[GPS_Standard] 6, 4MHz Oszillator in use with gps frequency standard

[Bert, VE2ZAZ]

Hi Andreas,

Yes, absolutely. This is the way to do it and it will work.

Cheers,

Bert, VE2ZAZ

----- Original Message -----
From: "Andreas Stefan" <andreas.stefan at web.de>
To: <gps_standard at mailman.qth.net>
Sent: Monday, April 06, 2009 4:24 AM
Subject: [GPS_Standard] 6,4MHz Oszillator in use with gps frequency standard


Hi Bert and the list,
congrats for these great project!!!
My name is Andreas, DL5MGD. I am located aboutt 50km south of munich in
bavaria.
I have a very good double ovened xo for 6,4 MHz.
Looking at your software it seems that it could be used by only changing a
few lines of code
at 6,4MHz


original code snippet
....
ccp_160mhz_h                EQU 0x68             ;when frequency counted is
exactly 160MHz, OLD_CCPR1 reads 26624, or 0x6800
ccp_160mhz_l                EQU 0x00              ; "
......

INIT_10MHz                                          ;Yes, initialize for
10MHz OCXO
        MOVLW ccp_160mhz_h                          ;Load nominal value H to
compare to measured frequency
        MOVWF NOMINAL_FREQ_VAL_H                    ; "
        MOVLW ccp_160mhz_l                          ;Load nominal value L to
compare to measured frequency
        MOVWF NOMINAL_FREQ_VAL_L                    ; "
        BRA INIT_FREQ_COMPLETED                     ;Go continue
initialization
.....

Will the 6,4Mhz work if I change this part of the program to
 ------
ccp_160mhz_h                EQU 0x80             ;when frequency counted is
exactly 102,4MHz ( 16 times 6,4 MHz)
ccp_160mhz_l                EQU 0x00              ; "
---------


Thanks a lot!!!

73
Andreas; DL5MGD

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