Tvheadend

Hi there, tvheadend novice here.

The background for my setup is:

• Country: UK
• System: Raspberry pi running raspbmc 3.10.24
• DVB input: PCTV 460e DVB-S2 USB stick (external power source, not using usb hub)
• Satellite: Astra 28.2 - confirmed working when using using bundled PCTV software on a separate Windows box

I'm borrowing one of the two LNB feeds going into my usual PVR box, to try out some HTS.
I've installed tvheadend, and can see the UI on port 9981. (Process is running as user "pi", who is in the video group.)

The adapter is correctly listed under Configuration -> DVB Inputs -> TV Adapters (name "NXP TDA10071")

I've setup a single Satellite config using Port 0, with LNB type "Standard".
(The PVR box claims the LNB type is Standard, and the PCTV bundled software claims the port is "DiSEqC A | 1", which I assume means port 0 for tvheadend satconf.)

I've added the muxes using "Add DVB by Network location...", choosing Astra_28_2E, which gives me 88 muxes.

However, during the initial scans, no services are detected; every attempted initial scan gives errors like:

Feb 18 22:56:23.002 dvb: diseqc setup failed -1
Feb 18 22:56:23.002 dvb: "/dev/dvb/adapter0" tuning via s2api to "12,596,000 kHz Vertical (Initial)" (2596000, 27500000 Baud, 2/3, SYS_DVBS, QPSK) for Initial autoscan
Feb 18 22:56:23.004 dvb: "/dev/dvb/adapter0" tuning to "12,596,000 kHz Vertical (Initial)" -- Front configuration failed -- Invalid argument, frequency: 2596000

Any pointers you can offer me on how to fix this are much appreciated.

~granted