Do you have DAB in your area by any chance? Here in Europe, any DAB "block" has a centre frequency that by definition must be well controlled to a very high level. The idea is hown here: https://qirx.

#airspyr2

Grump - not even one beefcake image. {^_-}

#airspyr2

May as well make it 5 kHz... https://ukradiotransmissions.wordpress.com/2019/02/06/new-8-33khz-airband-channel-spacing-frequencies-a-conversion-chart-and-explanation/

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Ignore the mode being NFM I had started SDR# up just to get a picture of the settings. If I set the step to 25kHz for step size I miss a crap ton of traffic that it just scans over. The saved frequenc

#airspyr2

0.5 what? -0.1 what? You're making it bloody difficult to help you, you should know. Do you understand anything about frequency tolerances and how to calculate them? If you EVER encounter a signal tha

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2 should read: ---------Airspy.US Your USA source for quality SDR products! www.Airspy.US NOTE: This email address is NOT MONITORED. If you want to email us use our normal email address.

#airspyr2

We see at least 3 issues: 1. Why are you using NFM in the airband? 2. Your saved frequencies are on on-frequency. 3. Your step is 8.33 kHz. That means your first step will be 33.333 Hz low, the second

#airspyr2

Airband radios in planes and control towers are not frequency reference standards. Some can be significantly off frequency. Do not try to judge the calibration of your device using airband. If you pre

#airspyr2

Every frequency has a different offset one could it +0.5 next could be -0.10 After more messing around with SDR# & the R2 I am now noticing this is only happening on airband VHF channels and 1G channe

#airspyr2

Here in the USA, we are operating on 25kHz spacing. ATC may advise me "Contact Boston Center on 134 decimal 42, good day..." On the B-737NG, I would tune 134.42 in the standby window, and press the XF

#airspyr2

Without numbers diagnosis is out of the question. Note that there are equipment tolerances on AirSpy AND the aircraft radios in question. {^_^}

#airspyr2

I don’t know about scanning, but I use the excellent AirSpy R2 on SDR# to monitor 4 fixed frequencies in the 160MHz railroad band. When I start SDR# after a reboot I find that I must tweak the frequen

#airspyr2

If it is the Airband and 8.3333kHz channel spacing, there is a "step" pull down at the top of SDR# you could change this from 5kHz to 8.3333kHz as the step size while on airband. Or toggle off "snap".

#airspyr2

My first assumption would be to check all my assumptions. The very first would be that the signal is actually being broadcast at the frequency that you think it should be. The only information I can p

#airspyr2

… or did you try a firmware update? It was shipped with the latest firmware. ---------Airspy.US Your USA source for quality SDR products! www.Airspy.US NOTE: This email address is NOT MONITORED. If yo

#airspyr2

It should be calibrated then. Can you post a full screenshot including settings? The one you posted shows very little. Did you try to recalibrate it after receipt? ---------Airspy.US Your USA source f

#airspyr2

I did purchase it from the AirSpy US store

#airspyr2

https://i.imgur.com/2FL7Mop.png The transmission shows up a different frequency then the actual tx frequency.

#airspyr2

Unless you purchased it from us because we calibrate them prior to shipment. ---------Airspy.US Your USA source for quality SDR products! www.Airspy.US NOTE: This email address is NOT MONITORED. If yo

#airspyr2

What do you mean with "isn't aligned with"? How much is it off at which frequency? As a first step you could calibrate your R2 with AirspyCalibrate.exe.

#airspyr2