Re: [Repeater-Builder] Yet Another split antenna Question
Wow! count your blessings and proceed! Lee,K4LJP 73 On Thu, Dec 18, 2008 at 12:04 AM, kb5vjy jholl...@nbc10news.net wrote: Folks, I have read just about every split antenna post that I can find.. I hate to be a yet another poster but here is my situation. I just want to know if it is do able. And what problems I might run into. After months of waiting, I have been issued a repeater pair of 147.255 for a long range 2m repeater that will be installed. This is my first 2m repeater, but I do have 3 70cm repeaters (all Mastr II's).. My situation is the following: I have a Mastr II Station 100w Cont. Duty PA for the project... I still have to order the xtals. I will run a PL as needed on 127.3. The controller will be a CAT (version unsure of) I have a 2000' broadcast tower with a platform at 1300' and another at 1000'. There is a DB 224 mounted under the 1300' and one under the 1000' platform with a section of 7/8 feedline running from the top platform and the bottom platform. There is a full rack size NEMA 12 enclosure on the 1300' platform. After Feb '09 there will be NO VHF transmitting equipment on this tower at all. The closest transmitter is 6 miles away. What I would like to do, is mount the radio in the enclosure at the top platform. Use the top DB 224 for the Receive antenna, and the 1000' DB 224 for the Transmit antenna. What are the problems that I will run into with this situation, and should I look for some type of filter for the receiver. I do plan on putting an APRS Digi at 1300' as well moving one of my 70cm repeaters to the same platform some time early next year. Any comments would be helpful. Thanks.. 73 de Joe KB5VJY Sorry.. RTTY dayz!
Re: [Repeater-Builder] Yet Another split antenna Question
all I can say is WOW You lucky dog ! Whose tower, Joe ? Gary - Original Message - From: kb5vjy To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 17, 2008 11:04 PM Subject: [Repeater-Builder] Yet Another split antenna Question Folks, I have read just about every split antenna post that I can find.. I hate to be a yet another poster but here is my situation. I just want to know if it is do able. And what problems I might run into. After months of waiting, I have been issued a repeater pair of 147.255 for a long range 2m repeater that will be installed. This is my first 2m repeater, but I do have 3 70cm repeaters (all Mastr II's).. My situation is the following: I have a Mastr II Station 100w Cont. Duty PA for the project... I still have to order the xtals. I will run a PL as needed on 127.3. The controller will be a CAT (version unsure of) I have a 2000' broadcast tower with a platform at 1300' and another at 1000'. There is a DB 224 mounted under the 1300' and one under the 1000' platform with a section of 7/8 feedline running from the top platform and the bottom platform. There is a full rack size NEMA 12 enclosure on the 1300' platform. After Feb '09 there will be NO VHF transmitting equipment on this tower at all. The closest transmitter is 6 miles away. What I would like to do, is mount the radio in the enclosure at the top platform. Use the top DB 224 for the Receive antenna, and the 1000' DB 224 for the Transmit antenna. What are the problems that I will run into with this situation, and should I look for some type of filter for the receiver. I do plan on putting an APRS Digi at 1300' as well moving one of my 70cm repeaters to the same platform some time early next year. Any comments would be helpful. Thanks.. 73 de Joe KB5VJY Sorry.. RTTY dayz! -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.9.19/1854 - Release Date: 12/17/2008 7:21 PM
Re: [Repeater-Builder] Yet Another split antenna Question
