Greetings Joe,
Except for the difference in the marked frequency, there is no difference
between the so-called "parallel resonant" and "series resonant" crystals.
There is a minute difference in the physical dimensions and/or the angle of the
cut(s) relative to the crystallographic axes to
Hi Bob; Jim;
After I wrote that I did take a look at RS232 serial specs and yes, they are
quite permissive.
The programmer I have is simply an IBM PS2/E "pizza box" which is a 486 machine
running DOS.
Motorola was not very competent in their design of radio service software and
as such,
the
Async communications will usually tolerate an timing error of about 0.5 bit
time in 10 bits or about 5%. So if your oscillator is within 1% (10,000
ppm) you should be OK in that regard.
I suspect your serial communication problem is coming from someplace else.
Maybe the radio needs real RS-232
Hi
First off, the programmer will work with any of the crystals you are talking
about.
You should be fine at 0.1% which would be +/- 7.4 KHz relative to 7.3728 MHz.
Indeed you should find that serial com will work fine at offsets even greater
than this.
In terms of birdies - does the radio
It seems some Crystal experts are on line, so here goes with my question.
I have this microcomputer circuit (attached) that is in a Motorola
Systems Saber radio. It contains a 68HC11 uC that requires Y400 which
is a 7.3728 MHz crystal. Motorola no longer provides an OEM replacement
for this
