Page 26 of 33 – S5 Wireless Microphone Installation Guide Rev 1.2
Antenna Head Amplifiers
Trantec head amplifiers are designed to reduce the effect of long RF antenna
cable runs between the receivers or ADUs and remote antennae. The S/ADU
and S5 Series Receiver can supply power to the head amplifier.
Please note: head amplifiers can introduce some unwanted effects, such as
RF blocking and increased intermodulation, especially in multi-channel
applications. To minimise such effects Trantec offers the following guidelines:
1. For cable runs of greater than 10 M and less than 20 M, when using RG58
cable, insert a head amplifier (attenuation @ 830 MHz is approx 5 dB per
10 M).
2. For cable runs of greater than 20 M and less than 40 M, when using
RG213 cable, insert a head amplifier (attenuation @ 830 MHz is approx
2.5 dB per 10 M). 40 M is the recommended maximum length of cable run.
3. Ensure that transmitters are always at least 3 M from the remote receiver
antennae at any time.
4. Always test the installation without the use of head amplifiers first. Only
insert these if the range is found to be inadequate and below normal
operating range.
5. Always ensure that the overall system RF gain does not exceed 6 dB.
6. Always insert head amplifiers at the remote antenna end of the installation.
7. The antenna head amplifier is NOT designed for outdoor installation and
should not be operated in damp conditions.
