I got tired of popping the hood and manually changing my VXO crystals. First I tried to switch the rocks using a rotary switch on the front panel, but I think the leads were too long and the output was kind of squirrely. So I dug around in the junk box and found a 12 volt double pole double throw relay. I put the crystal sockets across the two poles and ran leads from the armature terminals to the crystal terminals. I use the rotary switch to activate the relay. I cover about 41 kHz of the 17 meter band with the two crystals.
17 meters has been in great shape. On November 16 I had a very nice contact with Syd, ZS1TMJ in Glenwilliam, South Africa. That's about 8000 miles on 5 watts SSB.
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20
Posts
Nice! What kind of antenna did you use for the South African contact?
ReplyDeleteNice QSO Bill!
ReplyDeleteThe antenna was an ordinary half-wave dipole, about one half wavelength up, in the trees, fed with RG-58 coax.
ReplyDeleteGood QRP DX OM. Whatabout 2N7000s or ordinary transistors for switching those crystals?
ReplyDelete