On 30/03/16 16:30, Marcus Müller wrote: > Hi Daniel, > > haven't made experience with any of these upconverters; but: > > The really temperature-sensitive aspect of an upconverter is probably > the oscillator, not the mixer. So the trick might really be keeping > your upconverter in the same environment as your SDR receiver (assuming > both don't have overly well temperature-compensated or oven-controlled > oscillators), as that will just as much limit your frequency accuracy. > > Mixer circuits do exhibit conversion loss that tends to get worse with > rising temperature, but that'll not distort your signal much. >
OK, so keeping the mixer cooled will help reduce loss but has nothing to do with frequency stability? > The core question here is whether you'll deterioriate your system > performance if you keep your upverter far from your antenna; my guess is > that you'd have an LNA close to the antenna, anyway, so keeping the > upverter's oscillator warm and cozy near your SDR device won't be that > complicated, probably. > That is definitely quite a relevant point, where I live at present the indoor temperature can often be a lot lower than indoor > That brings one down to the question whether you have the chance to use > the same oscillator for both your SDR device and the upconversion; that > way, you'd only have to worry about one device drifting under any > circumstance. Does your device give you the chance to couple out a clock > or maybe transmit a sine? > For people using low-cost RTL-SDR dongles that might be more than they can expect For the proper SDR boards (e.g. USRP, BladeRF, HackRF) is this feasible? _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
