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G0FTD > TECH 08.08.04 22:29l 44 Lines 1843 Bytes #999 (0) @ EU
BID : 976333G0FTD
Read: GUEST OE7FMI
Subj: Batteries | Holders |FT290's
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<GB7CIP<GB7SXE
Sent: 040808/1907Z @:GB7SXE.#38.GBR.EU #:512 [Hastings] FBB7.00i $:976333G0FTD
From: G0FTD@GB7SXE.#38.GBR.EU
To : TECH@EU
I recently acquired a very cheap FT290 MK1 recently and once again the
problems of batteries has reared it's head again.
I have found that there is a very basic problem which often occurs with
battery operated equipment - high resistance connections.
Yes - just plain old air oxidisation and dirt on the terminals of the
batteries for mwhich the symptoms are premature failure of batteries and
the requirement for a recharge.
Now because I often use handheld radio's I have become acutly aware of
how long my batteries should last and I clean the actual nicads (or nimh!)
terminals with an alcohol based cleaner or with silver paper.
Try it and you will be surprised.
With my newly acquired FT290 I became even more aware of this problem
when the ssb rx kept changing slightly with the varying resistance
across the terminals. Simply turning the radio around it's axis would
produce a definate frequency change !
This effect doesn't show up on basic FM handhelds due the robustness of FM
to small frequency changes - but in fact may still be occurring - it's
just that you can't see it in the field so to speak.
So the moral of the story is - basic cleanliness of the batteriy terminals
MUST be practised if you want to get more operating time out of your
battery packs.
I suspect any rigs placed in a smokey or dirty environment will suffer
to a greater degree.
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ 73 - Andy ³
³ G0FTD ³
³ Whitstable, Kent ³
³20:02 on 2004-Aug-08³
³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³
³ ³ Û ³ ³
ÀÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÙ
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