RE: [Repeater-Builder] Wanted: Mitrek channel elements (UHF)
George, I have a KXN1086 on what appears to be 47x.8625. (Can't tell the exact freq - the label is pretty beat-up). If this is of any use to you, it's yours for the asking... Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of George Henry Sent: Tuesday, February 27, 2007 3:20 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Wanted: Mitrek channel elements (UHF) Does anyone have the following Mitrek elements: KXN1088 on or near 462.600 KXN1086 on or near 467.600 (10.7 IF) Thanks. George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Narrowbanding
George, With the upsurge in FRS equipment this might be a worthwhile modification. Since the standard GMRS channels are 25K spaced and the FRS channels are dropped in between both the inputs and the outputs it is possible that a standard 25K rx will receive portions of the audio from adjacent FRS channels. Using narrower filters will cut down on reception of the adjacent channels. There is however a gotcha...other 25K users. The exact action the filters will have is hard to describe. The wider deviation users might sound more distorted, they will sound louder, and weaker wider bandwidth signals may not be heard. If you have control of the other transceivers that you will be communicating with, you can turn down the TX deviation to 3KHz which will easilly pass thru a narrowband filter. Good luck Milt N3LTQ - Original Message - From: George Henry [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, February 27, 2007 9:36 AM Subject: Re: [Repeater-Builder] Narrowbanding -Original Message- From: George Henry [EMAIL PROTECTED] Sent: Feb 26, 2007 11:09 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Narrowbanding [snip] Just wondering if it was worth doing or not, particulary for a GMRS repeater the potential for FRS interference. DOH!! No sooner did I shut the computer down and crawl into bed, than I realized I was thinking upside-down - the FRS channels are between the repeater OUTPUTS, not the inputs! (Must be that NorCal vs. SoCal repeater thread that got me confused) So anyway, in a high RF environment like Chicagoland, is it worth doing? I'm probably 30 miles from the next nearest GMRS repeater, and the user base seems to be pretty localized. George, KA3HSW / WQGJ413 Yahoo! Groups Links
Re: [Repeater-Builder] Re: Uniden 220 repeater, Software info needed
Hi Skipp I think you'll be interested if you know that all the unit are new and still on original box. (MRS204EX-220 MHZ narrow band repeater) they have 24 unit for $50.00 each (ARX2125Z-110 watt 220MHZ RF P.A.) they have 12 unit for $125.00 each. you can find them at... http://www.relmwireless.com/sections/closeouts/pages/Systems/220-f.asp Thank you for your info Camilo - Original Message -From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Tuesday, February 27, 2007 12:17 PM Subject: [Repeater-Builder] Re: Uniden 220 repeater, Software info needed The repeater is pretty much useless unless you have everything to place it in service... and I mean everything. Uniden Land Mobile Radio is pretty much long gone so there's not much available to support any use of this equipment. The amplifier lends itself to conversion to Amateur (Ham) SSB and FM operation. A thread about the amplifier has been posted on the yahoo rfamplifiers group. http://groups.yahoo.com/group/rfamplifiers/ You can also look up the amplifier and its conversion by n2ckh on his web page. Maybe you can find some archive Uniden Software... but for this unit it's going to be an elusive beast. good luck... cheers, skipp Camilo So [EMAIL PROTECTED] wrote: I just purchased a brand new Uniden MRS204EX 220 MHZ narrow band repeater and Uniden ARX2125 125watt RF PA, the repeater is a CPU programmable, and this unit is a Uniden 220 MHZ prototype repeater, that comes with no software info or manual, I hope someone here knows a Uniden repeater software for 2 meter that I can buy to program this unit, or a 2 meter Uniden repeater manual that I can buy for reference to this unit. Thank you. W4CSO
Re: [Repeater-Builder] Desense
On 2/26/07, Jeff Kashinsky [EMAIL PROTECTED] wrote: I am building a 440 portable repeater out of a pair of GM300 radios and a Harris Alpha mobile duplexer. I believe that I tuned the duplexer properly and it notches the xmit signal by about 55db on the receive side. Using my signal generator as a source, it takes about 10db more signal to key the contoller with the transmitter on than with it off. I am wondering if this is normal or if I have more work to do. Depends on if you want it to work well or not. :-) I vote, more work. Are your measurements made when terminated into a good quality 50 ohm dummy load, or a real antenna system? Is there noise on your receive frequency (if hooked to an antenna)? Make sure you're using double-shielded good quality cables and connectors -- keep all that TX RF *in* the cables, and (hopefully) headed out the antenna. You don't want the TX cable leaking directly into the jumper from the receive side of the duplexer into the RX. (Kinda makes the duplexer worthless, ya know?) What power level is your TX set at? If you know you have 55dB of isolation, how much do you need to remove at the RX frequency? Is the TX clean? Do you have less desense if you turn the TX power down? What's the VSWR look like? Etc... Work from known things toward the unknown. You know (if you've tested it) at what level your receiver receives. You know how much power the TX is producing. You know if your antenna system is radiating all the power, or if some is getting reflected in the cabling. You next need to know what the TX does 5 MHz away, and whether or not 55dB of isolation is enough. Nate WY0X
