Re: [Repeater-Builder] back-up battery charging
>There is a simple way to have a reliable backup battery system without a >relay. Try this: > >Connect your fused repeater power cable directly to the battery terminals, >without any intervening devices. Connect your power supply to the battery >through a single Schottky diode. Adjust the power supply voltage so that the >battery is floated at its optimum voltage, to account for the small forward >voltage drop across the Schottky diode. I use a Schottky diode because its >forward voltage drop under load is much smaller than that of a silicon diode >and is stable. > This is the way I have operated several repeaters for over 5 years. The only difference is the charger for the battery. I use a standard transformer rectifier charger, with no filtering. The battery provides all the filter required. The main advantage in using the battery charger is that when the battery goes completely down, it will not destroy the power supply trying to recharge the dead battery. The battery charger is designed for this type service and will bring a dead battery back up to voltage without a charger failure. The diodes in the charger serve to disconnect the charger from the battery load when the 115 VAC is not present, so no external diode is necessary. As Eric points out above, connect the charger and load directly to the battery terminals. I actually connect the load to the wing nut terminals and the charger to the battery posts to keep the impedance between the charger and the load to a minimum and have no common path for load and charger except for the battery itself. >Unless the repeater operates almost continuously, the power supply does not >need to match the current draw of the radio during transmit. I have a 50 watt >base station set up this way that has a 26 Ah VRSLA battery floated by an >Astron RS-10 power supply, and it has been 100% reliable through many power >outages. > I use a charger rated at 10 amps for a load that peaks at 20 amps. The battery supplies the excess current when the repeater is key down and is recharged when the repeater is key up. The filtering effect of the battery keeps the DC with minumum ripple even under load. The Schulembarger (SP?) transformer/diode chargers I use do not provide the 13.5 VDC float voltage I want with a standard setting on the charger. The 2 amp setting provides too low a voltage and the 10 amp setting provides too high a voltage. With 115 VAC on the primary I put the 6 volt secondary of a 115:6 volt transformer in series with the input voltage to the charger to either add or buck the voltage to the charger. I can set the battery voltage to precisely 13.5 VDC with the proper combination of add/buck. With no other electronics in the charger besides the diodes, there is a minimum possibility of a problem in the power system, and absolutely no possibility of an overvoltage to the equipment should there be a failure. I take the buck transformer out of the circuit every few months to 'stir' the electrolite in the battery to reduce the sulfation of the plates. I use a stardard type 27 deep cycle battery from Wall Mart for the backup and have had excellent service for over 5 years in the several repeaters using this scheme. 73 - Jim - W5ZIT Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Well,what I came up with is since the Micor supplies arent adjustable,was two silicon diodes in the charging circuit. Drops it to 13.5v then added a contactor,normally closed,with a 125vac coil to connect direct to the batteries during an outage. I will post the results once implemented. 73,Lee Eric Lemmon wrote: > There is a simple way to have a reliable backup battery system without a > relay. Try this: > > Connect your fused repeater power cable directly to the battery terminals, > without any intervening devices. Connect your power supply to the battery > through a single Schottky diode. Adjust the power supply voltage so that the > battery is floated at its optimum voltage, to account for the small forward > voltage drop across the Schottky diode. I use a Schottky diode because its > forward voltage drop under load is much smaller than that of a silicon diode > and is stable. > > The diode is needed because some power supplies have a tendency to go into a > "crowbar shutdown" mode if the AC input goes away (as during a power failure) > while a DC voltage is maintained at its output by a battery. Such an event > will blow fuses and will almost certainly shut down the