March 2007 QST Feedback
In "A Simple RF Stage for Regenerative Receivers" [Jan 2007], in the first paragraph under Circuit Description on page 28, "The selection of R1's value..." should read "The selection of R2's value..." On the same page, in the last paragraph, "RadioShack 100 mH..." should read "RadioShack 100 µH..."
In Figure 6 of "Old Amplifiers -- Boat Anchors or Bargain Basement Opportunities?" [Jan 2007, p 40], S1B's wiper is shown not connected. It should be connected to the junction of C2 and L2.
In a photo in "Product Review -- ElmerRadio Crystal Radio Receiver Kit" [Jan 2007, p 68], KB1NUN is shown soldering without safety glasses. Eye protection is required for safe soldering.
A symbol was dropped from an equation in "The World Above 50 MHz" [Jan 2007, p 81]. Under When Will the DX Start? the equation should read Rz ~ 147.
In "Audio Readout for the MFJ-209 Antenna Analyzer" [Feb 2007, sidebar p 38, 2nd paragraph], the statement about operation above 50 MHz should read: "At frequencies above 50 MHz, the signal input needs to be moved from the direct input to the prescaler input, and a jumper added from the prescaler output to the direct input."
Re the discussion of BNC connectors in "The Doctor is IN" [Feb 2007, p 57]: The other standard impedance for coax connectors aside from the usual 50 Ω is 75 Ω. In addition, the caution about different pin sizes applies just to Type N and C connectors, not the BNC.
In "Getting to Know Your Radio" [Feb 2007, pp 61-62], the discussion of transceivers with dual receivers should have included the FlexRadio SDR-1000. The latest version of its software supports two separate receivers, operating in the same band, with stereo or blended output.
In Table 1 of "Product Review -- Yaesu FT-2000 HF and 6 Meter Transceiver" [Feb 2007, pp 74-75] there are some extraneous Squelch Sensitivity numbers (for 146 and 430 MHz); these should be ignored. Also, on p 74 in the section on SSB Operation, the folks at Ten-Tec let us know that they and Yaesu do, in fact, use the same pins on their mic connectors. Be careful, though -- they do provide different voltages: 10 V on the Ten-Tec, 5 V from Yaesu.
Page last modified: 04:19 PM, 05 Feb 2007 ET
Page author: qst@arrl.org
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