Mark, I'd say you are correct and got some amazingly bad advice.

Mark Hansen wrote:
While flying the ILS approach to runway 16R, I was to continue
straight out after a touch and go, so I planned to follow the
localizer. The D.E. with me said that I would have reverse sensing
while flying out the back course.

Nope.

What!?! That's not what I learned. While flying out, I noticed that
the needle displaced further while he was 'correcting' in what I
felt was the wrong direction. This seemed to make my point, but
he then said that I was getting 'correct' sensing due to the fact
that that particular runway has an ILS on both ends, both on the
same frequency.

OK, this gave me pause - I had never noticed that before. In looking
at the ILS 16R and ILS 34L approach charts, they both are on frequency
111.1 - although they have different Identifier codes.

How does this work? I thought the Localizer antennas operated in both
directions, ahead of the antenna and behind as well. When they both
use the same frequency, are they omni-directional?

They are on the same frequency because only one of them is in use and on the air at a given time,
based on which runway is active.

(But "omni-directional" means in all directions - the opposite of what I think you meant above. But no,
they are not uni-directional - this is just not an issue if only one is transmitting at a time.)


Assuming they are omni-directional, does that mean you will receive
both signals while overflying the runway?
You will be on the back course when overflying the runway, based on which ILS is active. You will get
normal sensing while flying out the back course, but would get reverse sensing if you were to turn
around in come back inbound on the back course. (unless you have an HSI, but that's another story.)


Given that the ILS for 34L was out of service, there is no doubt
that I should get normal sensing while flying out the back course,
however both my CFII and the Designated Examiner had this reversed.

How can a lowly student be correct and his CFII and Designated Examiner
be wrong?

Hang in there.They're only human, but I agree, they should understand this.

Mike