yes of course: mention Nick ( WA5BDU ), P.Talacchini and IW2FVO . regards, 73 iw2fvo Ambrogio

QSL Thank you. Alfredo Mendiola Loyola

Ambrogio, Do I have to define this value: #define IFO_FRQ 10700000ULL // = 10.7 MHz ? If so, How Can I calculate the IFO_FRQ ? Regards Alfredo Mendiola OA4AJP

IF_offset is simply the value of the Intermediate frequency ( IF ) of your receiver . If you want to receive 432.000 MHz and your receiver IF is 21.4 MHz then your SI570 shall output 432.000 MHz -

I got it. Thank you for your help. Alfredo Mendiola Loyola

Ambrogio, What is the purpose of these variables: #define MIN_FRQ_DCO 4850000000ULL // = 4850MHz #define MAX_FRQ_DCO 5670000000ULL // = 5670MHz They are used in the method

Alfredo, the DCO must stay in the frequency range provided in the si570 specification.... NO, you should not remove the limits from the code. regards, Ambrogio

Hi Alfredo - First off, let me admit to zero knowledge about the Si570. I think it unlikely that the device could get anywhere near to 4850MHz (=4.85 GHz). I suspect that is a typo. I do note from

Hi Bob/Alfredo, Further down the KO7M link you provided he states: "The internal DCO is constrained to 4.85 to 5.67 GHz determined by the internal crystal frequency multiplied by a reference

I do suggest to read this document: https://www.silabs.com/documents/public/data-sheets/si570.pdf at page 14 figure 3. I confirm that there is no errors:> the DRO must stay in the 4.8 GHZ to 5.6

for a better explanation have a look at this part of the code: //--- First checks for N1=1 and HS_DIV between 4 & 11 i=1; for (j = 0; j <= 5; j++) { f_dco = (uint64_t)Fout *

Alfredo, I do remember you that the sketch does not use any pre_computed value to generate any output frequency. Just plug your Arduino to the Arduino IDE Monitor and command the frequency you want

Ambrogio, I found the information about the DCO frequency range in the si570 Datasheet. I understand how it works. I created a repository with the Version 5 of the software at:

Hello, If I connect a Center Tap of an 1:4 Transformer (Secondary) to the LVDS outputs I will get a 50 Ohm output impedance on the

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