April 2007 QST Feedback
In Table 1 of "Product Review -- The ICOM IC-7800 Revisited" [Mar 2007] the receiver data was inadvertently duplicated in place of the transmitter data on page 65. The review posted on our members Web site is correct, and can be found at www.arrl.org/members-only/prodrev/byissue.html. As it happens, the transmitter data from the original IC-7800 review, Aug 2004, pp 64-70, is virtually unchanged since the major changes since then were in the receiver.
In "Calculating Antenna Headings" [Mar 2007, pp 44-46] the note about long paths at the top of the middle column of p 46 should say: "To find the long path for headings that are less than 180°, add 180° to the heading. To find the long path for headings that are more than 180°, subtract 180° from the heading. Therefore the long path to London is 51 + 180 = 231°."
John, G3BST, a former maritime radio operator in the days of spark transmitters, provided a correction to the Jan 2007 "Hamspeak," column, p 101. He notes that the term interrupted CW was used to denote radiotelegraphy that was "chopped" to simulate the sound of spark transmitters to allow reception on early receivers that were not equipped with a beat frequency oscillator (BFO).
Ronald, WA6LBB, notes that in "Old Amplifiers -- Boat Anchors or Bargain Basement Opportunities" [Jan 2007, pp 37-41], while Figure 4 shows a half-wave voltage doubler, the Heathkit SB-220 series amplifiers actually used a full-wave doubler as shown in The ARRL Handbook, Figure 17.7.
In "The FCC-2 Frequency Synthesizer" [Feb 2007, pp 31-35] Figure 1 shows two capacitors as C14. The one with the value of 3.3 pF should be shown as C15. It is correct in the parts list.
A couple of gremlins snuck into The Considerate Operator's Frequency Guide [special section, March 2007]: Automatically controlled data stations are found from 7.100-7.105 MHz and 14.060 is the QRP CW calling frequency.
Page last modified: 12:07 PM, 02 Mar 2007 ET
Page author: qst@arrl.org
Copyright © 2007, American Radio Relay League, Inc. All Rights Reserved.
