Quote:
Originally Posted by ukcol
Thanks Peter I shall look forward to that.
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Here are the coil details, as promised. I used Ferroxcube ferrites - had Electrovalue still been with us I would have given the Siemens (Epcos) part numbers instead, as Electrovalue were Siemens distributors. For Ferroxcube, try BFI Optilas, which a Google search will find.
One matter - I've just noticed that L5 on the circuit diagram has the wrong value - it's 137µH not 90µH.
L1: AF Filter Coil 53mH
Core RM6 (Gapped) Al=630nH e.g. Ferroxcube RM6S/I-3H3-A630
Bobbin RM6 single-section e.g. Ferroxcube CSV-RM6S-1S-6P-G
Clips RM6 (1 pair) e.g. Ferroxcube CLI/P-RM6
Winding: 292 turns 0.18mm Grade 2 enamelled copper wire
L2: Oscillator Coil 23µH (for around 783kHz)
Core RM5 (Gapped, with hole for adjuster) Al=160nH e.g. Ferroxcube RM5-3D3-E100/N
Bobbin RM5 single-section e.g. Ferroxcube CSV-RM5-1S-6P-G
Clips RM5 (1 pair) e.g. Ferroxcube CLI/P-RM4-5
Adjuster Ferroxcube ADJ-RM4/RM5-BROWN
Winding: 12 turns in 1 layer 0.355mm Grade 2 enamelled copper wire
L3: RF Tank Coil 22.5µH (for around 783kHz)
Core RM6 (Gapped) Al=100nH e.g. Ferroxcube RM6S/I-3F3-A100
Bobbin RM6 single-section e.g. Ferroxcube CSV-RM6S-1S-6P-G
Clips RM6 (1 pair) e.g. Ferroxcube CLI/P-RM6
Winding: 15 turns in 2 layers 0.63mm Grade 2 enamelled copper wire
L4: Modulation Choke 283µH
Core RM8 (Gapped) Al=315nH e.g. Ferroxcube RM8-3F3-A315
Bobbin RM6 single-section e.g. Ferroxcube CSV-RM8-1S-8P-G
Clips RM8 (1 pair) e.g. Ferroxcube CLI/P-RM8
Winding: 30 turns in 4 layers twin 0.5mm (bifilar wound) Grade 2 enamelled copper wire
L5: RF Output Matching Coil 137µH (for around 783kHz)
Core RM8 (Gapped) Al=100nH (High frequency low-loss grade) e.g. Ferroxcube RM8-3F3-A100
Bobbin RM6 single-section e.g. Ferroxcube CSV-RM8-1S-8P-G
Clips RM8 (1 pair) e.g. Ferroxcube CLI/P-RM8
Winding: 37 turns in 4 layers twin 0.4mm (bifilar wound) Grade 2 enamelled copper wire
If anybody is seriously interested in replicating my circuit, send me a PM -I may be able to help out with a small quantity of coils. (Though I don't want to step on Ed Dinning's toes here!)