page 2 – 3
AM-10HD / Aug 2008
F E A T U R E S A N D P R E S E T S
Easy Steps to Success
1. Install the AM‑10HD GUI on a host PC. This will allow you to control the
various setup options required for successful installation. The factory default
IP address of the AM‑10HD is 192.168.1.211. Refer to the Network Installation
section for detailed information on reconfiguring the AM‑10HD IP address.
2. Install the AM‑10HD in the transmitter site’s equipment rack using at least two
rack screws. If only two screws are used they must be installed in the bottom
holes of the rack ears to prevent undue stress on the front panel and possible
bending.
3. Connect local AC power to the unit. There is no power switch and power is ap‑
plied to the unit as soon as you connect it to a suitable source of AC power. The
power supply is universal and accepts line voltages from 90VAC to 260VAC,
50 or 60Hz.
4. Connect the Analog or Digital audio inputs as appropriate for your installation.
5. Start the AM‑10HD GUI on the host PC and then configure a device if you
haven’t done so already (see page 2‑8), and then connect to the unit.
6. Click on the Input Menu tab in the GUI and select the input source to match
the Input type you connected to the rear panel. If your audio source is already
providing an audio feed, you should see meter activity on the AM‑10HD front
panel Input and Output meters.
7. While still in the Input menu and observing the Input meters within the GUI or
on the front panel, adjust the Input Gain control (AES or Analog as required)
until the input meters are peaking around ‑12dBFS with normal program levels
being applied.
Note that for best overall performance of the entire audio chain as a “sys‑
tem” the Input gain of the AM‑10HD should be calibrated so that it reaches
0dBFS when the signal chain prior to the AM‑10HD also reaches 0dBFS,
or digital full scale.
Note also that when the AM‑10HD’s AES Input gain control is set to
“0.0dB” a ‑12dBFS signal applied to the AM‑10HD will also cause an
internal signal level of ‑12dBFS. By implication this implies that when the
external audio path has reached 0dBFS (full scale) the AM‑10HD will also
reach 0dBFS (full scale) and at that point the audio chain is “out of bits.”
8. Make the audio output connections that are appropriate for your installation.
9. For the analog transmitter outputs navigate to the AM TX menu and select
the operating mode that matches your installation. When the “Mono” mode
is selected there are two analog output level controls available – one for TX1
and one for TX2. In most installations the TX1 and TX2 analog outputs will
connect to main and backup transmitters respectively, and the TX1 and TX2
output level controls are used to set modulation for each transmitter.
Note that next to each output level control there is a polarity symbol labeled
“Phase.” These check boxes allow you to invert the phase of one or both
outputs to match the polarity requirements of the connected transmitter(s).
If you see increased negative modulation when advancing the Positive
Modulation control, the output phase for that transmitter should be reversed.
