"Ceriel Nosforit" wrote

So r.r.a.h, if you are still reading, what has this humble newbie already
screwed up? I know the sensitivity is going to be extremely high, but I
should be able to fix that with some simple mechanics. My old LEGO bricks
should do the trick, come to think of it...

I'm doing a random wire "semi-automatic" tuner, and also trying to make
varicaps for it. I found a eBay seller from Germany, if I remember right,
who sells ready-made air-varicap plates. I bought few dosens of them for 20
euros. I think the seller ships worldwide. I'm sure there is other producers
too...

73 de Jukka, oh6mwq

Alas, on the wretched hour of Fri, 05 Jan 2007 15:32:13 +0000 Jukka
Pappinen thusly proclaimed:

"Ceriel Nosforit" wrote

So r.r.a.h, if you are still reading, what has this humble newbie already
screwed up? I know the sensitivity is going to be extremely high, but I
should be able to fix that with some simple mechanics. My old LEGO bricks
should do the trick, come to think of it...

I'm doing a random wire "semi-automatic" tuner, and also trying to make
varicaps for it. I found a eBay seller from Germany, if I remember right,
who sells ready-made air-varicap plates. I bought few dosens of them for 20
euros. I think the seller ships worldwide. I'm sure there is other producers
too...

73 de Jukka, oh6mwq

That's a rather good deal. I paid 25€ for material costs and an additional
5€ to my neighbour who got them for me. My brother who teaches handicrafts
at a school is going to let me use the workshop to do the rest of the
work, so right now I'm looking at a cost of 33€ for materials, but I still
haven't bought the plexiglass.

How is your tuner going to be semi-automatic, if I may ask?


p.s I can see you're a fellow Finn aswell, so here is a rather useful link
I found earlier today:
http://www.tkk.fi/Misc/Electronics/f...liikkeita.html
I'm sure Vekoy is a familiar place for you already, but still...

--
Nos

How is your tuner going to be semi-automatic, if I may ask?
=========================
Suggest you consider a stepper motor from a dumped
printer/scanner/floppy drive or HD ,if necessary including a shaft
rotational reducer when steps are too big.
Google will provide you with suitable (simple) circuits to drive the
motor ,usually involving one or more opamps.
From semi-automatic the circuit can evolve towards a fully automatic
system with a SWR sensing circuit.

Frank KN6WH/GM0CSZ

Alas, on the wretched hour of Fri, 05 Jan 2007 23:52:01 +0100 Highland
Ham thusly proclaimed:

How is your tuner going to be semi-automatic, if I may ask?
=========================
Suggest you consider a stepper motor from a dumped
printer/scanner/floppy drive or HD ,if necessary including a shaft
rotational reducer when steps are too big.
Google will provide you with suitable (simple) circuits to drive the
motor ,usually involving one or more opamps.
From semi-automatic the circuit can evolve towards a fully automatic
system with a SWR sensing circuit.

Frank KN6WH/GM0CSZ

You know... I just happen to have two old floppy drives in my drawer.
Might be able to control them as they are through the standard cable if I
have the right software. Would just have to make another mechanical
modification to put the motion to use. A standard diskette might come in
handy for that.

Excellent idea! Thanks!

--
Nos

"Ceriel Nosforit" kirjoitti viestissä:5Sznh.20298

How is your tuner going to be semi-automatic, if I may ask?

"Remote controlled tuner with few memories for spot frequencies" maybe
describes better what I'm going to do.

- Jukka, oh6mwq