RE: [Repeater-Builder] Master II station 66 split conversion to 56 split
Well, that's good news. Maybe that's why I could find no references to the replacement procedure. I suppose that NHRC is being cautious in case mileage varies. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jim Brown Sent: Sunday, March 22, 2009 6:04 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Master II station 66 split conversion to 56 split I have retuned 10+ GE Mastr II exciters - base/moble and have never had to change a component. Put the ICOM in for the new frequency and tune per the manual. I use a Bird milliWatt meter that has a 250 mW full scale and an internal 50 Ohm load to finish the tuning, after going through the test points with a Simpson 260. Peaking the previous stage and dipping for the input to the next stage as per the tuning instructions will give you a working exciter as long as there is no component issue in the exciter. 73 - Jim W5ZIT --- On Sun, 3/22/09, Morris Dillingham mdi...@nnwifi.com wrote: From: Morris Dillingham mdi...@nnwifi.com Subject: [Repeater-Builder] Master II station 66 split conversion to 56 split To: Repeater-Builder@yahoogroups.com Date: Sunday, March 22, 2009, 2:20 PM Now that you have helped me close out the old Spectrum issues, can anyone point me to the list of caps and their new values to convert the exciter board of a Master II station? On the NHRC site I see mention of the need to change out a dozen or so caps but no other references. 73 de Morris KI4IUA
RE: [Repeater-Builder] Master II station 66 split conversion to 56 split
Since we are retuning to 147.330 transmit and 147.930 receive, we are at the end of the band that should help. Thanks to all for the reassurance. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of n...@no6b.com Sent: Sunday, March 22, 2009 6:36 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Master II station 66 split conversion to 56 split At 3/22/2009 15:03, you wrote: I have retuned 10+ GE Mastr II exciters - base/moble and have never had to change a component. Put the ICOM in for the new frequency and tune per the manual. Same experience here, except that if you want to put one on the 144.390 APRS frequency you may find that some exciters don't quite make it down that far. Bob NO6B Yahoo! Groups Links
RE: [Repeater-Builder] SCR-200(A)
Perhaps the last update on the SCT1000/SCR200 rebuild: We took the duplexer that we had been using for testing back to the guy who tuned it. It turns out that it was tuned for another repeater frequency so we were ok with the setup of the repeater itself. Thanks to Larry and Joe specifically and to the list in general for all your good assistance and appropriate questions. The repeater should soon be back on task. 73 de Morris KI4IUA -Original Message- From: Morris Dillingham [mailto:mdi...@nnwifi.com] Sent: Tuesday, March 17, 2009 6:54 PM To: 'k1ike_m...@snet.net' Cc: 'Repeater-Builder@yahoogroups.com' Subject: RE: [Repeater-Builder] SCR-200(A) Continuing saga of the SCR-1000 which received signals that keyed COR but with no received audio: We tested again today with the transmitter inhibited but using the duplexer. Receiver performed fine up to 5 or more miles away. Apparently the duplexer is questionably aligned and is causing desense. We go on Saturday to the original tuner who is expressing doubts about how he originally tuned the duplexer. He has spectrum analyzer and other equipment which will allow checking for spurs, etc. so it's not all that bad that this happened, especially since I learned so much about the importance of separation of signals. 73 de Morris KI4IUA -Original Message- From: Morris Dillingham [mailto:mdi...@nnwifi.com] Sent: Friday, March 13, 2009 10:34 PM To: 'k1ike_m...@snet.net' Cc: 'Repeater-Builder@yahoogroups.com' Subject: RE: [Repeater-Builder] SCR-200(A) Joe, the duplexer had been tuned by someone else. It did appear to work ok in another lashup with other equipment. I haven't been back to the test site to try it without the transmitter but it could have been desense as the COR worked. I'll have to get my cohort to try it as he is close to the equipment in fact it's at his QTH. You may have guessed by now that I'm new to this facet of radio. I'm beginning to realize how important this desense topic is. Thanks for the great question you pose. We plan another test tomorrow with the transmitter off. