Today's Message Index:
----------------------
1. 04:15 AM - Fw: vexing comm problem (John Rippengal)
2. 03:10 PM - Re: KX-155 & transmit interlock (Mike)
Message 1
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| Subject: | vexing comm problem |
--> Avionics-List message posted by: "John Rippengal" <j.rippengal@cytanet.com.cy>
> If you mount the antenna in that position then you are really just asking
> for trouble. The pick up from the transmission will be several volts of RF
> and with any minor non-linearity (eg a transistor, diode or even a switch
> contact) rectification can take place. This can feed into the audio ccts
or
> even the PTT and cause feedback howls or the low frequency 'machine gun '
> effect.
> The proper solution is to remove the antenna to for example near the tail
or
> in the tail. You will get better communications and less feedback. You can
> also fiddle about with ferrites on the audio wiring including headsets
cable
> etc and you might cure it. But it's like complaining that your ice cream
> melts in a furnace.
> John Rippengal
>
>
> From: <bakerocb@cox.net>
>
> .....................................
>
> >
> > 2) Engine run up complete, switch to tower (133.1), try to talk using
same
> arrangement as in 1). The result is a machine gun like sound when I key
the
> transmitter -- impossible to transmit coherently. (Rapid intermittent
making
> and breaking of ground contact for PTT?). Receiver works OK.
> ................................................................
> >
> > VHF comm antenna is a Bob Archer antenna mounted inside the fuselage
side
> aft of the copilot's seat.
> >
> > Any thoughts? Thanks for your help.
> >
> >
> > 'OC' Baker, Builder of KIS TR-1 #116 4/14/97 - 11/17/03
>
Message 2
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| Subject: | Re: KX-155 & transmit interlock |
--> Avionics-List message posted by: "Mike" <mike@ferrer-aviation.com>
I thought it had one but I can't find it on the wiring diagram either...
Mike
----- Original Message -----
From: "Jim S" <gjs55@yahoo.com>
Subject: Avionics-List: KX-155 & transmit interlock
> --> Avionics-List message posted by: Jim S <gjs55@yahoo.com>
>
> I am installing dual KX-155's and find no pin identified as a 'transmit
interlock' in the schematics. Am I missing something? I do see pin 14 on the
Garmin 430 schematic. Is this option available on the KX-155? Thanks.
>
> Jim
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