NRGkitz or Veronica 50mW circuit diagram

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Bton-FM
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Re: NRGkitz or Veronica 50mW circuit diagram

Post by Bton-FM » Wed Jun 17, 2020 10:06 am

nrgkits.nz wrote:
Wed Jun 17, 2020 12:34 am
Albert H posted a 5W exciter schematic a few years back, it’s on the forums under a thread labeled “cheap 1w exciters”. Use the output matching from this schematic, not only does it match from around 12R up to 50R it also acts as a band pass filter from 87.5 to 108 - this should help cut back any 1/2 freq and 1 1/2 freq from getting to the output.
Do you mean the output matching after the oscillator in the schematic or the output matching on the final ?Also when I changed the coil that feeds the transistors with 5v for a ferrite bead with 5 turns it got rid of all the 1/2F and 1 1/2F, it’s in the grass.The only problem is 2f which is only
A couple db down from the carrier but this should help sort that.

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Re: NRGkitz or Veronica 50mW circuit diagram

Post by nrgkits.nz » Wed Jun 17, 2020 11:27 am

Yes I was referring to the output after the final, but it sounds like you’ve already solved the problem with the 1/2 and 1 1/2. The 2F you’re getting will be the harmonic content, a low pass filter on the output will fix that. In my designs, harmonics are -65dBc below the main fundamental.

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Re: NRGkitz or Veronica 50mW circuit diagram

Post by Bton-FM » Wed Jun 17, 2020 12:03 pm

nrgkits.nz wrote:
Wed Jun 17, 2020 11:27 am
Yes I was referring to the output after the final, but it sounds like you’ve already solved the problem with the 1/2 and 1 1/2. The 2F you’re getting will be the harmonic content, a low pass filter on the output will fix that. In my designs, harmonics are -65dBc below the main fundamental.
I don't know if its a problem with the circuit though because there is nearly the same amount of 2F coming out of the oscillator as 1F?

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Re: NRGkitz or Veronica 50mW circuit diagram

Post by Bton-FM » Wed Jun 17, 2020 12:49 pm

Also there are a lot of spurs next to the carrier so maybe there are some low frequency oscillations?

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Re: NRGkitz or Veronica 50mW circuit diagram

Post by Albert H » Thu Jun 18, 2020 2:05 am

Is your power supply clean? have you got sufficient RF bypassing from the supply rail to ground? If you're using a voltage regulator IC, have you put RF bypass capacitors on the pins to ground?
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Re: NRGkitz or Veronica 50mW circuit diagram

Post by Bton-FM » Thu Jun 18, 2020 9:59 pm

I don’t know How clean my power supply is it’s an old maplin 12v linear supply.My regulators are bypassed it includes them in the schematic.Maybe the problem is that the piece of wire going from my oscillator into the analyser is becoming apart of the oscillator?When I put my head near the wire the super and harmonics change and flare up.Maybe it needs a buffer?

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Re: NRGkitz or Veronica 50mW circuit diagram

Post by 1608cc » Sat Sep 26, 2020 5:56 pm

On time... Did you solve the problem ? Is there any capacitor connected at the output ? (it is absent on schematic). Do you have photos of mounted TX - would be nice to see ;) In attachment schematic of version with no tune 1 - 2 W PA and SAA1057 based PLL (open pic and zoom it to make it sharp).
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Re: NRGkitz or Veronica 50mW circuit diagram

Post by Bton-FM » Sat Sep 26, 2020 6:13 pm

1608cc wrote:
Sat Sep 26, 2020 5:56 pm
On time... Did you solve the problem ? Is there any capacitor connected at the output ? (it is absent on schematic). Do you have photos of mounted TX - would be nice to see ;) In attachment schematic of version with no tune 1 - 2 W PA and SAA1057 based PLL (open pic and zoom it to make it sharp).
Hi 1608cc,
No I didn't in the end. I really made a dog's dinner of it when I was constructing it. Maybe I'll revisit it sometime.

I changed tac' and gone with a dual-gate fet oscillator, with a TSA5511 PLL and a 1 watt stage instead. I've nearly finished Ironing out all the problems with the prototype. After I've got some boards made I'll make a post about it! :)

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Re: NRGkitz or Veronica 50mW circuit diagram

Post by 1608cc » Sat Sep 26, 2020 7:11 pm

:tup

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