Noise from CAT input on revceive

Antony Watts

I have just connected up CAT & TX USB to my iMac, and am running Blackcat Systems SSTV app. Pictures are coming in fine on 14230kHz even among the wild SSB contest calls.

So I thought I would try to send something out too, so I configured the CAT for PTT to the USB port, and enabled RTS signalling. immediately the background "hiss' on receive rose by 1 S point. Why? Annoying.

Any ideas?

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