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ma330

01-08-2012 03:32 PM

reciver

2 Attachment(s)

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

WM6	01-08-2012 10:20 PM

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

01-09-2012 12:00 AM

reciver

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

01-09-2012 05:40 AM

2 Attachment(s)

Quote:

Originally Posted by WM6 (Post 141347)

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

Who mesy64?:nono:
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:nono:.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:nono::(

WM6	01-09-2012 07:47 AM

Hi ma330,

no problem, we all love messy64.

ma330

01-09-2012 07:58 AM

Quote:

Originally Posted by WM6 (Post 141350)

Hi ma330,

no problem, we all love messy64.

tank you
Please edit your post 2

WM6	01-09-2012 08:07 AM

Quote:

Originally Posted by ma330 (Post 141351)

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

01-09-2012 08:58 AM

Quote:

Originally Posted by WM6 (Post 141352)

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

01-09-2012 07:26 PM

http://www.longrangelocators.com/for...1&d=1326040242
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

01-09-2012 07:41 PM

Quote:

Originally Posted by ionios (Post 141356)

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

WM6	01-09-2012 09:52 PM

Quote:

Originally Posted by ma330 (Post 141357)

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	01-10-2012 03:30 PM

Quote:

Originally Posted by Seden (Post 141348)

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 ? :D

Seden

01-12-2012 04:28 AM

Receiver

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

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