Linear amplifier HF - ARI Pontassieve

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Linear amplifier HF

Le attività > Autocostruzioni 4

Work in progress

            SCHEMA DI RIFERIMENTO di EW1MM - UA6LFC







http://www.nd2x.net/gs35-HF.html


Elenco componenti

RFC1 – 25 bifilar turns of 2 mm dia enameled Cu wire on ferrite rod (length 150 mm, dia 8-10 mm).
RFC2 – 0.5 mm dia enameled Cu wire on 30 mm OD ceramic form, 70 mm long close spaced; then 17 more turns spaced 1 mm at anode end. The total inductance is 195 microHenries.
RFC3 – 2.5 mH, 0.3 A RF choke.
L1 – 10/15 m – 3.5 – 4 turns, 10 mm by 1 mm copper strip with 1 mm space between turns, 40 mm ID. Tap for 10 meters at 2.5 turns from C1 end of coil.
L2 – 20 m – 5.5 - 6 turns of 6 mm dia Cu tube with 6 mm spacing between turns, 50 mm ID.
L3 – 40/80/160 m – 20 turns of 2.5 mm dia Cu wire on 75 mm OD ceramic form, 2.5 mm turn spacing.
To cover the WARC bands one must use a 9-position switch for S2.
PA1 – 0-1.5 A dc meter – Cathode Current.
PA2 – 0-0.5 A dc meter – Grid Current.
D1…D7 – Russian D815A Zener diodes – 5.6 V, 8 W (Use a heat sink).
D8 – Russian D817A Zener diode – 56 V, 5 W (No heat sink is used).
D9, D10, D11 – 1N4007 or 1N5408.
C1 – TUNE – 500 pF maximum, 3-4 mm spacing (or combination of 170 pF variable capacitor with fixed RF type high voltage 100 pF for 80 m, 330 pF for 160 m capacitors and RF relay).
C2 – 2200 pF, 10 kV RF type doorknob capacitor.
C3 – LOAD – 2000 pF maximum, 1.5 kV air variable.
C4 – 1000 pF, 5-kV doorknob capacitor.
C5 – 2200 pF, 5-kV disc-ceramic capacitor.
C6 – 0.01, 1 kV disc-ceramic capacitor.
C7 – 0.01, 500 V MICA.
C8, C9 – 0.01, 1kV disc-ceramic capacitors.
K1 – RF type relay, 24 V dc coil, should be rated for 100 W.
K2 – RF type relay, 24 v dc coil, should be rated for 1500 W.
K3 – relay, 24 V dc coil, 2 A contacts.
K4 – relay, 24 V dc coil, 1 A contacts.
S1 – switch, should be rated for 2 A.
S2 – 5-position (9-position if WARC bands used), high-power ceramic RF switch.
Radio parts used in external High-Voltage Power Supply (Fig.2 below)
S1 – Power relay 10…15 A contacts.
K4 – relay, 220-V ac coil, 10…15 A contacts.
K5 – relay, 220 V ac coil, 5 A contacts.
T1 – 3…4 kVA plate transformer, 240 V ac primary, secondary 2400 V ac at 1 A.
T2 – filament transformer, 240 V ac primary, secondary 12.6 V ac at 4 A.
D1…D20 –– 5 diodes.

http://www.nd2x.net/gs35-HF.html


 
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