ATU for HF for the Receiver AR8200
 |
Receiver AOR AR8200
Mk 3 The receiver is
equipped with cca 60 cm long However, a much better
reception it yields (on HF) when |
| The ATU is built in a
plastic enclosure. There is the band switch (3.5, 7...10, 14...21 and 28 MHz) and the knob for tuning. The bands slightly overlap - the ATU is "general coverage". It is possible to by-pass the ATU with the switch.  |
The ATU with the bottom
cover removed. |
Schematics of the ATU:
T1 - Toroid Pramet Sumperk N05
(dark blue), ø 6 mm
T2 - Toroid Pramet Sumperk N1 (yellow), ø 6 mm
Band switch:
| Range | Turns | Toroid | Measured
inductance |
| 28 MHz | 8 | T1 | 0.72 µH |
| 14...21 MHz | 13 | T1 | 1.6 µH |
| 7...10 MHz | 13 | T2 | 6 µH |
| 3.5 MHz | 28 | T2 | 21 µH |