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Calling N8KDV
Hi.
As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity |
Maximus wrote: Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity What you'd probably rather get is a 12 volt gel cell and a trickle charger. Steve Holland, MI |
Hey V...go down to Battery World or something close, perhaps a local auto
parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell) and a charger for it. I run most of my stuff off this type of battery. No hydrogen build up either. "Maximus" wrote in message hlink.net... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity |
Thanks everyone ! But about the current, how much current is a gel cell going to provide ? My concern was burnin gup the radio because the battery would produce too much current. That was why I mentioned the mathematical handicap LOL. I was thinking I would have to reduce the current with a resistor or something, and had no idea how I would calculate the value of the resistor. Thanks very much S. P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW version that I could insert in a signature. V "Freddie" wrote in message nk.net... Hey V...go down to Battery World or something close, perhaps a local auto parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell) and a charger for it. I run most of my stuff off this type of battery. No hydrogen build up either. "Maximus" wrote in message hlink.net... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity |
Maximus wrote:
Thanks everyone ! But about the current, how much current is a gel cell going to provide ? My concern was burnin gup the radio because the battery would produce too much current. That was why I mentioned the mathematical handicap LOL. I was thinking I would have to reduce the current with a resistor or something, and had no idea how I would calculate the value of the resistor. Thanks very much S. P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW version that I could insert in a signature. If the battery is close to the correct voltage for the radio (12-V in your case), it will use the right amount of current without having to regulate it. The larger the battery capacity in Mah or Ah, the longer the radio will run before you have to recharge the battery. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
The gel cell should certainly provide enough current. Your radio will not burn
up, it will draw the amount of current that it needs, regardless of how much the gel cell is capable of providing. Maximus wrote: Thanks everyone ! But about the current, how much current is a gel cell going to provide ? My concern was burnin gup the radio because the battery would produce too much current. That was why I mentioned the mathematical handicap LOL. I was thinking I would have to reduce the current with a resistor or something, and had no idea how I would calculate the value of the resistor. Thanks very much S. P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW version that I could insert in a signature. V "Freddie" wrote in message nk.net... Hey V...go down to Battery World or something close, perhaps a local auto parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell) and a charger for it. I run most of my stuff off this type of battery. No hydrogen build up either. "Maximus" wrote in message hlink.net... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity |
Lantern bateries come in 6-volt and 12-volt versions. They ain't cheap and they
often derate by setting on a store shelf a long time. The little gel cell, float-charged by an ac or dc adapter, or solar cell, will work fine. Any of these should provide current at least equal to the duty cycle of the load current. Your radio requires 500 ma. So, if you use the radio an average of one hour out of every ten, then the charger should provide at least 50 ma. A correction regarding your suggested series connection of batteries: Connect the positive terminal of one to the negative terminal of the other. The far ends then would connect positive to positive and negative to negative on the radio. Bill, K5BY |
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Regardless of the power source AC or DC. 1. If the Voltage is approprite (matched to) for the Device. 2. Then it is the Device (Load) that determines the Current Flow. EXAMPLE: A small 115VAC powered Transistor Radio plugged into the 20 Amp 115VAC Outlet will NOT draw 20 Amps and Burn Out. be101 ~ RHF = = = Basic Electricity 101 .. .. = = = starman = = = wrote in message ... Maximus wrote: Thanks everyone ! But about the current, how much current is a gel cell going to provide ? My concern was burnin gup the radio because the battery would produce too much current. That was why I mentioned the mathematical handicap LOL. I was thinking I would have to reduce the current with a resistor or something, and had no idea how I would calculate the value of the resistor. Thanks very much S. P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW version that I could insert in a signature. If the battery is close to the correct voltage for the radio (12-V in your case), it will use the right amount of current without having to regulate it. The larger the battery capacity in Mah or Ah, the longer the radio will run before you have to recharge the battery. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Thanks again. It is good to know ! enjoy your evening.
V "N8KDV" wrote in message ... The gel cell should certainly provide enough current. Your radio will not burn up, it will draw the amount of current that it needs, regardless of how much the gel cell is capable of providing. Maximus wrote: Thanks everyone ! But about the current, how much current is a gel cell going to provide ? My concern was burnin gup the radio because the battery would produce too much current. That was why I mentioned the mathematical handicap LOL. I was thinking I would have to reduce the current with a resistor or something, and had no idea how I would calculate the value of the resistor. Thanks very much S. P.S. the "V" is "V for Victory". I couldn't figure out how to make a CW version that I could insert in a signature. V "Freddie" wrote in message nk.net... Hey V...go down to Battery World or something close, perhaps a local auto parts store...and buy yourself a 14Ahr sealed lead acid battery (gel cell) and a charger for it. I run most of my stuff off this type of battery. No hydrogen build up either. "Maximus" wrote in message hlink.net... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity |
"Maximus" wrote in message news:IK2Kb.37528
"Maximus" wrote in message hlink.net... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. The DX-394 draws from 170 to 200 mA, not 500 mA, so any 12V battery capable of a few hundred mA-hours will be able to run it. The larger the ampere-hour capacity, the longer it will run without recharging. For lots of info on the DX-394, consider joining the group http://groups.yahoo.com/group/RADIOSHACKDX394/ (at the moment, Yahoo seems to have a serious problem and nothing can be found on the group website but it should be restored soon.) Tom |
I have a DX-394 that I converted to run off 8AA's or a wall wart
works great "Maximus" wrote in message thlink.net... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. V Solidarity |
In article k.net,
says... Hi. As a ham radio man, I am hoping you can help me out. I have a DX394 receiver and usually use ac to power it. I can run from a car battery, with the adaptor. It requires 12 volts at 500 Ma. What I am wondering is if I can build an emergency power supply so I can listen using batteries when the trees take out the power lines s. What I thought I could do is get a 9v lantern battery and add two 1.5 volt D Cells . I am not mathematically inclined in the least. If I connect the positive of the lantern and the negative of the lantern to the corresponding terminals of the two D Cells, and connect all that to the adaptor plug for the back of the receiver, will it supply sufficient current to run properly or not ? I could probably get an actual car battery, but would rather not have that in the apartment. Lantern batteries are 6v, I think, so hooking two of those in series should give you plenty of backup power. Since I also operate QRP for the ham radio portion of my radio hobby, using my Yaesu FT-817, I have one of those lunchbox-sized 12v battery packs. I think Ham Radio Outlet has them for around $40 but you can get them cheaper (I paid about $25 for mine). Has terminal posts on the back, plus a cigarette lighter-type socket on the front. Separate connection on the side for delivering 3v/6v/9v if desired. Can be charged from the car or via house current, and can even help start your car if you have a dead battery. That would probably be overkill for just powering a Yacht Boy, but I've found it to be a very handy accessory. -- -- //Steve// Steve Silverwood, KB6OJS Fountain Valley, CA Email: |
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