How to Manually Decrypt
a One Time Pad Message using a No.03086 Conversion Table

1.    Open a new text file in which to save every step,  then archive it when your message has been
       fully decrypted.  That will make troubleshooting less tedious should it not work correctly
       the first time.

2.   Copy the entire received encrypted QTC and save it to the new text file.   Keep the text file open.

3.   Check the date in the preamble;   use this day number to select the correct key page.
      The key pages may be downloaded for instant reference.  No need to destroy them after use as
      would normally be the case with OTP key pages in security-critical environments. 
     For amateur radio deployment we reuse them every month.

4.   The first 5-digit group in the message field is the key locator.   It can be found in the appropriately dated key page using a normal <Ctrl-F> search.  Having found the key locator,  copy and paste to your text file at least as many key groups AFTER the key group as there are 5-digit groups in the received message.   If the key locator is close to the bottom of the page, it will likely be necessary to copy all the groups below it, plus more groups working down from the top.  Save all these groups to your text file, but don't include the key locator group since it has already fulfilled its purpose to identify where the key groups begin.

5.   Write the 5-digit message groups a cross a multicolumn sheet of paper, then arrange the 5-digit key groups beneath.   Perform Modulo-10 addition on each 2-digit vertical column.   That means there is nothing to carry to the next-left column when the sum of any column is greater than 10.   

6.  Now the resulting 5-digit groups are ready to be converted from code to plain text using a prescribed conversion table,  in this case it is No. 30386 shown below.

    This is conversion table  No. 03086  was used to originally code the message.    Each 5-letter group in the revealed text is not in isolation.  There will be many instances where a character code spans two groups.  e.g.    'G'  may be represented by the last digit, a 7 in one group,  and the first digit, a 4 from the following group.

7.     This final move may or may not be necessary.   
        If the encrypting operator made correct use of the space code 99,
        inserting and deleting spaces to form the text into readable words may not be necessary.