repeater. > > Unless the repeater operates almost continuously, the power supply does not > need to match the current draw of the radio during transmit. I have a 50 > watt base station set up this way that has a 26 Ah VRSLA battery floated by > an Astron RS-10 power supply, and it has been 100% reliable through many > power outages. > > I used an International Rectifier #122NQ030R diode, simply because it was > easy to mount on a copper bar that is bolted to the positive terminal of the > power supply. The "R" in the part number indicates reverse polarity, meaning > that the diode terminal screw is the cathode, which is convenient for > attaching the load wire. Here's the datasheet: > http://www.irf.com/product-info/datasheets/data/122nq030.pdf > > 73, Eric Lemmon WB6FLY > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] back-up battery charging
There is a simple way to have a reliable backup battery system without a relay. Try this: Connect your fused repeater power cable directly to the battery terminals, without any intervening devices. Connect your power supply to the battery through a single Schottky diode. Adjust the power supply voltage so that the battery is floated at its optimum voltage, to account for the small forward voltage drop across the Schottky diode. I use a Schottky diode because its forward voltage drop under load is much smaller than that of a silicon diode and is stable. The diode is needed because some power supplies have a tendency to go into a "crowbar shutdown" mode if the AC input goes away (as during a power failure) while a DC voltage is maintained at its output by a battery. Such an event will blow fuses and will almost certainly shut down the repeater. Unless the repeater operates almost continuously, the power supply does not need to match the current draw of the radio during transmit. I have a 50 watt base station set up this way that has a 26 Ah VRSLA battery floated by an Astron RS-10 power supply, and it has been 100% reliable through many power outages. I used an International Rectifier #122NQ030R diode, simply because it was easy to mount on a copper bar that is bolted to the positive terminal of the power supply. The "R" in the part number indicates reverse polarity, meaning that the diode terminal screw is the cathode, which is convenient for attaching the load wire. Here's the datasheet: http://www.irf.com/product-info/datasheets/data/122nq030.pdf 73, Eric Lemmon WB6FLY At 09:18 PM 04/18/06, you wrote: >Captainlance <[EMAIL PROTECTED]> wrote: > >What would be the next best charger, if one >doesn’t have a Micor Power Supply with the >battery charger or our Micor Power Supplies don’t have the battery charger ? > >73’s, >JimKh6jkg Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
They claim 40 amps. I have one but have only drawn about 20 amps thru it. No problems.. [EMAIL PROTECTED] wrote: Is it capable of carrying 30 amperes or so? Neil - WA6KLA Original Message From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] back-up battery charging Date: Tue, 18 Apr 2006 01:11:01 EDT Also look at west mountain the rigblaster people. They have a nice charge controller that will switch over to back up batteries if you loose power to your 13.8 v supply. I have used one at my base station for six months. It works great with wet or gell cells. KB1CHU Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] back-up battery charging
At 09:18 PM 04/18/06, you wrote: >Captainlance <[EMAIL PROTECTED]> wrote: > >What would be the next best charger, if one >doesnât have a Micor Power Supply with the >battery charger or our Micor Power Supplies donât have the battery charger ? > >73âs, >JimKh6jkg. Find a real battery charger like was used at a Telco central office and use it - it was made for the job, and made to survive with next to no maintenance for years. And have a contactor that is driven by failure of the AC mains to switch the repeater from the output of the Micor supply over to the battery bank. Mike WA6ILQ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Captainlance <[EMAIL PROTECTED]> wrote: >Yes, the battery charge units have a big cast aluminum heat sink on the >chassis. >- Original Message - >From: "Lee Williams" <[EMAIL PROTECTED]> >To: >Sent: Tuesday, April 18, 2006 5:05 PM >Subject: Re: [Repeater-Builder] back-up battery charging > > >>I will have to check the p/n,but dont think they have the battery >> option. Is there any obvious difference in the appearance of the battery >> specific