1. Introduction

RIW, the Navy Headquarter, can be heard regularly and with good signal quality. RIW allocates frequencies for further traffic, transmits encrypted messages and relays for other stations. Weather forecasts and Nautical Warnings are not disseminated by RIW, xxx Flash Messages very rarely.

Frequently stations ask for link establishment in digital mode or in encrypted voice mode. Well known is MS-5, a parallel 12 tone 120 Bd. Voice Encryption System (VOCODER), working at 1440 bps in BPSK mode or at 2880 bps in QPSK mode. The modems used are AT-3004D or the newer AT-3104. It has replaced the unsecure Yakhta Voice Scrambling System (modem T-219 or its successors AT-3001M/AT-3002M.).

Quite often a HQ practises all possible tasks with the same station - namely messages in Duplex Morse traffic, MS-5 traffic and phone patches or online encrypted Morse. This can last for hours if the operator is not skilled. When all messages start with "11111" we can assume it is for training.

In the first example RIW has been asked by RFH70 to allocate frequencies for MS-5 traffic. Normally RIW and the Fleet HQ are called on 8345 or 12464 kHz.

2. Sample Messages 1

Frequency kHz	Traffic	Comments
14556	RFH70 de RIW QYT4 QWH 9700/9700 = 12056/12056 QSX 8440/8440 =12414/12414 k	I will use MS-5. I will send on 9700, simultaneously on 12056. I will listen on 8440, simultaneously on 12414.
9700 and 8440	MS-5	Link is established
14556	RFH70 de RIW QYT4 QMO ok? k	Adjust your MS-5 system.
	RIW QLS ok? k	Use alternative frequency.

Russian ELINT ship project 1826 Belomor, one of the biggest ships for Electronic Surveillance of the Navy. In reserve, but still operational.	Nuclear Powered Submarine 671 RTM

2. Sample Message 2

RIW relays a message from RMP to RFE76:

Frequency kHz	Traffic	Comments
14556	RFE76 de RIW QTC 411 66 11 1607 411 = sml = fm RMP = (txt)	"sml" = priority code for "Samoljet".

2. Sample Message 3

Station RMZW has technical problems with voice communication in MS-5 mode and is going to test it with RIW. This happens quite often or a station does not hear well on the proposed frequency. In this case MS-5 may run for a long time in idling mode (instead of the 12 channels, many lines are visible in an audio spectrogram) until communication is resumed.

Frequency kHz	Traffic	Comments
11000	RMZW de RIW QSA4 QSA? QYT4 k	Your signal strength is good. How do you read me? I will use MS-5 mode.
12464	RIW de RMZW QSA2 QYT4 k	Your signal is weak. Ready for MS-5.
11000	RIW QYT4 QSX 12398 ok? k	RIW will listen on 12398 kHz for MS-5 tfc.
12464	RMZW ok QYT4 QSX 12398 k	RMZW agrees. QSX and QWH is mixed up, because he just repeats. The NCS doesn't care. Both know, what is meant.
11000	RIW QYT4 QCM k	RIW: Your transmission suffers from technical problems.