Today's Message Index:
----------------------
1. 06:03 AM - Interference Becker 4201 radio (Hans Oortman)
2. 06:34 AM - OSH 2009 (cjpilot710@aol.com)
3. 06:49 AM - Re: Interference Becker 4201 radio (Roger Kemp M.D.)
4. 07:24 AM - Re: Interference Becker 4201 radio (Hans Oortman)
5. 10:19 AM - Becker radio noise (Frank Stelwagon)
6. 09:38 PM - Re: finance company? (Zjopa)
Message 1
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| Subject: | Interference Becker 4201 radio |
Mark,
I finally made the time available to do the tests/modifications we have
talked about with respect to the interference on a Becker VHF radio in my
Yak52.
I installed the Lonestar P-lead filters on both mags. Found that both
screens of the p-leads are in perfect condition but installed the filters ,
just to make sure.
The screening can now be called perfect. I have made a special copper "plug"
to fill up for the thinner wires on the filters. The screens of the filter
wires have been soldered to those "plugs" and locked in the mags.
Everything has been fixed thoroughly and inspected for grounding.
All OK so far. Started the engine and found no difference on the VHF, i.e.
the interference is still there. That means: the squelch is opened by the
interference. Switching off the squelch it appears that there is no constant
noise level but more of a kind of rattling noise which opens the squelch.
Checked antenna...found no problem or loose wires. Swr is within the airband
1 : 1.5 max.
So in my humble opinion there is only 1 thing left: the interference is
going into the vhf via the power supply or the power is that "dirty" that it
is picked up by the vhf antenna.....
I know that the Becker gets its power via a dc-dc converter of some sort,
after all the Yak has 24v standard power. Is the 12 volts present on any
standard Yak or is there a built in down converter somewhere??
What is the "voltage adjustment" screw meant for in the front cockpit??
Did some tests with the GPS also. When the GPS is connected to the power
plug and switched on, the noise level on the VHF opens the squelch which
makes it unuseable in flight.
Switched off gps: noise is reduced but squelch is still opened 6 out of 10
sec. Disconnected power supply lead from GPS but kept it connected to the
plane, same result as GPS being switched off, i.e. the VHF is picking up
interference via its antenna but the noise is generated one way or the other
on the power bus??
I have come to a point of saturation in my mind about the cause of this.
Taking a scope into the cockpit is probably the only way to find out whether
there is any noise on the power bus.
Probably another way is to power the VHF via the cigarette ligher connector
with another dc-dc converter. Thus bypassing the present circuitry but still
using the power on board.
Any suggestions, thoughts are welcomed!
Hans
RA3326K
Mob: +31 653 286022
Message 2
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Just talk to Jimmy Fordam a bit ago.
Our very own "Red Thunder" boys will be performing at OSH airshow this
year!
For the rest of RPA, Red Thunder is made up of a bunch of 'good old boys'
from the SE Region of RPA. They hail from TN, GA, and AL. They are sort
of like the T-28 Trojan guys, but with Yaks and CJs. They put on a fine
little show. They started this from attending the Waycross formation clinic!
Anyway Yawl will hear more about them. They are schedule to fly the
Friday July 31st show, at the end of the Warbird part of the show.
Jim "Pappy" Goolsby
**************A Good Credit Score is 700 or Above. See yours in just 2 easy
steps!
JulystepsfooterNO62)
Message 3
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| Subject: | Interference Becker 4201 radio |
Hans,
I also added a filter in line with the power supply from my converter to the
Becker radio. It to came from Lone Star Avionics.
http://www.lonestaraviation.com/product_details.asp?Product_Name=The
Eliminator. With the mag filters and the DC filter in line, the noise has
been pretty much eliminated.
The other place to check in your Tack generator shielding.
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
Sent: Friday, July 03, 2009 8:02 AM
Subject: Yak-List: Interference Becker 4201 radio
Mark,
I finally made the time available to do the tests/modifications we have
talked about with respect to the interference on a Becker VHF radio in my
Yak52.
I installed the Lonestar P-lead filters on both mags. Found that both
screens of the p-leads are in perfect condition but installed the filters ,
just to make sure.
The screening can now be called perfect. I have made a special copper "plug"
to fill up for the thinner wires on the filters. The screens of the filter
wires have been soldered to those "plugs" and locked in the mags.
Everything has been fixed thoroughly and inspected for grounding.
All OK so far. Started the engine and found no difference on the VHF, i.e.
the interference is still there. That means: the squelch is opened by the
interference. Switching off the squelch it appears that there is no constant
noise level but more of a kind of rattling noise which opens the squelch.
Checked antenna...found no problem or loose wires. Swr is within the airband
1 : 1.5 max.
So in my humble opinion there is only 1 thing left: the interference is
going into the vhf via the power supply or the power is that "dirty" that it
is picked up by the vhf antenna.....
