Bob,
On 02/16/2011 10:51 PM, Bob Camp wrote:
Hi
According to the rules, you are not allowed to reset shift register other
than by feedback during a transmission. In order for a reset to be
"transparent" it would have to always happen at the same time. Usually
that's when the register is full or empty.
A proper (MLS) PN sequence will be (2^m) -1 long. For the allowed ham
sequences that would be 2^7 -1 = 127, 2^13 -1 = 8191, or 2^19 -1 = 524287.
If they are not MLS then I'm off a bit. None of those divide into 10 MHz
very well at all, since they all are prime numbers.
It's actually not the prime-number aspects which is important, all
Maximum Length Sequences (MLS) will not be prime-number lengths as not
all Mersenne numbers is primes, and then non-prime polynomial lengths
like 10 naturally breaks up (1023 = 31*33).
The key factor is that the sequences does not line due to lack of common
factors. However, this deficiency can be overcome by shortening the
sequence.
If you use the shortest sequence, you would get to reset every 127 seconds
with a simple approach. You likely would do better to run a bit more math
and figure out the "right" sequence for the time you are at.
Probably more trouble than it is worth it.
Cheers,
Magnus
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