Not Solely On The TX Facet


Not Solely On The TX Facet

So here is the screenshot. When measured the filter bandpass and the loss, I used to be still curious about the filter return loss / SWR so additional take a look at was carried out utilizing the network analyser. This measurement gave me quite good concept in regards to the characteristics the place the minimum obtained R.L. 16.29 dB or the SWR of 1:1.36. This way I was fairly certain that the mixer RF port is terminated with the impedance close to 50 ohms. At the end, I tried to tune the filter for even better RL, what was potential but on the other facet affecting the pass-band characteristic. This filter is designed as a no tune venture and I used to be proud of the above presented outcomes. They correlate much with all already revealed by Paul, W1GHZ. The small differences are result of perhaps totally different FR-four used, barely different dielectric constant, or the fact that my filter was not coated – galvanised. Non uniform Er can even have an effect on the results the place FR-4 has quite loss on microwave frequencies. After all, the “Right side up” model of the transverter is utilizing the 4-part hair pin filter with little bit different characteristics, however why not believing to Paul who already made all related measurements.

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