jks

The DRM mistuning detection is extremely good. Screenshot below is Radio Marti, received in PA, mistuned by +1 kHz (!) It locks and decodes fine. It also probably helps that they are running a very conservative configuration.

The DRM spec has a little more information about the frequency pilot cells, section 8.4.2, page 121, http://kiwisdr.com/files/DRM/DRM.spec.v4.1.2.pdf

"/?ext=drm" since DRM is both a mode and an extension. Use e.g. "drm,3965" to select one of the preset frequencies.

I can't remember why DRM can't be used as a mode selection in the URL. Some problem that was too difficult to fix no doubt.

When the aluminum enclosure was being developed I specifically asked Seeed to use a ball bearing fan (i.e. sleeveless). But I'm pretty sure now they didn't given the observed failure rates. I should ask again. Note that we receive no royalty on enclosure sales in an effort to keep the cost low. It's all Seeed's deal.

Alternative fans and ideas are mentioned in these posts:
http://forum.kiwisdr.com/discussion/comment/8667#Comment_8667
http://forum.kiwisdr.com/discussion/comment/7102

A simplistic but useful way of thinking about this issue is this: Suppose the waterfall is slowed to draw one line every ten minutes. During those ten minutes it could be sampling at ~21 Hz (full rate) and integrating those samples so the coherent QRSS signal is gaining a huge SNR advantage over the random noise. But the waterfall doesn't do that currently. It would just sit idle for ten minutes then take one sample.

The integrate extension does a little better. It does integrate every time its waterfall output wraps around top-to-bottom. If the integration period (time to draw everything top-to-bottom) is short (e.g. 1 sec for time stations) then this is useful. But it isn't designed to work any better with long periods. So it's no good for QRSS signals.

On the wish-list for a long time is a high-resolution FFT extension. One that could for example be used to resolve the millihertz differences of AM BCB stations (a technique already used very effectively by AM BCB DX'ers). Such an extension would naturally do long-period averaging in addition to high frequency resolution.

Your IQ balance is almost certainly off as a result of pushing the "IQ bal" button in the IQ display extension when not tuned to a quiet part of the spectrum (or having the antenna disconnected). There is a topic explaining all this: http://forum.kiwisdr.com/discussion/699/why-a-beat-in-am-incorrect-iq-offset/p1

Easiest way to confirm this is to check the beginning messages in the log tab on the admin page. You should see numbers for the I and Q balance that are either the default (-0.02) or roughly the same. Example:

Thu Jun 18 15:46:49 00:00:32.361 ....      using DC_offsets: I -0.020000 Q -0.020000