Today's Message Index:
----------------------
1. 11:29 AM - Re: MP gauge (Roger Kemp)
2. 01:25 PM - radio noise after installing plug conversion kit (Jan Mevis)
3. 02:31 PM - Re: Re: White Paper on Russian Generator System (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
4. 02:36 PM - Re: radio noise after installing plug conversion kit (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
5. 02:52 PM - Re: radio noise after installing plug conversion kit (Roger Kemp)
6. 04:50 PM - Re: White Paper on Russian Generator System (Rob Rowe)
7. 06:51 PM - Re: Breathing Clean Air - Masks? (Roger Kemp)
8. 10:47 PM - Re: radio noise after installing plug conversion kit (Jan Mevis)
9. 11:10 PM - Re: radio noise after installing plug conversion kit (Jan Mevis)
Message 1
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Smash,
Hep me now...whas au PS3 game guru? YO dun fl-n 55's? Giv'n up YAK's fo joystik's?
Doc
----- Original Message -----
From: Sarah Tobin
Sent: 2/21/2007 10:20:32 PM
Subject: Re: Yak-List: MP gauge
Be a PS3 game guru.
Get your game face on with the latest PS3 news and previews at Yahoo! Games.
Message 2
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| Subject: | radio noise after installing plug conversion kit |
Dear Mark,
THANKS A LOT! Your advise helped me solve the problem : the BNC-connector of
the antenna cable got disassembled! So I HEREBY CONFIRM : THE PLUG
CONVERSION KIT CABLES ARE NOT THE SOURCE OF THE RADIO NOISE IN MY PLANE!
I was mislead because my radio showed the noise problem after I did the plug
conversion, so it was logical to assume that there was a correlation. For
one reason or another the antenna cable could move around a bit. And all
things that are not well strapped in a Yak will cause problems sooner or
later. I did the test as you suggested, and bingo, problem diagnosed !
Once again, thanks a lot!
Jan Mevis
RA2005K
YK50
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich, Mark G
CIV Det Cherry Point, MALS-14 64E
Sent: dinsdag 20 februari 2007 22:48
Subject: RE: Yak-List: White Paper on Russian Generator System
MALS-14 64E" <mark.bitterlich@navy.mil>
Jan,
Let me repeat one thing if I may. If the noise to your radio goes away
completely when you disconnect the (almost) BNC connector on the back of
the radio that connects the antenna, then there is absolutely no use in
messing with the radios wiring what-so-over. Trust me on this one.
Radio noise can come in via a few different sources. The wires you
speak of, or the antenna, or both. If you disconnect the coax
connection to the radio, AT the radio, and all noise goes away
completely, then all noise is coming in from the antenna itself. Noise
filters will NEVER stop this type of noise. That is because the radio
is actually RECEIVING what it is SUPPOSED to be receiving. I.E. "RF
ENERGY".
As for spark energy.... You mention the spark plug cables. I agree ...
More or less.... But don't forget that the spark plugs now being used
are much MUCH better than anything being used before. Leaps and bounds
better.
If the shielding on the Tach Generator becomes completely disconnected,
the resultant noise can be so strong that it actually causes DAMAGE to
the receiver front end in a Balken-5 (sp) model radio flying in a 52. I
have actually seen that happen and have repaired the damage myself....
So believe me, it's true.
Pulling the antenna connector off the radio will tell the story.
Mark
P.s. There is ONE very REMOTE possibility that can help if all noise
STOPS when you pull off the coax cable connector from the radio, and
that is called "common mode interference". In cases like that, noise
comes down the shield of the coax and gets into the radio THAT way.
This can be eliminated by using torroidal chokes on the exerior of the
coax close to the radio. They look like small donuts, and using the
right ones are important. Regardless, this still presumes that all
noise goes away when you disconnect the antenna coax from the radio.
If that does as I expect it to do, and all noise goes away, then put the
coax back on the radio, and disconnect the connection from the antenna
itself. It the noise is still gone, it is NOT common mode interference,
and you either need to turn up the squelch, or eliminate the noise at
the source.... Not radio wiring.
Message 3
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| Subject: | Re: White Paper on Russian Generator System |
>>RR I found & translated the (attached) DMR-200D drawing which provides
>>a basic
cross-section of the differential relay, highlighting the various points
we've discussed;
- the latching mechanism appears to be the permanent magnets used to
polarise the operation (there's also a spring)
- the differential action across / between the shunt & series "windings"
(sic) tips the see-saw armature
- there is an adjustment screw shown
Unfortunately the accompanying description was the same as the YAK ops
handbook, which is even less informative than the Sukhoi info.
