I read/post via email, rarely look at the web interface and just learned that posts are moderated. I've never noticed that; I learned something today, thanks. Sure, they could, but how would that

Thank you for asking. Let me preface the following by explaining the environment. The antenna is a 55 foot vertical over ground radials, For the results that follow, the antenna is connected to the

Of course it's moderated. It says so every time I post. Whatever, they could just identify themselves.

Yes, the visible signal is certainly generated by interstellar material belonging to our galaxy.

Is this list moderated? I didn't think so. If you're not keen on asking them, the slightest bit of search engine use reveals full names for both Youssef and Joanne, if that helps at all. I do not

Let's be more pragmatic. What is the real world performance using an antenna?

Well, let me be blunt and see if my comments get past the moderator. First, I feel a distinct disadvantage because I don't know who I'm discussing this with. Two of you hide behind screen names but

SWR.

You are definitely receiving Hydrogen line emissions from within this galaxy. Since M31 is moving relative to us I would think you would need to look about 3 MHz higher or lower to see Hydrogen line

I didn't state any reasons, I asked a question that you, as I anticipated, didn't care to answer.

I am selling a version of Dallas Lankford’s Push Pull Norton amplifier. Currently there are no commercial manufactures of Norton amplifiers, so I deceived to design a printed circuit board for the

I tried receiving the hydrogen line in the direction of M31 but I can't solve the signal, evidently the s / n ratio is still low. The first image in the frequency domain, the second in the speed

{^_-}

With antennas suitable for efficient transmitting 10 dB is generally safe through 15 MHz maybe 28 MHz. With poor antennas - well - if you install an attenuator and the noise still rises when you

Better filters are always better, of course, but definitely not for the reasons you are stating. I would again oprimize for the MDS and the rejection. Yes, designing receivers is not as intuitive as

If a perfectly resistive load is required for something else other than reception, just add attenuators. This will cost you the valuable MDS we fought to get you here, but I'd assume at this point you

Since it doesn't appear to me that there is enough room in this package for many Ls and Cs how (if you care to say) do you build these elaborate filters? Are these active inductors?

Well, for what it is worth I will reiterate what Youssef said. In general the input match on the receiver does not matter. In specific, however, there is an issue with filters attached to the input

It's easier to get good matching over half an octave than two or three octaves.

Maybe you've said elsewhere that SWR doesn't matter, but I've not seen it in this thread. Nevertheless, I generally agree, until you get to VHF where transmission line loss increases due to SWR can