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Re: Modular uBitx - "Ex: Harmonics"

Eric Flores
 

Tom, you¡¯re thinking right up my alley. I was also considering a RPi to handle digital modulation modes.?

But, I am also considering using it to run an RTL-SDR for all of the RX work and tap the signal from the 1 mixer (just off C10 and the base of Q10, and completey removing R10, R11, Q10) and send the RX strait to RTL w/ small piece of coax. The IF should be 46Mhz-75MHz (for 160-10m) right there, which is well within the range of the dongle so you wound not need a hamitup upconverter. The one issue that might prevent this is I can¡¯t seem to get rid of a 1/2 second delay in the RTLs.?

I was also considering having a headless ubitx so I can have the radio in a shack and operate from the house, which could end up being a few hundred yards away. It would be controlled via a network connection to either another RPi or a computer (possibly via rtl_tcp for RX control, a REST API for general radio control and an RTP stream for TX voice).?

As an added plus, raspian supports Docker so each of these little services can be their own container making upgrades a breeze.?

Eric

On Sat, Aug 18, 2018 at 21:57 Tom, wb6b <wb6b@...> wrote:
The reason Raspberry Pis are so inexpensive is they take advantage of the price advantage of using basically the same processor that is used in hundreds of millions of radio transceivers, already. (smartphones)?

So, a Raspberry Pi finding its way back into another transceiver (uBITX) does not seem too far of a stretch. Not necessarily for SDR I/Q processing, but running digital modes in a small radio package is a good thing. Also, there are some audio/microphone compressor/equalizer software packages that can run under Linux that might improve your SSB transmit audio without needing to add an additional analog compressor board (albeit a second USB sound adaptor).

On the RFI noise front, I found a metal case for the Pi that will go inside the bigger transceiver case.?

I like?Allison's idea of using Android tablets as a controller for the uBITX. I'm, also, looking into running a web server on my Raspberry Pi so I can operate my uBITX from either an iPhone or Android (without installing an App). Possibility borrowing a little from the web interface of OpenWebRX.? Some browsers may be capable of sending realtime audio back to the uBITX. I'm looking at the protocol that supposedly allows this.?

I've seen some commercial HF radios that let users send/receive text messages from their Smartphones. That, on Ham Radio, would certainly attract a new younger group of Amateur Radio operators to the hobby.

Tom, wb6b

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