You need to get one in your hands and mess with it yourself I think Rob.
Wish I could help you in that regard!
>>RR I'll resend the marked up photo of the installed DMR-200D to your
private email (c.300Kb), together with a
revised Russian / English alphabet mapping ... simplified & now includes
all 31 Cyrillic chars used in modern Russian.
I'll put up a new "alphabet" thread on the YAK-List too with this PDF
file to see if it's of wider use / interest.
Btw - could not verify that I'd correctly labelled the "-" connection
from my photo, ditto could not locate connection "A" ... can you confirm
please, if you still have a DMR-200D to hand?
The "A" connection goes directly to the plus side of the main contactor
relay coil. Assuming of course the letter "A" is the letter "A". It is
located right below the negative marking.... Right side middle....
Marked with "-".
>>RR from your description it seems there are two sets of contacts with
the inputs paralleled from the generator feed;
That is correct.
>>RR one output side feeds the external signalling relay, the other
feeds the series connection of the differential polarised relay
As per the diagram, exactly.
>>RR From your email to me ...
RR>> Was there much of load on the battery just before the contactor
closed ... as presume the generator voltage needed to be just larger
than the bus before the shunt polarised relay would operate?
I was measuring the exact voltage at the contactor itself. There was no
"load" on the battery per se.
>>RR There seems to be a tipping point at (34% rpm) where the shunt
wound generator creates a load in its own right through becoming a
battery driven DC motor ... which could well be the surge you saw before
the polarised relay isolated it. From searching the net I also found a
reference to a WWII era aircraft that was prone to having the reverse
current relay stick causing the battery to quickly run flat, unless
overidden by the "generator switch" (that would deactivate the TKE1R2D
in our case).
That is correct. This type of generator does exactly as you describe
thus the need for the reverse current capability. Agreed on all your
further comments too. I looked at WW-II designs as well and they helped
me to finally grasp the purpose for each part in this design.
>>RR Wondered about this 20 volt statement (hence the above queries on
relay operating voltages) ... need to think on this some more as to why
it stabilises at greater than 20 volts. From a practical perspective I
guess it's not a good idea to have the generator charge a heavily
discharged battery anyway, especially if you're using Valve Regulated
Lead Acid (VRLA) batteries as these can be damaged by charging them over
c.1/4 (4-6 amps) of their rated capacity ... aside from the safety
issues.
I tested the 200D with NO BATTERY AT ALL connected to the output. The
main contactor in fact closed. This surprised me. However, it also
matched what the book said it would do if there was no battery voltage.
With the battery totally disconnected from the 200D, the main contactor
closed at 20 volts. So in fact, if your batteries ARE completely
discharged, the bad things you mentioned will indeed probably happen.
Small price to pay! :-)
Mark
Message 4
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| Subject: | radio noise after installing plug conversion kit |
My pleasure Jan, maybe someday I can come over and share dinner with
you. Hope I get the chance someday in any case!
Take care and I am really happy that you found the problem. We got
lucky with this one! :-)
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Jan Mevis
Sent: Thursday, February 22, 2007 16:21
Subject: Yak-List: radio noise after installing plug conversion kit
Dear Mark,
THANKS A LOT! Your advise helped me solve the problem : the
BNC-connector of the antenna cable got disassembled! So I HEREBY CONFIRM
: THE PLUG CONVERSION KIT CABLES ARE NOT THE SOURCE OF THE RADIO NOISE
IN MY PLANE!
I was mislead because my radio showed the noise problem after I did the
plug conversion, so it was logical to assume that there was a
correlation. For one reason or another the antenna cable could move
around a bit. And all things that are not well strapped in a Yak will
cause problems sooner or later. I did the test as you suggested, and
bingo, problem diagnosed !
Once again, thanks a lot!
Jan Mevis
RA2005K
YK50
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G CIV Det Cherry Point, MALS-14 64E
Sent: dinsdag 20 februari 2007 22:48
Subject: RE: Yak-List: White Paper on Russian Generator System
--> Point,
MALS-14 64E" <mark.bitterlich@navy.mil>
Jan,
Let me repeat one thing if I may. If the noise to your radio goes away
completely when you disconnect the (almost) BNC connector on the back of
the radio that connects the antenna, then there is absolutely no use in
messing with the radios wiring what-so-over. Trust me on this one.
