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Reviews Categories | Ham Shack Clocks | MFJ Model 123 Eternity Atomic Clock Help

Reviews Summary for MFJ Model 123 Eternity Atomic Clock
MFJ Model 123 Eternity Atomic Clock Reviews: 4 Average rating: 3.8/5 MSRP: $79.95
Description: Solar powered Atomic Clock works for an "eternity"! Never need batteries! Never need to set time!

Ultra-efficient solar cells let ordinary room light power clock. It also replenishes built-in rechargeable battery to run clock in-the-dark.

The Eternity Atomic Clock automatically receives radio signals from WWVB atomic time radio transmitter for millisecond accuracy. It also automatically adjusts for daylight savings time.

LCD display is 2 inches tall and 6.75 inches wide .Choose 24 or 12 hour time format. Has a huge running seconds display.

Product is in production.
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KB3LFD Rating: 1/5 Feb 2, 2014 16:12 Send this review to a friend
good kitchen clock  Time owned: 0 to 3 months
I bought the 123B model, i suppose its some kind of upgrade over the 123. It is a good looking unit, i'll give it that.
I tried many, many times to set it in 24hr utc mode for the shack. It just will not hold the correct time, always running with a five hour difference from Fort Collins.
I have managed to get it to run correctly in 12hr mode , so it now hangs in the kitchen.
It has a very convoluted set up routine. The directions that came with it are poor and confusing. They should have put the various "set up" buttons on the face of the clock. Would have made setting the clock much easier!
I live in North east Pa and the clock was able to find and lock on to the signal from Fort Collins fairly soon. It does seem to go into search mode at 2am as it is supposed to, in order to "refresh" the time.
The day/ date and temp functions seem to work well.
Bottom line. If you are looking for a reliable shack clock for UTC time, keep looking.
I have since ordered another clock from a U.S.A. manufacturer for the shack...
N3OQD Rating: 5/5 May 12, 2008 20:38 Send this review to a friend
brief overview  Time owned: more than 12 months
Classy look abeit on the expensive side. Even so, I have had this one for about three years and it is always dead on. Never put any batteries in it as the little solar panels do the job fine. Catches the signal at night here on the east coast about 90% of the time. Not bad for being this far from Ft. Collins Colorado. One of the few things MFJ has that is better than the common doubious clich'e of "Mighty Fine Junk"
K5ADF Rating: 5/5 Jan 18, 2007 10:56 Send this review to a friend
Actually works  Time owned: more than 12 months
I have owned this clock for several years now with it mounted on the wall next to my radio station. Like others have said, this MFJ product actually works as advertised. There are other atomic clocks cheaper, but not solar powered. I have never had a problem with it not locking on to the time signal. My radio station is located on the first floor with a window, so I have not had any problems with the solar power feature. I use it to track the local time. The clock does contain a battery backup. My neighbor (non-ham) also has one mounted in their kitchen without problems. I have not had any RFI problems with this clock. One nice feature is the very large numbers that can be seen across the room. Since it is not designed to be a UTC clock, attempts are at your own risk. I am happy with my purchase.
N4KZ Rating: 4/5 Apr 9, 2004 05:23 Send this review to a friend
Good clock, bad instructions  Time owned: 0 to 3 months
This clock is attractive and theoretically should never need batteries. It has operated fine in my not-so-brightly lit basement ham shack.

Most hams will have purchased this clock to use it for UTC but beware because the directions do not tell you how to set it up for UTC. They tell you how to set it up for 24-hour operation but as we know that is not the same. In fact, if you set it for 24-hour operation as per the directions, the first time it locks onto WWVB, it will correct itself -- which will include automatically adjusting itself from UTC (if you have manually set it for that) back to your local time.

If you plan to use this clock for UTC, forgot the junk in the instructions about local time zones. Just set the clock for zero offset. In other words, pretend you live in Greenwich, England, and you have a zero hour difference between your local time and UTC. That way, when the clock locks onto WWVB at 2 a.m. each day, it will automatically adjust for that local time which happens to be UTC! Somehow this simple point eludes the Chinese manufacturer of this clock. But I have other digital atomic clocks from other companies and it eludes them too. (Or maybe all these clocks are made by the same Chinese company and there's just one blissfully uninformed clock company employee. Who knows!)

One final point -- and an important one. On some of these digital atomic clocks, the Daylight Savings Time function can be manually switched on and off. If that's your clock, leave the feature off. But this particular clock has an automatic DST function which cannot be switched off so twice a year you will have to readjust the clock. During DST, adjust the time zone difference to -1 hour but during Standard Time, adjust the clock to -0 time zone difference. I know. It's a pain but it's the price we pay for having a nice clock whick keeps accurate time and probably needs no batteries unless you live in a in a dimly lit cave -- which probably includes most of them.
73, Dave, N4KZ

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