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Re: [TenTec] notch filter for Eagle?

To: tentec@contesting.com
Subject: Re: [TenTec] notch filter for Eagle?
From: Joe Papworth via TenTec <tentec@contesting.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 20 Jul 2017 11:54:16 -0400
List-post: <mailto:tentec@contesting.com>
Thanks Rick.

Sent from AOL Mobile Mail


-----Original Message-----
From: rick@dj0ip.de <Rick@DJ0IP.de>
To: 'Discussion of Ten-Tec Equipment' <tentec@contesting.com>
Sent: Thu, Jul 20, 2017 11:21 AM
Subject: Re: [TenTec] notch filter for Eagle?


My answer:  
... Never in a contest
... Never in CW since I have an auto-notch
... Occasionally on SSB rag chew it is a big help

73
Rick, DJ0IP

-----Original Message-----
From: TenTec [<a 
href="mailto:tentec-bounces@contesting.com?";>mailto:tentec-bounces@contesting.com</a>]
 On Behalf Of Joe Papworth via TenTec
Sent: Thursday, July 20, 2017 4:36 PM
To: <a href="mailto:tentec@contesting.com";>tentec@contesting.com</a>
Cc: <a href="mailto:k8mp@aol.com";>k8mp@aol.com</a>; <a 
href="mailto:oldlongbeard@yahoo.com";>oldlongbeard@yahoo.com</a>
Subject: Re: [TenTec] notch filter for Eagle?

Quick poll:
How often do those on the list actually need or use your notch filters?

Most of my QSOs are CW contest QSOs. 
Many times the bands are so crowded that a ginsu knife would come in handy and 
yet I rarely need the notch filter.

I'm just curious...

Later, Joe, K8MP

Sent from AOL Mobile Mail


-----Original Message-----
From: Dukes HiFi <<a 
href="mailto:dukeshifi@comcast.net";>dukeshifi@comcast.net</a>>
To: Discussion of Ten-Tec Equipment <<a 
href="mailto:tentec@contesting.com";>tentec@contesting.com</a>>
Cc: Greg S <<a href="mailto:oldlongbeard@yahoo.com";>oldlongbeard@yahoo.com</a>>
Sent: Thu, Jul 20, 2017 10:21 AM
Subject: Re: [TenTec] notch filter for Eagle?


Rick:

Since your SDR has notch inside the AGC loop, it must not be all that difficult 
to accomplish. Of course, I do not have sufficient knowledge of SDR designs to 
know how they manage AGC or notch functions.

Too bad no one is writing software for the Orion anymore. It would be nice if 
that change could be done. I might even buy one then...

I should have added the caveat in my remark regarding the relative uselessness 
of a notch filter outside the AGC line by saying “useless to ME”. Others are 
certainly free to believe that an external notch filter (that is, external to 
the AGC loop)  is equally effective (manual or otherwise).

This topic was beaten to death maybe 30 to 40 years or so ago when relatively 
decent external filters, such as the Autek and later on when DSP devices were 
introduced. They were pitched as offering Collins or Drake-like performance in 
otherwise mediocre receivers. They didn’t, but they did make operation less 
annoying to some degree. They also worked pretty well if you turned off the AGC 
and used the RF gain pot to compensate for variations in signal strength.

Gary

PS: Icom is the leader here in direct SDR, FOR ME. The performance is not there 
yet but I have zero interest in needing to have my PC on to run my radio. The 
7300 does not need a PC to work, the others do. They are headed in the right 
direction. If Ten Sec ever introduces a new radio, likely it will head in that 
direction too.

> On Jul 20, 2017, at 7:08 AM, <a href="<a 
> href="mailto:rick@dj0ip.de";>rick@dj0ip.de</a?">mailto:rick@dj0ip.de";>rick@dj0ip.de</a</a>>
>  <<a href="<a 
> href="mailto:Rick@DJ0IP.de";>Rick@DJ0IP.de</a?">mailto:Rick@DJ0IP.de";>Rick@DJ0IP.de</a</a>>>
>  wrote:
> 
> notch

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