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THANKY YOU! re:Formation flight comm atte

 
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Fiveonepw(at)aol.com
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PostPosted: Wed Jan 04, 2006 7:58 pm    Post subject: THANKY YOU! re:Formation flight comm atte Reply with quote


In a message dated 01/04/2006 4:24:17 PM Central Standard Time,
nuckollsr(at)cox.net writes:
http://www.aeroelectric.com/articles/Attenuator
Quote:
>>

Another example of why I'm a confirmed Nuckollhead- dangle a real-world
problem in front of someone who doesn't have their nose in the flight levels or up
the exit end of their alimentary canal and voila': solution! Reminds me of
when Indiana Jones (first movie- the others REALLY stank!) is confronted in some
marketplace (Algiers?) by the black-robed ninja-type dude flingin' the blade
all over the place and Indy just pulls out his revolver and solves the
problem. Quick, simple, efficient.
Just to further my education- why the 50 ohms to gnd when switched on, and
what is rationale for the fancier switch than shown in the foto? Also- any
reason not to do a TPDT switch for an annunciator light?
Thanks AGAIN Bob for another great assist and for just doing what ya do!
Also appreciate the comments and suggestions from other A-listers in the
prosecution of this problem...
Quote:
From The PossumWorks in TN
Mark Phillips - RV-6A N51PW (no wallpaper but a journeyman certificate and 25

years herding robots, plcs, big automation systems etc.....)
do not archive


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brian-yak(at)lloyd.com
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PostPosted: Wed Jan 04, 2006 8:21 pm    Post subject: THANKY YOU! re:Formation flight comm atte Reply with quote


Fiveonepw(at)aol.com wrote:
Quote:
Just to further my education- why the 50 ohms to gnd when switched on,

Because that is what the transmitter wants to see. If the resistance
(impedance actually) is different from that by a factor of three or more
the transmitter could either be damaged or, if it has a protection
circuit, it could refuse to transmit.
Quote:
and what is rationale for the fancier switch than shown in the foto?

It would do a better job of presenting the aforementioned 50 ohm
impedance. Regardless, at the relatively low frequencies at which VHF
comms operate, Bob's wiring looks darned good and is unlikely to cause a
problem with your radio.
Quote:
Also- any reason not to do a TPDT switch for an annunciator light?

None at all.
--
Brian Lloyd 2243 Cattle Dr.
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery


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