Today's Message Index:
----------------------
1. 09:02 AM - Bendix-King edge card connectors? (Dave Durakovich)
2. 09:26 AM - Subject: Garmin 430 and King KX-155 frequency interferrence problem... (David Lloyd)
3. 11:06 AM - Re: Subject: Garmin 430 and King KX-155 frequency (John D. Heath)
4. 11:12 AM - Re: Bendix-King edge card connectors? (Doug McNutt)
5. 11:52 AM - Re: Subject: Garmin 430 and King KX-155 frequency interferrence problem... (David Lloyd)
6. 11:34 PM - Official Usage Guideline [Please Read] [Monthly Posting] (Matt Dralle)
Message 1
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| Subject: | Bendix-King edge card connectors? |
--> Avionics-List message posted by: Dave Durakovich <ddurakovich@yahoo.com>
Anyone have a name/specification/source/??? for the edge card connectors/replacement
contacts that BK uses on their various units?
Connectors as used on the KMA-24, KN-75, etc.
Any help would be appreciated.
Dave Durakovich
RV-4 in progress!
---------------------------------
Message 2
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| Subject: | Subject: Garmin 430 and King KX-155 frequency interferrence |
problem...
--> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
Problem and panel avionics:
COMM1 is a Garmin 430
COMM2 is a King KX-155
Audio panel is a King KMA-20
When the KMA-20 is switched over to TX on the KX-155, the TX'ing KX-155 activates
the 430 receiver section with audio noise output. It does not matter what
dissimilar freq's are set on either of the COMM units. They can be 10 MHz apart,
but, the 430 receiver will still break squelch.
The 430 squelch has been checked.
Both the 430 and 155 comm's have been swapped out with other units and the problem
stays with the aircraft.
I have had the following advice to check:
1. TX coax cable may have a bad grounding of the shield at the antenna(s).
2. The audio jack connections for the headphones, may have bad grounds at the
jacks.
3. A lead maybe missing from the shop installation of the 430. The lead is from
the 430, pin 14 of P2 connector, to the PTT switch. Garmin calls this the
"Transmit Interloc". I suspect that it drops the sensitivity of the 430 receiver
so that it will not break squelch, but, I have not confirmed this with Garmin.
I will be checking for this possible missing connection soon.
Any suggestions that might help me hunt down this RF problem causing the 430 to
break squelch whenever the KX-155 transmits would be greatly appreciated.
David
Message 3
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| Subject: | Re: Subject: Garmin 430 and King KX-155 frequency |
interferrence problem...
--> Avionics-List message posted by: "John D. Heath" <altoq@direcway.com>
Have you swaped out the KMA-20 ????
John D
----- Original Message -----
From: "David Lloyd" <skywagon@charter.net>
Subject: Avionics-List: Subject: Garmin 430 and King KX-155 frequency
interferrence problem...
> --> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
>
> Problem and panel avionics:
>
> COMM1 is a Garmin 430
> COMM2 is a King KX-155
> Audio panel is a King KMA-20
>
> When the KMA-20 is switched over to TX on the KX-155, the TX'ing KX-155
activates the 430 receiver section with audio noise output. It does not
matter what dissimilar freq's are set on either of the COMM units. They can
be 10 MHz apart, but, the 430 receiver will still break squelch.
>
> The 430 squelch has been checked.
> Both the 430 and 155 comm's have been swapped out with other units and
the problem stays with the aircraft.
>
> I have had the following advice to check:
>
> 1. TX coax cable may have a bad grounding of the shield at the
antenna(s).
> 2. The audio jack connections for the headphones, may have bad grounds at
the jacks.
> 3. A lead maybe missing from the shop installation of the 430. The lead
is from the 430, pin 14 of P2 connector, to the PTT switch. Garmin calls
this the "Transmit Interloc". I suspect that it drops the sensitivity of
the 430 receiver so that it will not break squelch, but, I have not
confirmed this with Garmin. I will be checking for this possible missing
connection soon.
