Re: Si570 Set Frequency

Alfredo Mendiola Loyola

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

On Wednesday, April 17, 2019, 2:31:00 PM GMT-5, Ambro_IW2FVO via Groups.Io <iw2fvo@...> wrote:

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 - 21.4 MHz for low side injection
or it shall output 432.000 MHz+ 21.4 MHz if you use the top side injection.
If you set the IFO_FRQ=0 in the code then the SI570 will output the frequency value received through the serial link ( from the IDE monitor ) without any offset.
73, iw2fvo

Re: Si570 Set Frequency

Ambro_IW2FVO

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 - 21.4 MHz for low side injection
or it shall output 432.000 MHz+ 21.4 MHz if you use the top side injection.
If you set the IFO_FRQ=0 in the code then the SI570 will output the frequency value received through the serial link ( from the IDE monitor ) without any offset.
73, iw2fvo

Re: Si570 Set Frequency

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

Re: Si570 Set Frequency

Alfredo Mendiola Loyola

QSL
Thank you.
Alfredo Mendiola Loyola

On Wednesday, April 17, 2019, 11:19:07 AM GMT-5, Ambro_IW2FVO via Groups.Io <iw2fvo@...> wrote:

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

Re: Si570 Set Frequency

Ambro_IW2FVO

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

Re: Si570 Set Frequency

Alfredo Mendiola Loyola

On Wed, Apr 17, 2019 at 07:38 AM, Ambro_IW2FVO wrote:

Ambrogio
Thank you very much Ambrogio.
I will test the code.

Can I share it in a GitHub repository?

Regards
Alfredo Mendiola
OA4AJP

Re: Si570 Set Frequency

Ambro_IW2FVO

Hi Alfredo, this is iw2fvo .
Years ago I got in touch with Nick WA5BDU to have some indication about the si570 control and thank to his suggestion I developed a sketch capable of controlling the SI570 in its whole frequency band ( up to 1.4 GHZ )
I did use this sketch on Arduino Nano as a VFO for my two meters FM receiver and for the APT receiver.
The sketch does not requires to enter pre_computed values : it performs the calculation for each one of the required frequencies.
It receives the operating frequency using Nano UART input : You can use the Arduino IDE Monitor ( e.g. : 150.123.500 to set 153.123500 MHz ) to control the frequency output.
you can define the IF freq offset : see line 72 of the code ( it is set to 10.7 MHz : change it as you need).
you can disable some messages sent to the monitor if not needed. There is a define for that monitor.
I hope this sketch will help since I was able to generate frequencies of about 300 MHz due to the limited frequency range of my si570 chip.
I will try to attach the sketch here !
Thanks Nick !
I am sorry for my bad English !!!
73, IW2FVO, Ambrogio

Re: PHSNA

tlemense@...

I’m interested! Hope I wasn’t too slow again!

Best Regards,
Tom LeMense

On Apr 15, 2019, at 11:09 AM, N6WKZ <n6wkz@...> wrote:

Anyone interested in a PHSNA, just built, \$70.00 + \$12.00 shipping. Arduino, PC Board and AD9850 Frequency Generator Board. See attached photo.

73

Phil N6WKZ

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<PHSND.jpg>

PHSNA

Phil N6WKZ

Anyone interested in a PHSNA, just built, \$70.00 + \$12.00 shipping. Arduino, PC Board and AD9850 Frequency Generator Board. See attached photo.

73

Phil N6WKZ

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Re: Si570 Set Frequency

Alfredo Mendiola Loyola

I found this library sarfata/radiono, I think I can use it to set the frequencies on the si570.

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Minima's Arduino software. Useful for controlling a homebrew Si570 based superhet transceiver/receiver. - sarfat...
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73sAlfredo Mendiola LoyolaOA4AJP

On Monday, April 15, 2019, 9:04:36 AM GMT-5, wb6ogd <garywinblad@...> wrote:

The Si570 is a tricky beast!
Craig AA0ZZ conquered the programming using pre-calculated tables like
Nick said.