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Joe Sent: Friday, March 13, 2009 9:39 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] SCR-200(A) Hello Morris, I'm glad to heard the that you got the receiver working! Just one question, was the test duplexer tuned to the proper frequencies? Was it desense or just loss of sensitivity when using the duplexer? In other words, were you able to hear distant signals with the transmitter turned off? 73, Joe, K1ike Morris Dillingham wrote: Well, guys, I promised to follow up with the results of my attempt to repair the old Spectrum 1000 with the later model receiver. Thanks to Larry and Joe, I have determined that my receiver is not an SCR200A but probably a later model of the SCR-200. I obtained at least three versions of the schematic from this series receiver thanks to these two gentlemen. Of utmost importance was finding out the transistor part number since my schematic was the wrong version. I was able to replace the front RF amp and get the receiver working again. Before doing that, however, I noted the inadequate wiring, IMHO, in the power supply. The SCR-1000 upgraded PS has plenty of safety factor designed in as far as series pass transistors, etc. but the size of the wires was amazingly small. I completely rewired the high current circuits to match the rest of the design. I am wondering if during the period of this antique repeater there was a shortage of copper and the price was high. After rewiring, the power output of the transmitter was noticeably increased to about 78 watts while it's specified as a 70 watt PA. I took the repeater to a staging area where we had another duplexer to test it on the air. (The actual installation is in the county jail in a jail cell) Distant signals would develop a COR but there was no audio when using the duplexer. When the antenna is directly attached to the receiver with the transmitter on dummy load, it works fine. At this point we were too tired to go further so will get back on it again soon. I suppose the front end may need touching up with that duplexer which has been checked out on another setup. Thanks again to Joe, Larry and the list for their excellent help. 73 de Morris KI4IUA Yahoo! Groups Links Yahoo! Groups Links
[Repeater-Builder] Master II station 66 split conversion to 56 split
Now that you have helped me close out the old Spectrum issues, can anyone point me to the list of caps and their new values to convert the exciter board of a Master II station? On the NHRC site I see mention of the need to change out a dozen or so caps but no other references. 73 de Morris KI4IUA attachment: winmail.dat
RE: [Repeater-Builder] SCR-200(A)
Continuing saga of the SCR-1000 which received signals that keyed COR but with no received audio: We tested again today with the transmitter inhibited but using the duplexer. Receiver performed fine up to 5 or more miles away. Apparently the duplexer is questionably aligned and is causing desense. We go on Saturday to the original tuner who is expressing doubts about how he originally tuned the duplexer. He has spectrum analyzer and other equipment which will allow checking for spurs, etc. so it's not all that bad that this happened, especially since I learned so much about the importance of separation of signals. 73 de Morris KI4IUA -Original Message- From: Morris Dillingham [mailto:mdi...@nnwifi.com] Sent: Friday, March 13, 2009 10:34 PM To: 'k1ike_m...@snet.net' Cc: 'Repeater-Builder@yahoogroups.com' Subject: RE: [Repeater-Builder] SCR-200(A) Joe, the duplexer had been tuned by someone else. It did appear to work ok in another lashup with other equipment. I haven't been back to the test site to try it without the transmitter but it could have been desense as the COR worked. I'll have to get my cohort to try it as he is close to the equipment in fact it's at his QTH. You may have guessed by now that I'm new to this facet of radio. I'm beginning to realize how important this desense topic is. Thanks for the great question you pose. We plan another test tomorrow with the transmitter off. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Joe Sent: Friday, March 13, 2009 9:39 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] SCR-200(A) Hello Morris, I'm glad to heard the that you got the receiver working! Just one question, was the test duplexer tuned to the proper frequencies? Was it desense or just loss of sensitivity when using the duplexer? In other words, were you able to hear distant signals with the transmitter turned off? 73, Joe, K1ike Morris Dillingham wrote: Well, guys, I promised to follow up with the results of my attempt to repair the old Spectrum 1000 with the later model receiver. Thanks to Larry and Joe, I have determined that my receiver is not an SCR200A but probably a later model of the SCR-200. I obtained at least three versions of the schematic from this series receiver thanks to these two gentlemen. Of utmost importance was finding out the transistor part number since my schematic was the wrong version. I was able to replace the front RF amp and get the receiver working again. Before doing that, however, I noted the inadequate wiring, IMHO, in the power