Radio noise can come in via a few different sources. The wires you
speak of, or the antenna, or both. If you disconnect the coax
connection to the radio, AT the radio, and all noise goes away
completely, then all noise is coming in from the antenna itself. Noise
filters will NEVER stop this type of noise. That is because the radio
is actually RECEIVING what it is SUPPOSED to be receiving. I.E. "RF
ENERGY".
As for spark energy.... You mention the spark plug cables. I agree ...
More or less.... But don't forget that the spark plugs now being used
are much MUCH better than anything being used before. Leaps and bounds
better.
If the shielding on the Tach Generator becomes completely disconnected,
the resultant noise can be so strong that it actually causes DAMAGE to
the receiver front end in a Balken-5 (sp) model radio flying in a 52. I
have actually seen that happen and have repaired the damage myself....
So believe me, it's true.
Pulling the antenna connector off the radio will tell the story.
Mark
P.s. There is ONE very REMOTE possibility that can help if all noise
STOPS when you pull off the coax cable connector from the radio, and
that is called "common mode interference". In cases like that, noise
comes down the shield of the coax and gets into the radio THAT way.
This can be eliminated by using torroidal chokes on the exerior of the
coax close to the radio. They look like small donuts, and using the
right ones are important. Regardless, this still presumes that all
noise goes away when you disconnect the antenna coax from the radio.
If that does as I expect it to do, and all noise goes away, then put the
coax back on the radio, and disconnect the connection from the antenna
itself. It the noise is still gone, it is NOT common mode interference,
and you either need to turn up the squelch, or eliminate the noise at
the source.... Not radio wiring.
Message 5
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| Subject: | radio noise after installing plug conversion kit |
Jan,
Have been lurking and probably should have added something to this issue
earlier. I did the plug conversion on my 50 also. Had a lot of
interference/ "buzzing" on the radio. Could only get good signal (clear
transmissions) from A/C close by or near the AF. Traced it down to the
Russian radio cable and B/C connectors. I changed out to R 146 cable and
new B&C connectors with marked improvement. I have a Becker VHF installed
since I had pulled the Briz radio over a year ago. Had no problems until
after I did the plug conversion. I had already changed out the antenna from
the Russian so I knew it was not a West vs East technology issue.. or so I
thought. I had continued to use the Ru radio cable with new B&C connectors.
Once I changed the RU cable for R 146 all improved.
Now I have a buzz and pop at the ends of transmissions. If I turn the
automatic squelch off I have a continuous buzzing that is only present with
the engine running. It is not associated with throttle changes. So guess I
am now going to add a filter to the DC line into the radio to see if that
fixes it.
Doc
> [Original Message]
> From: Jan Mevis <jan.mevis@informavia.be>
> To: <yak-list@matronics.com>
> Date: 2/22/2007 3:53:21 PM
> Subject: Yak-List: radio noise after installing plug conversion kit
>
>
> Dear Mark,
>
> THANKS A LOT! Your advise helped me solve the problem : the BNC-connector
of
> the antenna cable got disassembled! So I HEREBY CONFIRM : THE PLUG
> CONVERSION KIT CABLES ARE NOT THE SOURCE OF THE RADIO NOISE IN MY PLANE!
>
> I was mislead because my radio showed the noise problem after I did the
plug
> conversion, so it was logical to assume that there was a correlation. For
> one reason or another the antenna cable could move around a bit. And all
> things that are not well strapped in a Yak will cause problems sooner or
> later. I did the test as you suggested, and bingo, problem diagnosed !
>
> Once again, thanks a lot!
>
>
> Jan Mevis
> RA2005K
> YK50
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G
> CIV Det Cherry Point, MALS-14 64E
> Sent: dinsdag 20 februari 2007 22:48
> To: yak-list@matronics.com
> Subject: RE: Yak-List: White Paper on Russian Generator System
>
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Jan,
>
> Let me repeat one thing if I may. If the noise to your radio goes away
> completely when you disconnect the (almost) BNC connector on the back of
> the radio that connects the antenna, then there is absolutely no use in
> messing with the radios wiring what-so-over. Trust me on this one.
