Today's Message Index:
----------------------
1. 12:26 AM - Re: Pin out for DVOR (Peter Mather)
2. 05:17 AM - Re: Pin out for DVOR (Steven Fingerhut)
3. 06:24 AM - Re: Bendix King Service Bulletins..... (Mike)
4. 08:23 AM - vexing comm problem ()
5. 09:13 AM - Re: Bendix King Service Bulletins..... (David Lloyd)
6. 09:31 AM - Re: vexing comm problem (Healy, Joseph)
7. 10:05 AM - Re: vexing comm problem (John Rippengal)
Message 1
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| Subject: | Re: Pin out for DVOR |
--> Avionics-List message posted by: "Peter Mather" <peter@mather.com>
Steve
Pinout is in their brochure
http://www.davtron.com/documents/m903_brochure.pdf
Best regards
Peter
On Tue, 15 Jun 2004 19:28:52 -0500, Steven Fingerhut
wrote
>
> --> Avionics-List message posted by: Steven Fingerhut
> <beechboy@nctv.com>
>
> Hello group.
>
> I finally saved enough money (fun coupons) for a
Garmin
> 530 and 330 to be
> installed in my BE35. The avionics shop removed my
> DVOR, HT instruments
> Model DVOR/200 ser#106, and then could not find the
pin
> diagram out to
> replace it. They have been looking for several weeks
> without any luck.
>
> Does anyone have any ideas where to look? One of the
> people at the avionic
> shop looked on the internet but the site was in
Spanish
> and they would have
> to sign-up in Spanish to have access to the site which
> MIGHT contain the
> info we need.
>
> Thanks for any help you might have,
> Steve
>
>
>
> Contributions
> any other
Forums.
>
>
> http://www.matronics.com/subscription
> http://www.matronics.com/FAQ/Avionics-List.htm
http://www.matronics.com/photoshare
http://www.matronics.com/emaillists
>
Message 2
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| Subject: | Re: Pin out for DVOR |
--> Avionics-List message posted by: Steven Fingerhut <beechboy@nctv.com>
Peter,
Thanks for sending the link. Unfortunatly this will not work for me. I am
looking for the pin out on an HT Instruments model DVOR/200.
Steve
> From: "Peter Mather" <peter@mather.com>
> Reply-To: avionics-list@matronics.com
> Date: Wed, 16 Jun 2004 00:25:38 -0700 (PDT)
> To: avionics-list@matronics.com
> Subject: Re: Avionics-List: Pin out for DVOR
>
> --> Avionics-List message posted by: "Peter Mather" <peter@mather.com>
>
> Steve
>
> Pinout is in their brochure
>
> http://www.davtron.com/documents/m903_brochure.pdf
>
> Best regards
>
> Peter
>
> On Tue, 15 Jun 2004 19:28:52 -0500, Steven Fingerhut
> wrote
>
>>
>> --> Avionics-List message posted by: Steven Fingerhut
>> <beechboy@nctv.com>
>>
>> Hello group.
>>
>> I finally saved enough money (fun coupons) for a
> Garmin
>> 530 and 330 to be
>> installed in my BE35. The avionics shop removed my
>> DVOR, HT instruments
>> Model DVOR/200 ser#106, and then could not find the
> pin
>> diagram out to
>> replace it. They have been looking for several weeks
>> without any luck.
>>
>> Does anyone have any ideas where to look? One of the
>> people at the avionic
>> shop looked on the internet but the site was in
> Spanish
>> and they would have
>> to sign-up in Spanish to have access to the site which
>> MIGHT contain the
>> info we need.
>>
>> Thanks for any help you might have,
>> Steve
>>
>>
>>
>> Contributions
>> any other
> Forums.
>>
>>
>> http://www.matronics.com/subscription
>> http://www.matronics.com/FAQ/Avionics-List.htm
> http://www.matronics.com/photoshare
> http://www.matronics.com/emaillists
>>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Bendix King Service Bulletins..... |
--> Avionics-List message posted by: "Mike" <mike@ferrer-aviation.com>
David,
Sounds like it is a problem with the 430. One more thing you might do is
pull the 430 and verify that pin 14 of P4002 does actually go low (i.e.,
less than 1.9v or less than 375 ohms to gnd) when the KX155 PTT is
activated. If necessary, fabricate a long probe that will plug into pin 14.
Also verify that pin 14 is fully inserted into connector housing and locked
into position.
BTW, did the avionics shop swap out your 430 as a test? That would confirm
the problem is within the 430 before sending it back to the factory.
Mike
----- Original Message -----
From: "David Lloyd" <skywagon@charter.net>
Subject: Re: Avionics-List: Bendix King Service Bulletins.....
> --> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
>
> Hi Mike,
> I watched the avionics tech install the single wire and verified that he
> tied the correct pins. Pin 14 on the Garmin and pin 6 on the King 155.
The
> effect was essentially nothing.
> The 430 is coming out next week and being shipped to Garmin. They are
aware
> of my problem and want to look at the circuitry. My guess is the logic
tied
> to the Transmit Interlock line is not doing its job when pulled low by the
> 155 PTT swt.
> I am open for any ideas on this 430 squelch problem. I had the 430
squelch
> levels reviewed and adjusted. I have swapped out the King 155 and the
> KMA-20 audio and the problem stayed with the plane.
