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IFR Com 120B replacement RTC

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AdrianH
Posts: 32
Joined: Fri Mar 16, 2018 12:03 pm
What radios do you own?: Yaesu FT-857, FT-902DM, FT70

IFR Com 120B replacement RTC

Postby AdrianH » Tue May 22, 2018 12:38 pm

So as the Dallas RTC the DS1286 has been out of production for some years and there are doubts about the age of so called new ones. I decided as well as getting a two DS1286's to buy two DS1284 chips basically what is in the 1286 and to add my own crystal and battery.

So I did these. One has a CR1220 cell holder and the other with holder has a CR2032 cell fitted.

Image

The top of the chip was roughed up with emery as was the base of the battery holders and epoxy used to hold everything in place.

All I can say is that they work, the smaller CR1220 battery which I guess is the size as fitted normally is only around 40mAH. The CR2032 is typically around 240mAH. Although I doubt capacity is the issue more like shelf life.

But it works in the test set, so at least I have a few options for RTC playing!
Image

Adrian

popcicle90
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Posts: 5
Joined: Sat Sep 20, 2008 10:50 am

Re: IFR Com 120B replacement RTC

Postby popcicle90 » Fri Jun 22, 2018 3:48 pm

How did you manage to keep your options if you replaced the RTC? Are you able to read the old one (somehow), or do you have the options codes for your unit?

User avatar
AdrianH
Posts: 32
Joined: Fri Mar 16, 2018 12:03 pm
What radios do you own?: Yaesu FT-857, FT-902DM, FT70

Re: IFR Com 120B replacement RTC

Postby AdrianH » Sun Jun 24, 2018 4:13 pm

It may be possible to remove the RTC and read it therefore you can save the RTC for the future. It is a bit like playing Russian Roulette, for some it works for some it means loosing everything as removing the chip can trigger a total loss.

I used an Eprom programmer to read and program another RTC initially before making one just for the task. No I do not have the pass codes that would mean either a crack of the software or someone has the codes. Either way not something to be discussed on here.

Adrian


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