reciver

[ma330]

hello
Please help a 50-ohm antenna.
And give your opinion about this recivers.Which is more efficient?

[WM6]

He messy64, please stop pollute this forum with new and new nick-name desperate spamming for help.

Answer: it depend on how you build your antenna.
First one is suitable in first line for stationary antenna, second one for portable.

[Seden]

It is good to see someone building a receiver that doesn't use a comparator connected to a signal generator. Alot happens between a 1 and the 0 that these guy's aren't considering so you are smart in using this design. One thing that would make it more sensitive is to add a Local Oscillator and a mixer in the front end like a CW receiver or SSB.

R.S.S.

[ma330]

Originally Posted by WM6

He messy64, please stop pollute this forum with new and new nick-name desperate spamming for help.

Who mesy64?
I read your posts on other threads for mesy64.I do not know who is and who is registered with a different user name.I am sorry for you that you judge.carl knows me.I was a member of the 2006 geotech forum.Even before you join in this forum.ut I had problems two years ago did not come to this forum.Today, long after I came back to this forum. And even a problem for me was the time for solved by carl.Mesy64 do not know if you or anyone else who has created a disturbance of the administrator, ask him to block IP.tank you for answer and I'm sorry for you. Please edit your posts

[WM6]

Hi ma330,

no problem, we all love messy64.

[ma330]

Originally Posted by WM6

Hi ma330,

no problem, we all love messy64.

tank you
Please edit your post 2

[WM6]

Originally Posted by ma330

tank you
Please edit your post 2

Done. As you can see post #2 was addressed to messy64 not to you.

So you can use rest of those message only, if you find something usable of course.

[ma330]

Originally Posted by WM6

Done. As you can see post #2 was addressed to messy64 not to you.

So you can use rest of those message only, if you find something usable of course.

ok
tanks

[ionios]

Hello, I also like to ask you about this schematic, if some body can
give more informations about the antenna,
How many turns there are in round ferrite?
And what antenna it is 50 ohm a ferrite antenna?
Is it posibile one good schematic only with the antenna?
Thank you very much.

[ma330]

Originally Posted by ionios

Hello, I also like to ask you about this schematic, if some body can
give more informations about the antenna,
How many turns there are in round ferrite?
And what antenna it is 50 ohm a ferrite antenna?
Is it posibile one good schematic only with the antenna?
Thank you very much.

hi
told wm6:
First one is suitable in first line for stationary antenna

[WM6]

Originally Posted by ma330

hi
told wm6:
First one is suitable in first line for stationary antenna

Yes, stationary, mean not suit your needs to build pistol like portable receiver - and 50 Ohm mean impedance (not resistance) of antenna. This can be wire or coil antenna.

Second schematic (with ferrite antenna) can suit your needs better.

To cover frequency range from 10 kHz to 60 kHz using this variable capacitor:

http://www.stormwise.com/page3.htm

you need ferrite antenna with an inductance of 650mH.

[Fred]

Originally Posted by Seden

It is good to see someone building a receiver that doesn't use a comparator connected to a signal generator. Alot happens between a 1 and the 0 that these guy's aren't considering so you are smart in using this design. One thing that would make it more sensitive is to add a Local Oscillator and a mixer in the front end like a CW receiver or SSB.

R.S.S.

Don´t you think this will give very similar results ?

[Seden]

Fred,

As someone who has compared various receivers for weak signal detection, adding an LO+mixer (product detector) greatly enhances weak carriers over an A.M. detection scheme.

Get a copy of a book called: Communication Receivers By Ulrich Rhode or another one I like is: Single Sideband System and Circuits by William Sabin.

Randy Seden-WD6ELU
Licensed since 1970