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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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22nd Jun 2020, 5:29 pm | #21 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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Re: Howes DcRx
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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22nd Jun 2020, 6:00 pm | #22 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,798
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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? David
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