ARRLWeb: November 2009 QST Feedback

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Digital Communication Systems Using SystemVue -- An essential guide for anyone wishing to understand digital communication systems through simulations using SystemVue.

Nifty E-Z Guide to PSK31 Operation -- A complete guide for implementing PSK31!

VoIP: Internet Linking for Radio Amateurs -- Now Shipping! -- Your complete guide to the most widely-used VoIP systems used by hams: EchoLink ,IRLP, eQSO and WIRES-II.

The ARRL Digital Technology for Emergency Communications Course -- Now Shipping! -- CD-ROM. Learn all the ways to use digital technology as an emergency communications tool!

ARRL's HF Digital Handbook -- Join the Digital Race! 4th Edition.

November 2009 QST Feedback

In “Measuring Radio Frequencies” [Sep 2009, pp 36-39] the description of vernier operation in Improved Measurement Precision was not quite correct. It should have said that the 10 divisions of the vernier scale were equal in length to nine divisions of the main scale, thus allowing the subdivision of each main scale division into tenths. In Figure 3, the correct reading is 60.4. Thanks to Al, NW2M, for picking up the error.