The Local Oscillator frequency.
On Monday, March 25, 2019 at 7:39:08 PM UTC-4, kobuki wrote: > > Sorry, but what is "Oscillator Frequency"? It's not the tune-in frequency, > I assume? > > On Tuesday, March 26, 2019 at 12:36:35 AM UTC+1, rich T wrote: >> >> Kobuki >> >> I use Kalibrate to determine the ppm. Works pretty good. The formula I >> used was ppm * Oscillator Frequency / 1000000. >> >> Rich >> >> On Monday, March 25, 2019 at 7:21:40 PM UTC-4, kobuki wrote: >>> >>> Absolute error, based on PPM: measured_ppm / 1 000 000 * F - for F = 911 >>> MHz or F = 911 000 000 Hz it gives 225.928 Hz. But any decent AFC should >>> correct differences of 5-10 kHz with ease, or even more. This is negligible. >>> >>> What are you calibrating with and what is the reference frequency >>> source? Just out of curiosity. >>> >>> On Tuesday, March 26, 2019 at 12:13:41 AM UTC+1, rich T wrote: >>>> >>>> Luc >>>> >>>> The dongle I'm using that been running for over a week now, so warming >>>> up should not be a issue. The dongle ppm error is + 0.248. I believe >>>> that >>>> is about 5 Hz, but I might be wrong. I also tried the RFM69 sources >>>> frequencies and get the same results. Let go back to the original fc and >>>> change the timing just see what happens. >>>> >>>> Rich >>>> >>>> On Monday, March 25, 2019 at 6:45:05 PM UTC-4, [email protected] >>>> wrote: >>>> >>>>> Rich and Paul, >>>>> >>>>> I am puzzled by the fact that after the first received message on >>>>> channel zero 5 messages in a row are missed AND after the next init NO >>>>> SINGLE message is missed for a long period.. >>>>> >>>>> I Don't think it has to to with warming up of the dongle, but it can >>>>> have an influence. >>>>> >>>>> Another possibility is a to precise (time-out) timing. This is >>>>> important when the program has to scan more than one transmitter but is >>>>> less critical when only one transmitter is read. >>>>> >>>>> Could you both try to add the -ex parameter for extra loop timing? >>>>> >>>>> Try values such as '-ex 65' to '-ex 200' (ms). Maybe the percentage of >>>>> missed signals will drop then. >>>>> >>>>> Luc >>>>> >>>>
