[amsat-bb] NO84 in safe mode

[Zach Metzinger]

On 2019-06-11 00:00, Phil via AMSAT-BB wrote:
> Thank you Ryan and Scott for your replies. I'm surprised that the RSP1 
> is more sensitive than the FT-817, which I bought when they first became 
> available.
> 
> I've been away from Amateur Radio for quite some time and I feel that 
> advances in the field are passing me by.

Phil-

There is much information available to catch up on recent (and not so 
recent) advances. The author of Linrad has done some dynamic range 
comparisons:

https://www.youtube.com/watch?v=QbSa1G14Nig

Note that a receiver that is too sensitive may be easily overloaded by a 
strong signal, requiring an attenuator proceeding it and resulting in an 
increase in noise figure.

A less sensitive receiver that performs better on the "top end" when 
strong signals are present can be helped out with a switchable LNA at 
the antenna. Which is, of course, where the LNA should be to set the 
system noise figure. No strong signals and you need some more 
sensitivity, switch on the LNA.

https://youtu.be/_-AkINSPkhw?t=505

--- Zach
N0ZGO