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APPENDIX
Read before attempting to connect your filter.
Wiring information for your Timewave Audio Noise Reduction Filter model DSP-59+
This information is to help you determine which connectors you need for your receiver or transceiver.
Connector requirements vary widely. Check your radio owner’s manual for exact details.
DSP-59+ Inputs and Outputs
The DSP-59+ uses 4 RCA phono jacks on the back of the filter for audio input, audio output, PTTI
switch, and line output. Use cables with RCA phono plugs on one end to connect to the DSP-59+. The
connectors on the other end of the cables are determined by the other devices.
Transceiver Speaker Output
Most receivers and transceivers use a 1/8” mono phone jack for the speaker output. Use a cable with a
1/8” mono phone plug. The other connector is determined by the external speaker input. The most
common external speaker connectors are a RCA phono jack, a 1/8” phone plug, or bare tinned wires.
Multimode Data Converter and Terminal Units (TU)
Data devices use a wide variety of connectors including phone jacks, RCA phono connectors, DIN
connectors, D-subminiature, screw terminals and others. Consult your owner’s manual.
Transceiver PTT and T-R Outputs
Transceiver PTT and T-R outputs use a wide variety of connectors including phone jacks, RCA phono
connectors, DIN connectors, screw terminals and others. Consult your owner’s manual.
Figure 1 shows a RCA phono plug and Figure 2 shows a 1/8” mono plug.
The list of pre-made cables are from the Radio Shack Store.
1. Part #42-2444 - 1/8” phone plug to RCA phono plug (DSP-59+ audio input to transceiver speaker
output).
2. Part #42-2370 - phono plug to split bare tinned wire (DSP-59+ speaker output to external speaker,
or DSP-59+ PTTI from a transceiver PTT output connector).
3. Part #42-2366 is a RCA phono plug to RCA phono plug.
4. Part #42-2459 Add-on volume control for lightweight stereo headset cord with a stereo 1/8” plug.
Figure 1 Figure 2
For more information see your ARRL Handbook on connectors.
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