Some strange maybe "glitches" Aurora

Thanks Len,

I got my Aurora only 3 weeks ago and it has had this "oddity" from day one. Doing a factory reset will only take me back three weeks. It is something I can easily live with for now.

I have a suspicion that since the small frequency jump only happens after the SDR has been running for a few minutes that it is related to the GPS disciplined oscillator. Because my GPS antenna is not real close to a window, it takes a minute or two to lock on to enough satellites to get a good frequency lock.

Also, if I shut down the SDR and start it up again after a minute or two, I get no glitch. I think the GPS receiver uses the very recent data it accumulated and gets a very fast lock on.

I will do some more analysis and share my findings with the community.

73, Al, K2BLA

Len,

I don't start the SDR until the power button light stops blinking and goes steady blue.

David,

When not using the Aurora, I don't use the back panel power switch but turn off a power **** which also powers up my router, external audio amp, keyer etc. In other words, it's the same as pulling the plug. This is after I use the front panel power switch and wait until the all the front panel lights go out.

The next test I am going to do it disconnect the GNSS antenna which will prevent it from switching from TCXO to GNSS disciplined oscillator. I will post what I learn.

Thanks to both of you for your comments.

I mischaracterized my power on sequence. I start the SDR after the blinking green light on the power switch becomes a steady green. The Aurora is located such that I can't easily see the power light from the operating position. This AM I watched the steady green light change to blue which I discovered occurs at the same time as the GNSS rectangle on the lower right-hand corner of the display changes from blinking to steady. At that time, I got the frequency shift. I have had the Aurora for less than 3 weeks and I am still on the learning curve and assumed the steady green was "good to go".

But I also heard the clicking of relays in the RF deck when the blue light appeared. I would assume that relays are only used for switching high power RF. I don't like the idea of hot switching relays, so my new power-on sequence is don't transmit until the GNSS is fully locked. I can live with that now since I know what is causing the frequency shift.

But my power meter full scale situation is still there. This AM on 6m I had a 600w full scale while yesterday I had a 240w full scale on 6m. Sometimes when I change bands from 6m to HF I get the 240w full scale which should be 600w. Sometimes it is 600w on HF. I can't figure out what sequence causes the wrong meter scale. The meter scale seems to be a total **** shoot. Once again this is not a big issue because I am not running over 200w at the moment as I have some antennas that I am concerned that can't handle 500w. I will investigate them in the near future.

I have solved the riddle of the wrong power meter full scale. It is not as random as I thought. If the SDR is shut down on any HF band, when the SDR is brought back up it will be on the same band as it was when shut down and the full scale will be 600w even if it was 240w when the SDR was shut down. Likewise, if the SDR was shut down while on 6m, when brought back up it will be on six with a full scale of 240w. But changing from six to an HF band, the full scale value won't change. It remains at 240w. I can get around this problem by restarting the SDR and it will come up with the correct 600w full scale. Simply put: the meter full scale is correct at start up for HF or 50MHz but it won't change on a band change from 50MHz to HF or vice versa.