Soldering it sealed worked pretty well! Usually each fraction of a dB costs twice as much time and money as the last fraction did (until we're completely mad, broke, or both, heh). Really enjoying this exploration, Nick, thank you.
Said it before, your easily pleased Joe. Law of diminishing returns trying to get fractions of a db. I could have sent it to you to give it a good home, but you've already bought some!
You did a great job. It would also be interesting to see it on the Smith Chart or VNA to see where it exhibits C or L reactance and how far it departs from 50 ohms. My only critique of it is that it needs more solder 🙃😉 I bet you will use it more than you might think.
More solder! I used about 3 quids worth already! Should have soldered it before it was all together, then it would have been neater. Can put it on the nano Vna but not sure what that would achieve.
I used doubled sided copper fibre glass board to make my prototype atrocities, and they worked well. And a lot of copper foil tape to join the top plane to bottom.Shame I can't afford to ship you and the good crew of Cruncher's these 5lb spools of AIM rosine core 63/37 solder. @@ptronix
That performance is great, well done. But if you really want to track down that last few ppm of losses, I'd try a loopback cable using the same coax leads i.e. bypassing the attenuator, in case it's the leads or even the spectrum analyser itself that's responsible.
Soldering it sealed worked pretty well! Usually each fraction of a dB costs twice as much time and money as the last fraction did (until we're completely mad, broke, or both, heh). Really enjoying this exploration, Nick, thank you.
Said it before, your easily pleased Joe.
Law of diminishing returns trying to get fractions of a db. I could have sent it to you to give it a good home, but you've already bought some!
@@ptronix That's a very kind thought, but postage would exceed, what, 10x the parts cost?
@@matambale 30 quid probably
Impressive, Nick.
Thanks, I declare this project finished
You did a great job. It would also be interesting to see it on the Smith Chart or VNA to see where it exhibits C or L reactance and how far it departs from 50 ohms. My only critique of it is that it needs more solder 🙃😉 I bet you will use it more than you might think.
More solder! I used about 3 quids worth already! Should have soldered it before it was all together, then it would have been neater. Can put it on the nano Vna but not sure what that would achieve.
I used doubled sided copper fibre glass board to make my prototype atrocities, and they worked well. And a lot of copper foil tape to join the top plane to bottom.Shame I can't afford to ship you and the good crew of Cruncher's these 5lb spools of AIM rosine core 63/37 solder. @@ptronix
Well done Nick 😀
Thanks Mike
That performance is great, well done. But if you really want to track down that last few ppm of losses, I'd try a loopback cable using the same coax leads i.e. bypassing the attenuator, in case it's the leads or even the spectrum analyser itself that's responsible.
Thanks, I always do a normalisation on the spectrum analyzer before doing any measurements, that eliminates the any losses in the cables
I love it good 👍