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Author Topic: Cheap Electronic VFO  (Read 3722 times)
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n3lrx
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« on: December 18, 2006, 07:13:38 PM »
Let's hope it's not too cheap! I just ordered one if I can ever get this transmitter working I'll let you know how it works.. If you can't tell I'm using it I guess it works! LOL

80m Elec. VFO Kit
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steve_qix
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« Reply #1 on: December 19, 2006, 09:11:53 AM »
Quote from: n3lrx on December 18, 2006, 07:13:38 PM
Let's hope it's not too cheap! I just ordered one if I can ever get this transmitter working I'll let you know how it works.. If you can't tell I'm using it I guess it works! LOL

80m Elec. VFO Kit

Phase noise will be the issue.  If there is no phase noise, it will probably work very well !

Regards,

Steve
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WA1GFZ
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« Reply #2 on: December 19, 2006, 09:53:25 AM »
You will need a very clean power supply tuning an oscillator with a pot.
Any ripple on the supply will fm modulate the carrier.
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n3lrx
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« Reply #3 on: December 19, 2006, 12:01:48 PM »
I have a few low current Power One type Computer grade supplies. That should do it. I'm also going to check into changing the rough pot into a something a little less harsh try a precision pot or a 10 turn. Don't know what value it is yet, but I've got a few milspec pots in the shed one might work.
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KB2WIG
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« Reply #4 on: December 19, 2006, 12:54:54 PM »
How cheep is cheep??   I used a ARRRL ss vfo outa one of the ( 1978'??) hand book.  I think it was a Coal pit; (2) 2n2222 and maybee a mpf102 as a driver.. nothing special .. coils wound on pencil?  It was clean and stable.... and used on hand parts....   klc
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What? Me worry?
n3lrx
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« Reply #5 on: December 19, 2006, 01:01:34 PM »
Well,
By the time I get done with this thing.. If it works, this transmitter is gonna have enough JS'ing goin on.. A few bucks even thoug it'll be in a box and noboby will see it, for a nice looking PCB instead of dead bug will at least make me feel better.
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KB2WIG
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« Reply #6 on: December 19, 2006, 01:04:03 PM »
Just make sure you paint the box black.... then its O.K.         klc
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n3lrx
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« Reply #7 on: December 19, 2006, 06:06:14 PM »
Quote from: kc kb2wig on December 19, 2006, 01:04:03 PM
Just make sure you paint the box black.... then its O.K.         klc

No... Chrome! Chrome always adds more horsepower and makes it go faster! LOL
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