HBR 14 coils conversion to toroidal coils
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| Jun 27th 2014, 11:46 | |
cathoderayTotal Topics: 0 Total Posts: 0 |
Hi, I have studied the tube HBR 14 receiver for several months now, and I am gathering together the required parts. I have managed to obtain the IF coils from e-bay. I now turn my attention to the RF and osc coil design. I wanted to change my design to cover the whole HF 1.7-30MHz. And I wanted to use toroidal coils for the RF and Osc coils. Is there a resource around that will enable me to be able to design the RF transformers, using toroidal cores? I would want to switch these in, not use plug in coils. Possibly using reed relays. Does anyone have a view on any of my plans? I would be pleased to hear from anyone who has done similar mad things. |
| Mar 21st 2015, 01:29 | |
KF4HOJTotal Topics: 0 Total Posts: 0 |
I built some coils for non-radio purposes. I used the formulas from a book called, "LC Circuits". It's not very big, but it's really clear and concise. I bought cores for the freqs I wanted, then ran the calculations per the book. Wound them and tested them with a scope and variable oscillator (and precision capacitor). |
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