Poor Ham's Scalar Network Analyzer
https://groups.io/g/PHSNA
Information and discussion about a simple, low-cost scalar network analyzer (SNA) employing an Arduino micro controller, an inexpensive AD9850/51 DDS module, and an AD8307 RF power detector.<br /> <br /> All are welcome, but the moderator must approve new members.Tue, 17 Sep 2013 02:28:21 -0700Re: AD9851 Multiplier and Frequency Accuracy
https://groups.io/g/PHSNA/message/3003
Thank you for the information Clifford.<br />Alfredo Mendiola Loyola OA4AJPmendiola_loyola@... (Alfredo Mendiola Loyola)Sun, 26 May 2019 18:00:12 -0700Re: AD9851 Multiplier and Frequency Accuracy
https://groups.io/g/PHSNA/message/3002
Same frequency accuracy because that's locked to your source, but will have<br />some additional phase noise because that depends on the multiplication<br />method (the VCO, the phase comparator and the loop filter). The data sheet<br />will tell you more.<br /><br /><br />On Mon, 27 May 2019, 04:12 Alfredo Mendiola Loyola via Groups.Io<br /><mendiola_loyola=yahoo.com@groups.io> wrote:<br /><br /><blockquote>Hello,<br /><br />If I use a TCXO oscillator with a frequency accuracy of 1ppm with an<br />AD9851 which have activated the 6x Multiplier, will the multiplied<br />frequency have the same accuracy of 1ppm?<br /><br />Example:<br />Input: TCXO 10 Mhz with 1ppm<br />Output: AD9851 60 Mhz with X ppm<br /><br />Will the value of X be 1 ppm ?<br /><br />Regards<br />Alfredo<br />OA4AJP<br /><br /><br /><br /></blockquote>clifford.heath@... (Clifford Heath)Sun, 26 May 2019 15:35:10 -0700AD9851 Multiplier and Frequency Accuracy
https://groups.io/g/PHSNA/message/3001
Hello, <br /><br />If I use a TCXO oscillator with a frequency accuracy of 1ppm with an AD9851 which have activated the 6x Multiplier, will the multiplied frequency have the same accuracy of 1ppm?<br /><br />Example:<br />Input: TCXO 10 Mhz with 1ppm<br />Output: AD9851 60 Mhz with X ppm<br /><br />Will the value of X be 1 ppm ?<br /><br />Regards<br />Alfredo<br />OA4AJPmendiola_loyola@... (Alfredo Mendiola Loyola)Sun, 26 May 2019 11:12:36 -0700Re: Si570 Set Frequency
https://groups.io/g/PHSNA/message/3000
Ambrogio, <br /><br />The Arduino Sketch Worked with my si570 Circuit.<br />I had to use the i2c scanner to find the I2C address of the Si570.<br /><br />I'm including the picture Links:<br /><br /><a href="https://drive.google.com/open?id=1eaepnqMvr9jU9u9dDs_Uxtw8UiF0xC7R" target="_blank">https://drive.google.com/open?id=1eaepnqMvr9jU9u9dDs_Uxtw8UiF0xC7R</a><br /><a href="https://drive.google.com/open?id=1sHBZsVVM_Zjp2s6jpDltEgoaVwspGlh_" target="_blank">https://drive.google.com/open?id=1sHBZsVVM_Zjp2s6jpDltEgoaVwspGlh_</a><br /><br />The modified source code is in:<br /><a href="https://github.com/oa4ajp/Si570_v5" target="_blank">https://github.com/oa4ajp/Si570_v5</a><br /><br />Thank you for your help.<br />73<br />Alfredo Mendiola<br />OA4AJPmendiola_loyola@... (Alfredo Mendiola Loyola)Sat, 18 May 2019 19:26:38 -0700Re: MMIC Amplifier Bias calculation
https://groups.io/g/PHSNA/message/2998
If the inductor has a core material other than air, such as powdered iron<br />or ferrite (and it probably does), the DC current through it could saturate<br />the core material. That would cause the inductor to become non-linear or<br />have much lower than marked inductance.<br /><br />If you know the manufacturer and part number of the inductor you might be<br />able to look up what value of current would cause it to saturate. Otherwise<br />you could wind your own inductor on a toroid and use published values of<br />its properties to be sure you're avoiding saturation.<br /><br />73-<br /><br />Nick, WA5BDU<br /><br />On Fri, May 3, 2019 at 8:17 AM Alfredo Mendiola Loyola via Groups.Io<br /><mendiola_loyola=yahoo.com@groups.io> wrote:<br /><br /><blockquote>Good Morning,<br /><br />I'm using this calculator (<br /><a href="https://www.changpuak.ch/electronics/mar_era_bias.php" target="_blank">https://www.changpuak.ch/electronics/mar_era_bias.php</a>) to get the values<br />of<br />the Capacitors, Resistance and Inductor for my Minicircuits MAV-11BSM<br />amplifier.<br /><br />The calculator gives me a capacitor value of 68pF and an inductor of 1.6<br />uH.