supply. The SCR-1000 upgraded PS has plenty of safety factor designed in as far as series pass transistors, etc. but the size of the wires was amazingly small. I completely rewired the high current circuits to match the rest of the design. I am wondering if during the period of this antique repeater there was a shortage of copper and the price was high. After rewiring, the power output of the transmitter was noticeably increased to about 78 watts while it's specified as a 70 watt PA. I took the repeater to a staging area where we had another duplexer to test it on the air. (The actual installation is in the county jail in a jail cell) Distant signals would develop a COR but there was no audio when using the duplexer. When the antenna is directly attached to the receiver with the transmitter on dummy load, it works fine. At this point we were too tired to go further so will get back on it again soon. I suppose the front end may need touching up with that duplexer which has been checked out on another setup. Thanks again to Joe, Larry and the list for their excellent help. 73 de Morris KI4IUA Yahoo! Groups Links Yahoo! Groups Links
RE: [Repeater-Builder] SCR-200(A)
Hi Eric, I very much appreciate any insight on this subject. I have obtained far more useful information than I could imagine before seeking help here. The friend who did the tuning did so several years ago right before moving his QTH and donating the duplexer to our club. He can't remember for sure if he tuned it for us or for another friend who expressed interest in it so it appears it may have been simply confusion on his part as to who was getting the duplexer and he may have tuned it for the wrong recipient. I guess we can sort it all out on Saturday. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Tuesday, March 17, 2009 8:16 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] SCR-200(A) Morris, This is a very interesting thread, and it prompts me to make a general comment about duplexer tuning. Please do not take any of the following to be a criticism of your friend's knowledge, equipment, or procedures. Whenever the subject of duplexer tuning comes up, there are always responses from folks who use one or two handheld radios as signal sources and detectors, and they claim that they have had repeated success with such basic methods. Then, we frequently hear from folks who claim that one must have a spectrum analyzer equipped with a tracking generator in order to perform a proper duplexer alignment. The folks in the second category usually claim to have vast experience in this area. Finally, we occasionally hear from a few folks who airily claim that only a network analyzer can perform a proper duplexer tuning, although a spectrum analyzer with a return-loss bridge may suffice. Sometimes these posters have an elitist attitude, and that can offend the lesser folk who don't have such equipment. The fact is that any method that works, is okay! The difference between the methods often is a fraction of a dB. But, sometimes, that fraction of a dB is important- Public Safety is one example. It does little good to use a GPS-disciplined network analyzer to fine-tune a duplexer to within a gnat's eyelash, if the repeater owner simply plugs a crystal from Billy Bob's Discount Crystal Emporium into an existing channel element, and then wonders why his repeater doesn't seem to be on frequency. Those of you who have tuned a BpBr duplexer using only a spectrum analyzer or an RF millivoltmeter know that the bandpass display is very broad. Although you may be able to tweak the notch exactly, the peak of the bandpass response is difficult to tune. Ah, but look at what you see when return loss instead of transmission is viewed! You can nail that bandpass peak with extreme accuracy, and that is important for maximizing sensitivity and minimizing desense from other emitters. I guess the bottom line is that sometimes, an interference problem can be solved by tightening tolerances and fine-tuning each component. Make certain your own house is in order before blaming others. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Morris Dillingham Sent: Tuesday, March 17, 2009 3:54 PM To: k1ike_m...@snet.net Cc: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] SCR-200(A) Continuing saga of the SCR-1000 which received signals that keyed COR but with no received audio: We tested again today with the transmitter inhibited but using the duplexer. Receiver performed fine up to 5 or more miles away. Apparently the duplexer is questionably aligned and is causing desense. We go on Saturday to the original tuner who is expressing doubts about how he originally tuned the duplexer. He has spectrum analyzer and other equipment which will allow checking for spurs, etc. so it's not all that bad that this happened, especially since I learned so much about the importance of separation of signals. 