Holland Electronics HMMA Handleiding

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HMMA

Agile Modulator

The HMMA is a high quality SAW filtered frequency agile

modulator designed to meet high CATV performance

standards. The small sized modulator is 1 inch wide for easy

fit into 1 slot of the HMM Modular System. All channels,

CATV 2-135 and UHF 2-69 are selected with convenient

push-button switches. Low out of band noise levels allow

for use in adjacent channel head-ends. The simple operation

of this agile modulator makes the HMMA an excellent

choice where versatility, performance and small size are

required.

• Output Channels: 2 – 135 CATV, 2 –13 UHF and

14-69 UHF

• SAW Filtered

• 45 dBmV Output Level

• Low Out-of-Band Noise

• Easy to Read LED Channel Display

• Convenient Push Button Design

• Crystal Referenced PLL Tuning

HMMA SPECIFICATIONS

RFOutput Channels TV: VHF: 2-13; UHF 14-69

CATV: 2-135

Output Level 45 dBmV max

Output Impedence 75 ohms

Output Range 0 ~ -12 dB (adjustable)

A/V Ratio -10 ~ -30 dB

Frequency Stability ± 5 kHz

Aural Carrier Offset +4.500 ± .005 MHz

Spurious Outputs >-60dB

C/N (In-Channel) >60dB

Output Return Loss 7 dB typ

FCC Offsets +12.5 kHz

VIDEO

Input Level 1 Vp-p typ @mod:87.5%

Input Impedance 75 ohms

Input Level Range 0.5 ~ 1.5 Vp-p

AUDIO:

Input Level 0.5 Vp-p typ @ dev: ± 25 kHz

Input Impedance 5K ohms

Input Level Range 0.3 ~ 1.0 Vp-p

Pre-Emphasis 75 us

Installation Instructions:

1. Slide the model HMMA unit into the HMR rack.

2. Power up modulator by connecting the power from the HMPS power supply to the rear of

HMMA.

3. Connect a spectrum analyzer or field strength meter to the modulator RF OUT port.

4. Set the HMMA to the proper channel.

5. Turn the RF output adjustment on the front of the modulator to get desired output level.

6. Turn the A/V adjustment to set the audio carrier 12 to 17 dB below the video carrier

7. Remove analyzer or field strength meter from the modulator RF OUT port

8. Connect baseband audio and video signals to the AUDIO IN and VIDEO IN ports

respectively.

9. Connect modulator RF output to television/monitor. (Make sure to use the proper size

attenuator between the modulator and television so as not to overdrive the television)

10. Turn on television and set to modulator channel

11. Turn the AUDIO adjustment on the front of the modulator to set the sound on television

equal in volume to an off-air channel

12. Turn the VIDEO adjustment to set the video modulation:

Over-modulation causes buzzing sounds, overly bright scenes, and distorted pictures.

Under-modulation results in pictures with dull white levels and dark colors.

13. Remove television/monitor and attenuator from the modulator RF OUT port

14. Connect modulator RF OUT port to the RF input of the head-end system.

Product specificaties