ICOM 4088SR (HM-75 Speaker Mic) Tuning Solution - Wildtalk

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Home > Knowledge Base > Programming Data Related Articles Still Can't Find The Answer? Email a Question Phone 01904 630686 Newsletter Sign Up Knowledge Base Answers to Your Questions about Radio and Wireless Voice Communications ICOM 4088SR (HM-75 Speaker Mic) Tuning Solution 01 January 1970

Refer to 4088 SR Service manual for more tuning detail in conjunction with Tuning box.

To make Tuning box, attach the following resistors to RING of 3.5mm jack and ground via switches:

3.5k = 'B' Key in manual (Change Tuning Item)

7k = 'A' Key in manual (Lock in Tuning)

12k = 'Up' In Manual (use to change Tuning Item VALUE/Select channel to tune)

24k = 'Down' In Manual (use to change Tuning Item VALUE/Select channel to tune)

To set radio into tuning mode, open radio and connect 'Test' pad to ground, then power up.

Make sure that you press the 'A' key/switch to lock in tuning once finished.

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