On Sun, 17 Mar 2013 02:26:27 -0700 (PDT), RealInfo
<therightinfo@gmail.com> wrote:

>My question is about the structure of a digitally controlled radio like this 
>http://www.hamradio.com/detail.cfm?pid=H0-010818

>How the micro controls the PLL so it will produce the exact frequency 
> that the LCD displays. 

Most such radios have one or more PLL (phase lock loops) that add and
multiply to produce the transmit and local oscillator frequency.  For
the TS-590S, you'll find a block diagram in the owners manual:
<http://www.kenwoodusa.com/communications/amateur_radio/hf_base_mobile/ts-590s>
<http://www.kenwoodusa.com/UserFiles/File/UnitedStates/Communications/AMA/Manuals/TS-590_In-Depth-Manual.pdf>
The "in depth" manual includes a theory of operation section that
explains how the PLL synthesizer works.  In this radio, there are 3
mixers (triple conversion) that eventually produce the 24KHz IF used
by the DSP.  There is also a single conversion section for specific
bands near the IF frequency.  See Section 1.x for details.

For more detail and schematics, the full service manual is at:
<http://mods.dk>
<http://www.mods.dk/downloadmanual.php?RefFil=TS-590S_Service_manual.zip&radio=>

>And how the micro translates the frequency knob to a chosen frequency . 

The knob runs a shaft encoder that eventually sets multiple divider
ratios (depending on frequency band) to produce the three local
oscillator frequencies.  The relationship is set by a formula that
varies with the type of conversion, frequency range, and tx/rx.  The
divider ratios set the various PLL's to eventually generate the
desired output frequency without also producing spurious and
extraneous extra frequencies and noise.

There's more to HF radio design than just synthesizing the necessary
frequencies.  In my never humble opinion, the processor and
synthesizer are the easiest parts of the puzzle.  This might help:
<http://www.edn.com/design/analog/4372294/High-performance-HF-transceiver-design-A-ham-s-perspective>



-- 
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

On Sunday, 17 March 2013 11:26:27 UTC+2, RealInfo  wrote:
> Hi all 
> 
> 
> 
> My question is about the structure of a digitally controlled radio like this 
> 
> http://www.hamradio.com/detail.cfm?pid=H0-010818
> 
> 
> 
> From the point of view of the micro controller that controls it . 
> 
> 
> 
> If I understand well that micro does 3 main things 
> 
> 1> controls the frequency of the PLL that functions as a local oscillator
> 
>     used by the rf mixer 
> 
> 2> sends the relevant data to the LCD . 
> 
> 
> 
> 3> respnds ti the buttons . 
> 
> 
> 
> I want to concentrate on the first two . 
> 
> 
> 
> How the micro controls the PLL so it will produce the exact frequency 
> 
>  that the LCD displays. 
> 
> 
> 
> And how the micro translates the frequency knob to a chosen frequency . 
> 
> 
> 
> Thanks 
> 
> Elico

Many thanks you all 
Elico

On a sunny day (Sun, 17 Mar 2013 02:26:27 -0700 (PDT)) it happened RealInfo
<therightinfo@gmail.com> wrote in
<cab942d4-8877-43ba-a798-4396f35408fe@googlegroups.com>:

>Hi all 
>
>My question is about the structure of a digitally controlled radio like this 
>http://www.hamradio.com/detail.cfm?pid=H0-010818
>
>From the point of view of the micro controller that controls it . 
>
>If I understand well that micro does 3 main things 
>1> controls the frequency of the PLL that functions as a local oscillator
>    used by the rf mixer 
>2> sends the relevant data to the LCD . 
>
>3> respnds ti the buttons . 
>
>I want to concentrate on the first two . 
>
>How the micro controls the PLL so it will produce the exact frequency 
> that the LCD displays. 

programmable divider


>And how the micro translates the frequency knob to a chosen frequency . 

rotary encoder.


>Thanks 
>Elico 
>
>
>
>
>
>
> 
>  
>

On 17.3.13 11:26 , RealInfo wrote:
> Hi all
>
> My question is about the structure of a digitally controlled radio like this
> http://www.hamradio.com/detail.cfm?pid=H0-010818
>
>  From the point of view of the micro controller that controls it .
>
> If I understand well that micro does 3 main things
> 1> controls the frequency of the PLL that functions as a local oscillator
>      used by the rf mixer
> 2> sends the relevant data to the LCD .
>
> 3> respnds ti the buttons .
>
> I want to concentrate on the first two .
>
> How the micro controls the PLL so it will produce the exact frequency
>   that the LCD displays.
>
> And how the micro translates the frequency knob to a chosen frequency .
>
> Thanks
> Elico


Many of the current designs are using Direct Digital Synthesis (DDS)
instead of a PLL, though also PLL designs are used. The details of
frequency set-up depend on the frequency generator chip (or chipset)
chosen and the selected frequency generation scheme.

For a primer on DDS, see:
<http://www.analog.com/library/analogDialogue/archives/38-08/dds.html>

There are also links to chip datasheets and app notes for controlling
them.

-- 

Tauno Voipio

On 2013-03-17, RealInfo <therightinfo@gmail.com> wrote:
> Hi all 
>
> My question is about the structure of a digitally controlled radio like this 
> http://www.hamradio.com/detail.cfm?pid=H0-010818
>
> From the point of view of the micro controller that controls it . 
>
> If I understand well that micro does 3 main things 
> 1> controls the frequency of the PLL that functions as a local oscillator
>     used by the rf mixer 
> 2> sends the relevant data to the LCD . 
>
> 3> respnds ti the buttons . 
>
> I want to concentrate on the first two . 
>
> How the micro controls the PLL so it will produce the exact frequency 
>  that the LCD displays. 

typically the PLL is a VCO which is divided and compared with a fixed
clock, the microcontroller will program clock divider - it may even
use an internal counter to do this. this divided clock is compared
with a reference clock and the difference is fed back to control the VCO

> And how the micro translates the frequency knob to a chosen frequency . 

probably some sort of quadrature encoder and a the micro just counts
up or down as the knob is turned.

-- 
&#9858;&#9859; 100% natural

Hi all 

My question is about the structure of a digitally controlled radio like this 
http://www.hamradio.com/detail.cfm?pid=H0-010818

From the point of view of the micro controller that controls it . 

If I understand well that micro does 3 main things 
1> controls the frequency of the PLL that functions as a local oscillator
    used by the rf mixer 
2> sends the relevant data to the LCD . 

3> respnds ti the buttons . 

I want to concentrate on the first two . 

How the micro controls the PLL so it will produce the exact frequency 
 that the LCD displays. 

And how the micro translates the frequency knob to a chosen frequency . 

Thanks 
Elico