Silicon Labs has an app note that has C code for one of their
microcontroller chips.
I was able to port that to a PIC using Microchip's free C compiler but
it took up almost
all the memory  :(

BUT Arduino's run C and pretty efficiently.  I would get the app note
and port it to
Arduino.  The actual code that sets the frequency is only a few lines.
It is probably
not as fast as the integer calculation/table method.

If you could use the Si5351, there are Arduino libraries available to do
it.  Is easy,
I have been using the Etherkit library and board for a few years now.

I have both an AD9851 (DDS-60) and Si5351 in my PHSNA using modified
Nick code
with LCD and encoder for local standalone.  It is my favorite piece of
test equipment,
thanks to Nick and PHSNA group!!
Code is posted in the Files area.
73,
Gary
WB6OGD

On 4/14/2019 1:55 PM, Nick Kennedy wrote:
For this program it might take a bit of work. The program is set up to have
pre-calculated register values for all frequency ranges within the
specified limits, so the amount of calculation required for a small change
within a band is minimized. So you would need to expand the tables of
values all the way up to your desired 440 MHz limit to continue with that
method.

There's no reason you couldn't do it, but you'd have to study the code
(and/or the AA0ZZ QEX article) a bit to understand how the tables are
constructed.

I have expanded this basic program to one that includes display, rotary
encoder, TX/RX offset and so on, but I haven't expanded the frequency
limits because the version of the Si570 that I'm using is only specified to
160 MHz.

Good luck with it.

73-

NIck, WA5BDU

On Sun, Apr 14, 2019 at 12:59 PM Alfredo Mendiola Loyola via Groups.Io
<mendiola_loyola@...> wrote:

Hello:

I have found this Arduino code to set the Frequency on a si570 oscillator
but it has a max frequency of 157 Mhz (#define ULIMIT 157000000UL),

Is there a way to modify the source code to make it work until 440 Mhz ?

I would like to set frequencies from 430 to 440 mhz.

Regards
Alfredo Mendiola
OA4AJP

Re: Si570 Set Frequency

wb6ogd

The Si570 is a tricky beast!
Craig AA0ZZ conquered the programming using pre-calculated tables like Nick said.

Silicon Labs has an app note that has C code for one of their microcontroller chips.
I was able to port that to a PIC using Microchip's free C compiler but it took up almost
all the memory  :(

BUT Arduino's run C and pretty efficiently.  I would get the app note and port it to
Arduino.  The actual code that sets the frequency is only a few lines.  It is probably
not as fast as the integer calculation/table method.

If you could use the Si5351, there are Arduino libraries available to do it.  Is easy,
I have been using the Etherkit library and board for a few years now.

I have both an AD9851 (DDS-60) and Si5351 in my PHSNA using modified Nick code
with LCD and encoder for local standalone.  It is my favorite piece of test equipment,
thanks to Nick and PHSNA group!!
Code is posted in the Files area.
73,
Gary
WB6OGD

On 4/14/2019 1:55 PM, Nick Kennedy wrote:
For this program it might take a bit of work. The program is set up to have
pre-calculated register values for all frequency ranges within the
specified limits, so the amount of calculation required for a small change
within a band is minimized. So you would need to expand the tables of
values all the way up to your desired 440 MHz limit to continue with that
method.

There's no reason you couldn't do it, but you'd have to study the code
(and/or the AA0ZZ QEX article) a bit to understand how the tables are
constructed.

I have expanded this basic program to one that includes display, rotary
encoder, TX/RX offset and so on, but I haven't expanded the frequency
limits because the version of the Si570 that I'm using is only specified to
160 MHz.

Good luck with it.

