LF Stability

[Terry Fox]

Andre:
My discussion meant a single RF path, namely one transmitter ttalking to one
receiver.  They need to be on the same frequency, unless a repeater or other
frequency translator is used.  Sorry I didn't make that clear.
Terry.


Andre' Kesteloot wrote:

> Terry Fox wrote:
>
> > 1.  If we are going to communicate over long distances, we need some
> > method of determining what frequency to transmit, and therefore to
> > receive on.  The more accurate the two sides are on exact frequency, the
> > narrower the receiver can look.  This reduces noise, and can lead to
> > additional "processing gain".  The problem is how to coordinate the
> > frequency between the two sides to an amount that is worthwhile.
>
> yes, but we do not have to transmit and receive on the   _same_
> frequency.  The two frequnecies do not have to be related. It could also be
> that I am plagued by an insurmountable QRM on a frequency F1, and thus you
> should transmit to me on F2, and vice versa.
> On the other hand, if I know what frequency I transmit on, and I happen to
> be very stable, you could calibrate your transmitter to be nHz above or
> below from me, which will make my search for your transmission easier,
> (since I know where I am).
> In addition, we should be able to watch, say, a 200 Hz band without too much
> of a problem.
> 73
> Andre'