73 de Morris KI4IUA -Original Message- From: Morris Dillingham [mailto:mdi...@nnwifi.com mailto:mdilli%40nnwifi.com ] Sent: Friday, March 13, 2009 10:34 PM To: 'k1ike_m...@snet.net mailto:%27k1ike_mail%40snet.net ' Cc: 'Repeater-Builder@yahoogroups.com mailto:%27Repeater-Builder%40yahoogroups.com ' Subject: RE: [Repeater-Builder] SCR-200(A) Joe, the duplexer had been tuned by someone else. It did appear to work ok in another lashup with other equipment. I haven't been back to the test site to try it without the transmitter but it could have been desense as the COR worked. I'll have to get my cohort to try it as he is close to the equipment in fact it's at his QTH. You may have guessed by now that I'm new to this facet of radio. I'm beginning to realize how important this desense topic is. Thanks for the great question you pose. We plan another test
[Repeater-Builder] SCR-200(A)
Well, guys, I promised to follow up with the results of my attempt to repair the old Spectrum 1000 with the later model receiver. Thanks to Larry and Joe, I have determined that my receiver is not an SCR200A but probably a later model of the SCR-200. I obtained at least three versions of the schematic from this series receiver thanks to these two gentlemen. Of utmost importance was finding out the transistor part number since my schematic was the wrong version. I was able to replace the front RF amp and get the receiver working again. Before doing that, however, I noted the inadequate wiring, IMHO, in the power supply. The SCR-1000 upgraded PS has plenty of safety factor designed in as far as series pass transistors, etc. but the size of the wires was amazingly small. I completely rewired the high current circuits to match the rest of the design. I am wondering if during the period of this antique repeater there was a shortage of copper and the price was high. After rewiring, the power output of the transmitter was noticeably increased to about 78 watts while it's specified as a 70 watt PA. I took the repeater to a staging area where we had another duplexer to test it on the air. (The actual installation is in the county jail in a jail cell) Distant signals would develop a COR but there was no audio when using the duplexer. When the antenna is directly attached to the receiver with the transmitter on dummy load, it works fine. At this point we were too tired to go further so will get back on it again soon. I suppose the front end may need touching up with that duplexer which has been checked out on another setup. Thanks again to Joe, Larry and the list for their excellent help. 73 de Morris KI4IUA attachment: winmail.dat
RE: [Repeater-Builder] SCR-200(A)
Thanks, Don, for the story about your SCR-200A. Sounds like the PS wiring was a common issue at the time. The local club was able to get space on the county sheriff's tower. The repeater went into a jail cell which appears to be the solitary confinement one. It sits on the steel bunk along with an FBI repeater. We have a weekly Jailhouse Net or will have again when operational. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Don Kupferschmidt Sent: Friday, March 13, 2009 8:57 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] SCR-200(A) Morris, I'm not even to ask why the actual installation is in the county jail in a jail cell. I'll bet that's an actual story onto its self. I had an SCR2000A when I started in the ham repeater hobby, but soon realized that it was quite inferior. When I had it, I also re-wired the power supply, as you have, and the machine just sat there and ran. No issues. As far as the receiver goes, well, it's a stretch. It's not mother MOTO or GE, but it gets the job done. I finally got rid of it and acquired a MICOR with a unified chassis. Best money I've ever spent. Worth every dollar. Good luck on getting the system up and running. 73, Don, KD9PT - Original Message - From: Morris Dillingham mdi...@nnwifi.com To: k1ike_m...@snet.net; la...@n7fm.com Cc: Repeater-Builder@yahoogroups.com Sent: Friday, March 13, 2009 6:55 PM Subject: [Repeater-Builder] SCR-200(A) Well, guys, I promised to follow up with the results of my attempt to repair the old Spectrum 1000 with the later model receiver. Thanks to Larry and Joe, I have determined that my receiver is not an SCR200A but probably a later model of the SCR-200. I obtained at least three versions of the schematic from this series receiver thanks to these two gentlemen. Of utmost importance was finding out the transistor part number since my schematic was the wrong version. I was able to replace the front RF amp and get the receiver working again. Before doing that, however, I noted the inadequate wiring, IMHO, in the power