ZETRON 2000 Series Specifications download pdf (Page 108)

Radio System

108 025-9035AA

For a Zetron 2100 or 2200 co-located with the transmitter at the RF site, you can perform

all of the adjustments yourself.

♦ Adjusting a co-located transmitter

1. Tune your communications monitor to the desired paging frequency, and page a 2-

tone or 5/6-tone tone & voice pager.

2. During the voice time, adjust the XMIT AUDIO to 3.5 kHz to 4.2 kHz RF

deviation.

3. During the paging tones adjust the XMIT TONE level to obtain 3.5 kHz to 4.0

kHz channel deviation.

4. Page a POCSAG or GSC binary digital pager.

5. During the signaling time, adjust the transmitter digital deviation to 4.5kHz to

5.0kHz.

6. Try some pagers with a variety of paging tones; from 500 Hz to 2500 Hz. Make

sure that your transmitter deviation is NOT dependent upon the paging tone

frequencies. If it is, the pagers will not reliably decode, and the voice messages

will sometimes sound distorted. (See Jumper Settings for ways to make the audio

“flat”).

For a remote transmitter site, it helps to have two people, one at each location. The person

at the transmitter site would normally have the communications monitor. You will need to

adjust the levels sent through the control link as well as the RF deviation levels.

♦ Adjusting a remote transmitter

1. Using an AC-VRMS voltmeter or oscilloscope at the transmitter site, measure the

link audio level being received at the transmitter control shelf equipment.

2. Page a tone & voice pager and adjust the XMIT TONE and XMIT AUDIO levels

so that the link levels are in the range required by the link control equipment.

3. Page a digital pager and make sure that the link modem tones are at the desired

level.

4. Finally, adjust the RF transmitter tone deviation to +3.5kHz and digital deviation

to +/-4.5kHz.

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ZETRON 2000 Series Specifications Page 108