The desired signal at Q10 is always right around 45mhz.
Has to be, or it won't go through the 45mhz crystal filter
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On Sun, Aug 19, 2018 at 01:37 AM, Eric Flores wrote:
Tom, you¡¯re thinking right up my alley. I was also considering a RPi to handle digital modulation modes.?
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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.?
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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).?
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As an added plus, raspian supports Docker so each of these little services can be their own container making upgrades a breeze.?
