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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
Dana Myers
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#32558
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
Wes Stewart <n7ws@...>
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#32557
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
Of course it's moderated. It says so every time I post. Whatever, they could just identify themselves.
Of course it's moderated. It says so every time I post. Whatever, they could just identify themselves.
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By
Wes Stewart <n7ws@...>
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#32556
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Re: AstroSpy
#1420mhz
#21cm
#radioastronomy
Yes, the visible signal is certainly generated by interstellar material belonging to our galaxy.
Yes, the visible signal is certainly generated by interstellar material belonging to our galaxy.
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By
iz5dkm@...
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#32555
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
Dana Myers
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#32554
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
Let's be more pragmatic. What is the real world performance using an antenna?
Let's be more pragmatic. What is the real world performance using an antenna?
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By
prog
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#32553
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
Wes Stewart <n7ws@...>
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#32552
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
SWR.
By
prog
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#32551
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Re: AstroSpy
#1420mhz
#21cm
#radioastronomy
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
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
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By
Daniel Fox
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#32550
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
I didn't state any reasons, I asked a question that you, as I anticipated, didn't care to answer.
I didn't state any reasons, I asked a question that you, as I anticipated, didn't care to answer.
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By
Wes Stewart <n7ws@...>
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#32549
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Lankford Push Pull Norton Amplifiers
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 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
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By
Everett N4CY
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#32548
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Re: AstroSpy
#1420mhz
#21cm
#radioastronomy
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
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
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By
iz5dkm@...
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#32547
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
{^_-}
By
jdow
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#32546
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
jdow
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#32545
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
prog
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#32544
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
prog
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#32543
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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?
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?
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By
Wes Stewart <n7ws@...>
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#32542
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
jdow
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#32541
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
It's easier to get good matching over half an octave than two or three octaves.
It's easier to get good matching over half an octave than two or three octaves.
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By
prog
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#32540
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Re: Transmission lines, Input match and Connectors
#bestpractice
#experiment
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
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
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By
Wes Stewart <n7ws@...>
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#32539
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