods are placed in a star configuration it does no good to add rings of wire connecting the rods together. The lightning energy travels in a straight line out away from the tower on each radial and each radial carries equal current. So there is no difference of potential between rods or radials. Copper strap for ground connections will reduce the inductance thus lowering the impedance of the path. A separate heavy copper wire or strap running down a tower tied to the antenna to ground is a waste of copper. The tower itself is a much lower inductance path than what a separate ground wire provides. 73 Gary K4FMX -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Monday, June 29, 2009 7:42 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] DC Ground Lightning Protection on antenna If the tower is bolted to galvanized pipe that is embedded in concrete of which a significant amount is in contact with soil, you have a concrete-encased grounding electrode which is hard to improve upon. It is not likely that a ground rod would be worthwhile, since damp concrete (concrete in intimate contact with soil at grade level) is a fairly good conductor, and such a footing or foundation has hundreds of times the surface area of a ground rod. Just be certain that your station equipment is solidly bonded to the tower and to the electrical service neutral with a #6 AWG or larger copper conductor. Specific guidance for the grounding and bonding of radio and television antennas, including Amateur Radio systems, is found in Article 810 of NFPA 70, the National Electrical Code. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of agrimm0034 Sent: Sunday, June 28, 2009 9:34 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] DC Ground Lightning Protection on antenna I bought a nice looking RFS Celwave antenna to use on 462.600 Specs are DC ground for lightning protection but is there something I need to do to make sure it is protected? It sits on 3 legged tower 40 ft up and the tower is mounted on the side of a structure. It sets on 3 pieces of galvanized pipe that are set in concrete. Overall the tower is grounded just not as good as what I could make it be. If I ran a grounding rod into the ground and ran #8 or heavier wire to the tower would I just be wasting my time to protect the antenna or what should I do to make sure everything is protected ok. Thanks Yahoo! Groups Links
RE: [Repeater-Builder] Sinclair Q202GC Duplexer Help
I looked at Ron's photos, and have confirmed that his Q202-G duplexer is, in fact, the later model with integral notch tuning capacitors. Converting that duplexer for operation at 2m may require nothing more than replacement of the RG-213/U harness with RG-400/U or RG-214/U cable, being careful to have 14 inches between tee centers. I have tuned three such duplexers after modification, and their performance is very good. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of n4sfu Sent: Monday, June 29, 2009 3:41 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Sinclair Q202GC Duplexer Help Eric, Thanks for your help and the otheer response that we have had with this problem. I have sent you a couple emails containing pictures of the duplexer as you requested and can send anyone else interested the same. We are trying really hard to complete this project as hurricane season is now upon us and this repeater will also tie into The intertie to include Skywarn in Peachtree city, GA. Please keep the response coming as all info is greatly appreciated. Worst case I guess is we send these back to Sinclair to re-tune or simply replace with another set. Either is an option but neither would be better. We would love to have these re-tuned locally just to save on costs as with most in today's economy funds are running low. 73's N4SFU/Ron
[Repeater-Builder] Phelps Dodge 522-509 Duplexers
Does anyone know the specs for these cans? BTW, I have the tuning instructions for them if anyone wants a copy. 73, Joe,. K1ike
RE: [Repeater-Builder] Sinclair - big price jump?
Anyone else hear if this is true? -M From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ken Arck Sent: Tuesday, June 02, 2009 12:26 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Sinclair - big price jump? Just a note.. Last I heard, Comprod stuff is actually Cushcraft stuff Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em! . http://geo.yahoo.com/serv?s=97359714/grpId=104168/grpspId=1705063108/msgId= 91828/stime=1243960041/nc1=1/nc2=2/nc3=3 __ NOD32 4123 (20090602) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
