Hi all Just wondering if anyone could please advise what would be recommended operating parameters for DCP68 device based revised W7IUV preamp circuit for optimal IMD performance (as per http://www.mtmscientific.com/preamp.pdf ).
The intended use with Flags and other small RX antennas in a typical urban environment for 160m, and potentially for 630m. Built it, appears to be working OK, initially had too high collector current to start with, ended up with R3=4.3K for circa 20db gain that does not appear to drop off too fast, and keeping collector current just above 60ma as otherwise it looks like DCP68 is likely to evaporate from the heat.. Tnx, Tomas VK2CCC _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
