2 HSI's with 1 gyro/fluxgate?

[Dico]

Hello,

Our panel has a King HSI in it aswell as a 2nd ILS/GS indicator. If we
put in a 2nd HSI or EHSI, can they both run off one gyro/fluxgate? Or
do we need a gyro/fluxgate for each?

-dr

[karl gruber]

I have an HSI and an indicator running off one gyro, so...yes...one gyro can
run both.

Karl
ATP CFI ETC
"Curator" N185KG


"Dico" > wrote in message
ups.com...
> Hello,
>
> Our panel has a King HSI in it aswell as a 2nd ILS/GS indicator. If we
> put in a 2nd HSI or EHSI, can they both run off one gyro/fluxgate? Or
> do we need a gyro/fluxgate for each?
>
> -dr
>

[tom418]

FWIW:

On a B727, there is a provision for switching Captain's or F/O's RMI to the
"other pilot's" compass system. One would select "Both on Comp1" or "Both on
Comp2"

So, it seems that you can drive 2 RMI's or whatever off one fluxgate.
"Dico" > wrote in message
ups.com...
> Hello,
>
> Our panel has a King HSI in it aswell as a 2nd ILS/GS indicator. If we
> put in a 2nd HSI or EHSI, can they both run off one gyro/fluxgate? Or
> do we need a gyro/fluxgate for each?
>
> -dr
>

[Prime]

"Dico" > posted the exciting message
ups.com:

> Hello,
>
> Our panel has a King HSI in it aswell as a 2nd ILS/GS indicator. If we
> put in a 2nd HSI or EHSI, can they both run off one gyro/fluxgate? Or
> do we need a gyro/fluxgate for each?
>
> -dr
>
>

You need another flux capacitor along with a Mr. Fusion for the correct
power levels.

[Dico]

Perfect.... thanks for your help everyone!

[jmk]

Dico wrote:
> Perfect.... thanks for your help everyone!

Actually, I *think* the answer is no. I don't have the books in front
of me, but the HSI (actually, the circuit card in the gyro) generates
the excitation signal to the fluxgate. Since the response is only a
phase issue with respect to the excitation signal, I don't see how you
could couple it to two HSI's. [Actually, since it is only used to
maintain alignment over the long-term, I guess you could rig a switch
that hooked the flux gate to one HSI for a few minutes, then the other,
then back again. Not very elegant.]

Now all this is for the old King KCS-55 system. There may be something
newer available.