MFJ MFJ-121 User manual

Z
12 MONTH LIMITED WARRANTY
MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ
Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to
be free from defects in material and workmanship for a period of 12 months from date
of purchase provided the following terms of this warranty are satisfied.
I. Thepurchasermustretainthedatedproof-of-purchase(billofsale,canceledcheck,creditcardormoney
orderreceipt,etc.)describingtheproducttoestablishthevalidityofthewarrantyclaimandsubmit the
originalormachinereproductionofsuchproof-of-purchase to MFJ Enterprises, Inc. atthetimeofwarranty
service.MFJEnterprises,Inc.shallhavethediscretiontodenywarrantywithoutdatedproof-of-purchase.
Anyevidence of alteration, erasure, or forgery shall because tovoid anyand all warranty terms immediately.
2.MFJEnterprises, Inc. agrees to repair or replace at MFJ's option withoutcharge to the originalownerany
defective product under warranty, provided the product is returned postage prepaid to MFJ Enterprises, Inc.
withapersonalcheck,cashierscheck,ormoneyorderfor$7.00coveringpostageandhandling.
3. MFJEnterprises,Inc.willsupplyreplacement parts free of charge for any MFJ product underwarrantyupon
request.Adatedproof-of-purchase and a $5.00 personal check, cashiers check, ormoney order must be
providedtocoverpostageandhandling.
4. ThiswarrantyisNOTvoidforownerswhoattempt to repair defective units. Technical consultation is available
bycalling(662)323-5869.
5.ThiswarrantydoesnotapplytokitssoldbyormanufacturedbyMFJEnterprises,Inc.
6. WiredandtestedPCboardproductsarecoveredbythiswarrantyprovidedonlythewiredandtested PC board
productisreturned.WiredandtestedPCboardsinstalledintheowner'scabinetorconnectedtoswitches,
jacks,or cables, etc. sent to MFJ Enterprises, Inc. will bereturned at theowner's expense unrepaired.
7. UndernocircumstancesisMFJEnterprises,Inc.liableforconsequentialdamagestopersonorproperty
bytheuseofanyMFJproducts..
8. Out-of-warrantyService: MFJ Enterprises, Inc. will repair any out-of-warranty product provided theunit is
shipped prepaid. All repaired units will be shipped COD to the owner. Repair charges will
beaddedtothe
CODfeeunlessotherarrangementsaremade.
9.Thiswarrantyisgiveninlieuofanyotherwarrantyexpressedorimplied.
10.MFJEnterprises,Inc.reserves the rightto makechanges or improvementsin design ormanufacturewithout
incurring any obligation to install such changes upon any of the products previously manufactured.
11.AllMFJproductstobeservicedin-warrantyorout-of-warrantyshould be addressed to MFJ Enterprises,Inc.,
300Industrial Park Road, Starkville, Mississippi 39759, USA andmust beaccompanied by a letter describing
theproblemindetailalongwithacopyofyourdatedproof-ofpurchase.
12.Thiswarrantygivesyouspecificrights,and you may also have other rights which varyfrom state tostate.
MFJ Enterprises, Inc.
300 Industrial Park Rd
Starkville, MS 39759 USA
MFJ-121 Dual Time Atomic Clock
Instruction Manual
The MFJ-121 works by receiving the time radio signal generatedby the US Atomic Clock
located
in Colorado. Any place that can receive the signal can use the MFJ-121. Any place
that cannot
receive the signal will have to set the time manually. The Atomic Clock in
Colorado is operated by
the US Department of Commerce's National Institute Standards and Technology.
To enhance good
reception of the signal, avoid placing your MFJ-121 near
televisionsets,metalsurfaces,computers,
or any other electrical device that may interfere withthe reception of the radio signal.
FCC Statement
The MFJ-121 might cause TV or radio interference when operating properly. To determine
whether the MFJ-121 is causing interference, take out the batteries to turn it off. If the
interference goes away, the MFJ-121 is causing the interference.Try to eliminate theinterference
by reorienting the MFJ-121 and/or increasing the separation between yourequipment and the MFJ-
121. If you cannot eliminate the interference, the FCC requires that you stop using the clock.
Display and Mounting
The upper LCD display show the time and radio signal mark. The lower LCD display can beset
to another time zone. The unit can be placed on a desktop by pulling out the stand at the back or
mounted on a wall (mounting hardware not included).
Battery Replacement and Initialization
The MFJ-121 uses two AAA batteries (not included). Open the battery cover and insert the
batteries according to the polarity shown inside the battery compartment. If the LCD Display
becomes dim, replace the batteries with new ones.

Setting the Upper LCD Display
Setting the Time Zone
With the MFJ-121 in the normal time display mode, move the slide switch on the back of the clock
to the "TIME" position. Then press the "SET" button. The upper LCD will show "-0 HR", "-1
HR", etc. (It will be "-0 HR" if no time zone was previously selected). Select the appropriate time
zone by pressing the A button to increase the number. Please refer to the table below for setting the
time zone of your area in the USA.
Time Zone Standard Time Setting
Pacific "-8 HR"
Mountain "-7 HR"
Central "-6 HR"
Eastern "-5 HR"
GMT "-0 HR"
Note: The number following the "-X HR" indicates the number of hours difference from
GMT.
After setting the appropriate time zone, press the "SET" button again to proceed with setting the 12
HR or 24 HR time Display
Setting 12 HR or 24 HR Display
The LCD should now display a flashing" 12" or "24" and "H" that is not flashing. Press the A
button change between 12 HR and 24 HR time display mode. After selecting the time display
mode, press the "SET" button to proceed to Setting the Time Manually.
Setting the Time Manually
Since the unit works on receiving the time radio signal, there may be locations that the signal
is weak
and cannot he properly received. Under such conditions, the radio signal mark will
not
display any curves. Try to rotate the unit or place it in another location to achieve better reception.
Re-install the batteries or press the "TEST" button to initialize the reception again.
If the radio signal
still cannot be received, the time should be set manually.
After setting the 12HR or 24 HR display mode, press the "SET' button once to bring the unit to time
setting mode. The hour digits will begin to flash. Press the A button to change the hour digits to the
proper time. Press the "SET" button again and the minutes digits will begin to flash. Press the A
button to change the minutes digits to the proper time. Press the "SET" button again and the
seconds digits will begin to flash. Press the A button to change the seconds
digits to the proper
time. After setting the hours, minutes, and seconds, press the SET button once to return to the
normal time display. Then move the slide switch back to the "LOCK" position.
Note: Returning the slide switch to the "LOCK" position at anytime during the setting
procedure will cause the LCD to remain at the last step completed. To ensure proper operation of
the MFJ-121, the slide switch should not be returned to the "LOCK" position until the LCD
displays the time with no digits flashing.
Setting the Lower LCD Display
With the MFJ-121 in the normal time display mode, move the slide switch on the back of the clock
to the "TIME II" position. Follow the same procedure as Setting the Upper LCD Display.
Daylight Savings Time
The time receiver in the MFJ-121 will automatically detect Daylight Savings Time. This
feature cannot be disabled. The MFJ-121 will automatically adjust the time during
Daylight Savings
time so you will not have to change the time zone. During Daylight Savings Time the symbol "*
D.S.T" will be shown above the seconds on both LCD displays. If you live in an area that does not
observe Daylight Savings Time or want to display GMT, you must set the Time Zone -1 HR from
the current setting to compensate.