Here is yet another approach from back in the '70s: The 146.94 repeater in Ft Worth was located on a 1000 ft tower on the east side of the city. It utilized a solid state converter for 2 meters down to the 10 meter band where plenty of low band receivers would work. I think it used a piece of RG-58 to route the 10 meter signal to the bottom of the tower. The transmitter was located at the 500 ft level and several transmitters were utilized. a separate 145.76 repeater was implemented from this same receive antenna with a directional antenna to serve Ft Worth only. Receivers for 146.34, 146.94, 146.16 and maybe 146.76 were all connected to the 10 meter down converter output. Receiver outputs were all routed to 440 transmitters and receivers to allow interconnect at a trustee's home. I once saw this system work a skip situation with the 146.94 repeater in Little Rock Arkansas where a station on the Ft Worth repeater was repeated on the Little Rock repeater and a station on the Little Rock repeater was repeated on the Ft Worth repeater. Granted when the Little Rock repeater stood down, the Ft Worth repeater would howl, but as soon as a signal appeared on 146.94 the incoming signal would override the local .94 output and through the 440 link it was repeated back on the local .94 transmitter. I never knew how much isolation this represented, but it was really a nice set up for a repeater system. Alas - it all went away when the 1000 ft tower was removed. I worked this repeater regularly from my mobile Progress Line 60 watt radio in Greenville, TX - 90 miles away. 73 - Jim W5ZIT --- On Wed, 12/17/08, kb5vjy jholl...@nbc10news.net wrote: From: kb5vjy jholl...@nbc10news.net Subject: [Repeater-Builder] Yet Another split antenna Question To: Repeater-Builder@yahoogroups.com Date: Wednesday, December 17, 2008, 11:04 PM Folks, I have read just about every split antenna post that I can find.. I hate to be a yet another poster but here is my situation. I just want to know if it is do able. And what problems I might run into. After months of waiting, I have been issued a repeater pair of 147.255 for a long range 2m repeater that will be installed. This is my first 2m repeater, but I do have 3 70cm repeaters (all Mastr II's).. My situation is the following: I have a Mastr II Station 100w Cont. Duty PA for the project... I still have to order the xtals. I will run a PL as needed on 127.3. The controller will be a CAT (version unsure of) I have a 2000' broadcast tower with a platform at 1300' and another at 1000'. There is a DB 224 mounted under the 1300' and one under the 1000' platform with a section of 7/8 feedline running from the top platform and the bottom platform. There is a full rack size NEMA 12 enclosure on the 1300' platform. After Feb '09 there will be NO VHF transmitting equipment on this tower at all. The closest transmitter is 6 miles away. What I would like to do, is mount the radio in the enclosure at the top platform. Use the top DB 224 for the Receive antenna, and the 1000' DB 224 for the Transmit antenna. What are the problems that I will run into with this situation, and should I look for some type of filter for the receiver. I do plan on putting an APRS Digi at 1300' as well moving one of my 70cm repeaters to the same platform some time early next year. Any comments would be helpful. Thanks.. 73 de Joe KB5VJY Sorry.. RTTY dayz!
[Repeater-Builder] Re: LMR600 in Duplex radio?
Where can one find this article about the iden work up. Ryan n3ssl
[Repeater-Builder] MSF 5000 vhf power amp TLD2692A manual query
Hi, I've got an MSF 5000 VHF power amp, TLD2692A. Does anyone have a manual for this beast, or can you point me to a link for one? My meager attempts at google-fu didn't show anything that I could identify as such, nor any on eBay, nor R-B website. Thanks so much for reading, especially if you can help! 73, George K9TRV (Technical Coordinator for ARROW, W8PGW.org)
[Repeater-Builder] Re: E.F. Johnson Repeaters
James I'm not sure when you contacted ICM about re rocking your TCXO but I had no problem with them in July 2008. I sent them 2 TCXO's. They were rocked and compensated and returned in less than 2 weeks. These were for the CR1010. Catalog # Description 41534 JOHNSON#521-3(518-2)TX(440-474)CR101 41533 JOHNSON#521-2(518-2)RX(440-474)CR101 37006 ICM TO INSTALL,TEMP/COMP TEST Maybe you should call ICM back. They are still listed in the current catalog. Tony 2c. Re: E.F. Johnson Repeaters Posted by: n0qzv_jhorn jah...@mahaska.org n0qzv_jhorn Sun Dec 14, 2008 8:07 pm (PST) I have a CR 1010 repeater that I have crystaled for the ham band. The first place I called was ICM and they did not want to work on the TCXOs at all.