supply. The SCR-1000 upgraded PS has plenty of safety factor designed in as far as series pass transistors, etc. but the size of the wires was amazingly small. I completely rewired the high current circuits to match the rest of the design. I am wondering if during the period of this antique repeater there was a shortage of copper and the price was high. After rewiring, the power output of the transmitter was noticeably increased to about 78 watts while it's specified as a 70 watt PA. I took the repeater to a staging area where we had another duplexer to test it on the air. (The actual installation is in the county jail in a jail cell) Distant signals would develop a COR but there was no audio when using the duplexer. When the antenna is directly attached to the receiver with the transmitter on dummy load, it works fine. At this point we were too tired to go further so will get back on it again soon. I suppose the front end may need touching up with that duplexer which has been checked out on another setup. Thanks again to Joe, Larry and the list for their excellent help. 73 de Morris KI4IUA Yahoo! Groups Links Yahoo! Groups Links
RE: [Repeater-Builder] SCR-200(A)
Joe, the duplexer had been tuned by someone else. It did appear to work ok in another lashup with other equipment. I haven't been back to the test site to try it without the transmitter but it could have been desense as the COR worked. I'll have to get my cohort to try it as he is close to the equipment in fact it's at his QTH. You may have guessed by now that I'm new to this facet of radio. I'm beginning to realize how important this desense topic is. Thanks for the great question you pose. We plan another test tomorrow with the transmitter off. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Joe Sent: Friday, March 13, 2009 9:39 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] SCR-200(A) Hello Morris, I'm glad to heard the that you got the receiver working! Just one question, was the test duplexer tuned to the proper frequencies? Was it desense or just loss of sensitivity when using the duplexer? In other words, were you able to hear distant signals with the transmitter turned off? 73, Joe, K1ike Morris Dillingham wrote: Well, guys, I promised to follow up with the results of my attempt to repair the old Spectrum 1000 with the later model receiver. Thanks to Larry and Joe, I have determined that my receiver is not an SCR200A but probably a later model of the SCR-200. I obtained at least three versions of the schematic from this series receiver thanks to these two gentlemen. Of utmost importance was finding out the transistor part number since my schematic was the wrong version. I was able to replace the front RF amp and get the receiver working again. Before doing that, however, I noted the inadequate wiring, IMHO, in the power supply. The SCR-1000 upgraded PS has plenty of safety factor designed in as far as series pass transistors, etc. but the size of the wires was amazingly small. I completely rewired the high current circuits to match the rest of the design. I am wondering if during the period of this antique repeater there was a shortage of copper and the price was high. After rewiring, the power output of the transmitter was noticeably increased to about 78 watts while it's specified as a 70 watt PA. I took the repeater to a staging area where we had another duplexer to test it on the air. (The actual installation is in the county jail in a jail cell) Distant signals would develop a COR but there was no audio when using the duplexer. When the antenna is directly attached to the receiver with the transmitter on dummy load, it works fine. At this point we were too tired to go further so will get back on it again soon. I suppose the front end may need touching up with that duplexer which has been checked out on another setup. Thanks again to Joe, Larry and the list for their excellent help. 73 de Morris KI4IUA Yahoo! Groups Links Yahoo! Groups Links
RE: [Repeater-Builder] Need transistor for SCR200A
Hi again Joe, Would it be possible for you to scan that diagram of the SCR200A that has the MRF901 transistors in the front end? It appears that there are lots more differences. We got this diagram from a source other than the origin of the repeater so it's not what came with the board. Vy 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Joe Sent: Sunday, February 22, 2009 9:30 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Need transistor for SCR200A Hello Morris, My schematic for the SCR-200 dated 5-17-82 shows Q101 as an MRF901 transistor. My schematic dated 7-22-86 shows it as a 6033. 