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The batteries in your portable HF

There are many beliefs about the batteries used in portable devices such as HF COM-O-PAC (5C et 10), Marconi (CP-24, CP-34), Spilsbury (SBX-11, 11A), JRC (JSB-20) etc. It should be recalled that these devices are designed to consume little power in receipt but sought surge currents during periods of transmission (how long the batteries will need to provide a current often 40 times larger than receipt!) Usually, only serve for a limited period in the year. The batteries used must meet the following criterias:


• Rate of low self: that the cells are still good for several months after it was installed. In an emergency we must rely on batteries.

• low internal resistance: to be able to debit the current requirements in transmission.

• Capacity high: to last long enough in normal use.

• Availability: so you can get everywhere.

 
The characteristics listed above thus promote alkaline batteries (eg Energizer, Duracell). Indeed they are well suited to this kind of use. The nickel-cadmium rechargeable batteries are a bad choice considering that the investment required for the purchase of batteries ni-cad good quality will not be amortized by the end of the useful life of these. I emphasize "good" because most of the rechargeable batteries size "D" found in the shops are actually cell size "C" inflated in "D". Rechargeable batteries are useful in appliances often (eg rechargeable shaver, toys, etc.) Otherwise, the batteries are developing a memory effect that prevent, once the time came to work, to provide their rated power . In addition, it will discharge about 1% of their capacity daily (30% per month!) Even in the best case, a battery ni-cad format "D" of good quality (4 Ampères-heure) will be a life worth less than one third of that of an alkaline battery (14 Ah typical). For your annual trip hunting or fishing, the latters represent a value much more secure. The zinc-carbon batteries (batteries non-alcalines) can not charge current required transmission in long enough. In all cases, the batteries would give their full capacity to withstand temperatures of 10C and above. However, they degrade more slowly if they are kept cold.
 
 
Conception R.B. senc
 
 
 

 
 
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