Although Olivia isn’t too badly affected by less than optimal linearity, I have seen signals clearly overwhelming the transmitter. When transmitting, you need to ensure that you are not sending a distorted signal from your computer to the radio and that you are not overloading your transmitter with your audio signal. Your choice of software and the way you adjust it can make the difference in your ability to put out a good signal that can still be decoded in challenging conditions, and in your ability to receive signals deep in the noise or amid interference. Broadly speaking, narrowband combinations such as 8/250 are the ones that can be decoded when the signal is very low, say down to about -13dB s/n, at the cost of speed wideband combinations such as 32/1000 are somewhat less resilient in weak signal conditions but are faster and can be incredibly robust in the presence of narrowband interference.īelow is a surely incomplete list of issues and tips that will help Olivia users to increase their chances of success. The most common combinations you find these days (October 2020) are 8/250, 16/500, 32/1000. Olivia users can also be heard talking (or chatting) about “ghost signals”, so what is this all about and how can it be achieved?įor those who are not familiar with Olivia MFSK, commonly referred to as Olivia, this digital mode comes in various combinations of bandwidth and number of tones. However, seasoned Olivia users know that it is possible to extract legible text in almost impossible conditions, when the other station’s signal is buried under broadband radar interference or amid strong RTTY signals during contests. I have also seen users struggling to squeeze performance out of Olivia or receive signals in the most challenging conditions. After a few years of Olivia MFSK regular use, I observed a fair number of stations who are unable to transmit good and clean signals.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |