sv1/sv5fri

Bitx40 is under assembly status

I have started it to assembly in the temporally case my bitx40.

Also I have loaded it sketch raduino_v1.15 by Allard PE1NWL. The sketch provides additional features such as USB, CW, RIT/SPLIT etc. but these will only become functional when the related (minimal) hardware mods are made. I have make for the moment the modification for CW carrier.

 [print_gllr id=3452184]

Problem with TVI interference

My problem was when I worked in 40m ( with power over 40 watt) my the  TV (LCD) was started automatically start up and shutdown.

I tried with differend ways to solve this problem but the result it was disappointing. After lot of  hours studing I found the solution.

The Combined Braid Breaker and High-Pass Filter.

This device prevents HF signal currents from flowing down the inner or outer of the co-axial cable. L1 has a low reactance to HF or VHF signals, thereby bypassing the interfering current, whereas C1 and C2 have high reactance to HF and VHF, effectively locking signals to the receiver. L2 provides a further short-circuit (to HF and VHF signals) across the connections on the receiver side of the filter. Continue reading…