TRANSMISSION & RECEPTION OF MESSAGES FROM ONE STATION TO BE ENCODED OR DECODED AT ANOTHER STATION
Station 53A and 53C only, are quoted in the following example, which deals with JEDBURGH traffic received via an outstation.

These messages will not be identifiable as JEDBURGH messages at the time of receipt. they will be passed to Registration in the normal manner. registration will give each message an "A" serial number and pass it to CODES in the usual way.

Each JEDBURGH message for relay will contain routing instructions "en clear". these will consist of two letters repeated to make up a four letter group (e.g. GVGV) followed by the pad number. This will enable Codes to identify messages quickly and with certainty, and either re-route, decode, or, if not in possession of the pad, pass to the correct Station for decoding. Re-routing without decoding can only occur if multi-way pads are used.
What is a multi-way PAD?

After CODES have decided that any particular message or messages are from a JEDBURGH party, they will prepare a SKELETON copy on a green form for onward transmission to HQ Signal office.

For example "Passing a message from 53A to 53C"

A1234 (being the "A" Serial number supplied by Registration)
From JEDBURGH party via ACTOR.
"Message passed to 53C for decoding on set number
Pad number/numbers under local AC number

CODES will also insert in the Service Instruction of the original copy:

Live message for decoding.
Identity group
Set number
Pad number/numbers

The green form will than be pinned to the original message and both copies sent to Registration.


Registration will:

Enter the appropriate particulars in the local AC (53A to 53C) Register.
Allocate to the ORIGINAL message a local AC number.
Enter the local AC number in the appropriate place on the SKELETON copy (Green Form)
Pass the Green Form to Teleprinters for onward transmission to HQ-SO.
Despatch the ORIGINAL message to Station 53C without delay.
Complete the appropriate columns in the Main Register. "Forwarded to Station 53C (see AC number ...)".


Upon receipt Station 53C will:

Enter the time handed in to Station 53C in the T.H.I. space on the front of the message form. T.H.I. if passed by the teleprinter, will be the time of "Release", if by DRLS the T.H.I. will be shown on the original copy.

Enter in the main "IN Register" showing "A" Serial number in the extreme left-hand column.

Write the "C" Serial number in front of the "A" Serial Number, e.g. C 1674/A 1234.

Pass to CODES for decoding in the normal manner.


CODES will:

Enter the double Serial number (as shown above) in the CODES IN Register.
After decoding, write the decoded version on a green form in the normal manner and pass the message back to Registration, bearing the following particulars:

Name of CODE plan via name of WT plan
In the Service Instruction "Received at Station 53A, decoded at Station 53C".


REGISTRATION will enter all relevant particulars in the appropriate columns of the main WT IN Register, file the original WT copies in a special file marked "Jedburgh Messages received via Station 53A" and pass the green form to Teleprinters.


TELEPRINTERS will:

Teleprint the double serial number in the manner shown above.
Ensure that the ROUTINE and SERVICE instructions are correctly teleprinted in HQ.
HQ-SO will NOT clear messages of the description until the decoded versions bearing the double serial numbers (see para CODES, above) have been received from Station 53C.

The detail of the above instruction refers to JEDBURGH messages received via agents but the methode can be equally well applied to any message received at one Station for decoding at another.

e.g.
For BARDSEA traffic received over agent circuit, substitute BARDSEA for JEDBURGH and the appropriate station for "A" and "C" in above wording.
For agent traffic received over JEDBURGH circuit, substitute OUTSTATION for JEDBURGH and JEDBURGH for OUTSTATION, "Station A" for "Station C" and "Station C" for "Station A".

It is frequently necessary to transmit messages from a Station that does not hold the necessary code. The message will therefore have to be encoded at a different Station.

The following example deals with a message for an agent sent over a JEDBURGH link.

When a message is originated by a country section and passed by HQ-SO for an agent controlled by Station 53A to be broadcast by Station 53C:

HQ-SO will register the message in the "C" and "A" registers and give it a 53C/53A double serial number.

The message will be sent in full to Station 53A and in SKELETON to Station 53C.

In the version sent to Station 53A the Service Instructions will include "To be encoded at 53A for transmission by Broadcast/two-way sked from 53C and will therefore take the following form e.g.

"A 1234/C 6028. Priority "B" (if for broadcast) Section FF. TO SNORTER via WISECRACK. B/C number, prefix, date, Originator number. Service instruction: - to be encoded at 53C for transmission by broadcast from 53C (Text of message).

The SKELETON version sent to Station 53C will take the same form as the version to Station 53A except that it will not include the text and the service instructions will read "Message passed to 53A to for encoding". e.g.

C 6028/A 1234, Priority B (if for Broadcast) Section FF. TO SNORTER via WISECRACK B/C number, prefix, date, originator number. Service instruction: - "Message passed to 53A for encoding"

The message will then be dealt with in a manner similar to the procedure set out for inward messages. (See Special Signal Instruction number 35). The encoded versions bearing the service instruction (via Broadcast) Two way sked Station 53C.

In the two-hourly traffic report the encoding station will advice HQ-SO that a particular message has been forwarded to the transmitting station, e.g. (a message encoded at Station 53A to be broadcast/two-way sked from Station 53C)

"To 53C    A1234     AC0610"

HQ-SO will then be in a position to follow the flow of traffic and ensure that this particular message is passed to the OUTSTATION concerned and a final clearance can be expected from the transmitting station (53C).

When no traffic is passed between stations, a "NIL" return will be shown in the appropriate columns e.g

"To 53C    NIL        NIL".

The above example deals with a case between Station 53A and 53C, but any message for encoding at one station and transmission from another can be handled in a similar manner.




                                                                       16-04-2022