Have you ever discussed car radio design with the Delco engineers? I have, on several occasions and selectivity was only one consideration. Yes, you can get better selectivity with a lower IF, but you can trade a little gain for a better frequency response with proper alignment.
-- You can't have a sense of humor, if you have no sense.
antenna.
How old are you? WLW stopped using 500 KW in 1939. You could still pick up WLW in Central Florida in the '70s, before switching power supplies and so much crap that radiates electrical noise.
-- You can't have a sense of humor, if you have no sense.
antenna.
Not that old, but WLW (and WLS) were still beacons heard in the Eastern two-thirds of the country into the '80s.
Sure. I'm not disagreeing with you.
Yup. Several of them frequented a little gathering every summer back in Oshkosh in the mid-70s and 80s and we had quite a time plying each other's trades. They were doing automotive and I was doing aviation but the design criteria were absolutely identical.
They drooled that I had the $ budget to use crystal filters at a relatively high frequency and I drooled at their weight budget of lead bricks.
IAnd they bitched and moaned that the sales department ruled the engineeering department and required them to degrade what they saw as an engineering advantage only to lose it to stagger tuning for better fidelity.
But they could drink more beer than any other group at the gathering with the possible exception of the Australian contingent.
Jim
Considering the quality of the early transistors and the operating environment, they still did good work. They also complained that the UAW blocked their attempt to make the radios easy to remove through the dash, like the later DIN versions.
-- You can't have a sense of humor, if you have no sense.
I got hooked in 7th grade when we were allowed to choose a couple elective classes for the first time, and I picked a radio and electronics class. We started out with a crystal set and wound our own inductors with 100 turns of wire on a toilet paper core. My first antenna was a coat hanger in a tree, but it didn't work too well. Then came the long wire antenna, 75 feet between 2 trees with insulators that worked much better. Later we built a tube TRF set and 250 volt DC power supply (5U4 or 5Y3). I remember using metal binding posts for the 250 volt DC output, and got whacked a few times connecting the radio to the supply while it was on.
-Bill
It taught you to turn off the power suply first, though. :)
-- You can't have a sense of humor, if you have no sense.
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