73-

NIck, WA5BDU

On Sun, Apr 14, 2019 at 12:59 PM Alfredo Mendiola Loyola via Groups.Io
<mendiola_loyola@...> wrote:

Hello:

I have found this Arduino code to set the Frequency on a si570 oscillator
but it has a max frequency of 157 Mhz (#define ULIMIT 157000000UL),

Is there a way to modify the source code to make it work until 440 Mhz ?

I would like to set frequencies from 430 to 440 mhz.

Regards
Alfredo Mendiola
OA4AJP

Re: Si570 Set Frequency

Nick Kennedy

For this program it might take a bit of work. The program is set up to have
pre-calculated register values for all frequency ranges within the
specified limits, so the amount of calculation required for a small change
within a band is minimized. So you would need to expand the tables of
values all the way up to your desired 440 MHz limit to continue with that
method.

There's no reason you couldn't do it, but you'd have to study the code
(and/or the AA0ZZ QEX article) a bit to understand how the tables are
constructed.

I have expanded this basic program to one that includes display, rotary
encoder, TX/RX offset and so on, but I haven't expanded the frequency
limits because the version of the Si570 that I'm using is only specified to
160 MHz.

Good luck with it.

73-

NIck, WA5BDU

On Sun, Apr 14, 2019 at 12:59 PM Alfredo Mendiola Loyola via Groups.Io
<mendiola_loyola@...> wrote:

Hello:

I have found this Arduino code to set the Frequency on a si570 oscillator
but it has a max frequency of 157 Mhz (#define ULIMIT 157000000UL),

Is there a way to modify the source code to make it work until 440 Mhz ?

I would like to set frequencies from 430 to 440 mhz.

Regards
Alfredo Mendiola
OA4AJP

Re: Si570 Set Frequency

Ricardo Caratti

Try it:

Where did you see
#define ULIMIT 157000000UL

replace to
#define ULIMIT 440000000UL

The last band starts on 135MHz. You might need to change this value
too on this code:
uint32_t SiBandTable[24] =
{10000000, 11000000, 12000000, 13000000, 15000000, 17000000, 19000000,
21000000, 23000000, 25000000, 28000000, 32000000, 36000000, 41000000,
47000000, 54000000, 61000000, 70000000, 81000000, 90000000,
101000000,
111000000, 128000000, *135000000*};

Try to replace the values of the bands to values of your goal.

73.

On Sun, Apr 14, 2019 at 2:59 PM Alfredo Mendiola Loyola via Groups.Io
<mendiola_loyola@...> wrote:

Hello:

I have found this Arduino code to set the Frequency on a si570 oscillator
but it has a max frequency of 157 Mhz (#define ULIMIT 157000000UL),

Is there a way to modify the source code to make it work until 440 Mhz ?

I would like to set frequencies from 430 to 440 mhz.

Regards
Alfredo Mendiola
OA4AJP

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Skype: ricardo_caratti
Mobile: +55 61 81442296

Si570 Set Frequency

Alfredo Mendiola Loyola

Hello:

I have found this Arduino code to set the Frequency on a si570 oscillator but it has a max frequency of 157 Mhz (#define ULIMIT 157000000UL),

Is there a way to modify the source code to make it work until 440 Mhz ?

I would like to set frequencies from 430 to 440 mhz.

Regards
Alfredo Mendiola
OA4AJP

Re: Shielding for Power meter?

wb6ogd

Wow Mike,
I thought you attached the wrong photo at first...  OMG, you do pro work!!
73,
Gary
WB6OGD

On 2/25/2019 6:37 PM, K5ESS wrote:
I used tin plated steel sheet from Hobby Lobby. It cuts easily and solders very well. See attached on right side.
Mike
K5ESS

-----Original Message-----
From: PHSNA@groups.io [mailto:PHSNA@groups.io] On Behalf Of Ben Pharr
Sent: Monday, February 25, 2019 9:45 AM
To: PHSNA@groups.io
Subject: [PHSNA] Shielding for Power meter?

