Category Archives: Electronics - Page 27

80m LP-filter built

I did build a filter today, which I hope will solve our harmonic issues caused when transmitting on 80m. The hybrid lowpass filter I built didn’t work well, it caused 2:1 VSWR and didn’t do the job it was supposed to do. I don’t know why, but when building it I could not get the insertion loss down as low as I managed to do on the 40 and 20m filters, so I guess that might be why. However, I scrapped that filter and decided to try to attenuate the harmonics on the 200w side, that way I can make sure that is any harmonics are created its 100% in the amplifiers, since to some extent harmonic distortion is impossible to avoid. I have also realized that these filters wouldn’t be too hard to build for HP use, so that might be the way to go, since its a lot easier to build compared to band-pass filters.

I will not take credit of the LP-filter design. I did mess around trying to make some decent CAUER filter in Elsie but I didn’t get the result I wanted when I stumbled across an already made design already done, which was en example design in the Elsie directory. It looked so good that I decided to build it straight off. I measured the inductances I wounded on T130-2 cores and got a Q of about 85. This would according to Elsie give us an insertion loss on 80m at around 0.3dB which I felt was reasonable and a notch around -75dB.

I did some simulations also in Orcad to see what kind of voltages to expect over the capacitors and it was nothing bad. Even with a bad load I got less than 300v when transmitting with 200w, so I believe I have a quite safe margin using the 500v silver mica capacitors.

So, I built the filters and on the first try it looked really good, except that the notch was a bit off. So I did two iterations of the capacitors causing the notch and voila it was “perfect”. I felt it was good enough that I didn’t even try to change any of the other values. I had already measured the inductance of the inductors and saw they were quite close to what I wanted.

Now I plan to build another filter for 20m which notches away 10m. These are the two bands that causes most problems at SJ2W. But if this works I will probably build filter for 160 and 40m as well and make 19″ rack box with them and automatically switched with the openASC system.

Some mechanics built

I did build some mechanics today for the conversion of the 4-1000A amp to preset tuning.

I also updated the CQWW DX CW post with some pictures from the weekend.

Indoor station tour @SJ2W

I shot some videos of an indoor station tour of SJ2W just before the CQWW DX CW 2011 contest. The videos are not the best quality and unscripted, so keep that in mind and enjoy the tour.


Radio shack tour


Antenna switch room


openASC driver boards @SJ2W


Some amplifiers at SJ2W

FT1000D CAT interface and 80m 4-SQ box

This evening I got some more stuff built. I made a CAT interface for the FT1000D which I hope works fine so we can use it in CQWW CW. I’ve been having some issues with the CAT going through the openASC box since the USB is very sensitive against RFI. It might be the computer though since it only happens on the FT1000D, but just to be safe I built an interface for the COM port.

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I also finished up the 80m 4-SQ box and built a lid for it. It will need to get some paint to look a bit more pretty though. I hope to install all this during the weekend, so we have a spare 4-SQ box again. But this time with the new lid no condensed water should be able to drip down on the PCB. I will also put a 15w resistor inside the box to keep it a bit heated.