[time-nuts] eLORAN in the Antipodes ? (was: Re: eLORAN will be on the air GRI 99600)

[Bob kb8tq]

Hi


> On Aug 8, 2020, at 4:15 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> kb8tq at n1k.org said:
>> Same basic issue, lots of weird interactions and a need to keep the signal
>> very precise. Not as easy as it might seem. 
> 
> What does "precise" mean in that context?
> 
> I'm not an antenna-nut.  Can an antenna miss-match change anything other than 
> the amplitude?

Sure, it also changes phase ….


> 
> How do you automatically tune something like that?

Measure it and feed the result into a servo ….

>  The manual way would to 
> twist the knob while watching a meter.  If the meter goes down, you are going 
> the wrong way.  If it goes up, keep going until it starts going down, then 
> back up to the peak you just passed.
> 
> How do you even know that it needs tuning?  Can you measure something 
> accurately enough?  If so, what?

S11 back into the antenna if it’s an RX antenna. If it’s a transmit antenna SWR is the
normal thing to monitor ….

Bob

> 
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.