support local ventures

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Check out this local Greene County related Podcast-- you will like it.

www.mygreeneradio.com

 

Public Service EVENTS

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XWARN, like many amateur radio clubs are always happy to assist with public service events such as runner and bicycle marathons, horseback  riding events, parades, etc.

We provide  multipoint communications for the safety and well being of participants in these events. With our radio systems we are able to place observer/communicator volunteers along various points of your events route.

We are not a policing agency.

We do NOT control traffic and

We are NOT Medical personnel.

We are simply communicators.

We relay information to your control point for your event.

If your organization is planning an event and you would like to have Amateur Radio Communication Support, or you would like to know how we can help your events,
contact Mike Crawford KC8GLE at This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 XWARN does not claim any ownership, responsibility, nor sponsorship  to any of these events. We simply provide short and medium range communications support to these events, at no charge to the organizations for the well being of the participants.

 

Contact XWARN

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Feel Free to email any one of us on this list with any questions you may have,
or email the group of us at This email address is being protected from spambots. You need JavaScript enabled to view it.

XWARN P.O.Box 562
Xenia, Ohio 45385

Club Officers
President - Bob Baker N8ADO
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Vice President - Bret Boggs NV8I
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Secretary - Phyllis Haller KC8QCK
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Treasurer - Steve Mackey N8ILR
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Committee Chairpersons

Membership - Ken Cornett N8SPW
 You can email Ken for membership information,
or apply online at This link
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Public Service - Mike Crawford KC8GLE
Email mike if you would like XWARN to assist with communications
at your next outdoor event
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Communications Support Trailer Team (CST) - Mike Crawford KC8GLE
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Technical - Jim Simpson WB8QZZ
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Wavelengths Newsletter - Jeff Devoe K8JTD
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Webpresence Administration - John Seitz N8ACU
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Area Ham Clubs

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work in progress. below is a list of southwest Ohio Ham Radio clubs and related information. If your club is not listed here or the information is not accurate, please email the admin of this website ( ME) ASAP so that I can make sure this info is current.- de N8ACU
NOTE- Links to the listed clubs will only be entered here IF the site is current and actively maintained.

 

Hyper REACH What is it?

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The Greene County Emergency Management has instituted the Hyper-Reach Emergency Notification System - an ultra high-speed telephone communication service for emergency notifications. This system allows Greene County Officials  to telephone all or targeted areas of the county and notify residents with emergency information in the event of emergency situations or critical community alerts.

IF you have a landline telephone and reside in a Greene County Community, you are already registered for this system.

IF you only have Cell phones, or wish to add your cell phone(s) to the notification list you can sign up at this link > 

 Hyper-REACH Sign-up

NOTE – this link is for Greene County Residents Only.

Parallelling VRLA Batteries

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Lead-Acid Batteries

 Lead-acid batteries are one of the most cost effective ways to store electrical energy, provided that they are used in a controlled temperature environment and the weight is not an issue.  The really bad part is that they contain hazardous materials: lead, which is a health hazard, and dilute sulfuric acid, which is corrosive and can cause eye injury.  During charging, they can give off hydrogen, which is flammable and corrosive.  Carbon monoxide detectors are susceptible to damage from hydrogen and may issue alarms due to small amounts of hydrogen.  VRLA (valve regulated sealed lead acid) batteries are designed to recombine the hydrogen with oxygen and are the only type that should ever be used indoors.  Never use automotive or marine type batteries indoors, even though you would love to have deep cycle rated batteries.  VRLA batteries come in two flavors:  AGM (absorbed glass mat) and gelled electrolyte.  AGM batteries are by far the more common, but either is fine for operating electronic equipment when commercial power is not available.  These batteries are used in most UPS applications and worn batteries that still have some life left are often available for reasonable prices.  New batteries can be purchased from a number of sources including Batteries Plus and Interstate Batteries.   Note that it is illegal to dispose of batteries containing lead; they must be recycled.  I have had luck taking discards to Interstate Batteries and WalMart. They may even be willing to pay a small amount (“core charge”) for larger sized batteries.