> Radio noise can come in via a few different sources. The wires you
> speak of, or the antenna, or both. If you disconnect the coax
> connection to the radio, AT the radio, and all noise goes away
> completely, then all noise is coming in from the antenna itself. Noise
> filters will NEVER stop this type of noise. That is because the radio
> is actually RECEIVING what it is SUPPOSED to be receiving. I.E. "RF
> ENERGY".
>
> As for spark energy.... You mention the spark plug cables. I agree ...
> More or less.... But don't forget that the spark plugs now being used
> are much MUCH better than anything being used before. Leaps and bounds
> better.
>
> If the shielding on the Tach Generator becomes completely disconnected,
> the resultant noise can be so strong that it actually causes DAMAGE to
> the receiver front end in a Balken-5 (sp) model radio flying in a 52. I
> have actually seen that happen and have repaired the damage myself....
> So believe me, it's true.
>
> Pulling the antenna connector off the radio will tell the story.
>
> Mark
>
> P.s. There is ONE very REMOTE possibility that can help if all noise
> STOPS when you pull off the coax cable connector from the radio, and
> that is called "common mode interference". In cases like that, noise
> comes down the shield of the coax and gets into the radio THAT way.
> This can be eliminated by using torroidal chokes on the exerior of the
> coax close to the radio. They look like small donuts, and using the
> right ones are important. Regardless, this still presumes that all
> noise goes away when you disconnect the antenna coax from the radio.
>
> If that does as I expect it to do, and all noise goes away, then put the
> coax back on the radio, and disconnect the connection from the antenna
> itself. It the noise is still gone, it is NOT common mode interference,
> and you either need to turn up the squelch, or eliminate the noise at
> the source.... Not radio wiring.
>
>
Message 6
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| Subject: | Re: White Paper on Russian Generator System |
Well Mark with that out of the way I guess we've done this topic to death now!
Thanks, Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p'778#96778
Message 7
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| Subject: | Breathing Clean Air - Masks? |
Mark,
I know this was posted a while back. I am closing in on a cold catalyst for
converting CO (carbon monoxide) to C02 (carbon dioxide). There is one
company in the world that produces such a catalyst under license from NASA.
I am preparing to do timed/data CO measurements during all phases of
flight in the 52, 50, TW and hopefully a CJ.
I am bound by a non-disclosure contract with the manufacturer so I can not
release a great deal of info about how the catalyst works. Sorry, they
would not even talk to me about it until I signed the contract. More will
follow on this subject. For best results it would be best to use this
system asn a closed circuit. By saying that, I am saying that an aviator's
02 mask will be necessary to use this system. The MUB-12/P low profile
aviator's mask is probably the mask of choice.
I will post more as this developes.
Doc
> [Original Message]
> From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
<mark.bitterlich@navy.mil>
> To: <yak-list@matronics.com>
> Date: 1/19/2007 4:53:58 PM
> Subject: RE: Yak-List: Breathing Clean Air - Masks?
>
MALS-14 64E" <mark.bitterlich@navy.mil>
>
> I know a lot of Carbon monoxide is getting into my 50 simply by the way
> I feel after flights that are longer than normal. Not really a good
> thing. I fly summer and winter with that small vent by the front
> windscreen open ALL the time and try to breath THAT air. If one could
> verify that said air from that source is "clean", it would not take a
> lot to build a cover and hose that then fed a mask.
>
> Mark Bitterlich
>
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of David McGirt
> Sent: Friday, January 19, 2007 15:55
> To: yak-list@matronics.com
> Subject: Yak-List: Breathing Clean Air - Masks?
>
> Ok,
>
>
>
> I am sure I am not the only one to think about this, so I will ask the
> group.
>
>
>
> Has anyone thought about attaching a mask to an air scrubber to clean
> the air we are breathing in the cockpits? Say using a O2 mask for our
> helmets, and finding something for the other end?
>
>
>
> I know Pappy has done a lot of studies on the amount of CO2 and Carbon
> Diox in the cockpit, and I hope to borrow his monitor in Waycross next
> week to monitor my A/C.
>
>
>
> David
>
>
>
>
>
>
Message 8
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| Subject: | radio noise after installing plug conversion kit |
That would be really great. If you come to Europe please do. My mobile
number is on my website www.informavia.eu We're five Yak pilots in Temploux,
Namur (Belgium) and we're having a lot of fun. I've started another website
www.yakrobatic.eu
All the best !