Re: [Repeater-Builder] GE
Ralph; Best case for nowit can be modified for 900 rx with information available at this time.. even that is a lot of work Many better donor radios to work with that are already in 900... Most radios with 800 brick VCO's do not move well.. many will rx, but most to none will tx without significant surgery Feel free to look us up if you want... but this is the short answer to what you ask... Doug KD8B asst moderator [EMAIL PROTECTED] At 02:06 PM 2/26/2007, you wrote: Does anyone on the list know anything about GE TMX8712 I am told that it is a 800 mhz unit. Will it convert to the 902-928 band Thanks in advance. Ralph, W7HSG From:Jeff Kashinsky [EMAIL PROTECTED] To:Repeater-Builder@yahoogroups.com Subject:[Repeater-Builder] Desense Date:Mon, 26 Feb 2007 18:45:58 + Content-Type: Multipart/alternative; boundary=NextPart_Webmail_9m3u9jl4l_14401_1172516787_1 I am building a 440 portable repeater out of a pair of GM300 radios and a Harris Alpha mobile duplexer. I believe that I tuned the duplexer properly and it notches the xmit signal by about 55db on the receive side. Using my signal generator as a source, it takes about 10db more signal to key the contoller with the transmitter on than with it off. I am wondering if this is normal or if I have more work to do. Thanks in advance for your input. Jeff W2UA
[Repeater-Builder] Re: Uniden 220 repeater, Software info needed
Hi Camilo, Thanks much... yes I purchased a number of the arx-2125 pa units from BKRelm in the past. But getting them to work on the 224 MHz ham band is not so easy. N2CKH and myself are probably the only two hams actually using the amplifiers in Amateur Service. At this point in time I'd say the Amplifiers are not a practical conversion for the casual person (Amateur). The problem with the repeater is... who has a radio to talk through it I will say... A number of us out here on the US West Coast are playing around with the original SEA format ACSB radios... but they are pretty much over time going by the wayside. cheers, skipp Camilo So [EMAIL PROTECTED] wrote: Hi Skipp I think you'll be interested if you know that all the unit are new and still on original box. (MRS204EX-220 MHZ narrow band repeater) they have 24 unit for $50.00 each (ARX2125Z-110 watt 220MHZ RF P.A.) they have 12 unit for $125.00 each. you can find them at... http://www.relmwireless.com/sections/closeouts/pages/Systems/220-f.asp Thank you for your info Camilo - Original Message -From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Tuesday, February 27, 2007 12:17 PM Subject: [Repeater-Builder] Re: Uniden 220 repeater, Software info needed The repeater is pretty much useless unless you have everything to place it in service... and I mean everything. Uniden Land Mobile Radio is pretty much long gone so there's not much available to support any use of this equipment. The amplifier lends itself to conversion to Amateur (Ham) SSB and FM operation. A thread about the amplifier has been posted on the yahoo rfamplifiers group. http://groups.yahoo.com/group/rfamplifiers/ You can also look up the amplifier and its conversion by n2ckh on his web page. Maybe you can find some archive Uniden Software... but for this unit it's going to be an elusive beast. good luck... cheers, skipp Camilo So socamilo@ wrote: I just purchased a brand new Uniden MRS204EX 220 MHZ narrow band repeater and Uniden ARX2125 125watt RF PA, the repeater is a CPU programmable, and this unit is a Uniden 220 MHZ prototype repeater, that comes with no software info or manual, I hope someone here knows a Uniden repeater software for 2 meter that I can buy to program this unit, or a 2 meter Uniden repeater manual that I can buy for reference to this unit. Thank you. W4CSO
[Repeater-Builder] IC-FR4000
Can anyone tell me the features of the internal controller for the IC-FR4000 repeater from Icom. I have sent Icom America, in Bellevue, an email with no reponse yet. Info on the web site is vague. TIME OUT TIMER? TX HOLD TIME? CW ID SPEED? CW FREQ ADJUST? SINGLE OR MULTI DIGIT DTMF CONTROL? COURSITY TONES? ETC THANKS Barry
[Repeater-Builder] Microwave Associates (M/A-COM) PM2-MF Power Monitor
I'm looking for any documentation I can find for an old (maybe 3+ decades old) Microwave Associates PM2-MF power monitor. It's a typical dual direction in-line monitor with outputs for FWD and REV power, N male to N female connectors. I've talked to several people at M/A-COM and they can't tell me anything. I'd like to know if the unit is OK for use in the 70cm band at 50+ watts.
