Re: Si 570 programmers ? +/- 3500 ppm tuning
- --- In email@example.com, "tigger" <aj-smith@...> wrote:
> But you do not say whether you have ever observed an automatic re-calibration or a 10ms dropout. I think the omission suggests you have not, though John (whom you quote) seems to assume that the recal happens (probably from reading the datasheet rather than from actual experience).I have two Si570's in the radio... one for Tx freq (direct 144 MHz) and one for Rx LO (4 x 10.7 MHz). The Rx one is solid for days. The Tx will intermittently reset, not when tuning it with the shortened tuning command but rather at odd times...maybe related to a power glitch(?).
I have not noticed "a 10ms dropout".
> Another point - in my system I re-establish the centre frequency by doing a full register write including freeze/unfreeze/new freq. I know that this produces a 250us glitch. In your 23320 message there is a suggestion that only N1/HSDIV/RFREQ/new-freq is required. Can you confirm that this is this the case ? If so, omitting freeze/unfreeze might reduce the glitch further. Can you comment on this ?Yes, the shortened routine omits Freeze, UnFreeze, and Assert_New_Freq.
> Any G4OEP
73, Sid W7QJQ