Re: [time-nuts] DIY VNA design

Hi Dave: I worked on the HP/Agilent 4380S test system software. The 4380A test set has 8 ports and 3 receivers (R, A & B) as well as a built-in Short - Open - Load to speed up the calibration. Uses bridges. http://www.prc68.com/I/4395A.shtml#4380 Used for measuring both ends of CAT5 cable

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

On Mon, 22 Aug 2016 23:56:12 -0700 Hal Murray wrote: > att...@kinali.ch said: > > Is there any advantage of using groups.io compared to a traditional > > mailinglist? If not, I would prefer a traditional mailinglist. But maybe I > > am just oldfashioned :-) > > The

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

att...@kinali.ch said: > Is there any advantage of using groups.io compared to a traditional > mailinglist? If not, I would prefer a traditional mailinglist. But maybe I > am just oldfashioned :-) The obvious advantage is that there is a professional staff keeping things running so you don't

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

On Mon, 22 Aug 2016 23:44:17 +0200, you wrote: >On Mon, 22 Aug 2016 14:20:59 -0400 >Bob Bownes wrote: > >> Just finished creating it at groups.io >> >> *https://groups.io/g/svna * >> and sign up. :) > >Is there any advantage of using groups.io compared

Re: [time-nuts] DIY VNA design

On 8/22/16 5:01 PM, Richard (Rick) Karlquist wrote: On 8/21/2016 3:59 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: That said, I don't know why the author is using directional couplers. A bridge is much wider bandwidth. It is more lossy though. In general, a resistive bridge will

Re: [time-nuts] DIY VNA design

The intersection of HP equipment && Time-Nuts && VNWA mailing lists is >> At least two ;^) Jim n8qoh ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] DIY VNA design

On 8/21/2016 3:59 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: That said, I don't know why the author is using directional couplers. A bridge is much wider bandwidth. It is more lossy though. In general, a resistive bridge will always require a transformer/180 degree

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

I also prefer old-style e-mail-only mailing lists. Fortunately, you can subscribe to a groups.io mailing list via e-mail. Just send “SUBSCRIBE" in the body to svna+subscr...@groups.io Thanks, David Slik VE7FIM On Mon, Aug 22, 2016 at 3:08 PM, Wes wrote: > I agree. > > On

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

I agree. On 8/22/2016 2:44 PM, Attila Kinali wrote: On Mon, 22 Aug 2016 14:20:59 -0400 Bob Bownes wrote: Just finished creating it at groups.io *https://groups.io/g/svna * and sign up. :) Is there any advantage of using groups.io compared to a

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

On Mon, 22 Aug 2016 14:20:59 -0400 Bob Bownes wrote: > Just finished creating it at groups.io > > *https://groups.io/g/svna * > and sign up. :) Is there any advantage of using groups.io compared to a traditional mailinglist? If not, I would prefer a

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

in-DFW" <li...@ozindfw.net> > To: <time-nuts@febo.com> > Sent: Monday, August 22, 2016 11:53 AM > Subject: Re: [time-nuts] DIY VNA design [VNA-Nuts?] > > > > So is it time for VNA-Nuts? I can probably host it. >> >> -- >> m

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

Maybe do it on Mewe.com? - Original Message - From: "Oz-in-DFW" <li...@ozindfw.net> To: <time-nuts@febo.com> Sent: Monday, August 22, 2016 11:53 AM Subject: Re: [time-nuts] DIY VNA design [VNA-Nuts?] So is it time for VNA-Nuts? I can probably host it. -- mail

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

So is it time for VNA-Nuts? I can probably host it. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] DIY VNA design, directional coupler

Alexander wrote: there is a current mode feedback device [which does not follows the gain bandwidth product role ] and has 1000V/usec rise time 92dB THD at 30MHz 3nV/rtHz noise Yeah, but look at its 1/f input voltage noise corner -- it's at 2 or 3 MHz!!! So the baseband input noise density

Re: [time-nuts] DIY VNA design

On 22 August 2016 at 02:51, bownes wrote: > > Comment inline > > > > On Aug 21, 2016, at 18:59, Dr. David Kirkby (Kirkby Microwave Ltd) < > drkir...@kirkbymicrowave.co.uk> wrote: > > > > I am not convinced that this is time-nuts related, although I am sure > many > > time-nuts

Re: [time-nuts] DIY VNA design

Hi If you really want to work out the delays through all of this GPS "stuff" ahead of the RF -> PPS conversion, a VNA is about the only good way to do it. Bob > On Aug 21, 2016, at 6:59 PM, Dr. David Kirkby (Kirkby Microwave Ltd) > wrote: > >> On 21 Aug 2016

Re: [time-nuts] DIY VNA design

Comment inline > On Aug 21, 2016, at 18:59, Dr. David Kirkby (Kirkby Microwave Ltd) > wrote: > > I am not convinced that this is time-nuts related, although I am sure many > time-nuts either have a VNA or would like one. Such a project needs its own > forum.

