Airspy HF+ SDR Receiver with Mini-Whip Active Antenna and External Attenuator 

Thanks. Merry Christmas and Happy New Year to you too!

I am glad to hear that you will made the attenuator. Do not forget to send some pictures and you experience when you finish it. 73!

It's an excellent thing to have in the arsenal when doing other kinds of testing as well.

Here is how I have made my low cost high performance RF Step Attenuator: www.qsl.net/z33t/rf_step_attenuator_eng.html

It is traditional macedonian folk music

One thought still bothers me... How can we know the real signal level if the antenna used is active? Shouldn't be used a 20 cm ferrite loopstick antenna like those ones listed by eBay user playlodfm?

It is a good practical tip to keep the maximum signal level not more than -10 to -15 dBfs, in order to not overload the receiver input stages and analog-to-digital converter (ADC)

www.qsl.net/z33t/rf_step_attenuator_eng.html

@@milekokotov1964 Thanks for the link, this is very useful information. I am confused about the types of switches. If I understand correctly, I need DPDT and Switch Function - On-On. www.littelfuse.com/~/media/images/technical-resources/commercial-vehicle/switch-pole-throw-diagrams/dpdt-on-on-jpg.jpg

Yes @@Ali-ms8zv. Here is one example: www.ebay.com/itm/5-x-Mini-Toggle-Switch-DPDT-ON-ON-2-Position-Blue-6mm-12V-110V-220V-MTS-202/110895582147?hash=item19d1e44bc3:g:f20AAMXQ9u1RE3qu

@@milekokotov1964 Thank you for the explanation

I am comparing Airspy HF+ with other SDR-receivers few days. It will be video soon. It is very good indeed!