开云体育

Hello all,

I am new to the TinySA community (just an amateur hobbyist), and recently ordered a TinySA from Amazon ("SDRGEEK").? I commented on a post that Erik made on youtube, and he stated that this was likely a legit product based on my serial number, and added that I should post here with some questions I had about mine (copied verbatim from my youtube video comment below)...

First off, the firmware that came installed on my TinySA was 1.1-52, and I backed this up prior to upgrading...

When I installed the latest firmware (1.3-265), I no longer see the typical peaks when it first starts up (with antenna connected) for the local FM radio stations that I was seeing before I did the update. I completed the self test and the level calibration successfully after the firmware update. I need to recheck this again, as I am typing this from my "noisy" (RF) basement to see if they appear upstairs. In this basement environment, I just see some peaks around 244 MHz (which I think may be from the internal clock harmonics?).

Today, I downgraded the firmware (restored the backup I made) and those peaks are showing up again in the 88-108MHz range, so this does seem to be something that changed in the firmware between the installed version and the latest version.? Is this something to be concerned about, and is there something in the default settings that changed to cause this?? I took a photo of the screen showing the condition prior to the downgrade (using latest firmware), and another after the downgrade (using 1.1-52), and attached to this post.

Thanks!

Do you have the small antenna connected?
With the new FW, can you enable the cal output, connect to the low input and check the level?
The signal at 96MHz with the old FW is probably an MCU spur that is eliminated by the new FW
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Yes - the antenna was connectd in both images - sorry if that wasn't clear.

I took some time today and took equivalent pics in several configurations with both firmware versions, placed in roughly the same location.? I am attaching them - hopefully the filenames are self-explanatory --?
with antenna (multiples with different marker positions), with NO antenna, and with the 30Mhz cal output turned on.

The levels for the 30Mhz signal were:
FW1.1-52: -25.4 dBm
FW1.3-265: -25.0 dBm

I was running under the assumption that those were real FM signals, as the high peak (old firmware) was at about 95.7 MHz (which is a local FM broadcast freq).? I also found that when I brought the TinySA outside my home office/work area peaks on the right end settled down a bit.? There is a LOT of stuff in that office (3D printer which was actively printing), multiple PCs, LED lighting, IoT stuff, etc.

Two additional "newb" questions on this:
- What does the 'afrgnb' represent between the LOW annunciator and the FW version on the display?
- I noticed a difference in the display output between the two firmware versions (yellow top text, and one showed a prefix of '1T' and the other was '1R').? Is this a sign that I may not have had identical settings between the pics?

Doh!? Forgot to attach the images...?

The new FW is better able to suppress spurious signals. All looks good

On Thu, Jul 22, 2021 at 05:07 AM, spiff72 wrote:

Is the white versus yellow text for the top of the screen meaningful, or was that just a firmware update change?

Just a FW update
?
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