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d.c. input spec for icom 735
Greetings
I am in the process of putting together (battery power supply) for my amateur radio equipment....I have an ic 735 and ic 275a. I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. My battery analyzer, cadex 7000, can only analyzer a series string of 1 to 12 cells. Larry ve3fxq |
On Thu, 15 Jan 2004 02:20:46 GMT, "larry" wrote:
Greetings I am in the process of putting together (battery power supply) for my amateur radio equipment....I have an ic 735 and ic 275a. I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. My battery analyzer, cadex 7000, can only analyzer a series string of 1 to 12 cells. Larry ve3fxq My Icom 735 manual specifies the power supply requirements: 13.8V DC, plus or minus 15%, negative ground. At 200 watts input, it pulls about 20 amps. Receiving, about 1.5 amps, or 1.2 amps, squelched. Later in the manual, it says for battery power, you can go with 12 to 15 volts. It also mentions that anything over 15 volts may damage the rig. Bob k5qwg |
On Thu, 15 Jan 2004 02:20:46 GMT, "larry" wrote:
Greetings I am in the process of putting together (battery power supply) for my amateur radio equipment....I have an ic 735 and ic 275a. I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. My battery analyzer, cadex 7000, can only analyzer a series string of 1 to 12 cells. Larry ve3fxq My Icom 735 manual specifies the power supply requirements: 13.8V DC, plus or minus 15%, negative ground. At 200 watts input, it pulls about 20 amps. Receiving, about 1.5 amps, or 1.2 amps, squelched. Later in the manual, it says for battery power, you can go with 12 to 15 volts. It also mentions that anything over 15 volts may damage the rig. Bob k5qwg |
I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. A fully charged NiCd battery, in good condition, usually tops out about 1.4 volts. If you charge up a string of 12 batterier, this will reach about 16.8 volts; definitely has the potential to damage your radio. Even a string of 11 can be fully charged to 15.4 volts.... still risky to your radio. If I had no other battery options, I'd go with a string of 10. Fully charged they'll reach 14.0 volts, and probably rapidly drop to 12 volts (1.2 nominal volts per cell) shortly after you begin using them. This is a bit on the low side, but at least safer. Personally, I'd go with a nice Lead Acid type 12 volt battery. Your 4AH cells are way too low current capability for that IC735 Transmitter,anyway. Ed WB6SAT |
I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. A fully charged NiCd battery, in good condition, usually tops out about 1.4 volts. If you charge up a string of 12 batterier, this will reach about 16.8 volts; definitely has the potential to damage your radio. Even a string of 11 can be fully charged to 15.4 volts.... still risky to your radio. If I had no other battery options, I'd go with a string of 10. Fully charged they'll reach 14.0 volts, and probably rapidly drop to 12 volts (1.2 nominal volts per cell) shortly after you begin using them. This is a bit on the low side, but at least safer. Personally, I'd go with a nice Lead Acid type 12 volt battery. Your 4AH cells are way too low current capability for that IC735 Transmitter,anyway. Ed WB6SAT |
This responce is to both Bob and Ed...
Actually my plan is to parallel at least 2, if not more, of these nicad batteries together... With your comments I think I may start out at 10 cells.... Thank you, muchly, for your input....appreciated... Larry ve3fxq "Ed G." wrote in message . .. I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. A fully charged NiCd battery, in good condition, usually tops out about 1.4 volts. If you charge up a string of 12 batterier, this will reach about 16.8 volts; definitely has the potential to damage your radio. Even a string of 11 can be fully charged to 15.4 volts.... still risky to your radio. If I had no other battery options, I'd go with a string of 10. Fully charged they'll reach 14.0 volts, and probably rapidly drop to 12 volts (1.2 nominal volts per cell) shortly after you begin using them. This is a bit on the low side, but at least safer. Personally, I'd go with a nice Lead Acid type 12 volt battery. Your 4AH cells are way too low current capability for that IC735 Transmitter,anyway. Ed WB6SAT |
This responce is to both Bob and Ed...
Actually my plan is to parallel at least 2, if not more, of these nicad batteries together... With your comments I think I may start out at 10 cells.... Thank you, muchly, for your input....appreciated... Larry ve3fxq "Ed G." wrote in message . .. I have a number of rechargable nicad batteries 4.400 amp hour and 7.0 amp hour.. 1.25 volts.. I need some information about the ic equipment which I can't seem to find in the manual... In the manual the d.c. input reads 12 volts... Can someone tell me what the safe upper limit of these radios tend to be? I don't plan to come anywhere need the upper limit but I would perfer to make a battery pack containing 12 x 1.25 volt cells rather than 11 cells. A fully charged NiCd battery, in good condition, usually tops out about 1.4 volts. If you charge up a string of 12 batterier, this will reach about 16.8 volts; definitely has the potential to damage your radio. Even a string of 11 can be fully charged to 15.4 volts.... still risky to your radio. If I had no other battery options, I'd go with a string of 10. Fully charged they'll reach 14.0 volts, and probably rapidly drop to 12 volts (1.2 nominal volts per cell) shortly after you begin using them. This is a bit on the low side, but at least safer. Personally, I'd go with a nice Lead Acid type 12 volt battery. Your 4AH cells are way too low current capability for that IC735 Transmitter,anyway. Ed WB6SAT |
Connecting batteries in parallel is not a good idea.
They will begin to discharge each other. My .02 '73 Pat |
Connecting batteries in parallel is not a good idea.
They will begin to discharge each other. My .02 '73 Pat |
Connecting batteries in parallel is not a good idea. They will begin to discharge each other. I agree with that. Plus, if that guy plans on using the IC-735 transmitter at anywhere near its full power capability, even 2 4.5AH batteries paralleled would be insufficient current capability. I don't understand why someone would want to go to such lengths to use a bunch of NiCd cells when the cost of a small automotive or motorcycle 12V lead acid battery isn't that much, and would work much better. Ed |
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