Jan Mevis
+32 478 213400
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich, Mark G
CIV Det Cherry Point, MALS-14 64E
Sent: donderdag 22 februari 2007 23:36
Subject: RE: Yak-List: radio noise after installing plug conversion kit
MALS-14 64E" <mark.bitterlich@navy.mil>
My pleasure Jan, maybe someday I can come over and share dinner with
you. Hope I get the chance someday in any case!
Take care and I am really happy that you found the problem. We got
lucky with this one! :-)
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Jan Mevis
Sent: Thursday, February 22, 2007 16:21
Subject: Yak-List: radio noise after installing plug conversion kit
Dear Mark,
THANKS A LOT! Your advise helped me solve the problem : the
BNC-connector of the antenna cable got disassembled! So I HEREBY CONFIRM
: THE PLUG CONVERSION KIT CABLES ARE NOT THE SOURCE OF THE RADIO NOISE
IN MY PLANE!
I was mislead because my radio showed the noise problem after I did the
plug conversion, so it was logical to assume that there was a
correlation. For one reason or another the antenna cable could move
around a bit. And all things that are not well strapped in a Yak will
cause problems sooner or later. I did the test as you suggested, and
bingo, problem diagnosed !
Once again, thanks a lot!
Jan Mevis
RA2005K
YK50
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G CIV Det Cherry Point, MALS-14 64E
Sent: dinsdag 20 februari 2007 22:48
Subject: RE: Yak-List: White Paper on Russian Generator System
--> Point,
MALS-14 64E" <mark.bitterlich@navy.mil>
Jan,
Let me repeat one thing if I may. If the noise to your radio goes away
completely when you disconnect the (almost) BNC connector on the back of
the radio that connects the antenna, then there is absolutely no use in
messing with the radios wiring what-so-over. Trust me on this one.
Radio noise can come in via a few different sources. The wires you
speak of, or the antenna, or both. If you disconnect the coax
connection to the radio, AT the radio, and all noise goes away
completely, then all noise is coming in from the antenna itself. Noise
filters will NEVER stop this type of noise. That is because the radio
is actually RECEIVING what it is SUPPOSED to be receiving. I.E. "RF
ENERGY".
As for spark energy.... You mention the spark plug cables. I agree ...
More or less.... But don't forget that the spark plugs now being used
are much MUCH better than anything being used before. Leaps and bounds
better.
If the shielding on the Tach Generator becomes completely disconnected,
the resultant noise can be so strong that it actually causes DAMAGE to
the receiver front end in a Balken-5 (sp) model radio flying in a 52. I
have actually seen that happen and have repaired the damage myself....
So believe me, it's true.
Pulling the antenna connector off the radio will tell the story.
Mark
P.s. There is ONE very REMOTE possibility that can help if all noise
STOPS when you pull off the coax cable connector from the radio, and
that is called "common mode interference". In cases like that, noise
comes down the shield of the coax and gets into the radio THAT way.
This can be eliminated by using torroidal chokes on the exerior of the
coax close to the radio. They look like small donuts, and using the
right ones are important. Regardless, this still presumes that all
noise goes away when you disconnect the antenna coax from the radio.
If that does as I expect it to do, and all noise goes away, then put the
coax back on the radio, and disconnect the connection from the antenna
itself. It the noise is still gone, it is NOT common mode interference,
and you either need to turn up the squelch, or eliminate the noise at
the source.... Not radio wiring.
Message 9
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| Subject: | radio noise after installing plug conversion kit |
Doc,
It is as if you've got to change it all : either the whole Russian radio
system, or a complete western system. Maybe a problem with impedance changes
etc? I had to modify the microphone connections so that I could use a Dave
Clark headset (the Russian push-to-talk system did not put one connector of
the microphone to ground when speaking).
My Briz (which I put in place for a Ziabrik) works reasonably well. But I
had the trouble putting a BNC connector on the Russian antenna cable (the
ziabrik needed a very small connector, comparable to what is used in WIFI
equipment). Unfortunately until now I could not find a connector that really
fits. That's also the reason why the connector got damaged on my plane after
5 months of intensive use. It's an absolute coincidence that this happened
just after changing the plug cables.
But I do also only have clear transmissions when I'm close by or near other
radio stations. So I 'd better change the whole antenna system, I fear.
