[Amps] 160m RTTY

[Roger D Johnson]

David G4FTC wrote:


> 
> I recall being told that with Loran, the phase comparison was done on one of 
> the cycles in the early part of the pulse (perhaps the 6th cycle?) so as to 
> avoid the effects of the multipath which would take longer to get to the 
> receiver.
> 
> 
> I would be grateful if someone could verify this.
> 
> David G4FTC

In the older LORAN A system the received envelopes were matched
manually by the operator to establish the time difference
reading. The later, and still current, LORAN C uses envelope
matching for coarse timing and phase comparison on the 3rd
cycle crossover point for fine timing. In addition, the pulses
are phase coded to help alleviate the effects of skywaves.

73, Roger (former LORAN A and C station commander)


-- 
Remember the USS Liberty (AGTR-5)
http://ussliberty.org/