[Moon-net] EME antenna/amp advice

[Leif Asbrink]

Hello Kim,

> but only if the losses of the input circuit are extremely small, something 
> that can be
> achieved in case input selectivity is unimportant.
> 
> 
> YES, but it is NOT in practice !
?????????

> The Loss of of an input circuit and its eqvivalent contribution to the NF 
> itselves, can be calculated
> from the  NF itselves  PLUS the loss in the input LC !
> And according to the theory can this be calc. as the difference from the 
> loaded Q / unloaded Q  !
> 
> So its absolutely important to have  high unloaded Q and a low loaded Q !
Hmmm, would you not agree it is only important to have a very small 
ratio loaded Q / unloaded Q ?
What about extremely low loaded Q and "normal" unloaded Q? 

> So all in all, inputselectivity is  VY dependend of this relationship, so it 
> IS very important.
If we make the loaded Q = 3 (Equivalent to VERY poor input selectivity) by
having an extremely high L/C ratio we could have a modest unloaded
Q of only 300 and still have very low losses.

73

Leif / SM5BSZ