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Hello CV, Sorry for missing the question about the varactor. Maybe this willhelp to build the model:

A couple of other points: The antenna load doesn't do anything. If you want it to be there, connect the right end of that resistor to an AC ground (ground it through a capacitor). It looks like your

It looks like you were doing an .AC analysis. You should be using a .TRAN (transient) analysis. I hate to say it, but the .AC analysis doesn't really show you anything in this case. Andy

People (especially radio amateurs) get very hung up on using silver plated wire for inductors. Anyone with an iota of curiosity (read: diligence) can quickly establish that the conductivity and skin

In message <kt6gov+l9n9@...>, dated Mon, 29 Jul 2013, christianvierck <christianvierck@...> writes: Yes, I meant the BFR92. A model that was no so good probably wouldn't show the

Sorry, do you mean the model of the BB105 .model BB105 D(Is=.1p Rs=1 Bv=35 Ibv=10u Cjo=35p Vj=.75 M=.8) or the model I use for the BRF92. Here I have to trust the designers. ;) Thanks for supporting.

In message <kt6efj+urt6@...>, dated Mon, 29 Jul 2013, christianvierck <christianvierck@...> writes: I guess you have that. See below. In your previous post, you said it was oscillating

I think it doesn't change something on the frequency. But it could be the easier way. I mean I am a amateur using LTSpice. Because I only startet working with it a few days ago. I hope, I will find a

In message <kt6alh+9g3j@...>, dated Mon, 29 Jul 2013, christianvierck <christianvierck@...> writes: Since the tap only feeds the antenna, I suggest you forget the tap and just put a

Hallo Christian, If that is the case, it might be that the second stage is meant to be a tripler. -- Regards, Arwin.

Yeah, it gives me now a oscillation at about 1GHz.

Thank you for the instruction for the K factor. If I have time left, I will try to handle the problem with the transistors. If it works, I will give you a feedback. But I think it is impossible for a

If adding the inductor there made a difference, then I think you are on the right track. It probably means the first transistor is now oscillating. Can you see the oscillation on that transistor,

Good question! Could be either or both. This oscillator circuit looks "funny" to me because it lacks an explicit positive feedback path, so I'm guessing it makes use of characteristics internal to the

> For the most part you need to add little inductors in series with each > component. There is no parameter or something similar that adds an > inductance everywhere. > > Capacitors in LTspice do have

Do you think I used the wrong models or the setup of my circuit is wrong? No they are not. I thought if it is a coil with tap I can separate it without using this. On the first hand I don't know how

For the most part you need to add little inductors in series with each component. There is no parameter or something similar that adds an inductance everywhere. Capacitors in LTspice do have an

Okay, thank you. I am absolutely confused how to handle this problem. :) The best way to find an answer is to ask my professor what he wants. He gave me this circuit and said: as a training you have

Something is wrong with that. The frequency should depend on the capacitance at that node (top of BB105 to ground). If it doesn't, then the oscillator transistor (the one on the left) isn't

Hi, the theory is evident. I didn't reflect on the difference between the simulation and the original specification of the frequency in my image. I thought of the ideal characteristics of the