Discussion:
Seeking Toyocom or NDK through hole oscillator information
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skipp isaham via time-nuts
2018-06-14 05:53:12 UTC
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Seeking Toyocom or NDK through hole oscillator information


Hello again to the group,

I'm looking for a Data Sheet or information that would provide
the connection information for a (Epson) Toyocom TCO-519 or NDK
PIA3003A Oscillator module, both are through hole mounting.

Both appear to be a reasonably conventional, but now a discontinued
through-hole part, but I'm unable to find any same or similar data
sheet information that would tell me how to use connect them. Both
are 16.368 MHz

Appearance wise, they are both an approx 1 inch square, 3/8" high,
silver metal covered oscillator module. Five through hole mounting
connection leads on the bottom, one in each corner, the fifth lead
is centered along the side between two corners.

A data sheet or even just the generic connection information with
an idea of what each pin does would be wonderful. A few of these
arrived in a parts donation box hand labeled "Trimble Development".

Possibly something Trimble significant with the 16.368 MHz
frequency that I'm not yet aware of... if anyone would care
to speculate, please do.


Thank you in advance for your replies

cheers,
skipp

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Tim Shoppa
2018-06-14 11:27:54 UTC
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Quoting Wikipedia; 16.368 MHz is 16 times the 1.023 MHz C/A GPS signal chipping rate; multiplied by 96.25 to get the 1575.42 MHz L1 frequency and multiplied by 75 to get the 1227.60 MHz L2 frequency.
Post by skipp isaham via time-nuts
Seeking Toyocom or NDK through hole oscillator information
Hello again to the group,
I'm looking for a Data Sheet or information that would provide
the connection information for a (Epson) Toyocom TCO-519 or NDK
PIA3003A Oscillator module, both are through hole mounting.
Both appear to be a reasonably conventional, but now a discontinued
through-hole part, but I'm unable to find any same or similar data
sheet information that would tell me how to use connect them. Both
are 16.368 MHz
Appearance wise, they are both an approx 1 inch square, 3/8" high,
silver metal covered oscillator module. Five through hole mounting
connection leads on the bottom, one in each corner, the fifth lead
is centered along the side between two corners.
A data sheet or even just the generic connection information with
an idea of what each pin does would be wonderful. A few of these
arrived in a parts donation box hand labeled "Trimble Development".
Possibly something Trimble significant with the 16.368 MHz
frequency that I'm not yet aware of... if anyone would care
to speculate, please do.
Thank you in advance for your replies
cheers,
skipp
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jimlux
2018-06-14 12:20:12 UTC
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Post by Tim Shoppa
Quoting Wikipedia; 16.368 MHz is 16 times the 1.023 MHz C/A GPS signal chipping rate; multiplied by 96.25 to get the 1575.42 MHz L1 frequency and multiplied by 75 to get the 1227.60 MHz L2 frequency.
Post by skipp isaham via time-nuts
Possibly something Trimble significant with the 16.368 MHz
frequency that I'm not yet aware of... if anyone would care
to speculate, please do.
A typical direct sampling receiver would sample the RF at 16.368, and
that puts the L1 received signal nicely at fs/4. The P code would
overlap the sampling bandwidth of 8.184 MHz, but the C/A code fits well
within that range. And, since it's not at "zero", any doppler just moves
it from the center, but it's still "positive" frequency.


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