AValon RF TX618M - Manual (Page 5)

AVALON RF, INC. Page 3
TX418M/TX518M/TX618M User’s Guide & Operating Manual
1.1 Video.
The video input is buffered, combined with the two audio subcarriers,
then DC level restored, limited by a white level clipping circuit, pre-
emphasized and (VSB on TX418M series) (FM onTX518M/TX618M
series) modulated onto the transmitter RF carrier.
Avalon RF offers the following video indices of modulation
(TX518M/TX618M only):
• Industry standard frequency deviation of 4MHz.
This option offers longer range at reference quality.
• Wide frequency deviation of 6MHz.
This option offers broadcast quality but with shorter range.
1.2 Audio.
The two audio inputs are buffered and FM modulated on two
subcarriers. The factory preset subcarrier frequency is 6.0MHz and
6.5MHz but may be factory programmed to any frequency from
4.8MHz to 7.5MHz.
1.3 RF Output.
The TX618M has a single MMCX RF output with a 50
Ω
(ohm)
impedance.