On Sep 19, 5:33 pm, mikem wrote:
On Sep 19, 9:27 am, Newps wrote:

... The LOC freq that gave me trouble was 111.5.

This is a common problem with the 12D. see this previous post:http://tinyurl.com/342cbu

Follow up: In the old thread, Fong posted that the LO injection on the
12D is low-side, and the first IF is 17MHz. That puts the LO at
115.5-17=98.5. The sixteenth harmonic of 98.5 is 1576MHz, which
apparently blocks the GPS.