niteviser wrote:
Ed,
The tuning pin is the FM pin of the 12.8MHz module. There were several 12.8
MHz references some with 3 pins and then some with 4 pins which used the half
rail to set the frequency mid point. It was quite acceptable to program to
the closest frequency on the Eprom
OK Ed,
I have 2 files showing the PCB details with -26 variant info. They frequency
reference is still kept totally internal. If higher stability or external
reference is available, the internal is removed and a mini coax socket fitted
to have a cable connected to have an input on the rear
niteviser wrote:
OK Ed,
I have 2 files showing the PCB details with -26 variant info. They frequency
reference is still kept totally internal. If higher stability or external
reference is available, the internal is removed and a mini coax socket fitted
to have a cable connected to have
Ed,
No external fixing, all internal just like the original. The 'Parts Lists
Amendment' states the alternative IC700 frequency reference is used in -16,
-26, -36 for FCC I think it differs from the standard by having 4 pins, one of
which is the FM pin with the voltage setting arrangement.
Hi Ed,
I have read the info again and it's a bit confusing. In the -26 variant the
IC700 reference is 539-00010-55 and the standard is 539-00010-50. But there
were different devices used under the 539-00010-50 number an 'old' one by NDK
and a 'new' one made by Rakon. The 'new' one only uses 3
niteviser wrote:
Hi Ed,
I have read the info again and it's a bit confusing. In the -26 variant the
IC700 reference is 539-00010-55 and the standard is 539-00010-50. But there
were different devices used under the 539-00010-50 number an 'old' one by NDK
and a 'new' one made by Rakon. The
Hi Ed,
The differences I see between the -25 and -26 are minor. Caps and resistors in
the Low Pass Filter audio stage and a different 12.8Mhz reference with a
voltage tuning pin, where the standard didn't have it. The specifications of
the reference are same otherwise, 1ppm -20 to +70. If you
niteviser wrote:
Hi Ed,
The differences I see between the -25 and -26 are minor. Caps and resistors
in the Low Pass Filter audio stage and a different 12.8Mhz reference with a
voltage tuning pin, where the standard didn't have it. The specifications of
the reference are same otherwise,
Ed,
The tuning pin is the FM pin of the 12.8MHz module. There were several 12.8 MHz
references some with 3 pins and then some with 4 pins which used the half rail
to set the frequency mid point. It was quite acceptable to program to the
closest frequency on the Eprom and pull the reference
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