Someone pointed me to some KX-170B's and MAC1700's listed on eBay. My
existing MX-170B (TKM) also has a glideslope which I occasionally
remember to tune in as a backup to my real glideslope. If I buy a used
170B or MAC1700 how will that effect the backup GS? Is the GS
functionality built into the head, or the radio itself??

Thanks!

-Robert