Localizer work?

[siucavflight]

I was wondering if anyone in here could help me to understand how a localizer signal works. I know that there are two signals sent out, one at 150hz and one at 90hz. My question is how do to two frequencies meet in the middle, is it come down to 120 hz in the middle, and if so how does this happen, do 150 and 90 hz only exist at the end of the localizer frequency and they 150 gradually decreases until it gets to 120 and 90 increases till it gets to 120?
The reason I ask is because one of the examiners excepts CFII candidates to know this stuff for the checkride, and I am having some trouble getting the student the information.

 

[minitour]

Your receiver senses how much 150 and how much 90 you're receiving and converts it into a needle indication. They don't go to 120 in the middle.

Getting more 150 than 90? The needle moves one way.
More 90 than 150? The needle moves the other way.

Didn't a king air go down a few years ago because of a Prop (RPM) setting screwing with the LOC or GS signal somewhere? Couldn't have been too long ago because I remember reading about it...

-mini

 

[User546]

Didn't a king air go down a few years ago because of a Prop (RPM) setting screwing with the LOC or GS signal somewhere? Couldn't have been too long ago because I remember reading about it...

We were having a discussion on here about it about 3 or 4 months ago after I had read a caution in my King Air manual about shooting an ILS with certain prop settings. Is that maybe what you remember? I don't know of a particular crash that was actually caused by it though.

 

[minitour]

Musta missed that thread.

I was having this discussion the other day with my roommate. We were discussing RPM/MP settings in the Duchess and I brought up the ILS thing.

I could have sworn it was a King Air that went down. I hope not, but I think I remember reading about it....back in the pre-instrument ticket days for me, so I would have read about it before August...sometime between March and August...

I dunno...

-mini

 

[wheelsup]

I think in the POH for the 200 it says avoid shooting an ILS with 1700-1900 RPM, but that's just going off the top of my head.

It's somewhere around that RPM, not sure about the exact number. Don't quote me on it .

~wheelsup

 

[minitour]

Don't quote me on it .

~wheelsup

oh I am...now you've done it...I'm gonna tell all my buddies not to fly approaches with 1700-1900RPM...oh yeah..

I'm just screwin witcha

 

[siucavflight]

This conversation is not really helping me.


If you like I could start a thread about King air and prop settings.

 

[minitour]

This conversation is not really helping me.


If you like I could start a thread about King air and prop settings.

Uh....I tried explaining it in my first post. Sorry if that isn't good enough.

-mini

 

[User546]

http://forums.flightinfo.com/showthread.php?p=546331

sicavflight has created another thread for us to discuss the whole "Localizer / Prop Setting / Interference Issue."

If you still want to continue that particular conversation, lets do it there!

 

[Kream926]

sorry

so ahens tha new wonka movie coming out?