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FT-980 batteries
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Hello to all on the list.?? The 980 only requires 2 1.5V AA batteries.? But anything that produces 3 V will work OK,? Anything above that is OK.? Been a 980 user since 1983.? I was told by Chip K7JA to not use 9V types.? The receiver in the 980 is the basis for those in most later Yaesu gear. 73 Dave K4JRB -----Original Message-----
From: <[email protected]> Sent: Jan 4, 2022 1:46 PM To: <[email protected]> Subject: Re: [Yaesu-FT-980] 4.5v for battery backup? ? Hi Fred and Matt,?I am the owner of an FT-980 and the author of this modification. The backup battery is now a CR2032 !
I introduce myself, I am a radio amateur since 1990, RF engineer and I build my own transceivers. My FT-890 was given to me as a wreck (SN : 3C 010193), since then I take care of it and I made many small modifications.
F5SSL told me about this forum, I directly joined !.? I invite you to have a look on https://www.mods.dk/ to find all my articles.
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73 Jean-Matthieu (call me JMat) F5RCT
QTH Strasbourg North (East of France) ? |
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The 2 battery case of my FT-980 was destroyed 20 years ago by a mix of strong springs, low quality plastic and maybe some acid from bateries. I was silly enought not to note the polarity
I glued a new one to the metal cover but never connected it, because I feared I could place the wrong polarity, and I dont know if it is polarity protected. In a 9V battery using this clip-on system the male (solid, small and protruding) is positive and the female of larger diameter and some 4/6 sections is the negative. In the item receiving power is opposite. I dont know the logic in the FT-980, so if someone would be nice to check his original battery? case and plug I would thank any info on the polarity of the battery case. Of course the FT-980 would be opposite as is the receiver of power.? BTW, I read somewhere maybe here, that using 4.5V does not damage and makes memories last longer. It seems internally it works on 5V Final questions. Is this voltage input polarity protected?. Does anybody else have a damaged baterry case? or am I a rare case? I will try to find out, but I am not an expert reading complicated schematics. Supposed the info in there 73 EA1FC |
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I just looked at my battery holder for the two AA batteries in my FT-980.? Mine is slightly deformed due to what looks like extra strong springs but luckily for me no damage from battery leakage.? The polarity is the same as for a 9V battery.? The smaller solid connector is positive and the segmented connector is negative.
73 N9IB |
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to N9IB
Thanks a lot, so the battery holder has the positive in the solid one. Like a battery. The (my) "female" in the radio plug has a RED line. showing that that is positive and therefore there should be plugged the solid "male" from battery holder. I did not mention it, because I dont know if that was Yaesu idea, or I marked it myself when my battery holder was damaged. Maybe all radios have that red line in the "female" clip, I mean the one with the wire, not the battery holder.? In the meantime, I checked the service manual, and saw that the input has a diode to avoid inverse voltage. The other is ground. That is the good thing. The bad thing is that the diode goes directly to pin 20 of microprocessor Q05 and pin 15 of uP17 in CPU Unit. So the connector itself, I think it has to be handled with care to avoid static, What I have never done haha Again, thanks and 73 EA1FC |
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