I have a copy of the 1992 Communications Quarterly article "Improving the Drake TR-7" by Scott Prather, N7NB
The features provided are - Full receive coverage from 10KHz to 30 MHz with no reduction in sensitivity across the entire range. - Smooth, quiet, full break-in (QSK) CW operation at full output power. - A major improvement in the S/N ration of weak CW signals. - A reduction in cooling fan noise, because the fan operates only when it is needed. Along with the article is a set of 4 circuit boards I purchased from Far Circuits: - Front-end filter card - QSK card - Audio filter card - Fan control card If you have any interest, please contact me off list. Tom, AG9X
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