[Repeater-Builder] VXR 7000 with desense
Hi, I've checked the previous posts on this issue, but I am hoping that there is more light to be shed. We have a VXR 7000 that has had issues for a while as a two meter repeater. In the shop we set it up with its DB 4026 duplexer and 50 ohm dummy load and monitored the output power with a Bird thru line watt meter. We used a service monitor to inject the RX signal to get 10 dB quieting (approx 0.2 micro volt). Put the unit into repeat mode and the repeater will cycle (go in and out of transmit) until the RX signal is increased about 20 to 25 dB (approx 3.6 micro volt). Looking at what is coming in the receive port with the transmitter is keyed is about -75 dBw (50 watt out with about 95 dB of isolation) at the TX frequency, and there is little to no hash at the RX frequency - seeing the noise floor of the spectrum analyzer (-120 dB). Put the 7000 into base station mode, hooked up second signal source, set first signal source to give 10 dB quieting at the RX frequency (0.2 uV), set the second signal source to emulate what we saw from the duplexer (79 mV at TX frequency) and there was no desense. Increased the simulated TX voltage to better than 1 volt and still no desense. My thought is that something has gone bad internally within the 7000. Is there something else I need to try? Thanks in advance for your help. Regards, Rick, N5RB
[Repeater-Builder] RE: What Have I got and can I get information about it.
I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
Re: [Repeater-Builder] VXR 7000 with desense
Rick; I think you need to isolate whether it is tx through the duplexer or something else bothering the rx and or squelch. It sounds like the tx signal fundamentally is clean from your analysis so far.. in order to isolate through the duplexer, connect the tx directly to a dummy load instead of it's side of the duplexer while injecting rx into the duplexer. if it does not cycle, the tx is sending something through the duplexer to the rxif it does cycle.. it is an internal issue as you suspect.. I would use the tx to duplexer cable in the dummy load path as you want to see if some radiation from it is part of the equation. I lean more to spurious on initial keyup... causing a noise burst maybe due to exciter tuning... but this test should tell you if it is conducted internally or passed through the duplexer. Doug KD8B At 05:04 PM 12/17/2008, you wrote: Hi, I've checked the previous posts on this issue, but I am hoping that there is more light to be shed. We have a VXR 7000 that has had issues for a while as a two meter repeater. In the shop we set it up with its DB 4026 duplexer and 50 ohm dummy load and monitored the output power with a Bird thru line watt meter. We used a service monitor to inject the RX signal to get 10 dB quieting (approx 0.2 micro volt). Put the unit into repeat mode and the repeater will cycle (go in and out of transmit) until the RX signal is increased about 20 to 25 dB (approx 3.6 micro volt). Looking at what is coming in the receive port with the transmitter is keyed is about -75 dBw (50 watt out with about 95 dB of isolation) at the TX frequency, and there is little to no hash at the RX frequency - seeing the noise floor of the spectrum analyzer (-120 dB). Put the 7000 into base station mode, hooked up second signal source, set first signal source to give 10 dB quieting at the RX frequency (0.2 uV), set the second signal source to emulate what we saw from the duplexer (79 mV at TX frequency) and there was no desense. Increased the simulated TX voltage to better than 1 volt and still no desense. My thought is that something has gone bad internally within the 7000. Is there something else I need to try? Thanks in advance for your help. Regards, Rick, N5RB
RE: [Repeater-Builder] RE: What Have I got and can I get information about it.
