Frequently Asked Questions
Why can't I use my filters with the HRD Digital Modes?
Last Updated 2 years ago
All the data modes in DM-780 are AFSK with the exception of CW and RTTY FSK. A disadvantage of using AFSK is that most transceivers will not allow you to use the narrow IF filters in your radio when operating in the LSB or USB positions. Some recently manufactured radios allow you to change the characteristics of your IF filters so you can effectively receive the digital modes in the SSB position. This is the reason many avid RTTY operators would rather use RTTY FSK, as opposed to RTTY AFSK, since FSK allows for the use of all the filters and goodies built into their radios.