>
> Any suggestions that might help me hunt down this RF problem causing the
430 to break squelch whenever the KX-155 transmits would be greatly
appreciated.
> David
>
>
Message 4
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| Subject: | Re: Bendix-King edge card connectors? |
--> Avionics-List message posted by: Doug McNutt <douglist@macnauchtan.com>
At 09:01 -0800 4/1/04, Dave Durakovich wrote:
>Anyone have a name/specification/source/??? for the edge card connectors/replacement
contacts that BK uses on their various units?
>Connectors as used on the KMA-24, KN-75, etc.
They were almost certainly Molex. I think I have a catalog and will check tonight.
--
--> There are 10 kinds of people: those who understand binary, and those who
don't <--
Message 5
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| Subject: | Re: Subject: Garmin 430 and King KX-155 frequency interferrence |
problem...
--> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
John,
I could not find a KMA-20 to swap out.
However, it is appearing like my list #3 "look at" subject is the problem.
My Garmin 430 was installed without the "Transmit Interlok" connection.
This signal is essential to quiet the 430 receiver front-end when the King
155 is TX'g. It looks like there is also some 430 s/w settings that have to
be adjusted when this connection is made. I am sorting this out as we
speak.
...more later and Thanks very much for your follow-up.
David
skywagon@charter.net
----- Original Message -----
From: "John D. Heath" <altoq@direcway.com>
Subject: Re: Avionics-List: Subject: Garmin 430 and King KX-155 frequency
interferrence problem...
> --> Avionics-List message posted by: "John D. Heath" <altoq@direcway.com>
>
> Have you swaped out the KMA-20 ????
>
> John D
>
>
> ----- Original Message -----
> From: "David Lloyd" <skywagon@charter.net>
> To: <avionics-list@matronics.com>
> Subject: Avionics-List: Subject: Garmin 430 and King KX-155 frequency
> interferrence problem...
>
>
> > --> Avionics-List message posted by: "David Lloyd"
<skywagon@charter.net>
> >
> > Problem and panel avionics:
> >
> > COMM1 is a Garmin 430
> > COMM2 is a King KX-155
> > Audio panel is a King KMA-20
> >
> > When the KMA-20 is switched over to TX on the KX-155, the TX'ing KX-155
> activates the 430 receiver section with audio noise output. It does not
> matter what dissimilar freq's are set on either of the COMM units. They
can
> be 10 MHz apart, but, the 430 receiver will still break squelch.
> >
> > The 430 squelch has been checked.
> > Both the 430 and 155 comm's have been swapped out with other units and
> the problem stays with the aircraft.
> >
> > I have had the following advice to check:
> >
> > 1. TX coax cable may have a bad grounding of the shield at the
> antenna(s).
> > 2. The audio jack connections for the headphones, may have bad grounds
at
> the jacks.
> > 3. A lead maybe missing from the shop installation of the 430. The
lead
> is from the 430, pin 14 of P2 connector, to the PTT switch. Garmin calls
> this the "Transmit Interloc". I suspect that it drops the sensitivity of
> the 430 receiver so that it will not break squelch, but, I have not
> confirmed this with Garmin. I will be checking for this possible missing
> connection soon.
> >
> > Any suggestions that might help me hunt down this RF problem causing
the
> 430 to break squelch whenever the KX-155 transmits would be greatly
> appreciated.
> > David
> >
> >
>
>
Message 6
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| Subject: | Official Usage Guideline [Please Read] [Monthly Posting] |
DNA: do not archive
--> Avionics-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Lister,
Please read over the Avionics-List Usage Guidelines below. The complete
Avionics-List FAQ including these Usage Guidelines can be found at the
following URL:
http://www.matronics.com/FAQs/Avionics-List.FAQ.html
Thank you,
Matt Dralle
Matronics Email List Administrator
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