Check that you get the right impedance ratio - remember that it is the square of the turns ratio. I haven't checked the data sheet to see if the Si570 output is DC (ground) referenced. If not, I

The Si570 data sheet says: "Available LVPECL, CMOS, LVDS, and CML outputs". So the correct output coupling depends on which one you use. LVPECL (fastest) requires 50 ohms termination to

please see this document :> https://www.sdr-kits.net/documents/PA0KLT_Manual.pdf and look at fig. 7 on page 13/21 for impedance / transformer connections. I am using the Si570 as a VFO for my

Hello: My goal is to get a single channel output with exactly 50 ohms impedace. 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

For that purpose, I'd try to assure 50 ohms by following the output with an attenuator. I wouldn't assume a specific source resistance internal to the Si570. Another issue if you're trying to use the

Hello, I will use a 1:4 transformer with center tap to connect the output of the si570 (LVDS). The secondary of the transformer (Center Tap) will be connected to the differential outputs of the

1:4 impedance is 1:2 voltage ratio. 0.7Vp-p would reduce by 2:1 to 0.35Vp-p, which is 0.12Vrms. Into 50 ohms that's about -5dBm. Clifford Heath.

Hello all. I am very interested in this project. Dave

Are they different modules or chips ?? Rgds Dave

Dave, 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

Many thanks

A quick word of warning, There is SoftwareControledHamRadio.io group who have an Antennae Analyser that uses the same modules but who have numbered them oppositely. Cheers, Will ZL1TAO

Yes. I noted that some sites disagree on which is a Type I or Type II in the attached PDF. Mike K5ESS

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.

No they are different in layout and pin arrangement . Same set of chips . 73 DE AB9XC (Pravin) --------------------------------------------

Good Morning, I'm using this calculator (https://www.changpuak.ch/electronics/mar_era_bias.php) to get the values of the Capacitors, Resistance and Inductor for my Minicircuits MAV-11BSM

hi Alfredo, is your si570 working well with the sketch ? Just to know . regards, Ambro iw2fvo

I'm still designing the schematic before buyinh the components. RegardsAlfredo Mendiola Loyola

If the inductor has a core material other than air, such as powdered iron or ferrite (and it probably does), the DC current through it could saturate the core material. That would cause the inductor

Ambrogio, The Arduino Sketch Worked with my si570 Circuit. I had to use the i2c scanner to find the I2C address of the Si570. I'm including the picture