units? I will also look for the pot to turn these babys down, >> getting tired of cooking batteriesthanks to all,73,Lee >> >> [EMAIL PROTECTED] wrote: >>> If the Micor Power Supplies are either TPN1105A or TPN1106A yes, >>> the outputs are adjustable - >>> >>> If not those model numbers, no, they can't be adjusted for >>> specific battery charging. >>> >>> BTW, there are seven specific Micor Power Supplies by model number. >>> >>> The two mentioned above, TPN1151A, TPN1152A, TPN1110A, TPN1110B >>> and the 12 VDC only version (I don't have the model number handy.) >>> >>> Hope this helps, >>> Neil - WA6KLA What would be the next best charger, if one doesn’t have a Micor Power Supply with the battery charger or our Micor Power Supplies don’t have the battery charger ? 73’s, JimKh6jkg. __ Switch to Netscape Internet Service. As low as $9.95 a month -- Sign up today at http://isp.netscape.com/register Netscape. Just the Net You Need. New! Netscape Toolbar for Internet Explorer Search from anywhere on the Web and block those annoying pop-ups. Download now at http://channels.netscape.com/ns/search/install.jsp Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Yes, the battery charge units have a big cast aluminum heat sink on the chassis. - Original Message - From: "Lee Williams" <[EMAIL PROTECTED]> To: Sent: Tuesday, April 18, 2006 5:05 PM Subject: Re: [Repeater-Builder] back-up battery charging >I will have to check the p/n,but dont think they have the battery > option. Is there any obvious difference in the appearance of the battery > specific units? I will also look for the pot to turn these babys down, > getting tired of cooking batteriesthanks to all,73,Lee > > [EMAIL PROTECTED] wrote: >> If the Micor Power Supplies are either TPN1105A or TPN1106A yes, >> the outputs are adjustable - >> >> If not those model numbers, no, they can't be adjusted for >> specific battery charging. >> >> BTW, there are seven specific Micor Power Supplies by model number. >> >> The two mentioned above, TPN1151A, TPN1152A, TPN1110A, TPN1110B >> and the 12 VDC only version (I don't have the model number handy.) >> >> Hope this helps, >> >> Neil - WA6KLA >> >> >> >> >> >> > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
I will have to check the p/n,but dont think they have the battery option. Is there any obvious difference in the appearance of the battery specific units? I will also look for the pot to turn these babys down, getting tired of cooking batteriesthanks to all,73,Lee [EMAIL PROTECTED] wrote: > If the Micor Power Supplies are either TPN1105A or TPN1106A yes, > the outputs are adjustable - > > If not those model numbers, no, they can't be adjusted for > specific battery charging. > > BTW, there are seven specific Micor Power Supplies by model number. > > The two mentioned above, TPN1151A, TPN1152A, TPN1110A, TPN1110B > and the 12 VDC only version (I don't have the model number handy.) > > Hope this helps, > > Neil - WA6KLA > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
here are the specs from the website Specifications Maximum Voltage: 18 Volts DC Maximum Current: 40 Amperes Circuit: Diode OR-Gate Diodes: Two Schottky 80 Ampere, 20 Volt Voltage Drop: 0.25 Vdc at 1 Ampere0.5 Vdc at 40 Ampere Charging Circuit: Charging regulator ICField Effect Pass TransistorSchottky DiodeFuse switched for 1,4,7 or 10 Amperes (±5%) maximumPeak voltage limit: 13.8 (Gelled), 14.2 (AGM),(±2%)Peak voltage limit set via internal jumper to GELLED or AGMPeak voltage terminate point: 0.1 Maximum currentFloat Voltage: 13.5 volts (±2%) LEDs: Green - Indicates charger is "ON"Red - Indicates peak "PK" charge voltageYellow - Indicates Float "FL" voltage Connectors: Anderson Powerpoles, 40A Size: 5.25 x 3.90 x 1.65 in, 13.4 x 9.9 x 4.2 cm Weight: 0.9 lbs, 0.4 kg Mounting Holes:: Two, 0.175 in. d, at a distance 4.875 in., for #8 hardware YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] back-up battery charging
