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Security (anti-spam) Question: How many dits in 72?
Dits
Description
Record #
28
RevDate
Mon, 13 Dec 2010 16:22:57 -0600
Details
An extremely stable VFO designed for 40 meters with a 4.9137 MHz IF. Actual VFO freq is about 2100 KHz. Entire circuit was built on a copper clad board. The main tune inductor uses 28 GA magnet wire and is mounted (glued) on the copper board using 1/16 inch double stick tape. The T68-7 toroid is elevated about 1/4 inch above the copper. Total drift after 5 minute warm-up from cold start measured at 20 Hz Circuit as shown tunes from about about 7025 to 7050 KHz using a 4.9137 MHz IF.
Schematic=
w8diz_vfo.gif
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