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mark.bitterlich(at)navy.m
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 Posted: Thu Aug 28, 2014 11:34 am Post subject: Recommended radio for Yak 52 |
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Roger that. I really should have been more definitive when I made that Becker statement.
There are two ways to get rid of radio noise. Eliminate the noise at the source, or make an attempt to keep existing noise from getting into the radio.
There is no question that the best way to keep ignition noise under control is to use a gross shield for every wire and sparkplug. That is what the original Russian design did. Every single wire was run inside of a metal tube, and basically there was a solid metal shield surrounding every single place ignition noise could leak out of. This is the best example of keeping noise under control at the source, but it came with a price. The Russian spark plug wire was very prone to deterioration and cross over coupling. An early attempt to address this was to replace the Russian spark plug wires with silicone wires inside of the original tube. This helped, but troubleshooting and repairing this design was problematic to put it mildly.
Then Dennis came out with the idea of replacing all of that with Taylor high quality ignition wires, and automobile spark plugs. Anyone who has done this modification knows that the engine runs MUCH better than it ever had before with a good solid spark getting to the cylinders. But, there is no way open wiring is going to be as quiet as wires inside of solid metal tube. So, the noise floor was increased, and that is a price you have to pay.
Another well-known source of noise is the P Leaks coming out of each Mag. These must be perfectly shielded, by-passed, filtered (etc.) or once again you raise the noise floor.
Enter the P1000 digital tach from Horizon Instruments. This is a really cool tach and works exceptionally well. However, the design requires the installer to tap into P Leads from BOTH of the mags, and run that new wiring up to the Tach. It is VERY easy when doing this to create a situation where even more P lead noise "leaks out".
The Becker radio is a good radio but there is no question that it is more susceptible to noise than just about any other model radio I have ever had experience with. Originally designed for gliders where weight was the most important issue, and shielding against engine noise was not, this makes perfect sense.
Some folks have had very good luck with Becker radios in YAK and CJ aircraft. However, if you start adding new things to the airplane that increase the noise floor, it will start "hearing" that noise before most other models would. If you work hard enough, you can sometimes keep the noise under control enough to keep using them. And sometimes you can't.
Mark
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Thu Aug 28, 2014 11:51 am Post subject: Recommended radio for Yak 52 |
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Copy all. Have added Filters just about everywhere. That got the reception pushed out to about 10 miles in the clear but anything out farther was a buzz.
Doc
Sent from my iPad
[quote] On Aug 28, 2014, at 2:32 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich(at)navy.mil> wrote:
Roger that. I really should have been more definitive when I made that Becker statement.
There are two ways to get rid of radio noise. Eliminate the noise at the source, or make an attempt to keep existing noise from getting into the radio.
There is no question that the best way to keep ignition noise under control is to use a gross shield for every wire and sparkplug. That is what the original Russian design did. Every single wire was run inside of a metal tube, and basically there was a solid metal shield surrounding every single place ignition noise could leak out of. This is the best example of keeping noise under control at the source, but it came with a price. The Russian spark plug wire was very prone to deterioration and cross over coupling. An early attempt to address this was to replace the Russian spark plug wires with silicone wires inside of the original tube. This helped, but troubleshooting and repairing this design was problematic to put it mildly.
Then Dennis came out with the idea of replacing all of that with Taylor high quality ignition wires, and automobile spark plugs. Anyone who has done this modification knows that the engine runs MUCH better than it ever had before with a good solid spark getting to the cylinders. But, there is no way open wiring is going to be as quiet as wires inside of solid metal tube. So, the noise floor was increased, and that is a price you have to pay.
Another well-known source of noise is the P Leaks coming out of each Mag. These must be perfectly shielded, by-passed, filtered (etc.) or once again you raise the noise floor.
Enter the P1000 digital tach from Horizon Instruments. This is a really cool tach and works exceptionally well. However, the design requires the installer to tap into P Leads from BOTH of the mags, and run that new wiring up to the Tach. It is VERY easy when doing this to create a situation where even more P lead noise "leaks out".
The Becker radio is a good radio but there is no question that it is more susceptible to noise than just about any other model radio I have ever had experience with. Originally designed for gliders where weight was the most important issue, and shielding against engine noise was not, this makes perfect sense.
Some folks have had very good luck with Becker radios in YAK and CJ aircraft. However, if you start adding new things to the airplane that increase the noise floor, it will start "hearing" that noise before most other models would. If you work hard enough, you can sometimes keep the noise under control enough to keep using them. And sometimes you can't.
Mark
--
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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