73, Joe, K1ike Morris Dillingham wrote: Hi Guys, I’m new to the list and have been just lurking and reading the mail but now I can use some help finding a replacement transistor. It’s for a Spectrum Communications Corp SCR200A receiver. The transistor in question is the input RF transistor. The schematic is difficult to read for the part number but it appears to be 6033. I can find no cross reference to this and could use either direction to a replacement or a scrapped SCR200A that I can salvage one from. I know it would be best to replace the receiver with a newer one but the club doesn’t want to spend any more money than they have to on this old, old repeater. I have refurbished the power supply and the transmitter and controller had been replaced earlier so I feel it’s worth some effort. Thanks for any help rendered. 73 de Morris KI4IUA Yahoo! Groups Links Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 15:36:00 No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.4/1976 - Release Date: 02/27/09 13:27:00 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Rack mount enclosures
They are plastic but if the other components are in metal boxes it may work out ok. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Sunday, February 22, 2009 11:27 PM To: Repeater-Builder@yahoogroups.com Cc: ge-mast...@yahoogroups.com Subject: RE: [Repeater-Builder] Rack mount enclosures Tim, Scratch and claw no longer. Marlin P. Jones has just what you want, for 20 bucks each. I just bought two of them. Go here: www.mpja.com/prodinfo.asp?number=17086+BX 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Osborne Sent: Sunday, February 22, 2009 7:12 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Rack mount enclosures Hey gang I am tired of scratching and clawing for 1 Rack Unit 19 enclosures for controllers. Does anyone have a source for these at a reasonable price? Thanks Tim Yahoo! Groups Links Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.3/1966 - Release Date: 02/22/09 17:21:00 No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.3/1966 - Release Date: 02/22/09 17:21:00 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Need transistor for SCR200A
Hi Joe, That's a big help. I saw what appeared to be 106 printed on the transistor but the schematic said 6033. With the information you provided it must be a MRF901. All I had to do was stand on my head and read it correctly. It appears that you have the solution to my problem and I am grateful for your response. Thanks to you and the providers of this list for a great resource. 73 de Morris KI4IUA -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Joe Sent: Sunday, February 22, 2009 9:30 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Need transistor for SCR200A Hello Morris, My schematic for the SCR-200 dated 5-17-82 shows Q101 as an MRF901 transistor. My schematic dated 7-22-86 shows it as a 6033. 73, Joe, K1ike Morris Dillingham wrote: Hi Guys, I’m new to the list and have been just lurking and reading the mail but now I can use some help finding a replacement transistor. It’s for a Spectrum Communications Corp SCR200A receiver. The transistor in question is the input RF transistor. The schematic is difficult to read for the part number but it appears to be 6033. I can find no cross reference to this and could use either direction to a replacement or a scrapped SCR200A that I can salvage one from. I know it would be best to replace the receiver with a newer one but the club doesn’t want to spend any more money than they have to on this old, old repeater. I have refurbished the power supply and the transmitter and controller had been replaced earlier so I feel it’s worth some effort. Thanks for any help rendered. 73 de Morris KI4IUA Yahoo! Groups Links Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 15:36:00 No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 15:36:00 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Need transistor for SCR200A
Hi Guys, I’m new to the list and have been just lurking and reading the mail but now I can use some help finding a replacement transistor. It’s for a Spectrum Communications Corp SCR200A receiver. The transistor in question is the input RF transistor. The schematic is difficult to read for the part number but it appears to be 6033. I can find no cross reference to this and could use either direction to a replacement or a scrapped SCR200A that I can salvage one from. I know it would be best to replace the receiver with a newer one but the club doesn’t want to spend any more money than they have to on this old, old repeater. I have refurbished the power supply and the transmitter and controller had been replaced earlier so I feel it’s worth some effort. Thanks for any help rendered. 73 de Morris KI4IUA No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.1/1961 - Release Date: 02/19/09 18:45:00 No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 15:36:00