Lee, Later in this thread the WestMountain charge controller is referenced... but.. I wanted to address your question directly. I have been using a Xantrex C-35 solar charge controller (smart 4 level charge controller) And 2 pair of big-honkin' diodes to accomplish the same thing. The diodes were directional control of current, and the charge is routed through the Xantrex. While the repeater supply by-passed the Xantrex.. (does that make sense to anyone?) Both sides of the house are one-way only through implementation of the big diodes... As I mentioned before.. this was "cooked-up" prior to the WestMountain controller. I glanced at their product, and still need to research it a bit further.. but for the price it is much cheaper than my Xantrex C-35 "cluge". And quite elegant as well.. maybe I will be able to reclaim my solar controller for little expenditure :-) Just my 2 cents worth.. 73 Mike Perryman www.k5jmp.us -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Lee Williams Sent: Monday, April 17, 2006 10:52 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] back-up battery charging I am now in charge of some club repeater sites which use the standard Micor power supply. These have back-up batteries on them which are being boiled dry by the 14.9V the power supply delivers,these supplies are not the battery back-up versions. I am looking for a good solution to solve this problem,maybe someone else has been there,done that??? Are there adjustments to set the voltage on these beasts? I thought about a relay,some big diodes,but it looks ugly... 73,Lee Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Good description Lance ... and R1091 is correct. Neil - WA6KLA Original Message From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] back-up battery charging Date: Tue, 18 Apr 2006 10:36:54 -0400 >Hello, >I have several of these Micor repeaters with the TPN1105/6 battery >charger >supplies running and have the solution to your problem. First, the >factory >set the charge voltage at 14.25 volts since as standard equipment >they >supplied NICAD batteries for backup. Naturally, this is way to high >for >lead/acid. SO, all you need to do is open up the large steel plate on > the >backside of the power supply and locate the Voltage adjust pot on the >large >PC board, I thik it is R1091... then, without any batteries on line, >adjust >to 13.2 volts. from the 14.25. Hook your batteries back up and you >are good >to go!. The slide switch on the PS should be left in "FLOAT" >position, if >switched to "EQUALIZE" it will add +1 Volt making 14.2, this is to >allow >for quicker recharge after a battery power event, and should be reset >after >24 hours to float. >Hope this all helps you. >Lance N2HBA >- Original Message ----- >From: <[EMAIL PROTECTED]> >To: >Sent: Tuesday, April 18, 2006 10:16 AM >Subject: RE: [Repeater-Builder] back-up battery charging > > >> >> If the Micor Power Supplies are either TPN1105A or TPN1106A yes, >> the outputs are adjustable - >> >> If not those model numbers, no, they can't be adjusted for >> specific battery charging. >> >> BTW, there are seven specific Micor Power Supplies by model >number. >> >> The two mentioned above, TPN1151A, TPN1152A, TPN1110A, TPN1110B >> and the 12 VDC only version (I don't have the model number handy.) >> >> Hope this helps, >> >> Neil - WA6KLA >> >> >> >> Original Message >> From: [EMAIL PROTECTED] >> To: Repeater-Builder@yahoogroups.com >> Subject: RE: [Repeater-Builder] back-up battery charging >> Date: Mon, 17 Apr 2006 22:51:56 -0400 >> >>>I am now in charge of some club repeater sites which use the >>>standard Micor power supply. These have back-up batteries on them >> which are >>>being >>>boiled dry by the 14.9V the power supply delivers,these supplies >are >>>not >>>the battery back-up versions. I am looking for a good solution to >>>solve >>>this problem,maybe someone else has been there,done that??? Are >there >>> >>>adjustments to set the voltage on these beasts? I thought about a >>>relay,some big diodes,but it looks ugly... 73,Lee >>> >>> >>> >> >> >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> >> > > > > > > > >Yahoo! Groups Links > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Is it capable of carrying 30 amperes or so? Neil - WA6KLA Original Message From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] back-up battery charging Date: Tue, 18 Apr 2006 01:11:01 EDT >Also look at west mountain the rigblaster people. They have a nice >charge >controller that will switch over to back up batteries if you loose >power to your > 13.8 v supply. I have used one at my base station for six months. It > works >great with wet or gell cells. KB1CHU Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Hello, I have several of these Micor repeaters with the TPN1105/6 battery charger supplies running and have the solution to your problem. First, the factory set the charge voltage at 14.25 volts since as standard equipment they supplied NICAD batteries for backup. Naturally, this is way to high for lead/acid. SO, all