Look for one specified as and AES/EBU to RCA adapter.
6 responses Add your response
Yes, something like this SPDIF to AES/EBU converter, costing $90, is probably the best way to go:
However, if your Fostex is a CR500 or similar model, it claims to be able to auto-sense whether its input is SPDIF or AES/EBU. SPDIF (which is what is most commonly transmitted via 75 ohm coaxial cable terminated with rca connectors), and AES/EBU (which is usually transmitted via 110 ohm twisted pair cable terminated with xlr connectors) differ in terms of both impedance level and voltage levels.
I don't know whether or not the Fostex, when it senses SPDIF, will adjust its impedance level to 75 ohms. If it does, you may be able to get away with a simple rca-to-xlr adapter such as those you referred to. Especially considering that you are not going into a dac, which makes jitter less of a concern. If the Fostex presents a 110 ohm input impedance regardless of the signal type coming into it, then you almost definitely need a format converter such as the one I linked to.
Should never convert digital transmission XLR TO RCA or RCA to XLR.
The digital cable is high speed transmission and has shield connection on both ends designed to help build RF/EMI.
You can however use this application in a analog stage,because a properly design analog is only shielded at one end to ground were the other end is open and wrapped around the conductors.
Providing to you pay attention to the direction arrow on the cable and make your conversion at that end of the cable.
Hope this help clear some thoughts about this type of conversion.