> David
>
>
Message 4
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| Subject: | vexing comm problem |
--> Avionics-List message posted by: <bakerocb@cox.net>
6/16/2004
Hello Brian Lloyd, and Other Willing Experts, I have a vexing problem with the
VHF comm portion of my Garmin 430 installed in my KIS TR-1 that I'd like some
help with. Here is the fundamental problem scenario:
1) Start engine, talk to ground control (121.8) using Lightspeed headset, pilot's
push to talk button, and pilot's headset jacks. Everything works normally
so taxi out and make engine run up.
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.
3) Put on copilot's headset (David Clark) which is plugged into copilot's jacks,
use copilot's push to talk button and transmit clearly to tower to request and
receive take off clearance.
4) On some rare occasions (tower is familiar with the problem) I get take off clearance
without going to step 2), I take off, switch to departure control (120.82
or 124.65)and have clear communications both directions with departure control
using the equipment in 1).
5) Upon return to home field at the end of a flight where the equipment in 1) above
has worked fine on other frequencies I switch to 133.1 and get the machine
gun effect again when I key the transmitter -- impossible to transmit coherently.
I can solve the problem by using step 3).
Here is what has been tried in the way of trouble shooting or problem solving.
A) Switched headsets between pilot's and copilot's jacks -- problem remains.
B) Extensively worked over pilot's headset jacks to eliminate any intermittent
problems that might exist.
C) Extensively worked over pilots PTT circuit (not button itself) to ensure good
continuity.
The baffling thing seems to be that the only two common items that don't go away
or can not be changed are the frequency of 133.1 and the pilot's PTT button.
When ever these two are combined regardless of what ever else is changed this
machine gun transmit problem may, but not in every instance, exist.
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 5
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| Subject: | Re: Bendix King Service Bulletins..... |
--> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
Mike,
We did not have the ability to verify that pin 14 actually goes low when the
PTT swt. is closed. We were working in my hanger with limited access to
optional stuff.
I did verify that the pin 14 and pin 6 "pins" did get seated properly with
the audible click and pull test.
Before I sent the 430 off to Garmin, I will figure a method to piggy-back to
pin 14 with a wire and volt meter and verify that the pin is pulled below 2
volts.
We were not able to swap out the 430 as no other was available. We have a
small avionics shop, one guy, on the field as well as Chief Aircraft. Even
though Chief is on our field, he does not have Garmin and I won't use them
unless desperate.
Thanks for the suggestions. When we finally get this problem solved, I will
post it to the List so others might have the info.
David
----- Original Message -----
From: "Mike" <mike@ferrer-aviation.com>
Subject: Re: Avionics-List: Bendix King Service Bulletins.....
> --> Avionics-List message posted by: "Mike" <mike@ferrer-aviation.com>
>
> David,
>
> Sounds like it is a problem with the 430. One more thing you might do is
> pull the 430 and verify that pin 14 of P4002 does actually go low (i.e.,
> less than 1.9v or less than 375 ohms to gnd) when the KX155 PTT is
> activated. If necessary, fabricate a long probe that will plug into pin
14.
>
> Also verify that pin 14 is fully inserted into connector housing and
locked
> into position.
>
> BTW, did the avionics shop swap out your 430 as a test? That would confirm
> the problem is within the 430 before sending it back to the factory.
>
> Mike
>
> ----- Original Message -----
> From: "David Lloyd" <skywagon@charter.net>
> To: <avionics-list@matronics.com>
> Subject: Re: Avionics-List: Bendix King Service Bulletins.....
>
>
> > --> Avionics-List message posted by: "David Lloyd"
<skywagon@charter.net>
> >
> > Hi Mike,
> > I watched the avionics tech install the single wire and verified that he
> > tied the correct pins. Pin 14 on the Garmin and pin 6 on the King 155.
> The
> > effect was essentially nothing.
> > The 430 is coming out next week and being shipped to Garmin. They are
> aware
> > of my problem and want to look at the circuitry. My guess is the logic
> tied
> > to the Transmit Interlock line is not doing its job when pulled low by
the
> > 155 PTT swt.
> > I am open for any ideas on this 430 squelch problem. I had the 430
> squelch
> > levels reviewed and adjusted. I have swapped out the King 155 and the
> > KMA-20 audio and the problem stayed with the plane.
> > David
> >
> >
>
>
Message 6
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| Subject: | vexing comm problem |
--> Avionics-List message posted by: "Healy, Joseph" <WJH@BRPLUSA.COM>
Do you have electronic ignition? Is the machine gun sound the same
frequency no matter what the engine RPM?...
Power disturbances can be a challenge. If high frequency wires are
contained in a conduit, the interaction of the conduit (or airframe) and
the wires can create an impedance in the circuit. There may be a
harmonic interference at 133.1 for that section of wire leading to the
pilots PTT switch.
What is the difference between the way the co-pilots PTT switch and the
pilots PTT switch is wired? i.e. in conduit with other wires, shorter or
longer lengths etc.?
As a test, you could disconnect the wires from the pilots PTT switch and
run a new set across the cockpit laying in the open. If it works at that
stage then it may be harmonic interference.
Joe Healy
Email: jhealy@brplusa.com
-----Original Message-----
6/16/2004
Hello Brian Lloyd, and Other Willing Experts, I have a vexing problem
with the VHF comm portion of my Garmin 430 installed in my KIS TR-1 that
I'd like some help with. Here is the fundamental problem scenario:
1) Start engine, talk to ground control (121.8) using Lightspeed
headset, pilot's push to talk button, and pilot's headset jacks.
Everything works normally so taxi out and make engine run up.
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.
Message 7
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| Subject: | Re: 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
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