Rick, Without model numbers, it is difficult to know what you have. However, I can help with the N1275A power amplifier. It was intended to be used with the N1248A Converta-Com console, and it increased the RF power of the handheld radio from 4.0 watts to 35 watts. You probably have the NLE8912A version- the most common- which is designed to operate in the 450-470 MHz band. The N1275A manual is still available from Motorola Parts. It is part number 6881020C85, and costs about $15. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Rick Beatty Sent: Wednesday, December 17, 2008 9:37 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
RE: [Repeater-Builder] VXR 7000 with desense
Rick, You might check to see if the internal jumpers inside the VXR-7000 cabinet are single-shielded. I had a VXR-5000 UHF repeater that had single-shield jumpers with gray jackets and no markings, and had a small amount of desense. Once I replaced all three jumpers with RG-400/U double-shielded cable, there was no trace of desense. Perhaps Vertex tried the same money-saving trick on the later model. Check to make sure that all shields and cover plates are installed, with no screws missing. I wonder if your duplexer has been mis-identified. A DB4026 is a UHF bandpass cavity filter, not a duplexer. You probably meant DB4062, which is a six-cavity VHF BpBr duplexer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of pontotochs Sent: Wednesday, December 17, 2008 2:04 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] VXR 7000 with desense Hi, I've checked the previous posts on this issue, but I am hoping that there is more light to be shed. We have a VXR 7000 that has had issues for a while as a two meter repeater. In the shop we set it up with its DB 4026 duplexer and 50 ohm dummy load and monitored the output power with a Bird thru line watt meter. We used a service monitor to inject the RX signal to get 10 dB quieting (approx 0.2 micro volt). Put the unit into repeat mode and the repeater will cycle (go in and out of transmit) until the RX signal is increased about 20 to 25 dB (approx 3.6 micro volt). Looking at what is coming in the receive port with the transmitter is keyed is about -75 dBw (50 watt out with about 95 dB of isolation) at the TX frequency, and there is little to no hash at the RX frequency - seeing the noise floor of the spectrum analyzer (-120 dB). Put the 7000 into base station mode, hooked up second signal source, set first signal source to give 10 dB quieting at the RX frequency (0.2 uV), set the second signal source to emulate what we saw from the duplexer (79 mV at TX frequency) and there was no desense. Increased the simulated TX voltage to better than 1 volt and still no desense. My thought is that something has gone bad internally within the 7000. Is there something else I need to try? Thanks in advance for your help. Regards, Rick, N5RB
Re: [Repeater-Builder] VXR 7000 with desense
I don't know what type of service monitor you are using, but I tend to use an iso-tee to measure desense with the duplexer hooked to a dummy load through the iso-tee. It might be possible for the service monitor to contribute to some signal reflection if it is used as the power termination. Make sure the cables to the duplexer are double shielded, like RG-214, and inspect the connectors to make sure all the grounds are in good shape. Check the internal cables in the VXR-7000 for the same potential problems. I may be preaching to the choir and if so I apologize. 73 - Jim W5ZIT --- On Wed, 12/17/08, pontotochs pontoto...@bellsouth.net wrote: From: pontotochs pontoto...@bellsouth.net Subject: [Repeater-Builder] VXR 7000 with desense To: Repeater-Builder@yahoogroups.com Date: Wednesday, December 17, 2008, 4:04 PM Hi, I've checked the previous posts on this issue, but I am hoping that there is more light to be shed. We have a VXR 7000 that has had issues for a while as a two meter repeater. In the shop we set it up with its DB 4026 duplexer and 50 ohm dummy load and monitored the output power with a Bird thru line watt meter. We used a service monitor to inject the RX signal to get 10 dB quieting (approx 0.2 micro volt). Put the unit into repeat mode and the repeater will cycle (go in and out of transmit) until the RX