[Collins] Little problem with s-line

[IK0JJZ]

Hello to all,
I have a problem with my S-line (32s-3 75s-3b 516f-2).
If I tune the vfo of 32S-3 and 75S3B on the same frequency by zero 
beating with "CW CAL", when I trasmit in CW I don't have the same 
frequency using "REC VFO" or "TRANS VFO" listening the emission in 
another receiver. (about 1KHc of difference)
Moreover I listen an annoying soft tone on the receiver when I use "REC 
VFO" only in CW mode, not in trasmission.
Thanks and sorry for my English

73 de Max  IK0JJZ