Inconsistency with Bluetooth scanning / looking for a recommendation for a Bluetooth USB adapter for Linux.

[Rafi Gordon]

Hello,
  I bought a Dynamode bluetooth USB adapter in Ivory. It is Ultra
Compact Dynamode
  bluetooth 2.0 adapter (it is the only one Ivory have). I inserted it into
  a Fedora 11 x86_64 machine.

  lsusb recognizes it as:
  ...
  (Bus 002 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd
Bluetooth Dongle (HCI mode)
  ...

  Now, I tried several times to scan with this device (by "hcitool
scan"). There was a Samsung galaxy android  device  about 2 meters
from it (it's bluetooth setting were on) and some more bluetooth
devices in the area (some in 10-15 meters radius,  and some 2-3 meters
right above, in the higher floor). The results were that
  sometimes scan found the Samsung galaxy device and usually one other device,
  and sometimes it did not find the samsung galaxy device, even that
it is really near (2 meters from the Bluetooth UDB adapter, as said).

  The other device that it found was different each time. When I tried
to perform
  bluetooth scanning ***with the Samsung galaxy device***, I
**always** found **all** the devices,
  including those on the floor above.
  I assume that maybe this Dynamode bluetooth USB adapter is not so
  efficient and not of so high quality (event though it is said to
find bluetooth
  devices in the radius of 100 m).

  So I would like to get ideas for why there is this inconsistency in
  scanning or alternatively a recommendation for a better
  bluetooth USB adapter for Linux.

  Following are the results of hciconfig -a:

  hciconfig -a
hci0:	Type: USB
	BD Address: 00:1F:81:00:02:50 ACL MTU: 1021:4 SCO MTU: 180:1
	UP RUNNING PSCAN
	RX bytes:2845 acl:0 sco:0 events:77 errors:0
	TX bytes:528 acl:0 sco:0 commands:49 errors:2
	Features: 0xff 0x3e 0x0d 0x76 0x80 0x01 0x00 0x80
	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
	Link policy: RSWITCH HOLD SNIFF PARK
	Link mode: SLAVE ACCEPT
	Name: 'apolo-0'
	Class: 0x4a0104
	Service Classes: Networking, Capturing, Telephony
	Device Class: Computer, Desktop workstation
	HCI Ver: 2.0 (0x3) HCI Rev: 0x3 LMP Ver: 2.0 (0x3) LMP Subver: 0x3
	Manufacturer: Cambridge Silicon Radio (10)
Regards,
RG