On Mon, Mar 21, 2022 at 5:18 AM Jerry Gaffke via <jgaffke=[email protected]> wrote:
Yup, remember the ARC5 well.? Mostly fondly. I was using an ARC5 receiver and transmitter on 40m CW while a college student in the 1970's. Designed in the 30's, they built hundreds of thousands of them in the 1940's.
It was a superhet, not a direct conversion radio. IF bandwidth was quite wide as you say because the IF used LC filters, not crystals. I believe the "Frequency of CW Oscillator" in table 3-1 on pdf page 31 of the following document tells us the BFO frequency, it varied with the receive frequency of that particular unit since they had to balance IF bandwidth against image rejection.
A fun manual to browse through if you ever warmed your hands on any of this gear. More references here:??
Jerry, KE7ER
On Sun, Mar 20, 2022 at 10:14 AM, Ford Peterson wrote:
Perhaps it is my nostalgic quest to reproduce the audio of an old ARC5 direct conversion tube radio.? Remember the ARC5?? 10 KHz wide you could hear every CW signal above and below the BFO.
