DATA TRANSMISSION INVESTIGATION
Abstract
The characteristics of the AN/VRC-12 are discussed and the field test system for digital data transmission using the AN/VRC-12 is presented. Seven fixed transmission sites were used for transmission points to the laboratory where the analysis of the data was conducted. Map profiles of these sites are given and the audio S/N and digital error rates measured over these transmission paths are presented. Error rates varied from 5 x 10 to the -6th power to 1 x 10 to the -3rd power depending upon the site and conditions. A table of average error rates shows that the error rate of a particular modem is almost independent of bit rate. Further analysis of the results show that single-bit errors, account for about 90% of the characters-in-error in the AN/TYC-1 and Di- phase modems for transmission at 600 bps or less and in these cases error correction codes would be very effective. The cause of the errors is found to be impulse noise and photographs of the noise plus the signal is presented for discussion. The new digital data test system is discussed with the aid of a system block diagram. Both a printed record and a punched tape record of the error characteristics is provided.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 10, 1963
- Accession Number
- AD0404376
Entities
People
- R. F. Salava
Organizations
- Motorola Mobility