<br /><br />What I don't understand is this statement in the calculator:<br />*******************************************************************<br />" Make sure the inductance does not saturate at the current of operation "<br /><br />The calculated current is 60 mA, and the inductance calculated is 1.6uH.<br />How do I know if the inductor saturates at 60 mA of Current ?<br /><br /><br />Parameters:<br />**********<br /> Supply Voltage: 8<br /> Amp Type: MAV-11BSM<br /> Min Freq: 50 Mhz<br /><br />Output:<br />*******<br /> R = 41.67 Ohms<br /> L >= 1.592 uH<br /> C >= 0.0637 nf ( 64pF => 68pF) {Usar 0.1uF}<br /> P = 0.15W<br /> I = 60 mA<br /><br /><br /><br /></blockquote>kennnick@... (Nick Kennedy)Fri, 03 May 2019 08:50:00 -0700Re: MMIC Amplifier Bias calculation
https://groups.io/g/PHSNA/message/2997
I'm still designing the schematic before buyinh the components.<br />RegardsAlfredo Mendiola Loyolamendiola_loyola@... (Alfredo Mendiola Loyola)Fri, 03 May 2019 07:32:17 -0700Re: MMIC Amplifier Bias calculation
https://groups.io/g/PHSNA/message/2996
hi Alfredo,<br />is your si570 working well with the sketch ?<br />Just to know .<br />regards,<br />Ambro<br />iw2fvoambrogio.riboli@... (Ambro IW2FVO)Fri, 03 May 2019 07:25:19 -0700MMIC Amplifier Bias calculation
https://groups.io/g/PHSNA/message/2995
Good Morning, <br /><br />I'm using this calculator (<a href="https://www.changpuak.ch/electronics/mar_era_bias.php" target="_blank">https://www.changpuak.ch/electronics/mar_era_bias.php</a>) to get the values of <br />the Capacitors, Resistance and Inductor for my Minicircuits MAV-11BSM amplifier.<br /><br />The calculator gives me a capacitor value of 68pF and an inductor of 1.6 uH.<br /><br />What I don't understand is this statement in the calculator:<br />*******************************************************************<br />" Make sure the inductance does not saturate at the current of operation "<br /><br />The calculated current is 60 mA, and the inductance calculated is 1.6uH.<br />How do I know if the inductor saturates at 60 mA of Current ?<br /><br /><br />Parameters:<br />**********<br /> Supply Voltage: 8<br /> Amp Type: MAV-11BSM<br /> Min Freq: 50 Mhz<br /><br />Output:<br />*******<br /> R = 41.67 Ohms<br /> L >= 1.592 uH <br /> C >= 0.0637 nf ( 64pF => 68pF) {Usar 0.1uF} <br /> P = 0.15W<br /> I = 60 mAmendiola_loyola@... (Alfredo Mendiola Loyola)Fri, 03 May 2019 06:17:00 -0700Re: What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2994
No they are different in layout and pin arrangement . Same set of chips . <br /><br />73<br />DE AB9XC<br />(Pravin)<br /><br />--------------------------------------------nivar_p@... (Pravin)Fri, 26 Apr 2019 18:57:14 -0700Re: What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2993
And the "Type 1" "Type 2" designation is just someone's arbitrary designation, not an "official" one you will find on any of the sites selling the modules.vk5tm@... (Terry VK5TM)Fri, 26 Apr 2019 18:04:24 -0700Re: What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2992
Yes. I noted that some sites disagree on which is a Type I or Type II in the attached PDF.<br />Mike<br />K5ESSk5ess.nothdurft@... (K5ESS)Fri, 26 Apr 2019 16:05:51 -0700Re: What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2991
A quick word of warning,<br /><br />There is SoftwareControledHamRadio.io group who have an Antennae<br />Analyser that uses the same modules but who have numbered them oppositely.<br /><br /><br />Cheers,<br /><br />Will<br /><br />ZL1TAOzl1tao@... (William Kimber)Fri, 26 Apr 2019 15:52:49 -0700Re: What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2990
Many thankssoftfoot@... (David Slipper)Fri, 26 Apr 2019 13:28:34 -0700Re: What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2989
Dave,<br />They are different modules. Either might have either AD9850 or AD9851 DDS chips. See the attached file. The file also shows an adapter board that can be used when needed. The modules are becoming rather expensive particularly the Type I (three rows of seven pins).<br />Mike<br />K5ESSk5ess.nothdurft@... (K5ESS)Fri, 26 Apr 2019 12:44:03 -0700What is the difference between a DDS Type 1 and Type 2 ??
