• AM Transmitter

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AM Transmitter site

1. AM Transmitter site
   1. Intro
   2. Location, phone, ISDN
   3. Contacts
   4. Block diagram
   5. Remote control
   6. Transmitter Log
   7. Troubleshooting
   8. Maintenance

Intro

The transmitter is a new, state-of-the-art, HD AM transmitter .

Location, phone, ISDN

On the grounds of Denver Drywall and of a tree nursery.

Phone: 303-789-2509

ISDN:

Denver: 303-789-5217, 303-789-5238

(For your reference, the numbers it calls in Boulder are 303-442-1908, 303-442-3937)

• Address:

3251 S. Zuni St.
Englewood, CO 80110-1965
map

As far as Xcel Energy is concerned, the address is actually: 3190 S Wyandot St

• There's a set of keys at KGNU: SecretInfo

• One key is for the street side gate (if after hours) and for the fence surrounding the site

• One key is for the transmitter shack

• Access is through the tree nursery (entrance on Zuni or, if open, north gate on Darmouth Ave)

• Access through Denver Drywall (entrance on Zuni)means having togo througha gated fence

• After-hours access is harder.

• DEADLY VOLTAGES ON TRANSMITTER TOWER: DO NOT APPROACH IT!

Contacts

• Mike Pappas, engineer 303-988-0976 (W), 1-800-351-1529 303-807-5619 (C) mpappas AT qwest DOT net

• Will Barnett

• Davide Andrea,engineer 303-413-1500 1davide at att dot net

Block diagram

 ISDN line --> AM transmitter --> Tuner --> AM tower --> AM receiver --> ISDN line
                            /\
                            ||
                            \/
 phone (303-789-2509) -->  Remote Control

Remote control

The transmitter is controlled remotely through any phone. You dial in touch-tone codes, and the controller responds with a synthetic voice (shown as 'response' below).

• Dial 303-789-2509

• 5 rings

• 'Please enter your password, followed by pound key.'

• Enter the access code: see the SecretInfo page

• Follow the voice commands

• To turn off the transmitter, for example as ordered by the FCC, do: 2 # 06 #

• Press 1 # to hear the status of some channel

  • 01 RF ON

  • 02 Exciter B on

  • 03 High power

  • 04 Low power

  • 05 RF Ready

  • 06 RF Alarm

  • 07 Shutback

  • 08 Cutback

  • 09 Interlock open

• Press 2 # to control the transmitter

  • 01 High Power

  • 02 Low Power

  • 03 Exciter HD Radio On

  • 04 Exciter HD Radio Off

  • 05 RF On

  • 06 RF Off

  • 07 Power increase

  • 08 Power decrease

  • 09 Transmitter reset

• Press 3 # to hear the analog reading of some channel

  • 01 AC volts (normal 110 to 120)

  • 02 Temperature

  • 03 Humidity

  • 04 Fan RPM

  • 05 Fwd power Percentage (need to be reset as it is really 100%)

  • 06 Fwd power kilowatts (need to be reset as it is really 5 KW)

  • 07 Reflected power kilowatts

• Press 5 # to disconnect

Transmitter Log

Troubleshooting

• Occasionally the ISDN link between the KGNU studios and the transmitter site goes down.

  • Go to the TeckRoom

  • Find the Master Control rack (first thing you see when you walk in)

  • Find the ZEPHYR unit for the AM (it has a sign saying "AM are we on the air?"

  • Press the Auto button twice in quick succession

Maintenance

• Always fill the Transmitter Log