I did a board layout using mostly SMD components. During the layout of the narrow (1KHz.) filter, I found it would be easier to use leaded 2n3904s instead of the smd components. Just too lazy to redo everything I had already finished to use the smd part.
I had ordered a batch of 30 12MHz. crystals, and using my SNA to match them, I got 9 that were within about 100 Hz. of each other.
After building this half of the board I decided to test and see what kind of a frequency response I had.
Using the SNA jr. to check the bandwidth,I found the signal at just a few KHz. below 12MHz. Narrowing the sweep range I found a nice peak and a bandwidth of about the 1KHz. required. From everything I have read, for a Spectrum Analyzer filter you want more of a peaked response than that for a SSB filter. So this response looks like it will work. After I finish the board I will check the responses with the Chinese SNA that has options for measuring bandwidth. But, the SNA jr. is so easy to use on the bench it is what I usually go to when building.
I wound some toroids and tried to tune the segments by adjusting the coil spacing on the toroids. This turned out to be a large pain, and I could not get them adjusted to the bandpass I wanted.
I had some 1.8uH molded RF chokes and some small 60pF trimmer capacitors that would fit on the board. I had placed pads for additional capacitors if needed, but found that I could tune the segments without adding any additional capacitors.
After finishing this filter I added the relay switching circuitry. The relays I had were through hole, but I bent the leads and trimmed the length so I could solder directly to the elongated pads I had on the circuit board.
After completing I checked the bandpass filters. The narrow crystal filter was about 1.1 kHz at 6dB. and the wide band filter was 456 kHz. at 6dB.
Just need to solder some .020" circuit board material as a shield around the assembly and on to the mixer stage.