digital pira pll tuning help

[radium98]

Hi folk dear Juan i need a help i made recently the digital pll board thats fantastic a big thanks but i need help connecting it to a tunable vfo 1w transmitter thanks schematic for transmitter that i need to connect is shown here .






thanks

[radium98]

please help me  where are people ? knowldege

[carlos manhique]

Hi

What you have show is part of SK1021/SK1031 SMARTKIT 20/30W VFO transmitters. They are NOT prepared to be part of  PLL system , unless you modify the oscillator.

[radium98]

carlos manhique can you help me in more deeply i have tried many things no succses

[Jan]

I'm afraid nobody can help you as nobody has tried this modification. Without trying and hours of experiments, no solution can be found. The RF electronic is not a connect and go job. The PLL has been originally designed for another transmitter with another voltage tuning sensitivity so I'm afraid it may not work at all. The PLL and the oscillator are usually one part. Combining of different circuits may be impossible.

[carlos manhique]

Hi

Just make your oscillator similar to the one used on SK1187 and that's it.
Good work
Carlos Manhique

[radium98]

Thanks Jan .
carlos manhique its best solution you are right but lots of work because its a so far design BTW i have an old sk1187 smart kit VCO i will do some experience i think it should work ,because i also tried this sk1187 with another bcd rotary coded frequency and it work .the problem i was need the same vco sk1031 or 1021 design with no need to auto tune from the pll  pira only like the veronica set the frequency and lock the pll .

[carlos manhique]

Hi Jan. Would you please let me know what is the voltage output range of your PLL circuit, needed  to cover  88 to 108 MHz?
As a challenge to myself, I am busy working on minimum modification of  SK1021/31 to suit PIRA PLL CIRCUIT. Best Regards. Carlos

[radium98]

hi carlos thanks bro for helping me indirect

[carlos manhique]

You are welcome. What type of modification have you tried so far?

Why dont you try the oscillator used by Jan  on his old 3Watt TX,
 RF part?

[radium98]

i have removed P1 and directly feed the varicap .and i self tuned the oscillator like the veronica system .oscillator of Jun is not working as frequency set on dip

[radium98]

what i have done

[carlos manhique]

Hi!
I think Veronica PLL system will hardly work with other oscilltors. The system is prepared to control oscillators working at half of FM  frequency. Oscillators are set for 44 to 54 MHz.
Again, you can use oscillators made by PIRA CZ: 3W or 5W type.
 

[radium98]

carlos a misunderstand bro

the first tx is the pira 1w pll

the second is the smart kit vfo 1021 1031 never mind

i want to use the first pll pira with the second transmitter that i have put schematic above

what shoud i try to change and add components value

i know after that i must tune the vco to the the frequency set on the dip switsh to get a lock condition.