you need to do is open up the large steel plate on the backside of the power supply and locate the Voltage adjust pot on the large PC board, I thik it is R1091... then, without any batteries on line, adjust to 13.2 volts. from the 14.25. Hook your batteries back up and you are good to go!. The slide switch on the PS should be left in "FLOAT" position, if switched to "EQUALIZE" it will add +1 Volt making 14.2, this is to allow for quicker recharge after a battery power event, and should be reset after 24 hours to float. Hope this all helps you. Lance N2HBA - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Tuesday, April 18, 2006 10:16 AM Subject: RE: [Repeater-Builder] back-up battery charging > > If the Micor Power Supplies are either TPN1105A or TPN1106A yes, > the outputs are adjustable - > > If not those model numbers, no, they can't be adjusted for > specific battery charging. > > BTW, there are seven specific Micor Power Supplies by model number. > > The two mentioned above, TPN1151A, TPN1152A, TPN1110A, TPN1110B > and the 12 VDC only version (I don't have the model number handy.) > > Hope this helps, > > Neil - WA6KLA > > > > Original Message ---- > From: [EMAIL PROTECTED] > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] back-up battery charging > Date: Mon, 17 Apr 2006 22:51:56 -0400 > >>I am now in charge of some club repeater sites which use the >>standard Micor power supply. These have back-up batteries on them > which are >>being >>boiled dry by the 14.9V the power supply delivers,these supplies are >>not >>the battery back-up versions. I am looking for a good solution to >>solve >>this problem,maybe someone else has been there,done that??? Are there >> >>adjustments to set the voltage on these beasts? I thought about a >>relay,some big diodes,but it looks ugly... 73,Lee >> >> >> > > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] back-up battery charging
If the Micor Power Supplies are either TPN1105A or TPN1106A yes, the outputs are adjustable - If not those model numbers, no, they can't be adjusted for specific battery charging. BTW, there are seven specific Micor Power Supplies by model number. The two mentioned above, TPN1151A, TPN1152A, TPN1110A, TPN1110B and the 12 VDC only version (I don't have the model number handy.) Hope this helps, Neil - WA6KLA Original Message From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] back-up battery charging Date: Mon, 17 Apr 2006 22:51:56 -0400 >I am now in charge of some club repeater sites which use the >standard Micor power supply. These have back-up batteries on them which are >being >boiled dry by the 14.9V the power supply delivers,these supplies are >not >the battery back-up versions. I am looking for a good solution to >solve >this problem,maybe someone else has been there,done that??? Are there > >adjustments to set the voltage on these beasts? I thought about a >relay,some big diodes,but it looks ugly... 73,Lee > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] back-up battery charging
Also look at west mountain the rigblaster people. They have a nice charge controller that will switch over to back up batteries if you loose power to your 13.8 v supply. I have used one at my base station for six months. It works great with wet or gell cells. KB1CHU YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] back-up battery charging
Do not use off the shelf battery chargers, commonly found at Wal-Mart. These are SMPS conviently located with a 600kHz operating frequency. Try an LM-317 set as a constant current regulator to trickle the battery with C/100, Say 1 Amp for a typical Deep Cycle marine battery. A common wall wart should be able to be modified for this purpose nicely. Then I would use a 120V coil relay with 20A contact to switch to the battery on AC loss, and a big 68,000uF Cap on the line going off to the repeater to sustain DC during relay switch time. On 4/17/06, Lee Williams <[EMAIL PROTECTED]> wrote: > I am now in charge of some club repeater sites which use the standard > Micor power supply. These have back-up batteries on them which are being > boiled dry by the 14.9V the power supply delivers,these supplies are not > the battery back-up versions. I am looking for a good solution to solve > this problem,maybe someone else has been there,done that??? Are there > adjustments to set the voltage on these beasts? I thought about a > relay,some big diodes,but it looks ugly... 73,Lee > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
