Using an all band(HF/VHF/UHF) Radio such as IC-9100 which is capable of doing FM modulation and demodulation, can I transmit and receive FSK data?
Dear Bhagath,
Yes you can use analog fm transceivers to implement the FSK digital binary modulation and demodulation since simply the digital FSK is a special case of the analog fm where the modulating signal will be in a binary form having only two possible amplitudes say +V and - V.One gets two fm symbols; one for the mark with frequency fmark, and the other for the space with frequency fspace..
But you have to take care of the achievable parameters of the FSK. The fm broadcast system has a bandwidth B= 200 KHz. This bandwidth is related to the input bit rate fb and the frequency deviation df by the Carsons rule, B= 2( df +fb/2)
For efficient bandwidth utilization it is required that df=fb/2 which means that the modulation index mf=1. Therefore, the highest data rate will be 100 KHz with df= 100KHz too.
Since the FSK is a special case pf analog fm, the devices used for the fm can be used also for the FSK.
Generally you will need to take care:
on the transmission side for phase disruptions which would increase your OOB levels. If your modulator provides for continuous phase output then this is not a problem;
on the reception side for low SNR cases to discriminate between 1 and 0.
As for IC-9100, it has dedicated RTTY mode, if I'm not mistaken. Please refer to the operation manual.
it depends upon behavior of the transmitting and receiving antennas you are using in your applications. If your antenna is capable of having frequency characteristics matching to FSK modulated signal then you can use for transmission and reception.
Then you are supposed to use proposer demodulation techniques for FSK modulated signal.
yes, the operation mode is USB, LSB, CW, RTTY(FSK), FM, AM*4, DV(with UT-121)
Hello: That radio has that function. You must connect the radio to the computer through the USB cable. I would recommend that you use additional software on your computer to better use the FSK modulation. In the link it shows you a video (it is for the ICOM 7300 model) but it is similar for the ICOM 9100.
https://www.youtube.com/watch?v=ZCkiuzAMuZI
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