Re: SDR dongle for spectrum analyzer with signal from Bitx40?
John McFadden <johnamcf@...>
toggle quoted messageShow quoted text
I think most would have the SDR dongle attached to the computer outside the Bitx's enclosure, so they could use the dongle with other antennas for different applications.
I was going to run the coax from the cap/tap on the PCB to a BNC panel mount on the exterior and then connect the SDR at will. For example, I may not want to bring the SDR, computer, and monitor while doing POTA.
On Dec 13, 2017 2:47 PM, "Jerry Gaffke via Groups.Io" <firstname.lastname@example.org
The really cheap SDR dongles (meant for DVB-T television reception, $10) can get down to 30mhz without a downconverter (as I recall).
They only have an 8bit A2D converter, so reception with the uBitx receiver would have much more dynamic range.
The uBitx has a 45mhz first IF which should be within reach for the DVB-T dongle for displaying a spectrum of what's in the band,
tap in the dongle just prior to the 45mhz crystal filter so you can see more than a few khz worth. Downside is this may inject a lot of hash
into the uBitx receiver, good luck getting rid of that. Maybe a buffer amp of the 45mhz IF inside the uBitx enclosure, a coax going out
to a separate box for the dongle?
On Wed, Dec 13, 2017 at 10:27 am, Arvo KD9HLC wrote:
What would be the advantages of using anything else for RX? (I'm kinda new at all this.)
And if one is going to set up a spectrum analyzer that (from what I understand from the original post) picks off the incoming signal inside the BitX, why not just use the SDR for RX?
Join BITX20@groups.io to automatically receive all group messages.