From the MFJ 1708SDR switch manual…

TECHNICAL ASSISTANCE

If you have any problem with this unit first check the appropriate section of this

manual. If the manual does not reference your problem or your problem is not

solved by reading the manual you may call MFJ Technical Service at 662-323-

0549 or the MFJ Factory at 662-323-5869. You will be best helped if you have

your unit, manual and all information on your station handy so you can answer

any questions the technicians may ask.

You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial

Park Road, Starkville, MS 39759; by Facsimile to 662-323-6551; or by email to

techinfo@.... Send a complete description of your problem, an

explanation of exactly how you are using your unit, and a complete description

of your station.

The switch can use RF sensing to toggle the switch but you may want to use the IC-7000’s rear panel external PTT output like used with a linear amplifier instead. That will usually switch before RF is present and will protect the SDR better.

Perry K4PWO