The skirt of the crystal filter for very good single-signal performance. Practice, I have started building all my crystal filters as plug-ins so Surplus 4.0 MHz crystals are from a large batch of TV set pulls given to me by Harold, KE6TI,Īnd when I characterized them on my PVXO test unit, they had very high QĪnd less than 10 kHz spacing among the four I chose. No trace of the other sideband, and it's very quiet with respect to I also modified theĪF bandwidth of the audio amp for a wider bandwidth. The 3-pole, using parameters publishedīy Jim Kortge, K8IQY gives better signal throughput. The circuit with plug-in crystal filters. To the base design using a 3-crystal Cohn filter. The original 4-pole Cohn-typeĬrystal filter was intended to provide about 1 kHz bandwidth so JamesĬould hear more of the sounds of the band. Transmit mixer, provides the input signal for the PIC-basedĭL4YHF-designed homebrew frequency counter. Second output of the Colpitts VFO, which would normally go to the I get coverage from 7.000 to 7.095 with the VFO. Implementation of the the K1SWL-design VFO I used polystyrene caps, and Receiver, because I finally got this VFO to work right (had the tuningĭiode in backwards), and my Popcorn's VFO has issues. I decided to go with this rig, rather than the homebrew Popcorn ![]() Initially started building two receivers, the one shown here as well asĪn ugly-style construction "Popcorn" receiver" from the web I bought and assembled one of Dave's SW-20+ kits awhile back, and I found the performance to be excellent. The receiver is based on the SW-40+ designed by Dave Benson, K1SWL and featured in ELMERġ01, using homebrew CAD-produced PC boards for the VFO and the So, Iĭecided to put off the plans for a 40m transceiver and build just the SKN Special I built a couple of years ago in his room, and James startedĬopying CW over the air and sending the characters back on a homebrewĬode practice oscillator I built for him. The homebrew ELSIE LC meter one night a couple of years ago in my workshop. Surprised to hear my grandson James repeating the "boot up" CW sent by
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