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Re: Power for UHF repeater
Dave Karr
A linear regulator really isn't the best idea here since power conservation
is a factor. As shown about 50% of the power would be dissipated as heat. A switching regulator should be able to achieve >85% effieciency fairly easily. Of additional interest, there was something in EDN within the last month or so related to maximizing the output of solar panels to charge batteries, can't remember if it was presented as an article or as an application example from Maxim or Linear Tech. One concept presented was taking the output from a single panel and stepping it up to charge a higher battery voltage. I'll dig it up if anyone is interested. * REPLY SEPARATOR * On 3/14/99, at 11:37 PM, Daniel Byrd wrote: If you go with a 24 volt system, no need to bye the 24 to 12 reg for--Dave |
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Re: Power for UHF repeater
kp4pknet
Hi.....
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My name is Max and my call is KP4PK. I run a 144, 222, and 440 mhz machines on solar and wind power. I use 6, 60 watt solar panels and a 300 watt wind mill all at 24V. That feeds (8) 6v 220 amp golf cart batteries. I use a 24V to 13.8V converter to power the repeaters and packet nodes. The system runs basically with out much supervision other than going to the site every 6 to 8 weeks to check the batteries connections for corrosion and cleaning the solar panels. This is not a cheap system. Figure abt $425.00 for each solar panel. abt $650.00 for the windmill, abt $90.00 per battery, add another $125.00 for the charge controller and another $100.00 for the voltage down converter. I bought all the hardware ( but the batteries, which i bought locally) from Sunelco 1-800-338-6844 and Atlantic Solar Products at 1-410-686-2500. They can provide you with catalogs and more information. I hope this helps, 73, Max KP4PK Steaven D. Rogers, KU4VR wrote: From: "Steaven D. Rogers, KU4VR" <ku4vr@...> |
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Small Duplexers
The Lacko's
We have used the small Cellwave duplexers in numerous commercial repeaters.
A few things to remember ; 1.) They will not provide enough isolation in higher power situations. 2.) I believe you need at least 5Mhz separation for the compact units. 3.) Most likely you will not be able to put a pre-amp on the rx'r. (depending on your coverage requirements) If i had a choice i would use a large duplexer. It will provide the best isolation ( for a pre-amp) and the ability to feed higher power thru it. Some of our 100W repeater clean up at .10uV ( Great for rural portable coverage). As long as the specifications meet your needs the compact duplexers work great. My two cents worth, Scott |
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Power for UHF repeater
Steaven D. Rogers, KU4VR
I have located a site for my UFH repeater. However, this site does not
have any power that is available to me. Any ideas on how to run my machine? I have been looking at battery, but I don't think it will run to long unless I have quite a few batteries. The entire system will fraw no more that 5 amps. This site is not out of the way for me to go up every few days and change out a couple of batteries. I just don't think they will last that long. Steaven, KU4VR |
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(No subject)
Bernie Peabody
I use the Cellwave mobile duplexers on atleast 4 out 5 of my 440
repeaters and have excellent luck with them. Of course it limits you to no more that 50 watts, but with my system I have not found a need for high power. These duplexers also fit very nicely in the Kenwood TKR-820 repeaters. Bernie (N1IMO) N1IMO/N1IMN Repeater System PO Box 991 Hollis, NH 03049-0991 29.64 /53.93/145.31/146.73/147.195/224.50/442.15/443.50 446.175/449.375 MHz CTCSS: 88.5 www.qsl.net/n1imo |
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Model Numbers
Hi...
