Welcome to CQ-UK

Connecting the World to your Radio....

Mission Statement

The CQ-UK Room on the internet, exists to create a place to get help or chat about any subject that you or others, find interesting... 

The links that we are providing (now and in the future) are for the benefit of all who use the room. The reason for these links to FM,  C4FM, DMR and D-STAR allows all modes to be able communicate with  the other in one place regardless of Repeater access or equipment owned..

Thanks to the hard work of MI5DAW Rickie, GM7KBK  Ernie DMR C4FM and Dstar can now communicate together thru the CQ-UK room 

We have a duty in Amateur radio to experiment with new  idea's, technologies and to think outside the box, if it doesn't work we won't class it as a failure, but instead treat it as just another way not to do it.

The only real failure in life, is if we don't try.


D-Star was developed in Japan 1999/2000 especially for ham radio and it became the leading system worldwide due to its clear and relative simple user interface. Voice is being transformed by the AMBE Vocoder into a compressed digital data stream of 3600 bits/s. In addition there is a data channel with 1200 bits/s for a total data rate of 4800 bits/s. This data signal modulates a carrier, so that a logical 0 is one frequency and a logical 1 a second frequency. This is called 2FSK (two frequency shift keying) or GMSK (which is the same, however the signal is modulated using a bell curve). This signal can be used to modulate most FM transceivers (via the packet radio socket). This is the reason why there are many home made D-Star solutions. Three reflector systems are used for communication. DCS (most common), D-Plus, REF reflectors (mostly in English speaking countries), and the x-Reflector system which plays a minor role. DV4mini enables communication on all these systems. 

DMR: DMR was originally designed by ETSI for commercial applications. This is evident in the user interface where numbers are used in lieu of call signs. DMR modulates with 4FSK, indicating that it uses 4 frequencies (compared to D-Star with 2 frequencies). This allows to double the data rate to 9600 bit/s. The higher rate allows the transmission of 2 channels at the same time (2 time slots). The DV4mini always works in simplex mode in DMR. If you use time slot one (TS1) you have to set your radio to color code 1 (CC1) and the talkgroup you want to use, i.e TG311 or TG262 etc. Be aware that you have to enter the talkgroup number into the receive group list of your radio too, or your squelch will not open. This is a common error made by first time users and it is very frustrating. ­ 

CFM­Fusion: C4FM-FUsion is a system developed by YAESU. It is based like DMR on 4FSK, and also transmits 4 frequencies with a total data rate of 9600 bits/s. It uses the same AMBE+ Codec as DMR, but needs only 3600 bits/s. The extra bits are used in C4FM-Fusion in a different way. They can be used for data transfer (e.g. GPS) but also for additional error correction to make the speech more stable during interference. There is also a mode for high speech quality which uses all bits for speech only. 

Our C4FM -Fusion reflector is named CQ-UK and has a dtmf node id of (27793)

InJanuary 2017 the CQ-UK room and this website was created to provide a practical solution for all C4FM users, to gather information on how the system worked, get advice, help or just chat. In the last year we have created links for Dongles, DMR , C4FM,  & Analogue, This year we have completed a D-Star link... Our primary goal is still, to help fellow amateurs see just how well Yaesu system fusion (YSF) & c4fm works and its ability too bring us all together and share the vast amount of knowledge that exists in the amateur community on many subjects from Meteor scatter to building kits....

Not everyone will agree we our aims, or the way we do things, and at times it can be quite challenging.. But we will always be testing new ideas, and trying to make changes that will make the system better and more enjoyable for all, this will continue in the foreseeable future, If you feel this is not for you please feel free to move rooms at times of testing, and return at a later date if you wish, when we have completed the work.....

THE CQ-UK ROOM will always remain open and free for all regardless of modes...

BEST 73's