Hello,
Thanks for all answers
I have to say that the replays are varied and I don't have much time at the moment so I will read them correctly tomorrow. But I should say that there is no worry about the receiver( I need to build a proper transmitter which could be able to work at human hearing range). I should say it seems there is no problem using VSB too, because we can get a reasonable bandwidth rather than DSB...
Thanks
P.s no digita not FPGA..
"John Woodgate"
** So easy in fact, even I managed to design one.See ABSE for "20kHz Outphaser Schem ".
( Shame Adam the Google Groper will not be able)
U1 and U2 = TL074
Rs and Cs = 1% tolerance ( excepting C1)
Phase offset ( R68 -R69) = 90 degrees +/- 2 degrees, 18 Hz to 21 kHz.
...... Phil
What is ABSE, please? I would like a look at this schematic if that's possible.
"Don Foreman"
** A usenet group:" alt.binaries.schematics.electronic "
Unfortunately, some news severs do not include binary groups their list.
........ Phil
E4440A or similar with a TG.
Regards Ian
;-)
Phil Allison =D9=86=D9=88=D8=B4=D8=AA=D9=87 =D8=A7=D8=B3=D8=AA:
th
z=2E
Hey Man, where is IT? I spend 1 houre to find it but with no success?
Don Foreman =D9=86=D9=88=D8=B4=D8=AA=D9=87 =D8=A7=D8=B3=D8=AA:
ith
Hz.
"Don Foreman ""
could you find the circuit?
The widest band Hilbert I have seen( using Op amps as a Hilber filter) is 5kHz, so I am too eager to see the new circuit Phil is talking about
In message , dated Wed, 30 Aug 2006, Adam writes
It's ABSE-NT. Unfortunately, a lot of graphics sent to ABSE never make it. I suspect that some text has to be present in the article, otherwise some servers won't relay it.
This means that if you have your software set to automatically split the article into two or more parts, only one or some will come through.
-- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
In message , dated Wed, 30 Aug 2006, Adam writes
It's only a matter of adding as many all-pass filter sections as you need to meet the accuracy of the quadrature relationship. One insidious error is to require extreme precision, which multiplies the number of sections. 1 degree error causes the unwanted sideband **at that frequency** to be suppressed by approximately 35 dB instead of infinitely.
-- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
alt.binaries.schematics.electronic
Cheers,
Phil Hobbs
alt.binaries.schematics.electronic
Cheers,
Phil Hobbs
But it's not there.
Phil, can you please put it on a web page and give us the URL?
-- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
"John Woodgate"
** Well - it actually IS there and a poster called "Joel Kolstad" has replied. ** Would if I could.I will repost it to ABSE now, for luck.
...... Phil
I see what looks like a scanned schematic with the bottom half, and some offpage connections, missing. Could you please repost with the whole thing shown?
John
"John Larkin"
** The " whole thing " is shown.A complete, full audio band, 90 degree outphaser.
I'll let you just guess the rest.
...... Phil
In message , dated Wed, 30 Aug 2006, John Woodgate writes
OK, no need; it's arrive now. Here, at least.
-- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
What I'm guessing is that it was scanned from a magazine.
John
I did, thanks.
It's straightforward. This approach was first documented in a paper many years ago. It was by a guy at Sanders but I can't recall his name just now. I built one back when the 741 was the best opamp available. I think it was within 5 degrees over a decade or so, which was all I needed. I was discriminating between USB and LSB in a Doppler radar intrusion detector to discriminate between approaching targets and receding targets. Got a patent on that, but it was prior to 1976 so it no longer appears in a USPTO search unless one knows the number -- which of course I've long since forgotten. I could probably find it if anyone is interested.
Historic note: the first Heathkit (tube type) FM stereo tuner (early '60s) used a phasing approach. It wasn't very good. The contemporary Dynakit was much better.
Phil Allison =D9=86=D9=88=D8=B4=D8=AA=D9=87 =D8=A7=D8=B3=D8=AA:
Sorry but I could not to find it, I found the usenet but could not to find what you reffered to?! my connection is so slow so at the moment so I can not make more search. Can anyone upload it and put the link here please?
Thanks
r with
1 kHz.Hi Don Foreman.
?WooW I would like talk to you via Email Please
Did you use "beamforming" for your radar too??
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