K3, smd and spectral display

[Sverre Holm-2]

Benny Aumala wrote:

> "v6 SoftRock lite" kit ...
> If you will use it with K3, ask Tony to send 11 MHz Xtal with the kit.

Benny,

I don't quite understand the X-tal frequency of 11 MHz. My impression is
that the Softrock needs a crystal which is 4 x the center frequency, i.e. in
the order of 4 x 8.215 MHz or 32.86 MHz for the K3. What am I missing here?


73

Sverre
LA3ZA

Unofficial Guide to K2 Modifications
http://www.qslnet.de/member/la3za/K2/mod.html







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[Benny Aumala]

Yes, Sverre, you are right.
3rd overtone gives 33MHz /4= 8,250 which is a bit high, but
with 96k soundcard you have well room there.
This has been made working in a FT1000, see SoftRock reflector.
And works remarkably well, very sensitive, indeed.
I found a surplus 32,768 which is a bit closer and higher (8192).
The oscillator shoud not be in K3 roofing filters passband or near it s
filters.
Take care, if you are going to use AM or FM.
Advantage with Tony is: his Xtal works surely in that schema
and is small enough, maybe available inside kit s price. And he has them.
Ha det!

Benny
______________________

Sverre Holm kirjoitti:

> Benny Aumala wrote:
>
>  
>> "v6 SoftRock lite" kit ...
>> If you will use it with K3, ask Tony to send 11 MHz Xtal with the kit.
>>    
>
> Benny,
>
> I don't quite understand the X-tal frequency of 11 MHz. My impression is
> that the Softrock needs a crystal which is 4 x the center frequency,
> i.e. in
> the order of 4 x 8.215 MHz or 32.86 MHz for the K3. What am I missing
> here?
>
>
> 73
>
> Sverre
> LA3ZA
>
> Unofficial Guide to K2 Modifications
> http://www.qslnet.de/member/la3za/K2/mod.html
>
>
>
>
>
>
>
>  

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