signal is increased about 20 to 25 dB (approx 3.6 micro volt). Looking at what is coming in the receive port with the transmitter is keyed is about -75 dBw (50 watt out with about 95 dB of isolation) at the TX frequency, and there is little to no hash at the RX frequency - seeing the noise floor of the spectrum analyzer (-120 dB). Put the 7000 into base station mode, hooked up second signal source, set first signal source to give 10 dB quieting at the RX frequency (0.2 uV), set the second signal source to emulate what we saw from the duplexer (79 mV at TX frequency) and there was no desense. Increased the simulated TX voltage to better than 1 volt and still no desense. My thought is that something has gone bad internally within the 7000. Is there something else I need to try? Thanks in advance for your help. Regards, Rick, N5RB
Re: [Repeater-Builder] MSF 5000 vhf power amp TLD2692A manual query
I've got a manual that has that PA in it. Not much there except a power splitter, two FET PA modules (undocumented), a power combiner, and a power sensor. There's some troubleshooting charts and some parts lists, but absolutely nothing on the actual PA modules themselves. Most of the sheets are big fold-outs. Those with circuit board layouts are in color. It would take considerable time to scan them, plus it would be a very big file. Easier to make copies at the local copy center, but that wouldn't happen for several days and would cost several dollars plus postage. I can give you specific info from the manual a lot faster. Bob M. == --- On Sun, 12/14/08, ghbyrkit ghbyr...@chartermi.net wrote: From: ghbyrkit ghbyr...@chartermi.net Subject: [Repeater-Builder] MSF 5000 vhf power amp TLD2692A manual query To: Repeater-Builder@yahoogroups.com Date: Sunday, December 14, 2008, 11:54 AM Hi, I've got an MSF 5000 VHF power amp, TLD2692A. Does anyone have a manual for this beast, or can you point me to a link for one? My meager attempts at google-fu didn't show anything that I could identify as such, nor any on eBay, nor R-B website. Thanks so much for reading, especially if you can help! 73, George K9TRV (Technical Coordinator for ARROW, W8PGW.org)
[Repeater-Builder] Re: What Have I got and can I get information about it.
I believe the Systel repeater is basically a pair of GP300 handheld radio chassis in a box. I remember reprogramming one of these by removing the top cover removing each GP300 from an adapter that was located where the portable battery was normally. A standard GP300 cable, RIB box and GP300 RSS was then used to change frequencies PL. --- In Repeater-Builder@yahoogroups.com, Eric Lemmon wb6...@... wrote: Rick, Without model numbers, it is difficult to know what you have. However, I can help with the N1275A power amplifier. It was intended to be used with the N1248A Converta-Com console, and it increased the RF power of the handheld radio from 4.0 watts to 35 watts. You probably have the NLE8912A version- the most common- which is designed to operate in the 450-470 MHz band. The N1275A manual is still available from Motorola Parts. It is part number 6881020C85, and costs about $15. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Rick Beatty Sent: Wednesday, December 17, 2008 9:37 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
Re: [Repeater-Builder] RE: What Have I got and can I get information about it.
Rick, The Systel was a 2 watt repeater with a telephone interconnect designed for small on-site systems. I doubt that it would be type accepted for GMRS as it was based on one or more series of portables (HT-90 and/or GP300). Of course the phone patch would not be usable on GMRS either. MIlt N3LTQ - Original Message - From: Rick Beatty To: Repeater-Builder@yahoogroups.com Sent: Thursday, December 18, 2008 12:37 AM Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
[Repeater-Builder] New Communications Technology
New Communications Technology Very interesting , Laymen terms would have been nice LOL Enjoy http://www.youtube.com/watch?v=ewa9F4roB4E Happy Holidays Bless our Troops around the World Don KA9QJG
RE: [Repeater-Builder] RC96 manual