I have a couple of questions. 1.) Saw these models in a FOR SALE flyer: RG** EXEC RT** EXEC II EC** MASTR II EX** MASTR II F3** MONOGRAM What do these prefixes signify? AC base? Repeater? Or special mobile products? 2. What models are crystal control (non-programmable)? Monogram, Century II, MVS, Custom MVP, MLS, Delta, Delta SX, Etc... I'm a new GE fan just starting out. Thanks for the help! Jim Z N9JZ ........................................................ Listen to WBAL Radio Live on the Net and Get FREE EMAIL - at |
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Re: acc-96 system sold
Cristobal Inos
jim maike wrote:
Hi: Do you have anything for sale...repeaters/ etc. chris inos wh6um |
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Re: acc-96 system sold
jim maike
Cristobal Inos wrote:
not write now thanks jim |
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My Repeater Project
"\"BT\" a.k.a kc0edo"
Greetings to all other fledgling repeater builders, those of you that have been successful keep me and will hopefully answer my questions and I will hopefully be able to help others... I'll run down the hardware I've amassed and maybe someone(s) out there can run it through their gray matter and see what you come up with.
(3) Micor UHF Mobile 45w units Micro Controller Concepts 1000V voice unit, built in ct64 ctcss, rack case TE Systems UHF AMP 25Win-175+ out, GasFET Preamp, Radio Shaft's wunnferful Discone - an airborne crummy load for whenever I need to hook something up to an antenna on chimney straps on 10' Mast about 50ft up. Comet GP-15 Tribander on 25ft of Mast - I get extraordinary signal reports and great DX on 2M and 440. Planning on using it for the repeater unless something better comes along. Both antennas are on 90ft of International Wire and Cable 9086 and a #4 ground into 8ft ground rod. Extra run of LMR Ultra, a run of Cat5, and RG58, with the two antenna runs are bundled down the side of the house. I put in a 3" PVC wire chase pipe through the outside wall to the inside basement shack so that this all runs in and I can always put more cables through for testing and expansion plans that I know I'll do. (3) 1KW UPS units (2) Icom W32a HT's, drop in charger, 6 batteries, Computer Interface, built-in extended recieve and full crossband repeat (Email for info, web page in progress), antennas, all the goodies, I got one for me, thinking it was the coolest piece of handheld radio I'd seen, well a family member got his ticket, I got one for him as a trade-up gift/reward and I got stiffed (read: forsale or trade possibile) (2) Icom IC-2710 Dual Band extended everything with Tone and DTMF decoders for full crossband repeat with remote control, neat neat radios, get some intermod in the big city - the following 2 items seem to take care of that. 2M homebrew 2 stage helical resonator given me from another club member retuned to peak output at 146Mhz. DCI 146-4H 2 Meter BandPass Mod Box. A 6 can set of 406-512Mhz duplexer(s). 125ft of 7/8'ths hardline Well, I want to use the Micor's for the repeater. How hard is it to re-tune these things? I have a friend that will be doing a lot of the work on these as I am recovering from a 14 level spinal fusion. I have been told that these units will function just fine as a stand alone repeater. My Friend is PUSHING me to getting a Hamtronics Exciter (dip switch settable is nice, but it's not his money being spent, it's mine) and then use the PA stage of the Micor. With 3 of these units what I was envisioning was 2 of them ready to rock and roll as stand alone units, one online, the other ready to go spare, and the third used as a remote base radio, or perhaps a link to another site. As it stands I could see tuning them both up but then using the receive section of one to the transmit of the other. But as I've said, I know that these micors have been used to support the links for the SUPERLINK - From Wisconsin to Montana without problems or we couldn't yack from MadCity to no-where North Dakota. (no offense). I bought the controller to eventually get a machine up. It was my Xmas present from $$ from them and money that I had made selling off one of my Macintosh computers. I originally wanted to get my hands on, for example, a pair of HTX202's (Have 1 202, if someone can kinko's me a service manual so I can get the COS line outside to put into the controller, HT body and antenna, no battery holder or nicad) and a pair of 404's and add a connector to the HTs (or mobiles, or whatever) and program up the controller, use some of the additional logic lines to interface the controller to a computer so I could put in time and temp and stuff like that dumped in from the computer into the voice ID in the controller so when I went on the air I would have an unique machine, not another blip and beep box. Well, this has taken me some number of hours to type and think it all through, you can reply to the reflector to bounce ideas around, as me getting the controller was supposed to start as an intellectual exercize to begin with, I'd like to see what the other 'experts' ideas and opinions/options are out there. Please also Email me directly, mailto:audiohead@... Bryant "BT" Thompson 2069 Viburnum Trail Eagan MN 55122-2354 kc0edo@... for reflected stuff like joke mailing lists 612-526-1296 24hr's numeric pager/45sec voicemail |
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Re: master-pro uhf radio mod.
