Blitzortung.org Forum

Dear team 
I have a question.
I have the mini version at home and works nicely.
But I am also as Hamradio transmitting on 136 kHz 474 kHz and HF and VHF frequencies. I noticed that this gives a disturbance on the mini receiver.
Is this Harm full for the preamplifier , so I should disconnect the preamplifier  or using band pass filter for the mini or is this ok and the AGC can handle it.
The output power of the transmitters is  max 100 watt.
Thanks
ok8leo

(2025-07-24, 08:28)Ok8leo Wrote: [ -> ]Dear team 
I have a question.
I have the mini version at home and works nicely.
But I am also as Hamradio transmitting on 136 kHz 474 kHz and HF and VHF frequencies. I noticed that this gives a disturbance on the mini receiver.
Is this Harm full for the preamplifier , so I should disconnect the preamplifier  or using band pass filter for the mini or is this ok and the AGC can handle it.
The output power of the transmitters is  max 100 watt.
Thanks
ok8leo

Is your preamp the 23.1?  If so, see the schematic:
[attachment=5086]
The signals from the antennae smack immediately into a substantial diode chip.  It absorbs everything in excess of maybe 1.4 volts.   So there is no danger of your damaging the preamp.