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These units are essentially 1:1 transformers wired to present an unbalanced pin configuration at one end and a balanced pin configuration at the other. In general they are symmetrical and can be used either way round; however, in certain circumstances they may not be suitable for connection to outputs of units. They utilise a miniature Lundahl transformer and can be used with signals up to +18dBu.
If it is required to feed 600 ohm land lines or other low impedance loads these units are not suitable for that application, see Line Isolating Units, stock code 49-243.
1. Pin wiring at the unbalanced end of XLRs has pin 2 hot in accordance with European standard, pins 1 and 3 are linked and therefore great care should be exercised in case the user encounters any old type equipment (mainly American) with a pin 3 hot wiring convention. Damage could result.
2. On types PHMXFH and PHMXMH, the phono male connector is not on the converter body, as the weight of the combined adapter and connected cable may seriously stress a panel mounted phono female. On these two types the phono male is connected via 250mm of cable.
3. On types MJPXFH and MJPXMH, a 3.5mm 3-pole locking jack plug (43-251) is used, connected via 250mm of cable. This mates with both normal and screwlock sockets. The signal is connected to the tip, and the ground to the sleeve; the ring is not connected (although users who require this can modify the connector wiring)
4. On types BNCMXFH and BNCMXMH, the BNC male connector is not on the converter body, as the weight of the combined adapter and connected cable may seriously stress a panel mounted BNC female. On these two types the BNC male is connected via 250mm of cable. These types are particularly suitable for interfacing balanced timecode lines to unbalanced machine inputs and outputs.
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