I was learning my way around Farhan's new Antuino this morning. Very cool. I decided to start with the Scalar Network Analyzer. I've spent so much time measuring and plotting filter response curves BY HAND... the Antuino is an opportunity for me to move into the 21st Century.
In the picture you see the results. I was using a Heathkit SSB filter with the center frequency at 3.395 Mhz. The Antuino was set for that freq, with the screen range set at +/- 10. That means each division on the screen is 1 khz (right?). The Heath filter is advertised as being 2.1 khz wide at 6 db down. That pretty much matches what we see here.
You can see ripple in the filter passband. This is almost certainly the result of an impedance missmatch. It looks to me like the Antuino is set up with 50 ohm inputs and outputs. The Heath filter probably needs higher impedances to have a smooth passband. I will try later to set it up for a smooth passband.
It is easy to see how useful this device will be. Thanks Farhan!
More on the Antuino here:
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ReplyDeleteUh, did you mean for that comment about marriage to slip through?
ReplyDeleteTim: No, I removed it. 73 Bill
ReplyDeleteHow did you get your hands on one of these units? I thought they are not available yet?
ReplyDeleteI already have a Rigexpert AA35 Zoom. But I am pretty sure, I'll also want one of these, once available :-)