MT63 is a digital radio modulation mode for transmission in high-noise situations. It was developed by Pawel Jalocha, call sign SP9VRC, primarily for keyboard-to-keyboard conversations on HF amateur radio bands.

The MT63 specifications require a precision of +/- 0.01 % for the sampling frequency. However Windows MT63 softwares accept +/-0.5 % offset and many sound cards have an offset of up to 0,7 % or even more for the nominal sampling frequency of 8000 samples/second, which does not allow the decoding of MT63 (as the offset of RX and TX can reach 1,4 %).

2021年11月25日 · MT63 is an Orthogonal Frequency Division Multiplexed (OFDM) digital data mode aimed for use in high noise environments. MT63 was developed by Paweł Jałocha SP9VRC. MT63 is designed for keyboard-to-keyboard conversation modes on HF amateur radio bands. MT63 distributes the encoding of each character over a …

The MT-63 modem, constructed around a high speed DSP processor, either in a dedicated external DSP unit like the Motorola EVM, or in PC software using the PC sound card, transmits 64 tones spaced 15.625 Hz apart, in the 1 kHz bandwidth. The base-band signal occupies from 500 Hz …

There is a lot of discrepancy as to what frequencies are recommended vs. desirable for use on the digital modes. Other modes like MT63 are even more confusing because of their robust flexibility - interleave and width for example. One person's favorite may or may not be another's favored digital mode frequency.

2000年4月2日 · MT63 is an Orthogonal Frequency Division Multiplexed mode consisting of 64 parallel carriers each carrying part of the transmitted signal. The tones are differential BPSK modulated. MT63 employs a unique highly redundant Forward Error Correction system which contributes to it robustness in the face of interference and facing.

It was developed by Pawel Jalocha, SP9VRC. It is intended as a conversational mode between two or more Hams. It has 64 tones spaced 15.625Hz apart, in the 1kHz bandwidth. It uses FEC error correction which, even if 25% of the character sent is obliterated, it will give perfect copy.

The MT63 specifications require a precision of +/- 0.01 % for the sampling frequency. However Windows MT63 softwares accept +/-0.5 % offset and many sound cards have an offset of up to 0,7 % or even more for the nominal sampling frequency of 8000 samples/second, which does not allow the decoding of MT63 (as the offset of RX and TX can reach 1,4 %).

MT63 is an Orthogonal Frequency Division Multiplexed (OFDM) mode consisting of 64 parallel carriers each carrying part of the transmitted signal. MT63 is designed for keyboard-to-keyboard conversation modes on high frequency (HF) amateur radio bands.

MT63 sounds like an uninterrupted roaring noise, the waterfall looks like a full, not modulated signal. Performs when conditions are weak and unstable, fading and there is QRM Immune to interference and deliberate jamming