[amsat-bb] NO84 in safe mode
zmetzing at pobox.com
Tue Jun 11 17:15:14 UTC 2019
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
> I've been away from Amateur Radio for quite some time and I feel that
> advances in the field are passing me by.
There is much information available to catch up on recent (and not so
recent) advances. The author of Linrad has done some dynamic range
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.
More information about the AMSAT-BB