Archive for July, 2013

Summer at it’s best

July 26, 2013

Summer is in full swing here in mid ohio. We attended the radio hamfest in Van Wert Ohio and look forward to the Findlay hamfest later. Summer usually brings on lots of activities other than radio. We are working on stocking the new all metal chassis 6V6/6L6 little oscillator/transmitter kits. These have a bottom cover made of aluminum like the chassis itself, but with perforated holes for ventilation. We have measured power out at various plate voltages. The output ranges from about 2 watts at around 200 VDC to over 10 at 350 VDC through the link coupling which matches 50
ohms impedence. The link coupling keeps the kit simple and less expensive that a pi-network. Besides most modern radios use 50 ohms impedance output. My thinking is to supply the kit with a companion power supply that will provide the filament voltage of 6.3 VAC as well as 200 VDC for the plate.
This is plenty of power for some great CW contacts. Those more experienced would probably prefer to build their own power supplies anyhow. You can save a lot of money on used
transformers, chokes, and so on. Have your priced new transformers lately?
Enjoy your summer. Remember http://www.pastimeprojects.com when
cooler weather brings back ham radio building projects to the old work shop.. 73 ES BCNU! Glenn