https://groups.io/g/PHSNA/message/2988
Are they different modules or chips ??<br /><br />Rgds<br />Davesoftfoot@... (David Slipper)Fri, 26 Apr 2019 10:09:22 -0700New to group
https://groups.io/g/PHSNA/message/2987
Hello all.<br /><br />I am very interested in this project.<br /><br />Davesoftfoot@... (David Slipper)Fri, 26 Apr 2019 07:16:11 -0700Re: Si570 LVDS Output Impedance
https://groups.io/g/PHSNA/message/2986
On 23 Apr 2019, at 11:12 am, Alfredo Mendiola Loyola via Groups.Io <mendiola_loyola=yahoo.com@groups.io> wrote:<br /><blockquote>I will use a 1:4 transformer with center tap to connect the output of the si570 (LVDS).<br />The secondary of the transformer (Center Tap) will be connected to the differential outputs of the si570<br />The primary of the transformer will be connected to a 3dB PI attenuator to get 50 ohm at the input and output of the attenuator.<br /><br />The si570 datasheet states that the LVDS model has an output of 0.7 vpp {swing (diff)}<br /><br />If I use a 1:4 transformer (Coilcraft PWB-4-BL) what will be the output peak to peak voltage at the transformer Primary?</blockquote>1:4 impedance is 1:2 voltage ratio. 0.7Vp-p would reduce by 2:1 to 0.35Vp-p, which is 0.12Vrms.<br />Into 50 ohms that's about -5dBm.<br /><br />Clifford Heath.clifford.heath@... (Clifford Heath)Tue, 23 Apr 2019 03:39:56 -0700Re: Si570 LVDS Output Impedance
https://groups.io/g/PHSNA/message/2985
Hello,<br /><br />I will use a 1:4 transformer with center tap to connect the output of the si570 (LVDS).<br />The secondary of the transformer (Center Tap) will be connected to the differential outputs of the si570<br />The primary of the transformer will be connected to a 3dB PI attenuator to get 50 ohm at the input and output of the attenuator.<br /><br />The si570 datasheet states that the LVDS model has an output of 0.7 vpp {swing (diff)}<br /><br />If I use a 1:4 transformer (Coilcraft PWB-4-BL) what will be the output peak to peak voltage at the transformer Primary?<br /><br />73.<br />Alfredo Mendiola Loyola<br />OA4AJPmendiola_loyola@... (Alfredo Mendiola Loyola)Mon, 22 Apr 2019 18:12:48 -0700Re: Si570 LVDS Output Impedance
https://groups.io/g/PHSNA/message/2984
For that purpose, I'd try to assure 50 ohms by following the output with an<br />attenuator. I wouldn't assume a specific source resistance internal to the<br />Si570.<br /><br />Another issue if you're trying to use the si570 in a signal generator type<br />of application is that the Si570 has a square wave output. However, if as<br />you say you are interested in a single channel use, you can LPF that signal<br />into a sine wave.<br /><br />73-<br /><br />Nick, WA5BDU<br /><br /><br />On Mon, Apr 22, 2019 at 6:28 AM Alfredo Mendiola Loyola via Groups.Io<br /><mendiola_loyola=yahoo.com@groups.io> wrote:<br /><br /><blockquote>Hello:<br /><br />My goal is to get a single channel output with exactly 50 ohms impedace.<br /><br />By using a transformer 1:4 if the outputs of the si570 doesn't have<br />exactly 50 ohm I will get at the output of the transformer an impedace<br />higher or lower than 50 ohm.<br /><br />I'm working with UHF sgnales 430 mhz.<br /><br />73<br />Alfredo.<br />OA4AJP<br /><br /><br /><br /></blockquote>kennnick@... (Nick Kennedy)Mon, 22 Apr 2019 05:42:27 -0700Re: Si570 LVDS Output Impedance
https://groups.io/g/PHSNA/message/2983
Hello:<br /><br />My goal is to get a single channel output with exactly 50 ohms impedace.<br /><br />By using a transformer 1:4 if the outputs of the si570 doesn't have exactly 50 ohm I will get at the output of the transformer an impedace higher or lower than 50 ohm.<br /><br />I'm working with UHF sgnales 430 mhz.<br /><br />73<br />Alfredo.<br />OA4AJPmendiola_loyola@... (Alfredo Mendiola Loyola)Mon, 22 Apr 2019 04:28:11 -0700