Joe, I get the same message when trying to download the file. I have a hard copy but no electronic copy. Let me know if you want me to copy it for you. John Transue -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Joe Sent: Wednesday, December 17, 2008 9:57 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] RC96 manual I tried to download a copy of the RC96 manual at: http://www.repeater-builder.com/acc/pdfs/ACC-RC-96-Manual-All.pdf and it says the file is damaged. Are there any other copies available? 73, Joe, K1ike Yahoo! Groups Links __ NOD32 3700 (20081217) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
[Repeater-Builder] Salsa on the Repeater (FM Station Heard on Repeater Carrier)
Recently the N4CLA 145.47mhz. 2 meter repeater in Atlanta, Ga., had an issue with an FM Station's music showing up on the Repeaters Carrier. It was down in the background but clearly heard. The repeater is located on a mountain with many others and 2x50KW FM stations and 5 TV stations including 1 digital station. The FM Station antenna is just across the street about 100 feet away from the repeater antenna. The antenna and feedline couple lots of RF from the FM station into the repeater shack. The FM station upgraded to HD. The Salsa started (it's a station that plays salsa style music). After a couple of trips up to the site with no results accomplished, 3 of us went up there determined to fix it. After lots of bypassing this and that, we added a large RF choke on the output cable of the Micor PA. Repeater is GE RX and Exciter, PA is Motorola 100W Micor. The Salsa went away. We added a second for good measure and left. The Digital Modulation was being rectified in the Micor PA and added to our carrier. The choke stopped the common mode RF on the cable from getting into the PA. Our next step is to provide a 1/4 wave shunt on the transmission line where it enters the shack on both antenna cables. Just another head scratcher to add to the Fix list. Steve W4CNG
Re: [Repeater-Builder] RC96 manual
Kevin sent this link and it works. http://www.repeater-builder.com/acc/acc-rc-96-manual.zip 73, Joe, K1ike John Transue wrote: Joe, I get the same message when trying to download the file. I have a hard copy but no electronic copy. Let me know if you want me to copy it for you. John Transue
Re: [Repeater-Builder] Re: LMR600 in Duplex radio?
Here: http://www.repeater-builder.com/antenna/recommended-coax-and-connectors-for-iden.pdf Also look at: http://www.repeater-builder.com/antenna/andrew-braid-over-foil-imd.pdf 73, Joe Ryan Gross wrote: Where can one find this article about the iden work up. Ryan n3ssl Yahoo! Groups Links
[Repeater-Builder] DATARADIO 96+ Manual needed
Guess the ham that said he would send the manual has forgotten about it..hi I need a manual with pinout or specs for the Dataradio 96+ unit. I'm wanting to see if they could be used in a ham radio application. I have not found out anything online that would show me what pinouts and specs. I appreciate it! Thank you 73 Kenny ARS KG5KS Currently DEC B, EC Jackson County, OBS, ORS, ARRL VE Courses completed Nims 700, ICS 100, 200, 300, 400, 702, 317, 394, 240, 242, 139, 245, 275, 230, 235, 800, ARECC 1, Skywarn Certified Continuously, Past Public Safety Officer for State.
[Repeater-Builder] Re: What Have I got and can I get information about it.
Rick Beatty nu7...@... wrote: I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance --Rick The service manual for the SysTel will be posted on R-B soon. The GP300 based Systel CAN be used on GMRS as the radios ARE type certificated for part 95 GMRS. The telephone part would have to be disabled via the provided dip switch. An external power amplifier may not be type certified for GMRS use. The GP300 transmitter in the SysTel can run at 3 watts comfortably. Spend your money on a good antenna instead.
[Repeater-Builder] Re: RC 1000 controller code table
Joe can you send it direct to wb8art at netzero dot com. I use the web base mostly and it does get the attachments. Thanks Randy --- In Repeater-Builder@yahoogroups.com, Joe k1ike_m...@... wrote: Here are the codes from the July 1, 1995 Rev 4.3 manual. 73, Joe, K1ike wb8art wrote: Well its not that old then and a lot of the codes are current with 4.7 rev, but there are a few that do other things, not expected so just trying to get the real data. Randy
[Repeater-Builder] Any lost or missing regulator board orders?