Re: [time-nuts] DIY VNA design

Hi One option in the "1 GHz and down" range is to team up a surplus HP S-Parameter test set with your own electronics. That way you let HP do all of the fancy directional coupler stuff and relays. They don't sell well on the auction sites. The result is that a bit of time making lowball offers

Re: [time-nuts] DIY VNA design

On 21 Aug 2016 03:19, "Attila Kinali" wrote: > > Moin, > > I stumbled over a new open hardware/source VNA design: > http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html > > Unlike other designs out there, this one is very well done and has very > little

Re: [time-nuts] DIY VNA design, directional coupler

there is a current mode feedback device [which does not follows the gain bandwidth product role ] and has 1000V/usec rise time 92dB THD at 30MHz 3nV/rtHz noise, see here http://www.ti.com/lit/ds/symlink/ths4271.pdf, I used it as a medical color Doppler application Guanella's choke and

Re: [time-nuts] DIY VNA design, directional coupler

On Sun, 21 Aug 2016 10:04:10 -0700 Alex Pummer wrote: > directional coupler/circulator could be made with high bandwidth [ up to > 1GHz ] operational amplifiers, that circulator will work from DC.. While this is a valid option, it would then become the element in the system

Re: [time-nuts] DIY VNA design

I built an original N2PK, that interfaced via a parallel port. I did a minor upgrade that changed to an improved DAC. I still have a Win XP laptop with a parallel port so can still use it. Later it was refined to USB but I never upgraded, although I still have the unpopulated circuit boards

Re: [time-nuts] DIY VNA design, directional coupler

directional coupler/circulator could be made with high bandwidth [ up to 1GHz ] operational amplifiers, that circulator will work from DC.. driving A/D converter input asymmetrically; drive trough a Guanella-choke, but match the output of the choke 73 Alex On 8/21/2016 3:21 AM, Attila

Re: [time-nuts] DIY VNA design

On Sun, 21 Aug 2016 04:46:10 + (UTC) Bob Albert via time-nuts wrote: > I was interested in this, but my needs are mostly below 100 MHz. > I wonder what could be done similarly for this lower range... As Orin mentioned, there are some designs for that range out there,

Re: [time-nuts] DIY VNA design

[] To 500MHz, lower dynamic range to 1.3GHz: http://sdr-kits.net/VNWA3_Description.html OK, so the latter isn't build it yourself anymore. I have version 2.6 of the latter and it works really well to about 575MHz. Traces can get noisy after about 575MHz. Remember these VNAs are only as good as

Re: [time-nuts] DIY VNA design

Well that's a start.  Thanks for the link!  I would need more information, as this project goes into areas that are new to me.  And there is no clue as to the cost of construction. But I'll study what's there and if nothing else, learn something. Bob On Saturday, August 20, 2016 10:46 PM,

Re: [time-nuts] DIY VNA design

To 60MHz: http://n2pk.com; PCBs available here: http://www.makarov.ca/vna.htm To 500MHz, lower dynamic range to 1.3GHz: http://sdr-kits.net/VNWA3_Description.html OK, so the latter isn't build it yourself anymore. I have version 2.6 of the latter and it works really well to about 575MHz. Traces

Re: [time-nuts] DIY VNA design

I was interested in this, but my needs are mostly below 100 MHz.  I wonder what could be done similarly for this lower range... Bob On Saturday, August 20, 2016 8:54 PM, Richard (Rick) Karlquist wrote: Another great posting, Attila. When I was with Agilent, we

Re: [time-nuts] DIY VNA design

Another great posting, Attila. When I was with Agilent, we looked at all kinds of simplified network analyzer architectures, and I would have to say the author is really well informed. One issue he doesn't seem to be aware of is that the ADL5801, when driven single ended, has some quirks below

[time-nuts] DIY VNA design

Moin, I stumbled over a new open hardware/source VNA design: http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html Unlike other designs out there, this one is very well done and has very little room for improvement, without increasing the price considerably. About the