Synchro Signal Frequency changes

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Discussion Overview

The discussion revolves around the issue of frequency changes in a synchro signal output from a system when connected to a glide slope indicator. Participants explore potential causes for the frequency change from 400Hz to lower values when the system is connected, while also addressing the implications of the synchro signal's performance in this context.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant describes a system that outputs a synchro signal, noting that the frequency changes when connected to another system, specifically a glide slope indicator.
  • Several participants inquire about the specifics of the systems involved and the nature of the synchronization, seeking clarification on what is being synchronized.
  • Concerns are raised about the safety and reliability of advice given the specialized nature of the systems, with some participants suggesting that the topic may be too complex for a general forum.
  • Another participant questions the voltage and frequency measurements, suggesting that a test equipment error might be responsible for the observed changes.
  • Participants discuss the possibility of a near short circuit affecting the output behavior and the importance of verifying the functionality of the components involved.
  • There is a suggestion that the synchro system may be similar to older technologies like Selsyns, which could introduce additional factors affecting performance.
  • One participant confirms that the initial frequency reported was a typo, clarifying that it should be 400Hz, not 400KHz, and discusses the implications of voltage drop during operation.
  • Another participant raises the question of whether the glide slope indicator itself might be faulty, prompting further investigation into the system's components.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and expertise regarding the systems involved, leading to multiple competing views on the potential causes of the frequency change. The discussion remains unresolved, with no consensus on the underlying issue.

Contextual Notes

Participants highlight the need for specific manuals and detailed descriptions of the systems to better understand the connections and interactions. There are also references to limitations in the information provided, which may hinder troubleshooting efforts.

Who May Find This Useful

This discussion may be of interest to engineers and technicians working with synchro systems, glide slope indicators, or related avionics technology, as well as those involved in troubleshooting electronic signal issues.

  • #31
Is it possible that it has been rewired wrongly, or the wrong cables are being used to make the connections.
My suspicion is that the connections to one phase has been reversed by connection to the wrong terminals, or is shorted to ground.
That would give a completely different set of V(s1-s2), V(s2-s3), V(s3-s1) voltages.
Check the connections.
Measure the three voltages relative to the common centre voltage which may not be ground.
 
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  • #32
grasscut said:
I honestly do not have the information. and i really wish i could share more.
i try to make do with what i have and the information you guys had shared with me thus far.
Are you saying that neither unit has a name plate on it? Even a few photos would help. We are too much in the dark to be of real help.
 
  • #33
Baluncore said:
Is it possible that it has been rewired wrongly, or the wrong cables are being used to make the connections.
My suspicion is that the connections to one phase has been reversed by connection to the wrong terminals, or is shorted to ground.
That would give a completely different set of V(s1-s2), V(s2-s3), V(s3-s1) voltages.
Check the connections.
Measure the three voltages relative to the common centre voltage which may not be ground.
It might be the cause where the glide slope indicator itself has wired the S1S2S3 wrongly, but i don't know what's the configuration like. Even if the connection is wrong, will it affect the frequency? because the frequency seems to be quite a drastic change though. I have measured my system output with an angle position indicator and my outputs are correct. Even at the end of the system, i measured the wires of my outputs and it seems fine too. However, the voltage and frequency just changed when its connected to the glide path indicator terminal.

sophiecentaur said:
Are you saying that neither unit has a name plate on it? Even a few photos would help. We are too much in the dark to be of real help.
I just got to know the brand is AGI.
 
  • #34
The lack of certification plates with manufacturer and model numbers suggests it has been scrapped. That may be because it was faulty.
Where did you get it from? Scrapped? Stolen? Junk shop?
The frequency might be bad because you are not measuring the wrong signal or relative to the wrong reference.
When you measure the voltage and frequency, what do you measure it relative to?
What actually is the instrument? Ground or aircraft based? Attitude indicator, turn and bank or glide slope indicator.
Is there a similar instrument on google immages? Can you give us a link or a pictures of your unit?
 
  • #35
Baluncore said:
The lack of certification plates with manufacturer and model numbers suggests it has been scrapped. That may be because it was faulty.
Where did you get it from? Scrapped? Stolen? Junk shop?
The frequency might be bad because you are not measuring the wrong signal or relative to the wrong reference.
When you measure the voltage and frequency, what do you measure it relative to?
What actually is the instrument? Ground or aircraft based? Attitude indicator, turn and bank or glide slope indicator.
Is there a similar instrument on google immages? Can you give us a link or a pictures of your unit?

I measured the voltage and frequency across S1S2, S2S3, S1S3. i did mention that it is glide slope indicator in my previous post
 
  • #36
?8 Insufficient information to progress the matter.
 
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  • #37
@grasscut, without more information and/or pictures we can't help tough any more.

If you get the nameplate data and pictures, send me a PM. Just click on my name and start a conversation.

Until then, this thread is locked.
 
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