Richard D. Reese
Mike DeWaele wrote:
From: "Mike DeWaele" <mdewaele@...>Mike, Double check your tuning. The MASTR PRO receiver should tune up with any modifications necessary if it was originally 450 to 470 MHz. What reading is abnormal? I have used many of them in the Ham Band over the years and still have some in service. -- Richard D. Reese WA8DBW 224.320, 444.200, 920.000, 2411.200 MHz Voice 330-335-0122 |
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Re: Controllers
Cristobal Inos
Cristobal Inos wrote:
If you like orange and blue, then you will love our new web site! This list is sponsored by the owners and users of "RBTIP" Hi to all:1. wHAT IS THE WORKING FREQUENCY..CHECKED? TUNED? ALIGNED? Have been in two-way radio business for 5 years providing communication to government agencies between the 15 island chain in the Mariana Islands (Guam, Rota, Tinian..atomic bomb that compelled Japan to surrender, Saipan, etc....15 islands). I currently have a combination of Commercial repeaters 8 in all....All Ge Master II with TP-154 controllers that can take up to 53 users (community). The point is....if you is looking for good controllers go to Connect Systems TP-154 don't have the address/email handy...can be found in Mobile Technology Mag. User Friendly,...add customers...take off those that don't pay...all by DTMF ....mY REPEATERS are all located at the mountaintop...impassible by car had to hike app. 1-2 miles to reach...DTMF IS THE WAY TO GO. thanks Chris Inos wh6um if need additional help: email: soni@... tel: (670) 235-4667 |
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Re: Controllers
Cristobal Inos
William F. martin wrote:
1. wHAT IS THE WORKING FREQUENCY..CHECKED? TUNED? ALIGNED? 2. SINGLE USER OR COMMUNITY USER? 3. AGE CHRIS INOS WH6UM |
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Re: master-pro uhf radio mod.
Ralph Hogan
Mike,
I've tuned the UHF master pro down to 442.2 rx when we used to run them as mobiles (many moons ago). No modifications are required for either the TX or RX to use on the ham bands in my experiences. In this area the repeaters are high in, low out. I've got one operational as a repeater on 449.3 rx / 444.3 tx and no problems tuning it there either. Perhaps you could elaborate on whats happening while tuning the rx. For using it as a repeater, you'll need the deskmate AC base station supply. I've seen the supplies for under $40 from surplus vendors on the web. (see www.qsl.net/wb4tur for a look at the AC supply) The mobile DC-DC will not handle the repeater duty cycle demands. I've had friends in the past that tried and burned them up. The modular mobile tx/rx strips can easily be removed from the mobile H frame chassis and installed into the base station power supply in less than 30 minutes. An RC1000 or NHRC-2 would be a good starting controller to use with it. The AC supply brings all of the signals out to a few barrier terminal strips for easy wiring access. It will make a great reliable 60 watt repeater if you dont mind the 8072 final tube in the TX PA. These tubes are expensive new, but an entire spare mobile is cheap enough. The receiver is all solid state and will run on just +12 VDC (and 10.8 VDC). Of course if you have a Moto Micor or GE Master II, these would be easier to use since no High voltage tube supplies are required. You have to weigh the cost of the Master Pro AC supply versus a high current 12 VDC supply. Ralph WB4TUR |
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master-pro uhf radio mod.
Mike DeWaele
hi all,
I been playing around with a master pro uhf radio to convert to repeater in the ham band. my repeater freq split is 444.075 rec and 449.075 tx. I was able to tune up tx ok. I think the rec freq is out of range for radio as it is. I was wondering if any one has info on changes to get it down to work in that freq. I'm also looking to duplex it for repeater opertion if any one has any info on that .. Thanks. Mike Ka2ndw |
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