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AM-10HD / Aug 2008
A M - 1 0 H D G U I
The Round style creates both harmonic and intermodulation distortion with
the balance leaning more towards intermodulation. This is the warmest and
“thickest” sounding of the three clipper styles.
Note: Older transmitters may be “happier” using something other that the
“Hard” clip style. Because the clipping is less abrupt in “Firm” and “Round”
these styles stress the transmitter less, and this is particularly true for the pas‑
sive components in the transmitter’s output network and the antenna tuning
unit or phasing system.
AM Diversity Delay
The AM‑10HD contains an internal digital delay to compensate
for the corresponding delay in the HD Radio codec. The delay
section is capable of providing up to ten seconds* of compensat‑
ing delay in steps of 100 microseconds.
* Future software will enable Diversity Delay settings beyond ten seconds.
The Coarse
delay is set first to align the analog and HD signals as closely
as possible, and then the Fine delay control is used to trim the delay to pre‑
cisely compensate for that in the HD channel. Generally it is a good idea to
set the Fine delay to midrange before adjusting Coarse delay. Resolution of
the Coarse delay is 50 milliseconds.
The Fine control covers a range of 50 milliseconds in 0.1 millisecond
(100 microsecond) steps. If the Fine control does not set the increment exactly
to where it is desired, double clicking on the delay value text box will open it
for manual entry of the delay time.
When the Delay controls are both set to their minimum settings, “OFF”
appears in the delay window to signal that there is no delay at all in the circuit.
Entering Delay Values
You can double click on the delay value window to directly enter a numeric
delay value in
milliseconds
. This is useful when you know roughly how much
delay is required or wish to try various values quickly. You may also hold down
the
Shift
key on your keyboard while adjusting a delay slider to effect faster
adjustment rates, or hold down the
Ctrl key to achieve finer control.
