Tuesday 6 October 2015

Xtall Filter Bilateral Amplifier - part 2

Quickly put together an amplifier to test the output circuit of the xtal filter thereby bypassing the last stage amplifier and see if things clear up. Well, sort of.  The signal clears up alright, but the amplification does not.  Below is a picture of the setup for reference. Maybe I've missed something, but I can't think of what? If I've made a mistake in the circuit, I've done it twice and I'd like to think that's unlikely.

I'll need to take a step back for a few days with this circuit as I need to fix my antenna and get ready for my tower/antenna installation this Friday.  Hopefully others will have some data soon with their boards to report on.

70mv is the input to the first stage amplifier. B trace is the input to the final amplifier at 800mv and the A trace at 300mv is the output.

I'm getting pretty good at building complicated attenuators.

73, Peter


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3 comments:

  1. Unknown6 October 2015 at 09:50

    Getting better, are you driving with the SI5351 generator with the amplifier or using something different? I'm thinking the drive has to be somewhat higher. Bump it up to 7db and check for smoke.

    73, Gord

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    Replies
    1. VE3POA6 October 2015 at 13:22

      So far I'm using a signal generator. Setting the output to 7dbm didn't make a difference. At least not in a positive manner. Lot more distortion in the earlier stages but gets kinda cleaned up.

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