[Repeater-Builder] Re: Q2220E to 220 MHz Duplexer Project - First Draft Ready
The extra length of the VHF cavity used for the 220MHz duplexer should do nothing to the tuning, insertion loss or notch depths. I suspect there may be another issue with your observed results. Did you measure the poor performance without tightening or inserting ALL the screws on the top plate? I know for a fact that the length will not effect the performance of the cavity once the length of the resonator bottom is beyond the capacitive tuning effects. There is no effect of the bottom cover/cap except for dust protection. Harold (ex Sinclair systems engineer) --- In Repeater-Builder@yahoogroups.com, holycow619593 [EMAIL PROTECTED] wrote: I've noticed that without reducing the size of the cavities, the depth of the notches would only reach 60dB. When I reduced the length of the cavities with a block inserted up the bottom of the cavity, the notch achieved 80dB and the insertion loss dropped from around 3dB to less than 1.2dB. I've read on a number of posts others have found the length of the cavities didn't matter. As a test, after tuning the modified duplexer, I tested the unit on a service monitor with a 50W repeater. The receiver desense on TX was well in excess of 6dB, indicating a lack of isolation after tweaking the trimmer capacitors. Upon reducing the cavity length and slightly retuning the notch points with the capacitors, the duplexer now exhibited 85+dB of isolation, and no appreciable desense on transmit. As a seasoned commercial tech with many years working on Sinclair products, I found that until I reduced the cavity length, the duplexer would not achieve spec. Does anyone have the length of the coupling loops for the Q2221E?
[Repeater-Builder] Duplexer info
Where is a good source of information (including manuals and curves) on the web for Decibel Duplexers? I would like more information than the list of duplexers given on RB. Thanks. Kent W7AOR
[Repeater-Builder] Duplexer info
Where is a good source of information (including manuals and curves) on the web for Decibel Duplexers? I would like more information than the list of duplexers given on RB. Thanks. Kent W7AOR
Re: [Repeater-Builder] Duplexer info
At 03:13 PM 2/28/2007, you wrote: Where is a good source of information (including manuals and curves) on the web for Decibel Duplexers? I would like more information than the list of duplexers given on RB. ---How about DB themselves? http://www.decibelproducts.com/ Ken -- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller 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
RE: [Repeater-Builder] Re: 220 repeater receiver recommendations?
At 2/28/2007 08:19 AM, you wrote: Bob You seem to want to lump what is characteristically a complex impedance (R+or-jX) into a single number in order to simplify your argument that a non conducting RF output transistor is an open circuit because the transistor is not having any RF drive to the base (as in a class C amp with no current flowing in the collector / emitter circuit), and ignoring the Xc or XL remaining which will and is being transformed to an impedance different than the impedance originally designed to operate into as a load (50 ohms). Even then your argument again fails because the transformed complex impedance (+or-jX) will result in a source impedance from the transistor into something also complex, either capacitive or inductive, with little or no resistive component, and is never seen or sourced as a high impedance by any stretch of the imagination. I use the term high impedance loosely here to mean no resistive component, hence quasi-infinite VSWR, low return loss, mag. S11~=1 or however you want to put it. In reality, the impedance at the collector of the transistor is going to be pretty high. Yes it gets transformed around the Smith chart to a capacitance, through a short @ 1/4 wavelength, then inductive back to an open as you move away from it but I think that's irrelevent to this discussion. Why do you think that this (high impedance) is the case? Even in RF amplifiers operated as class A or AB, there is always current flow thru I'm talking about class C amplifiers, the ones normally found in repeater RFPAs. They draw no current when not TXing. Bob NO6B
[Repeater-Builder] astron rs 35a
my power supply keeps blowing the fuse changed the pc board i dont know where to go nent any help is apperacited thanks kd5ntp
Re: [Repeater-Builder] astron rs 35a
Pass transistors are the usual culprit. Gary k7ney - Original Message - From: mike To: Repeater-Builder@yahoogroups.com Sent: Wednesday, February 28, 2007 5:17 PM Subject: [Repeater-Builder] astron rs 35a my power supply keeps blowing the fuse changed the pc board i dont know where to go nent any help is apperacited thanks kd5ntp
Re: [Repeater-Builder] astron rs 35a
Usually one or more of the diode rectifiers on the chassis short out. This causes the main 8A fuse to blow rather quickly. I had this happen to two RS35 supplies in the last 6 months. However the main filter capacitor could also be bad. At least that's easy to disconnect and measure with an ohm-meter. The only way to tell for sure is to completely unsolder them and measure all the diodes with an ohm-meter. If anything is open or shorted, replace them. Older supplies will have two stud diodes, others will have two square bridge rectifiers wired in parallel. I found someone on eBay selling 1000V 50A bridge rectifiers for about $5. I used one of these in my last RS35 to replace the pair of 100V 35A bridge rectifiers put in at the factory. So far it's working fine. Easy fix once you have the new parts. Bob M. == --- mike [EMAIL PROTECTED] wrote: my power supply keeps blowing the fuse changed the pc board i dont know where to go nent any help is apperacited thanks kd5ntp TV dinner still cooling? Check out Tonight's Picks on Yahoo! TV. http://tv.yahoo.com/
[Repeater-Builder] Bird stuff FS
Excess to my needs (early spring garage cleaning) Bird Equipment for sale Bird Model# 8166 Termaline Coaxial Resistor, 150 watts, 50 ohm, DC to 2.5Ghz. UHF quick change connector. Good condition. $75.00 Bird Model# 8343-100 Tenuline Coaxial Resistor, 10dB, 100 watts, DC to 1Ghz Type N quick change connectors. Good conditions. Have 3 of these, $40.00 each. Plus shipping from Chicago area (60134). Have PDF's of the instruction manuals Contact me off list if interested at: N9MEP at AOL dot COM ThanksGerry N9MEP BRBRBR**BR AOL now offers free email to everyone. Find out more about what's free from AOL at http://www.aol.com.
