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.
The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit card or money
order receipt, etc.) describing the product to establish the validity of the warranty claim and submit the
original or machine reproduction of such proof-of-purchase to MFJ Enterprises, Inc. at the time of warranty
service. MFJ Enterprises, Inc. shall have the discretion to deny warranty without dated proof-of-purchase.
Any evidence of alteration, erasure, or forgery shall be cause to void any and all warranty terms immediately.
2. MFJ Enterprises, Inc. agrees to repair or replace at MFJ's option without charge to the original owner any
defective product under warranty, provided the product is returned postage prepaid to MFJ Enterprises, Inc.
with a personal check, cashiers check, or money order for $7.00 covering postage and handling.
3. MFJ Enterprises, Inc. will supply replacement parts free of charge for any MFJ product under warranty upon
request. A dated proof-of-purchase and a $5.00 personal check, cashiers check, or money order must be
provided to cover postage and handling.
4. This warranty is NOT void for owners who attempt to repair defective units. Technical consultation is available
by calling (662) 323-5869.
5. This warranty does not apply to kits sold by or manufactured by MFJ Enterprises, Inc.
6. Wired and tested PC board products are covered by this warranty provided only the wired and tested PC
board
product is returned.
Wired and tested PC boards installed in the owner's cabinet or connected to switches,
jacks, or cables, etc. sent to MFJ Enterprises, Inc. will be returned at the owner's expense unrepaired.
7.
Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to person or property
by the use of any MFJ products. .
8. Out-of-warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty product provided the unit is
shipped prepaid. All repaired units will be shipped COD to the owner. Repair charges will be added to the
COD fee unless other arrangements are made.
9. This warranty is given in lieu of any other warranty expressed or implied.
10. MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or manufacture without
incurring any obligation to install such changes upon any of the products previously manufactured.
11. All MFJ products to be serviced in-warranty or out-of-warranty should be addressed to MFJ Enterprises, Inc.,
300 Industrial Park Road, Starkville, Mississippi 39759, USA and must be accompanied by a letter describing
the problem in detail along with a copy of your dated proof-ofpurchase.
12. This warranty gives you specific rights, and you may also have other rights which vary from state to state.
MFJ Enterprises, Inc.
300 Industrial Park Rd
Starkville, MS 39759 USA
MFJ-121 Dual Time Atomic Clock
I n s t r u c t i o n M a n u a l
The MFJ -121 works by receiving the time radio signal generated by 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 television sets, metal surfaces, computers,
or any other electrical device that may interfere with the reception of the radio signal.
F C C S t a t e m e n t
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 the interference
by reorienting the MFJ-121 and/or increasing the separation between your equipment and the MFJ -
121. If you cannot eliminate the interference, the FCC requires that you stop using the clock.
Display and Mounting
The upper L CD display show the time and radio signal mark. The lower LCD display can be set
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.