Hi Groovy guys and gals... Remember me? Yeah I've been busy trying complete some large projects. I can once again see the light at the end of the tunnel and hopefully it's not another train. However, I've learned that earlier this year through my not directly paying proper and full attention to and directly dealing with small parts orders that a hopefully very small number (less than 1 or 2 orders total) of folks might not have received their Astron Regulator board packages. I'm contacting a thankfully very small number of persons for whom I'm not able to locate USPS Delivery confirmation slips to confirm receipt of delivery. I have located addressed and fixed that problem, fully take responsibility for that persons actions (or lack there of) and will try to now promptly resolve and best make things right for anyone who reports they've not received their paid order. Please respond to me at my normal skipp025 at yahoo.com Email address if you have not received an order. I'll promptly reply to your email. Thanks a mucho, Good to be back in orbit... now where's that darn Nike Cape gotten off to again? cheers, skipp skipp025 at yahoo.com skipp...@yahoo.com www.radiowrench.com Boy have I got some new stories to share with you folks...
[Repeater-Builder] Micor UHF Receiver
I looked in the files section but didn't see anything about the discriminator circuit. The receiver I'am working on is an unmodified Micor UHF 450-470mhz. I have had the channel element recrystaled by ICM for 455.xxx. After going through the alignment. I tried to adjusted the discriminator to 0 by shorting the AFC circuit as discribed in the manual. I can bring discriminator to zero but after removing the short it drifts up to 1 on the meter. It sounds okay and the receiver sensitivity is within factory specs. I don't understand why the discriminator drifts up after tuning it. Any info on this would be helpful Thanks and Happy holidays to everyone Mike
[Repeater-Builder] Re: Yet Another split antenna Question
I have a 2000' broadcast tower with a platform at 1300' and another at 1000'. There is a DB 224 mounted under the 1300' and one under the 1000' platform with a section of 7/8 feed line running from the top platform and the bottom platform. What I would like to do, is mount the radio in the enclosure at the top platform. Use the top DB 224 for the Receive antenna, and the 1000' DB 224 for the Transmit antenna. What are the problems that I will run into with this situation, and should I look for some type of filter for the receiver. Stray RF will be everywhere and there will probably be a relatively high noise floor at the site. The receivers will tend to block or hose up (not work well) from all the shear amount of RF. For a great system, you will need a decent amount of both the proper type of receiver and transmitter filtering Performance will at first start up probably be less than you might expect or desire... but over time you'll learn how to deal with all the nearby RF. Poorly contained and controlled GasFet Pre-amplifiers will become really good mixers and grunge generators. The hopefully free lunch will probably cost you more than the advertised price. cheers, s.
Re: [Repeater-Builder] Micor UHF Receiver
That's perfectly normal. lance N2HBA - Original Message - From: mike To: Repeater-Builder@yahoogroups.com Sent: Thursday, December 18, 2008 9:19 PM Subject: [Repeater-Builder] Micor UHF Receiver I looked in the files section but didn't see anything about the discriminator circuit. The receiver I'am working on is an unmodified Micor UHF 450-470mhz. I have had the channel element recrystaled by ICM for 455.xxx. After going through the alignment. I tried to adjusted the discriminator to 0 by shorting the AFC circuit as discribed in the manual. I can bring discriminator to zero but after removing the short it drifts up to 1 on the meter. It sounds okay and the receiver sensitivity is within factory specs. I don't understand why the discriminator drifts up after tuning it. Any info on this would be helpful Thanks and Happy holidays to everyone Mike -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.9.19/1855 - Release Date: 12/18/2008 10:16 AM
RE: [Repeater-Builder] Yet Another split antenna Question
