User's Manual

PINEAPPLE TECHNOLOGY, INC. V.3. DXDPRO-10U APPLICATIONS AND INSTALLATION

DXDPRO-10U MODULATOR MANUAL

THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND

CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION

V.3 DXDPRO-10U APPLICATIONS AND INSTALLATION (Continued)

C. DIGITAL UPGRADE NOTES

The DXDPRO-10U is suitable for upgrading analog transmitters to digital service. Special attention must be

given to every detail of the conversion to insure that the desired objective is met and that it is compliant with

FCC requirements. The equipment used to make a conversion is expensive and can be costly. The

following needs to be considered when making a conversion to digital from analog;

1. Replace the modulator with a good quality digital modulator with adaptive linear and non-linear

correction

2. Check the drive level required to achieve the desired output power level from the transmitter. A

driver may be required after the modulator

3. The output band pass filter will have to be replaced with a MASK FILTER. Consider using a mask

filter that is rated at 1.25 times the desired output power level.

4. Digital transmitters and mask filters need to be correctable by the modulator. This will require the

addition of dual directional couplers before and after the mask filter to provide correction signals.

5. IMPORTANT: Modification of FCC approved equipment requires special test and test equipment. A

qualified Broadcast engineer should be employed to do this work.

D. 48 VDC OPERATIONS

The DXDPRO-10U modulator is designed to be used with an external 48 VDC supply similar to those found

at telecom sites. If the Modulator is used with standard AC supplied power sources the DC backup can be

automatically switched with internal circuits. The battery charge level can be monitored on the front panel

or on the web page. The operating range is from 42 to 52 VDC.

E. GPS RECEIVER ACTIVATION

The DXDPRO-10U has a built in GPS receiver. The input port is located as show below;

GPS Receiver

Input

Connection