Featuring a bright LCD display, new high-speed CPU and DSP processor,
pushbutton function selection, and continuous fine-tuning optical encoders,
the DSP-599zx offers unparalleled performance as well as field upgradability
for future features.


For voice and music, a continuously-adjustable optical encoder can be
tuned up to 5000 Hz. Lo/Hi pass voice filters from 200-5000 Hz or CW/data
filters from 10-600 Hz may be selected as well. Filter skirts are
razor-sharp without ringing.


The Data filters support RTTY, AMTOR, PACTOR, G-TOR, HF Packet, SSTV,
WEFAX, SITOR, and Clover. For transceiver use, the RTTY Remodulator mode
detects and regenerates the mark and space tones going to your Multi-Mode
Controller (KAM, PK-232, MFJ-1278, Etc.), giving it the benefits of a DSP
front-end. The RTTY Modem mode provides a complete RTTY Terminal Unit when
used in conjunction with a PC and appropriate software.


Additional functions include a manual notch tone eliminator, two-tone
audio sine-wave generator (20 Hz-10 kHz), true rms (peak, dBV, and dBm)
millivoltmeter (20 Hz-10 kHz, 1 mV sensitivity), and CTCSS ("PL") tone
encoder/decoder with squelch-switched output to activate a tape recorder or
other auxiliary device.

Please see link below:

http://cgi.ebay.com/ws/eBayISAPI.dll...ESSE%3AIT&rd=1