In fldigi, make sure that the tuned frequency in the upper left-hand corner is the same as your radio's frequency. To change it, click on the top half of a digit to increase it or the bottom half to decrease it. Look for the 1000 Hz line on fldigi's waterfall. Click the cursor there or use the offset frequency box at the bottom of fldigi's screen.
Hamlib Setup ... Hamlib Setup
The Fldigi software is written in highly portable C/C++ and can be used on many CPU architectures, including: amd64; i386; armhf/armel; ia64; mips; mipsel; powerpc; s390; s390x; sparc; Raspberry Pi. Sound systems. Multiple sound systems are supported by Fldigi, allowing the program to abstract the Sound card hardware across differing hardware and operating systems.
Providing several frequencies within the 70cm band is certainly an option - I put that on my to do list. Re the type of signal: this uses LoRa, which is a low power spread spectrum modulation, mainly used for Intern of Things applications.
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PSK31 HF Frequencies: PSK31 VHF Frequencies: Band: Frequency: Band: Frequency: 160 meters: 1.838.150 MHz: 6 meters: 50.290 MHz