Wondering if the TA4 Transceive Adaptor and SPR4 receiver can be used with the T4XC?? My SPR4 manual talks about the TA4 and the SPR4 working with the T4/T4X/T4XB transmitters but nothing about the T4XC. Could this be due to the SPR4 predating the T4XC??? Thanks for any info. 73, Joe W2KJ