Hi all, While this list tends to concentrate primarily on vintage AM equipment, I'm sure some of you build solid-state projects as well.
Some of you may be familiar with Harry Lynthall's (SM0VPO) web pages. He has a wealth of information for various projects and building blocks, both solid-state and vacuum tube. One of the "building block" projects that caught my eye was a superhet receiver that uses the ZN414 / MK484 chip for the IF amp and detector. He uses cheap IF transformers from $1.50 throwaway radios as well. Considering the extremely high gain of the MK484 chip, I was thinking of doing some modifications to make an inexpensive 80 meter AM receiver, completely from junkbox parts. I was curious to know if anyone has tried using the 484 as an IF amp before. The chip is typically used as a TRF receiver for the broadcast band, but it should certainly function very well at 455K. The cheap BCB IF transformers should do an adequate job in limiting the bandwidth to less then 10k, which should do fine for 75 AM. Considering this is just a single conversion, would it make any difference in using high or low side injection for the local oscillator / VFO? Thanks for any thoughts. 73 Joe Bento N6DGY Pleasant Grove, Utah
