Outboard Audio Chain

Outboard Audio Processing

Whilst not in pursuit of ESSB, I am trying to maximise my 3Khz transmit bandwidth with audio processing. I have chosen equipment based on performance as well as keeping the item count down to minimise the potential for RF pick-up into the audio. Starting with the Aphex Channel, which is widely regarded in the studio arena for vocal audio processing, using the Aphex patented Aural Exciter and Big Bottom. Additionally, the tube Pre-amp provides a good base for the Rode Procaster Dynamic Microphone.

A Behringer QX1002USB Mixer provides level control and the ability to add effects to the audio stream, having Klark Teknik Multi-FX Processor on-board and a manual 3 band EQ for audio tailoring of other audio sources.

Microphones

Rode Procaster Dynamic Microphone is the main microphone, set on a Blue Compass Boom Arm..

Additionally, an Audio-Technica BPHS-1, Dynamic Headset is used for contesting, passed through a channel on the Mixer and EQ'd for more suitable frequencies.

Finally, an Audio-Technica AT804 Dynamic Hand Microphone is used as an alternative Dynamic Mic. The Curves below compare the two.

A dedicated Radio Microphone, the MD200A8X is a Yaesu developed mic with the VSPC insert and a Heil DX Dream Machine (HC-4) insert, which is switchable, purchased in 2008.

For receive audio, a set of JBL Control 2P Active Studio Monitors, as recommended by Bob Heil are connected to a Moukey Powered 4-channel Mixer to enable audio from all Radios, terminating in a Nobsound Switch which has been modified with a tap to feed the Shack PC Line In for on-air recording. Recorded audio can be sent back over the air from the USB line in, into the mixer. An optional patch is provided to line-in for the Sonos System, for onward audio distribution.

Software for recording is Audacity, and for Real-time Audio Spectrum testing, Spectrum Lab. Pink Noise is generated from a smartphone !