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dots on crystals - 6/30/2002 2:33 AM   
ronwc



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From: LARGO, FL, USA
Status: offline 		What the heck are the three dots on the crystals. Are they all compatable if they are the same freq.

Ron - AMA 1025

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dots on crystals - 7/1/2002 8:56 PM   
dsnyder



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Status: offline 		Ron,
The dots on the crystal indicate how the crystal is tuned. A center dot indicates the crystal tuned right on the frequency, and left or right indicates that it tuned slightly off the exact center of the frequency on a scope. With the level of tuning today, it doesn't mean much. It used to be a guideline to not use a set of crystals with opposite dots, but it doesn't mean much today.
Thanks!
Danny

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crystals and rx - 7/1/2002 10:02 PM   
ronwc



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Status: offline 		Do you mean hoe the crystal is tuned or how the receiver is tuned. IS it true that rx's are tuned for high and low band or does that matter. If so, then why can you use the Hitec rx on all 50 freq.

Ron - AMA 1025

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dots on crystals - 7/1/2002 10:08 PM   
dsnyder



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Status: offline 		Ron,

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dots on crystals - 7/1/2002 10:11 PM   
dsnyder



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Status: offline 		Ron,
It is how the crystal is tuned, and does not indicate anything about the receiver. Receivers used to be tuned, JR at least, by a high and low band. But this is not the case any longer.
Sorry about the previous message, I hit the wrong key and it sent a reply...
Thanks!
Danny

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dots on crystals - 7/5/2002 4:01 PM   
MO_Radio_Tech


 

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Status: offline 		Actually, it is how the crystal is cut, not tuned. But as Danny said, with modern design and tuning, the dots don't matter anymore.

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dots on crystals - 7/6/2002 1:22 PM   
4*60


 

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Status: offline 		Danny:

FYI You could have editted that message and saved creating a new one. Just FYI.

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dots on crystals - 7/7/2002 9:56 PM   
Ladyflyer



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From: North Am, MT, USA
Status: offline 		It is tolerance limits . High ,center or lower limit . It is how the crystals are GROUND . The pressure in the mounting can also affect the crystals frequency.
In an ideal situation the transmitter and receiver would have matching crystals. Although we call them NARROW BAND radios ,they are not so narrow that the difference we are talking about is any concern.

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