Hello Leif, I run into your video some 10 minutes you post it :-) I did write the post here but it was not published, strange :-) Well, I found the same behavior as you did. 30-40db ATT is required to

Of course, the extra ATT will help in this situation with the ghost signals but it will create some other problems listening weak signals. If you look the latest ICOM design (high end amateur radio tr

jdow, let's assume that you are completely right in your last post (even I am not sure how AGC play with this 50dB attenuator) According to what you write, what is then the cause of the following prob

That is true, not many hobbyist can afford yourself 2el.quad on 40mtrs but once you try it you can feel the difference. I was lucky that in our club we had 2el.quad but more like oblong shaped and a v

Alan, we do not spend the $10k in antenna mast and antennas to put the 40db attenuator on the receiver! Ruben, welcome to the club :-)..... you need a bandpass filter for each HF band you want to list

Of course, he will hit the digital saturation with the -17dbm. If we have the sensitivity -130dBm and a dynamic range of 100dB then -30dBm and higher will saturate the receiver, most probably the digi

I tried using a 3dB splitter/combiner with 30-40dB isolation between the ports but the results were disappointing.

#airspyhfplus

Hello guys, This is not the antenna matcing problem. We can clearly see from the very first Aldo post where he engaged the 10dB and the 20dB attenuator picture. When 10db attenuator was engaged the si

Mike, don't be mad :-) I have one of the engineering samples for testing (not paid) and I still testing the HF+ to find the limits, to learn the possibilities and what I can expect from this radio. I

#airspyhfplus

1. The L-band is NOT part of the ic band for the HD satelite radio, the L-band coverage we have in the AirspyHF+ is due to DAB/DAB+ standard automotive tuner coverage requirement. 2. DO expect the men

#airspyhfplus

https://www.youtube.com/watch?v=wEq0w7hg-F4 https://www.youtube.com/watch?v=ybLV6dBBU20

I will leave for a while HF+ running only with a good HF and ELF antenna so do not tune for the VHF. You can tune down to 20kHz to explore the ELF 9a4qv-sdr.dyndns.org:5555 Adam

For those not following the SM5BSZ YT channel, Leif published (always interesting) videos with 6 receivers comparison in "real antenna" environment where many questions were answered. One question fro

Hello Tag, 99% of the users will be happy to have the option when double click on the spectrum/waterfall signal to tune the main radio to that frequency. One click will do the same as up to now, tune

HDSDR support that already. Adam

Hello Leif, I second your thoughts and complete post writing. The problem is that I am the part of that culture pushing the receiver performance to the limits and beyond in the practice :-) As mention

OK, part of the "mistery" solved. If your week signal has 3db S/n with the -115dBm input than, roughly the noise floor or the MDS for the S/n 0db is -118 dBm. As already noticed, the published -140dBm

I just took the figures from the "flyer" advertising the Airspy HF+ We can find there the following figures: MDS=-140dBm IIP3= +15dBm BDR= 110dB From the fist two vaules, one can calculate the BDR: BD

There is nothing wrong in that procedure (with AGC off) and measuring the weak signl 1dB drop, just the math and published figures are not matching to the measured BDR. Maybe, even better should be to

How will then the trained professionals explain this: BDR= P1dB - Noise floor P1dB=IP3-10db P1dB=15-10 = +5dBm BDR=+5- (-140) BDR= 145dB This is a big difference, 110db or 113dB over to 145dB ? Adam