[600MRG] JT9 Newbee Question

[Edward R Cole]

Paul,

Short answer - NO.  JT sw sets bandwidth in the digital domain after 
RF is converted to "bits".  DSP filters are way better and usually 
have steeper skirts.  But if you have strong carriers near in 
frequency they can affect gain stages and AGC so that is why radios 
have mechanical filters to act as "roof filters".

Lightening crashes are wideband noise but often strong enough to 
affect AGC.  I would guess a NB helps with them, but maybe not. I do 
not get them up here in coastal AK so not very experienced in 
reducing them.  On some HF bands lightening noise (crashes) are 
propagated by the ionosphere.  I wonder if turning AGC to fast or 
even off would help?

My antenna is down for now.  New lawn last summer required removal of 
ground plane (which I get to install once ground thaws (about June1st).

73, Ed - KL7UW
K3+100w NDB+Invert-L


At 10:27 AM 4/16/2020, Paul Signorelli wrote:
>Content-Language: en-US
>Content-Type: multipart/alternative;
> 
>boundary="_000_CY4PR01MB2229877C9C37271D780CE36EB6D80CY4PR01MB2229prod_"
>
>Does it help to narrow down my receiver bandwidth for the JT9 band?
>Or does the software ignore all those static crashes anyway?
>Paul   w0rw
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com