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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 22nd Jun 2020, 5:29 pm   #21
G6Tanuki
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Default Re: Howes DcRx

Quote:
Originally Posted by Aub View Post
I always felt a bit annoyed when designs for simple receivers seemed to all start using toroids in the early eighties. I much preferred the good old Aladdin style formers.
I rather like toroids: if designed properly their field-containment effect largely does away with the need for screening-cans [I always loathed the kind of cans used on IFTs etc where there were 2 metal tabs bent under for the former's fixing-screws to pass through. No way to remove the can without desoldering all its legs first!]
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Old 22nd Jun 2020, 6:00 pm   #22
Radio Wrangler
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Default Re: Howes DcRx

Classic IFT construction offers two major advantages; you can have adjusters, and you can have two coils with limited coupling to form a 2-pole resonant filter. Automated winding is another advantage, but fancy machines caught up for moderate sized toroids, still not as easy, though.

Both are hard acts to do with toroids.

The changeover to toroids also coincided with receiver design moving from IF strips with multiple resonators distributed down them to block filters. But which was the chicken and which the egg?

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