I know that the Becker gets its power via a dc-dc converter of some sort,
after all the Yak has 24v standard power. Is the 12 volts present on any
standard Yak or is there a built in down converter somewhere??
What is the "voltage adjustment" screw meant for in the front cockpit??
Did some tests with the GPS also. When the GPS is connected to the power
plug and switched on, the noise level on the VHF opens the squelch which
makes it unuseable in flight.
Switched off gps: noise is reduced but squelch is still opened 6 out of 10
sec. Disconnected power supply lead from GPS but kept it connected to the
plane, same result as GPS being switched off, i.e. the VHF is picking up
interference via its antenna but the noise is generated one way or the other
on the power bus??
I have come to a point of saturation in my mind about the cause of this.
Taking a scope into the cockpit is probably the only way to find out whether
there is any noise on the power bus.
Probably another way is to power the VHF via the cigarette ligher connector
with another dc-dc converter. Thus bypassing the present circuitry but still
using the power on board.
Any suggestions, thoughts are welcomed!
Hans
RA3326K
Mob: +31 653 286022
Message 4
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| Subject: | Interference Becker 4201 radio |
Doc,
Yeah...I do have the in line filter as well as the capacitor for the
generator but did not install it yet. Have not found a place to install it
safely. I need to do that. I assume you installed it close to the busbar in
the area of the switches on the left side of the plane and then with a
shielded wire to the VHF??
What I don't understand though is why the Becker radio is so sensitive for
noise on the dc supply??
Hans
-----Oorspronkelijk bericht-----
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens Roger Kemp M.D.
Verzonden: vrijdag 3 juli 2009 15:45
Aan: yak-list@matronics.com
Onderwerp: RE: Yak-List: Interference Becker 4201 radio
--> <viperdoc@mindspring.com>
Hans,
I also added a filter in line with the power supply from my converter to the
Becker radio. It to came from Lone Star Avionics.
http://www.lonestaraviation.com/product_details.asp?Product_Name=The
Eliminator. With the mag filters and the DC filter in line, the noise has
been pretty much eliminated.
The other place to check in your Tack generator shielding.
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
Sent: Friday, July 03, 2009 8:02 AM
Subject: Yak-List: Interference Becker 4201 radio
Mark,
I finally made the time available to do the tests/modifications we have
talked about with respect to the interference on a Becker VHF radio in my
Yak52.
I installed the Lonestar P-lead filters on both mags. Found that both
screens of the p-leads are in perfect condition but installed the filters ,
just to make sure.
The screening can now be called perfect. I have made a special copper "plug"
to fill up for the thinner wires on the filters. The screens of the filter
wires have been soldered to those "plugs" and locked in the mags.
Everything has been fixed thoroughly and inspected for grounding.
All OK so far. Started the engine and found no difference on the VHF, i.e.
the interference is still there. That means: the squelch is opened by the
interference. Switching off the squelch it appears that there is no constant
noise level but more of a kind of rattling noise which opens the squelch.
Checked antenna...found no problem or loose wires. Swr is within the airband
1 : 1.5 max.
So in my humble opinion there is only 1 thing left: the interference is
going into the vhf via the power supply or the power is that "dirty" that it
is picked up by the vhf antenna.....
I know that the Becker gets its power via a dc-dc converter of some sort,
after all the Yak has 24v standard power. Is the 12 volts present on any
standard Yak or is there a built in down converter somewhere??
What is the "voltage adjustment" screw meant for in the front cockpit??
Did some tests with the GPS also. When the GPS is connected to the power
plug and switched on, the noise level on the VHF opens the squelch which
makes it unuseable in flight.
Switched off gps: noise is reduced but squelch is still opened 6 out of 10
sec. Disconnected power supply lead from GPS but kept it connected to the
plane, same result as GPS being switched off, i.e. the VHF is picking up
interference via its antenna but the noise is generated one way or the other
on the power bus??
I have come to a point of saturation in my mind about the cause of this.
Taking a scope into the cockpit is probably the only way to find out whether
there is any noise on the power bus.
Probably another way is to power the VHF via the cigarette ligher connector
with another dc-dc converter. Thus bypassing the present circuitry but still
using the power on board.
Any suggestions, thoughts are welcomed!
Hans
RA3326K
Mob: +31 653 286022
Message 5
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| Subject: | Becker radio noise |
There is one other thing to look at. In the settings section of the
Becker manual look at item 16. I imagine everyone is using powered
mikes and not dynamic mikes, the dynamic mike input gain should be set
to zero per the number 16 mode adjustment. This would show up in the
side tone as random noise.
Frank
CJ6-A N23021
Message 6
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| Subject: | Re: finance company? |
Try Wally Zook!
http://www.zookair.com/
--------
"Well, boys, we got three engines out, we got more holes in us than a horse
trader's mule, the radio is gone and we're leaking fuel and if we was flying
any lower why we'd need sleigh bells on this thing... "
- Henry Paulson, US Treasury Secretary
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