Module # 200 Crystal Filter - MAX-SSB Transceiver Project
Вставка
- Опубліковано 8 лип 2024
- Construction is complete on the MAX-SSB's Module # 200 Crystal Filter.
In this video I show the crystal filter or a.k.a. SSB filter. The job of the crystal filter is to remove one of the sidebands (either the upper or lower sideband) from an SSB signal (the carrier is usually removed by the balanced modulator). To test I used an A/B switch to compare the performance between my new filter and the existing filter in by earlier ZX-SSB-II rig. This was a quick go/no-go test but for the serious experimenter the use of a VNA or Spectrum Analyzer with tracking generator will show the true performance.
Keep homebrewing.
73 - Rick - N3FJZ
Schematic:
www.remmepark.com/circuit6040/...
Inrad crystal filter kit:
www.inrad.net/product.php?pro...
Mostly DYI crystay filter kit:
mostlydiyrf.com/qer/
AliExpress crystal filter boards:
www.aliexpress.us/w/wholesale...
Full MAX-SSB project page:
www.remmepark.com/circuit6040/... - Наука та технологія
Lovely sounding radio
Thank you!
Wow weve come a long way where we can obtain cheap filter kits.
Is there a discussion of the various i.f. frquencies used i.e. is it a function of crystal availability or transceiver design?
I know 9 MHz has long been a favorite for single conversion rigs iirc.
While the kit availability is nice I decided that Im going to slog through the math and measure them with a vna (I need to find one yet) partly to choose my own lower i.f. freq of 2 MHz or 2.5 MHz.
Yes indeed, it's very rewarding to build your own crystal filter. The MAX-SSB front panel software makes it easy to experiment with various I.F. frequencies (i.e. crystal filter center frequency) be being able to change the I.F. frequency on-the-fly directly from the Settings menu without the need to change it in the source code. Not only that, you can change the I.F. frequency real-time while listening to the results which allows you to fine-tune the I.F. to match the crystal filter's frequency exactly. 73 Rick N3FJZ.