Thanks for the input! This is also very helpful!
All the best,
Jan
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
Sent: donderdag 22 februari 2007 23:52
Subject: RE: Yak-List: radio noise after installing plug conversion kit
Jan,
Have been lurking and probably should have added something to this issue
earlier. I did the plug conversion on my 50 also. Had a lot of
interference/ "buzzing" on the radio. Could only get good signal (clear
transmissions) from A/C close by or near the AF. Traced it down to the
Russian radio cable and B/C connectors. I changed out to R 146 cable and
new B&C connectors with marked improvement. I have a Becker VHF installed
since I had pulled the Briz radio over a year ago. Had no problems until
after I did the plug conversion. I had already changed out the antenna from
the Russian so I knew it was not a West vs East technology issue.. or so I
thought. I had continued to use the Ru radio cable with new B&C connectors.
Once I changed the RU cable for R 146 all improved.
Now I have a buzz and pop at the ends of transmissions. If I turn the
automatic squelch off I have a continuous buzzing that is only present with
the engine running. It is not associated with throttle changes. So guess I
am now going to add a filter to the DC line into the radio to see if that
fixes it.
Doc
> [Original Message]
> From: Jan Mevis <jan.mevis@informavia.be>
> To: <yak-list@matronics.com>
> Date: 2/22/2007 3:53:21 PM
> Subject: Yak-List: radio noise after installing plug conversion kit
>
>
> Dear Mark,
>
> THANKS A LOT! Your advise helped me solve the problem : the BNC-connector
of
> the antenna cable got disassembled! So I HEREBY CONFIRM : THE PLUG
> CONVERSION KIT CABLES ARE NOT THE SOURCE OF THE RADIO NOISE IN MY PLANE!
>
> I was mislead because my radio showed the noise problem after I did the
plug
> conversion, so it was logical to assume that there was a correlation. For
> one reason or another the antenna cable could move around a bit. And all
> things that are not well strapped in a Yak will cause problems sooner or
> later. I did the test as you suggested, and bingo, problem diagnosed !
>
> Once again, thanks a lot!
>
>
> Jan Mevis
> RA2005K
> YK50
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G
> CIV Det Cherry Point, MALS-14 64E
> Sent: dinsdag 20 februari 2007 22:48
> To: yak-list@matronics.com
> Subject: RE: Yak-List: White Paper on Russian Generator System
>
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Jan,
>
> Let me repeat one thing if I may. If the noise to your radio goes away
> completely when you disconnect the (almost) BNC connector on the back of
> the radio that connects the antenna, then there is absolutely no use in
> messing with the radios wiring what-so-over. Trust me on this one.
> Radio noise can come in via a few different sources. The wires you
> speak of, or the antenna, or both. If you disconnect the coax
> connection to the radio, AT the radio, and all noise goes away
> completely, then all noise is coming in from the antenna itself. Noise
> filters will NEVER stop this type of noise. That is because the radio
> is actually RECEIVING what it is SUPPOSED to be receiving. I.E. "RF
> ENERGY".
>
> As for spark energy.... You mention the spark plug cables. I agree ...
> More or less.... But don't forget that the spark plugs now being used
> are much MUCH better than anything being used before. Leaps and bounds
> better.
>
> If the shielding on the Tach Generator becomes completely disconnected,
> the resultant noise can be so strong that it actually causes DAMAGE to
> the receiver front end in a Balken-5 (sp) model radio flying in a 52. I
> have actually seen that happen and have repaired the damage myself....
> So believe me, it's true.
>
> Pulling the antenna connector off the radio will tell the story.
>
> Mark
>
> P.s. There is ONE very REMOTE possibility that can help if all noise
> STOPS when you pull off the coax cable connector from the radio, and
> that is called "common mode interference". In cases like that, noise
> comes down the shield of the coax and gets into the radio THAT way.
> This can be eliminated by using torroidal chokes on the exerior of the
> coax close to the radio. They look like small donuts, and using the
> right ones are important. Regardless, this still presumes that all
> noise goes away when you disconnect the antenna coax from the radio.
>
> If that does as I expect it to do, and all noise goes away, then put the
> coax back on the radio, and disconnect the connection from the antenna
> itself. It the noise is still gone, it is NOT common mode interference,
> and you either need to turn up the squelch, or eliminate the noise at
> the source.... Not radio wiring.
>
>
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