Hopefully that we will remember that the DSP filter skirts are steeper
than the crystal filter skirts, so judicious use of the HiCut and LoCut
will provide us with a better passband than narrow roofing filters.
What the roofing filters will do is keep the receiver from reducing the
hardware AGC for stations which are within the roofing filter passband.
It takes adjacent signals in excess of S-9 +30 for the adjacent signal
to activate the hardware AGC (which protects the front end DAC from
overload). If the interfering station does not exceed that threshold,
then the DSP filters will take care of it, and the need for more narrow
roofing filters is superfluous.
73,
Don W3FPR
On 3/31/2020 8:57 PM, Bob McGraw K4TAX wrote:
Remember, different brands of 2.1 or 1.8 filters are not necessarily equal.
One must realize the shape factor is more important than the published BW.
Just because one radio filter is 1.8 kHz does not mean another 1.8 kHz BW is
the same.
Bob, K4TAX
Sent from my iPhone
On Mar 31, 2020, at 7:02 PM, Nate Bargmann <[email protected]> wrote:
I typically use Hi Cut the most, Lo Cut once in a while and almost never
use Width in SSB mode. For me the 2.1 kHz filter works swell in this
application.
In the late '90s I bought a TS-850s which was fitted with a 1.8 kHz
factory accessory filter. I couldn't get rid of it fast enough and
outfitted the radio with Inrad 2.1 kHz filters. They were far more
pleasing to me.
73, Nate, N0NB
--
"The optimist proclaims that we live in the best of all
possible worlds. The pessimist fears this is true."
Web: https://www.n0nb.us
Projects: https://github.com/N0NB
GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
