Yes, can confirm Steve's comment, with -t that's the expected result.

I also get the "PLL not locked!" error message on my RTL-SDR (different PID), but flowgraphs still work fine in GNURadio / Win10.

On Mon, Oct 29, 2018 at 5:29 PM Steve Markgraf <steve@steve-m.de> wrote:

Hi,

On 28.10.2018 16:26, MB wrote:
> Is it possible RTL_TEST is looking for a E4000 because of it's dongle's
> screwy PID, even though it sees a R820T. If not, why is it not working?
> thanks.

» rtl_test -h
rtl_test, a benchmark tool for RTL2832 based DVB-T receivers

Usage:
[-s samplerate (default: 2048000 Hz)]
[-d device_index (default: 0)]
[-t enable Elonics E4000 tuner benchmark]

As you can see, -t only works with E4000 tuners, and is meant to
determine the size of the L-Band gap this tuner has. The R820T2
you have doesn't have an L-Band gap, thus there is nothing to benchmark.

Regards,
Steve