nrg kit pll

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sinus trouble
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Re: nrg kit pll

Post by sinus trouble » Thu Aug 30, 2018 10:56 pm

Hello Mr Radium
As Mr NZ stated, it is hard to understand what is going on with just images!
Also where are the rest of the RF stages and how are you terminating the oscillator??

I had a quick glance at the schematic and your lock status comes from IC3 (74LS86) via R56 and D7
The lock/unlock LEDs should not effect the PLL? But will cause the OLPD section to malfunction!

However IC3 is also responsible for the PLL loop voltage which corrects the varicap!
There is a simple way of checking that your PLL is tracking the tuning! A voltage can be measured on the base of TR1 which should rise up or down whilst very carefully adjusting VC1?

I will try to dig out my NRG over the weekend and take some measurements
Good Luck!
I am as stupid as I look! :|

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Re: nrg kit pll

Post by radium98 » Thu Aug 30, 2018 11:16 pm

Thanks sinus i have changed all the ic same result .the lock green led always on .bc558 and 548 are genuine not the fake chinese .i have doubt with the 1n4148 orientation or any capacitor leak .i can test the frequency till the prescalet fleep floo 74als74.and tge crystal oscillator 6.25khz.but i have remarked that if i out my hand on the xtal around tge 4060 the green led flactuate and i can hear on the receiver that the pll is trying to lock.one signal then is missing as a conclusion.
Thanks for the help.

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Re: nrg kit pll

Post by sinus trouble » Fri Aug 31, 2018 12:00 am

No worries Mr Radium
I don't believe you components are fake or fitted incorrectly!
What range is your frequency counter? From the BF245s (TR4 TR5) you should be getting half frequency?
Depending on your DIP settings? IC3 will output a DC voltage to your varicap (VCD1) and will change if you adjust VC1! If this is the case? then you know the PLL is working and the problem lies in the LED lock section!
If the varicap voltage does not respond to your adjustment of VC1 then theres a problem!
I am as stupid as I look! :|

radium98
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Re: nrg kit pll

Post by radium98 » Fri Aug 31, 2018 4:31 pm

my frequency counter is up to 1ghz.
from the bf245b i have the half frequency ,lets say i am on 100 mhz ,i measure there at the out that is going to 74als74 50 mhz.
for the other next i will try to see if the voltage varie on the 1310 varicap i also tried bb204 that i have 1 piece.but i dont think that the voltage varie from the 74ls86 ever if i slowly turn the trimmer of the vco to near frequency like on the vero... board , i need to get clarified about the bc transistor used with orientations and the diode zener and 1n4148.
I will try to dig out my NRG over the weekend and take some measurements
Good Luck!
thanks for all the help to guet it work out.

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sinus trouble
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Re: nrg kit pll

Post by sinus trouble » Fri Aug 31, 2018 10:47 pm

Heres a pic which may help
20140316_170704.jpg
And schematic!
NRG ProIII Schematic.JPG
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Re: nrg kit pll

Post by radium98 » Sun Sep 02, 2018 8:01 am

where is the schematic ?
Heres a pic which may help
The attachment 20140316_170704.jpg is no longer available
And schematic!

anyway thanks Sinus trouble

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Re: nrg kit pll

Post by shorty » Sun Sep 02, 2018 10:21 am

I looked at your photos, the diodes / transistors look to be fitted the right way round, your parts placement looks ok, this is the silk screen layout, parts list & schematic, you need to check every part against the list and layout, it should fire up if all parts are ok.
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Re: nrg kit pll

Post by RF-Head » Sun Sep 02, 2018 10:47 am

Can you make a picture of the SIL resistors next to the 4059?
Maybe they are mounted the wrong way

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Re: nrg kit pll

Post by radium98 » Sun Sep 02, 2018 5:20 pm



thanks you for every one and every help .
My bad it was a shorten 1n4148 and a very critical resistor instead of 18k i have putted 15k strange for that .
Now later i will do the coils and fit the power transistor and lets you know.
Oh very clean audio ,i Love its audio quality .
thanks aGain

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Re: nrg kit pll

Post by radium98 » Sun Sep 02, 2018 5:22 pm

forget to say i have further to drift pitch the xtal a bit i will add a little trimmer because i always have a 98.15 98.35 always 0.5 a 50khz step PLUS.

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Re: nrg kit pll

Post by radium98 » Fri Sep 07, 2018 8:29 pm

tuning aid .

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Re: nrg kit pll

Post by radium98 » Fri Sep 07, 2018 8:30 pm

21768731_10212094445690593_5849866086351328704_o.jpg
tuning aid .
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Re: nrg kit pll

Post by Albert H » Mon Sep 10, 2018 1:10 am

OK folks. Stephen and I wanted to make alignment of the VCO trimmer capacitor as easy as possible, so this is the circuit that I came up with:
Tuning_Indicator_tidied-V2.png
When both LEDs are off, the voltage at the input (emitter of Tr1 on the PLL Pro III board) is 3.2V +/- 0.75V. You set the switches for the frequency you want, then rotate the VCO trimmer capacitor slowly until both tuning LEDs are off.
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Re: nrg kit pll

Post by radium98 » Mon Sep 10, 2018 9:42 am

I was using it as an aid to find center lock in vero.... board .it seems to be a simple comparator .but tuning is very sharp.thanks for the brillant idea .this board abose is the design of you albert.

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