RX antenna - BOG
This revision is from 2019/06/02 21:16. You can Restore it.
rev.0.1 5/2019 by Jan OK2ZAW
Feeder BOX
- This box contains of transformer 450 Ohm to 50 or 75 Ohm and protections
- Part list
PTC_F | PTC 5mm | piece 1 | PTC 100mA |
GL | Neon lamp | piece 1 | neon lamp 100V |
Tr | Transformer | piece 1 | BN-73-6802 |
TRANSFORMERS winding - very important thing!
- for 50 ohm coax feed line : 2 turns on primar (coax) and 5 turns on secondar side (loop)
- for 75 ohm coax feed line : 2 turns on primar (coax) and 4 turns on secondar side (loop)
- Transformer should have 4 + 1 turns. So you wind 4 turns and 1 more as a tap.
Common mode current choke
- Common mode current choke construction
- Wind 4 turns on one side than cross to another side of cores and wind rest turns.
Terminator BOX
- This box contains of Load resistors for the antenna and protections
- Part list
PTC_F | PTC 5mm | piece 1 | PTC 100mA |
GL | Neon lamp | piece 1 | neon lamp 100V |
R1 | Resistor 2W | piece 1 | Ohm 750 |
R2 | Resistor 2W | piece 1 | Ohm 330 |
R3 | Resistor 2W | piece 1 | Ohm 470 |
R4 | Resistor 2W | piece 1 | Ohm 560 |