[Repeater-Builder] Re: Microwave Associates (M/A-COM) PM2-MF Power Monitor
The PM2-MF power monitor is the power detector portion of the M/A-Com Centralized RF Power Monitoring System. The 2 in the part number indicates that it is a dual monitor [forward reflected] whereas there was also a PF1 detector available that monitors only forward power. The MF part of the part number indicates the standard [insertable] male-female connector configuration. Other connector configurations were available. These detectors were used with the PMR10 detector readout meter panel. The system was designed to monitor transmitter combiners, especially in the 406-512 MHZ and 806-890 MHz frequency ranges. Typically, each transmitter had a PM1 detector to monitor its output power. The PM2 monitor was used between the combiner output and the antenna where it could monitor the total RF output as well as reflected power. A rotary switch on the meter panel allows selection of one of 10 transmitter detectors plus there are two additional positions to select the antenna forward and reflected power. An option provided up to 10 toggle switches for remote keying of the associated transmitters. The system was useable at frequencies from 30 to 960 MHz. Calibration of the PMR10 meter reading to a reference Wattmeter is accomplished by volmeter adjustments on the PM detectors. These are accessable through small holes adjacent to the detector connection feedthrough capacitors. The meter on the panel has ranges of 50 Watts, 150 Watts, and 500 Watts.
Re: [Repeater-Builder] Spectrum SCR500
I've got a 2 meter SCR500 here and the manual. Mine is the black faced panel. The manual says the crystal should be 3rd overtone crystal in the 50-85Mhz range. This receiver came in 30-50, 66-88, 136-151, 151.001-174, and 406-512MHZ versions. Joe At 12:11 AM 2/27/2007 -0800, you wrote: Hello Group, I have just acquired a Spectrum SCR 500 receiver in the rack-mount configuration with the built -in power supply. It looks in very good shape for its age (being in the beige panel color , not the black/charcoal newest colors). The problem I have is that I received no documentation with it, It has a six channel crystal switch on it with one crystal installed, 45.0333 MHz. There are no identifiers on any of the boards, or any where else on the unit. I didn't take the boards out to see if marked on bottoms. I would much appreciate any info, schematics, or helpful criticism on this. I am willing to pay for copying and mail charges, just buy outright, or easier yet, any pdf scans to save a tree. Thanks in advance, Nick WB7PEK No need to miss a message.
[Repeater-Builder] IFR-1100S or GRM-114A
Hello List, Does anyone know where I can acquire or download an IFR-1100S or GRM-114A service manual or even just a schematic? Thus far, all I've been able to find is a calibration document that has no schematic. Since my problem is power supply related, the 1000S manual available everywhere is of little use. Thanks, Eric
RE: [Repeater-Builder] Duplexer info
Kent, Please be more specific. What is the model number of the duplexer for which you need information, what frequencies is it currently tuned to, and what frequencies do you want to tune it to? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Nevada Amateur Radio Repeaters, Inc. Sent: Wednesday, February 28, 2007 3:13 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Duplexer info Where is a good source of information (including manuals and curves) on the web for Decibel Duplexers? I would like more information than the list of duplexers given on RB. Thanks. Kent W7AOR
Re: [Repeater-Builder] astron rs 35a
The pass transistors are shorted, unless lightning shorted the rectifiers. Hopefully the fuse was correct and blew before the transformer was damaged. 73 Glenn WB4UIV At 07:17 PM 02/28/07, you wrote: my power supply keeps blowing the fuse changed the pc board i dont know where to go nent any help is apperacited thanks kd5ntp Yahoo! Groups Links