We were at 1400 ft and 1100 ft for a while with the repeater on the tower running 40 watts TX. That separation was OK for the Tx and Rx isolation. We ran one can on the RX. an HT could be full quieting at 50 miles from the repeater. The repeater was a Mstr II inside a surplus traffic light controller box. Unfortunately we lost access to the elevator and so we brought the repeater to the bottom of the tower because of the climbing costs. Takes a lot more watts and a good preamp and still doesn't equal the range performance but it is a lot easier to work on especially in cold weather. With the repeater in the air, everything needs to be super rugged with as much redundancy as you can manage and as modular for swapping parts in and out as possible. It is absolutely no fun to try and work on anything at that height in the winter. John Lock kf0m at arrl.net -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com]on Behalf Of kb5vjy Sent: Wednesday, December 17, 2008 11:05 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Yet Another split antenna Question Folks, I have read just about every split antenna post that I can find.. I hate to be a yet another poster but here is my situation. I just want to know if it is do able. And what problems I might run into. After months of waiting, I have been issued a repeater pair of 147.255 for a long range 2m repeater that will be installed. This is my first 2m repeater, but I do have 3 70cm repeaters (all Mastr II's).. My situation is the following: I have a Mastr II Station 100w Cont. Duty PA for the project... I still have to order the xtals. I will run a PL as needed on 127.3. The controller will be a CAT (version unsure of) I have a 2000' broadcast tower with a platform at 1300' and another at 1000'. There is a DB 224 mounted under the 1300' and one under the 1000' platform with a section of 7/8 feedline running from the top platform and the bottom platform. There is a full rack size NEMA 12 enclosure on the 1300' platform. After Feb '09 there will be NO VHF transmitting equipment on this tower at all. The closest transmitter is 6 miles away. What I would like to do, is mount the radio in the enclosure at the top platform. Use the top DB 224 for the Receive antenna, and the 1000' DB 224 for the Transmit antenna. What are the problems that I will run into with this situation, and should I look for some type of filter for the receiver. I do plan on putting an APRS Digi at 1300' as well moving one of my 70cm repeaters to the same platform some time early next year. Any comments would be helpful. Thanks.. 73 de Joe KB5VJY Sorry.. RTTY dayz! Yahoo! Groups Links
Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC
Tom, You say you find similar operation on 4 or 5 units. By that do you mean they won't make book specification on any frequency below 146 MHz? If that is the case, I would believe something is wrong. I have seen many Mitrek high-band receivers that were tuned for 144 something and had very good sensitivity. Let me ask you this When tuned at 144.89, is the front-end tuning all one ended, or is there adjustment to spare? In other words, can you tune the front-end without the fear of the tuning screws falling into the casting? If you have room left to go lower in frequency, then the front-end is not the problem, and you'll need to look elsewhere for the lack of sensitivity. Another question - do these 4 or 5 units tune and make book spec sensitivity on their original high-band channel? I guess what I'm saying is I doubt the problem is the front-end helical resonators, but if there is a need for a conversion I'm not opposed to looking into making a modification available, if it is needed. If there are others on the list that have had good luck with the Mitrek on frequencies below 146 MHz, please chime in and let us know what you have and how well it works. Kevin Hello Kevin You are correct on your freqs for xmit and rcv. The Mitrek units I have will only tune receive to 146.00Mhz. This leaves more than one meg to go to meet tolerance on 144.890. I have tried 4 or 5 units and find similar operation of all. This is the reason for my question about the Micor coils working for Mitrek. Thanks. 73 de Tom Manning, AF4UG - Original Message - *From:* Kevin Custer mailto:kug...@kuggie.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Tuesday, December 16, 2008 8:44 PM *Subject:* Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom, Do you mean 144.89 MHz? I would think your repeater would *transmit* on 145.490 MHz At any rate, no conversion is necessary for the Mitrek to make book specification sensitivity on 144.890 MHz. Kevin Good afternoon Kevin My need is to convert two or more Mitrek receivers to cover 145.49Mhzz, which is our receive freq for our repeater. Thanks. 73 de Tom Manning, AF4UG - Original Message - *From:* Kevin Custer mailto:kug...@kuggie.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Tuesday, December 16, 2008 12:19 PM *Subject:* Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom Manning wrote: Good morning Kevin I have a question. Will these coils also work in a Mitrek? Thanks. 73 de Tom Manning, AF4UG Hi Tom, To answer your question, the conversion will not work in the Mitrek. Unlike the MICOR, the Mitrek high-band unit that is most common has a lower tuning limit of 146.00 MHz as specified from the factory. This means that the units normally tune anywhere in the 2M ham band without modification. What frequency do you need to listen on? Kevin
