Kenneth, what is the frequency?
Posted on 01/05/2021 8:12:07 AM PST by tbw2
A while back we heard a suggestion that it may be possible to use the 5th harmonic on R820T2 RTL-SDRs to receive frequencies much higher than the normal 1.766 GHz limit. After mentioning this to to Hayati Augen he has recently managed to implement this driver hack, and now R820T2 based RTL-SDRs can tune all the way up to 6 GHz if Hayati's experimental driver branch is used.
Before everyone gets too excited, we need to temper expectations as sensitivity reduces the higher the frequency so an LNA may be required, imaging/aliasing is a major problem, and you will absolutely require a ~1.7 GHz high pass filter to be able to actually see any signals as otherwise the lower bands drown everything out. So when combined with the relatively small bandwidth of the RTL-SDR, the overall usefulness of this feature may be very limited, however it is great that this option at least now exists.
In order to actually receive anything, you will need to filter out all signals below about 1.7 GHz, otherwise they will alias on top of your desired frequency. We used the VHF-1760+ from Mini-Circuits. There are other options available as well, however this filter seems to work well as long as the signals below 1.7 GHz are not too strong.
(Excerpt) Read more at rtl-sdr.com ...
Tuning an R820T2 RTL-SDR up to 6 GHz via a Harmonic Mixing Driver Hack
https://www.rtl-sdr.com/tuning-an-r820t2-rtl-sdr-up-to-6-ghz-via-a-harmonic-mixing-driver-hack/
Yea, what he said.
Keep your paws off my dongle...................
“Before everyone gets too excited”
Too late! Too late!
I’m telling everyone!
Those little dongles can be fun :-)
I have two coming from banggood.com right now.... less than 40 bucks including shipping...
Thank you, hope this weekend to have a chance to study it.
I’m interested in satellite receivers. And microwave transmitters.
I like that site, it’s what got me into SDRs and ended up getting a Raspberry PI and using it track airplanes via ADS-B....
Then you might like:
GRCon18 - RF Ranging with LoRa Leveraging RTL SDRs and GNU Radio
https://www.youtube.com/watch?v=vBES6Baxc0M
Along these lines?
BSides Canberra 2018: A low cost guide to satellite listening
https://www.slideshare.net/posheaslideshare/bsides-canberra-2018-a-low-cost-guide-to-satellite-listening
Is this a gun thread? Sounds technical....
Or like this: cheap microwave filters by WA5VJB
https://www.wa5vjb.com/references/CheapMicrowaveFilters.pdf
What caliber does this come in?
40 Watt range?
thanks
Kenneth, what is the frequency?
I saw them in concert.
AC/DC, not Danny boy.................
Thanks, I am not sure what to do with this yet, but in my efforts to prep for unknown future, having comm options is something I have been trying to get around to. I want a HF Ham setup but other than having the operators ticket, not sure where to begin from scratch. Also have some VHF handhelds but not really making use of them at the moment.
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