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In the Product Review of the IC-7800 data, some late test data was incorporated into Table 1, but was not reflected in the text. The table values for receiver two-tone third-order IMD are correct. The corrected statement in the text should say: "The two-tone third-order IMD, an indication of the capability to receive a weak signal near a strong one, was measured at 104 dB at 14.1 MHz with 20 kHz spacing and a respectable but not quite the best we?ve seen of 89 dB at 5 kHz spacing."
In "Give That Drake Receiver a New Lease on Life" [Jun 2004, pp 28-34], please note that up-to-date construction information is available on the author's Web site, www.geocities.com/hagtronics/r4.html. The following is a short summary of that information:
FAR Circuits shipped some boards with the wrong silkscreen. Contact FAR (www.farcircuits.net) if you have any questions about the boards you have received.
The VCO can be purchased directly from Mini-Circuits (www.minicircuits.com). The short kit obtainable from FAR Circuits also contains this part.
The Grayhill rotary encoder specified was a 25LB45-Q. If that is unobtainable, other substitutes that will work are the 25LB10-Q, 25LB15-Q and 25LB22-Q.
The VFD display specified is now obsolete. Digi-Key (www.digikey.com) now carries the Noritake CU16025ECPB-W6J display. This part is a pin-for-pin replacement. The LCD display remains the same.
The PIC16F876A PIC processor may be easier to find than the non-A version, but your programmer must know the difference between the A and the non-A part. Samples of this part may be available from Microchip (www.microchip.com).
In the obituary for Byron H. Goodman, W1DX [Jul 2004, p 77], the issue date of his seminal article, "What is Single-Sideband Telephony?" is January 1948.
The Web site for information on the Gatti-Hallicrafters DXpedition [Jul 2004, p 21] should be www.qsl.net/pa0abm/ghe/00ghe.htm.
