** One thing to try out if you are trying to copy 110a broadcasts for Ft. Huachuca; set your carrier freq in the modem tool for 1500 Hz and offset your rx freq on receiver by 300 Hz (i.e. 4000.3 kHz instead of 4000.0). You can use your RIT if desired. This should put more of the envelope of the 110a transmission within the band pass of amateur service receivers. They have been broadcasting 110a 3 times in succession, so if you get successful on the first transmission, it might be a good experiment to go back to "normal" (1800 Hz, no offset) to check if for any difference in copying the broadcast.

Audio bandwidth study by AAR3CB using the Spectrum Analysis tool by W.A. Steer
(Download Here)

Click here for a simple signal generator to test freq response on transmitters (from the same author)

I used this tool to plot transmitted output vs. audio frequency using a Kenwood TS-940 in SSB mode

Click here for the graph

AAR3AN 110a (Flex Radio w/transmit bandwidth set to 2.7 kHz)

A typical SSB voice input

3DL transmission w/steep cut off ~2.7kHz (but still printable by most of the net) "Hump" likely due to selective fading.