Ceramic resonator VFOs

David W Searle ZL3DWS sent me a very useful link about the use of ceramic resonators in VFOs. These can be pulled more than crystals but the pulled stability is still better than a VFO. I am trying to use these in a mixer-VFO for my 10m DSB rig. See the webpage by Jack Ponton GM0RWU at the address below. I think taking the output differentially from a tuned circuit across the output pins of the NE602 would be better with a simple link winding down to 50 ohms. http://eweb.chemeng.ed.ac.uk/jack/radio/projects/resnote3.html .

AA1TJ's 1 transistor transceiver

Take a look at Mike's neat 1 transistor VXO controlled 80m 80mW transceiver, The Reggie, which uses a passive RX with the VXO acting as LO for a heterodyne mixer. He's worked some decent distances with this modest little rig. Mike has a great website with plenty of other fine ideas. The little Reggie circuit continues to evolve so keep checking back to his site.

http://mjrainey.googlepages.com/reggie

Update 19/1/09: Mike tells me he has measured the MDS as -87dBm (using a sig gen and a stepped attenuator/20dB pad) which is pretty remarkable for essentially a passive RX using a switching mixer. It implies Mike can hear around -90dBm clearly in his ST3 headphones.