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<blockquote data-quote="Vipersan" data-source="post: 967731" data-attributes="member: 325666">So ..the verdict fwiw ..Still drifting when the pcb is enclosed ...ie it must get toasty inside the box.The good news is that it doesn't drift as much ...so I guess it was worth the effort.Really I need to check this on a more stable signal source ....as it may be there is _possibly_ what apppears to be drift at this frequency range ..but is actually a product of doppler shift from Inmarsat as it performs its figure 8 ?More likely though it is indeed down to the SDRplay...and the fact that I am trying to lock such narrow signals ...and AFC cannot be used in USB mode.It is undeniably better for having the TCXO instead of a standard crystal 'oven' ...but I guess I will have to put up with the slight drift ..which at least stabalises to a large degree once optimum temp is reached.I am curious though ..users of dongles or Airspy ?Just how much effort is required to maintain a stable lock on a T stream ...considering it isn't a constant signal ?Just how much tweaking and chasing do you guys have to do ?rgdsVSThe leftmost edge of the T stream data is now located at 1.534.718.000whereas this morning it was at 1.534.738.000 on SDR#</blockquote>

[QUOTE="Vipersan, post: 967731, member: 325666"] So ..the verdict fwiw .. Still drifting when the pcb is enclosed ...ie it must get toasty inside the box. The good news is that it doesn't drift as much ...so I guess it was worth the effort. Really I need to check this on a more stable signal source .. ..as it may be there is _possibly_ what apppears to be drift at this frequency range ..but is actually a product of doppler shift from Inmarsat as it performs its figure 8 ? More likely though it is indeed down to the SDRplay...and the fact that I am trying to lock such narrow signals ...and AFC cannot be used in USB mode. It is undeniably better for having the TCXO instead of a standard crystal 'oven' ...but I guess I will have to put up with the slight drift ..which at least stabalises to a large degree once optimum temp is reached. I am curious though ..users of dongles or Airspy ? Just how much effort is required to maintain a stable lock on a T stream ...considering it isn't a constant signal ? Just how much tweaking and chasing do you guys have to do ? rgds VS The leftmost edge of the T stream data is now located at 1.534.718.000 whereas this morning it was at 1.534.738.000 on SDR# [/QUOTE]

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