 Paralleling Batteries:

 It is absolutely okay to parallel lead acid batteries as long as they have the same voltage rating and are of the same construction. (Do not mix automotive type batteries and AGM type batteries, for example).  A concern is if one battery has an internal fault that causes self-discharge, it will indeed discharge the parallel battery, too.  There is an easy test to detect this:  with nothing connected to either battery, check the terminal voltage.  A week later, check the terminal voltage, again.  If the voltage on one battery has declined more than a couple of tenths of a volt, it is ready to be recycled.  If the open circuit terminal voltage on any stored "12 volt" lead acid battery drops below 12.4 volts, it needs to be recycled.

 I strongly urge the use of a fuse on each battery to protect the wiring.  A battery can deliver more than enough current to ignite the wire and anything nearby. Locate the fuse close to the battery terminal. Automotive fuses are inexpensive, readily available, and work well for nominal 12 volt applications.  Fuse sizing:  30 A for 10 gauge wire or larger, 20 A for 12 gauge wire, 15 A for 14 gauge wire, 10 A for 16 gauge wire.

 What the numbers mean:

 Voltage is the electrical potential, measured in volts (V),  that causes current to flow in a circuit.  Current, measured in amperes (A), is the movement of charge that actually transports the energy from one point in a circuit to another.  Energy, measured in joules (J), is the ability to do work; for example, making a lamp glow for ten minutes or pumping a gallon water ten feet higher than it was before.  Power, measured in watts (W), is the rate of energy delivery.  One watt is the delivery of one joule per second.  For direct current, power is simply calculated as volts multiplied by amperes.

 Hybrid units have often been used to measure energy.  For example, commercial electric energy is measured in “kilowatt-hours” (kWH).  One kWH is 3600000 J.  The energy capacity of a battery is usually rated in watt-hours.  Since batteries come in various voltage ratings, battery companies like to rate them relative to the cell sizes.  To remove the voltage from the energy rating, they rate batteries using “ampere hours” (AH).   Multiply AH by the voltage rating and you get the energy rating of the battery in WH, more or less.  Complicating all of this is that the actual voltage of the battery depends on load current and on state of charge.  Also, the AH rating of the battery varies with the current.  By law, the manufacturer must state the discharge rate used to specify the AH rating.  Usually, this is the current that would deplete the battery in 20 hours, expressed as “20 H”.  For example, a 33 AH battery can provide 1.65 A for 20 hours – 1.65 A X 20 H = 33 AH.  Discharging at a higher rate (more than 1.65 A) will result in fewer available ampere-hours; that is, less energy can be extracted.  Slower rates yield greater capacity.  This is why paralleling batteries will yield more energy than using one battery at a time.  The down-side of extracting more energy is that a deeper discharge will shorten the life of the battery. Never discharge a battery too deeply—for a “12 V” battery, remove the load when the voltage dips to 10.5 V and recharge the battery as soon as possible.

 The end of life for a lead-acid battery is defined as when the energy capacity of the battery drops below 80% of the rated energy capacity.  Often, a battery continues to be useful beyond its rated lifetime; for example, an old battery may still start your car as long as it does not get too cold outside.  This loss of capacity is caused by physical and chemical changes inside the battery and cannot be reversed.  Conditions that cause loss of capacity include: number and depth of discharge cycles, time spent in a discharged state, overcharging, storage at elevated temperatures, and the passage of time.

 The number one rule for keeping lead-acid batteries healthy is to keep them charged.  It is okay to use an automotive type charger to recharge, but do not leave the charger connected to the battery as most automotive type chargers do not have regulated voltage output and will overcharge the battery.  An ideal charger for most applications is a regulated power supply that puts out 13.6 Vdc.  This type can be left connected all of the time; this is called “float charging”.  If float charging is not used, the battery should be stored with nothing connected.  The charge should be topped every couple of months.

 Some good battery related web sites:

http://na.industrial.panasonic.com/products/batteries

http://www.csbbattery.com/

http://www.batteriesplus.com/

http://www.InterstateBatteries.com/

 Discussion of many battery chemistries:

http://www.powerstream.com/tech.html  

DE Robert Baker N8ADO

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