[TenTec] notch filter for Eagle?

Dukes HiFi dukeshifi at comcast.net
Thu Jul 20 10:21:28 EDT 2017


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.


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, rick at dj0ip.de <Rick at DJ0IP.de> wrote:
> notch

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