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12 MONTH LIMITED WARRANTY 

 
M F J   E n t e r p r i s e s ,   I n c. 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. 

1. 

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 because 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 co

v

ered 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 gables, etc. sent to MFJ Enterprises, Inc. will be returned at the owner's expense 
unprepared. 

 
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-186RC 

MFJ Radio Controlled Watch 

General Information and Operating Instructions  

Thank you for purchasing the MFJ-186RC Radio Controlled Watch. Please read these 

instructions carefully before use. 
 
The MFJ-186RC works by receiving the time radio signal generated by the US Atomic Clock located in Ft. 
Collins, Colorado. Anyplace that can receive the signal can use the MFJ-186RC. 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 (NIST).  
 

Tips for improving reception: 

1. 

Avoid placing the watch near television sets, metal surfaces, computers, or any other electrical 
device that may interfere with the reception of the radio signal. 

2. 

Closed areas such as basements or metal buildings may also interfere with the reception of the 
radio signal. 

3. 

It is strongly recommended to start the signal reception at night when interference is lowest. 

 

FEATURES: 

• 

WWVB receiver for automatic setting to Eastern, Central, Mountain, or Pacific US time zones  

• 

LCD Display showing: hours, minutes, seconds, day of the week and date 

• 

E.L. Backlight 

• 

Alarm 

• 

Chronograph 

• 

Water Resistant up to 3 ATM 

• 

12 / 24 Hour format 

• 

Calendar range from 1-1-2000 to 12-31-2049 

 

BATTERY INSTALLATION: 

• 

The MFJ- 186RC already comes with the battery installed. 

• 

To change the battery, follow these steps: 1. Remove the 4 screws on the back of the watch with a 

jeweler's screwdriver and remove the 

cover. 

2. Remove black plastic film from the back. 
3. 

Release the catch on the metal bracket as shown below. 

4. Remove the old battery and replace with a 3V, CR1620 coin battery or equivalent. 5 .   After 
replacing the battery, replace all parts & screws. 

 

 

P u l l   t a b   d o w n   t o   r e l e a s e   b a t t e r y  

 
N O T E :   It is not recommended that the movement be removed from the case. The internal antenna is 
embedded in the case and the wires to the antenna will easily break if removed. 

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