I have one of N5IB's power meter boards and I'm almost ready to assemble it. What kind of material do I need to shield the SMD section? Some sort of copper foil I'm assuming? Can someone give me some specs? Any suggestions on where I can buy some?

Thanks,
Ben
WF5N

Re: Shielding for Power meter?

Ronald Morrison

Some of the guitar parts supply places sell an adhesive backed copper foil that is much wider.  I bought a roll of 2 3/8" wide foil tape.  Great for shielding or for making pcbs from perf board, etc. Even add a side of copper to a single sided pcb.
Ron, K5DUZ

On Tuesday, February 26, 2019, 12:03:09 AM CST, jim via Groups.Io <ab7vf@...> wrote:

The last copper foil I bought  (1/2" wide 60' roll), about 20 years ago at a stained glass shop ..Do they even have those  anymore?
Lots of it on Amazon

Jim

On Monday, February 25, 2019, 7:44:47 AM PST, Ben Pharr <bnp@...> wrote:

I have one of N5IB's power meter boards and I'm almost ready to assemble it. What kind of material do I need to shield the SMD section? Some sort of copper foil I'm assuming? Can someone give me some specs? Any suggestions on where I can buy some?

Thanks,
Ben
WF5N

Re: Shielding for Power meter?

jim

The last copper foil I bought  (1/2" wide 60' roll), about 20 years ago at a stained glass shop ..Do they even have those  anymore?
Lots of it on Amazon

Jim

On Monday, February 25, 2019, 7:44:47 AM PST, Ben Pharr <bnp@...> wrote:

I have one of N5IB's power meter boards and I'm almost ready to assemble it. What kind of material do I need to shield the SMD section? Some sort of copper foil I'm assuming? Can someone give me some specs? Any suggestions on where I can buy some?

Thanks,
Ben
WF5N

Re: Shielding for Power meter?

K5ESS

I used tin plated steel sheet from Hobby Lobby. It cuts easily and solders very well. See attached on right side.
Mike
K5ESS

-----Original Message-----
From: PHSNA@groups.io [mailto:PHSNA@groups.io] On Behalf Of Ben Pharr
Sent: Monday, February 25, 2019 9:45 AM
To: PHSNA@groups.io
Subject: [PHSNA] Shielding for Power meter?

I have one of N5IB's power meter boards and I'm almost ready to assemble it. What kind of material do I need to shield the SMD section? Some sort of copper foil I'm assuming? Can someone give me some specs? Any suggestions on where I can buy some?

Thanks,
Ben
WF5N

Re: Shielding for Power meter?

Nick Kennedy

I don't want to speak for him but I think Jim said he didn't notice much
difference with and without the foil. It sure looks cool though.

I'd suggest that Hobby Lobby might have copper foil or sheets of proper
thickness for the job.

73-

Nick, WA5BDU

On Mon, Feb 25, 2019 at 9:44 AM Ben Pharr <bnp@...> wrote:

I have one of N5IB's power meter boards and I'm almost ready to assemble
it. What kind of material do I need to shield the SMD section? Some sort of
copper foil I'm assuming? Can someone give me some specs? Any suggestions
on where I can buy some?

Thanks,
Ben
WF5N

Re: Shielding for Power meter?

EB4APL

Copper foil is good, but you can also use tin foil recovered from a beer can (one that is not made from aluminum) Remove the paint and cut it to size with a pair of scissors.

73 de

Ignacio, EB4APL

)

El 25/02/2019 a las 19:52, wb6ogd escribió:
I don't know if it fits his board, but I made my custom board to use a copper pipe cap from the hardware store,
see attached...
73,
Gary
WB6OGD

On 2/25/2019 7:44 AM, Ben Pharr wrote:
I have one of N5IB's power meter boards and I'm almost ready to assemble it. What kind of material do I need to shield the SMD section? Some sort of copper foil I'm assuming? Can someone give me some specs? Any suggestions on where I can buy some?

Thanks,
Ben
WF5N

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