This is a little list of all USRP daughterboards I could find, with their corresponding
supported frequency operating range. Not all of this information is on the same page on
the Ettus website, and I find it handy to be able to refer to this as they pop up on
ebay. The Ettus website 'hides' the information on the obsolete boards they don't sell
anymore.

The 'range with offs' is the receive range when mixed in with a signal up to 1GHz.
I included this because I have a frequency generator I use to extend the (receive)
range of my boards, which allows me to tune up to 1GHz below or above the designed
bands. The capabilities column is also written with the assumption you can mix in a
1GHz signal.

(The 'owned' column is just a reminder to myself of what boards I have laying around.)

==========================================================================================================================================
| Ettus USRP daughterboards
==========================================================================================================================================
board       | owned? | orig range               | range with offs    | RX/TX | Bands/capabilities per band (assuming 1GHz osc)
------------+--------+--------------------------+--------------------+-------+------------------------------------------------------------
DBSRX2      | Y      | 800.00 MHz -    2.30 GHz |   0 GHz - 3.30 GHz | RX    | HF, VHF, UHF, L-band, S-band (Partial)
LFRX+LFTX   | Y      |   0.00 MHz -   30.00 MHz |   0 GHz - 1.03 GHz | RXTX  | HF (RXTX), UHF(RX), VHF(RX)
WBX         | N      |  50.00 MHz -    2.20 GHz |   0 GHz - 3.20 GHz | RXTX  | HF (RX), VHF (RXTX), UHF(RXTX), L-Band(RXTX), S-Band (RX)
SBX         | N      | 400.00 MHz -    4.40 GHz |   0 GHz - 5.40 GHz | RXTX  | HF (RX), VHF (RX), UHF(RXTX), L-Band(RXTX), S-Band (RXTX), C-Band (Partial RX)
CBX         | N      |   1.20 GHz -    6.00 GHz | 200 MHz - 7.00 GHz | RXTX  | L-Band (Partial RXTX), S-Band (RXTX), C-Band (Partial RXTX/RX)
UBX         | N      |  10.00 MHz -    6.00 GHz |   0 GHz - 7.00 GHz | RXTX  | HF (RX), VHF (RXTX), UHF(RXTX), L-Band (RXTX), S-band (RXTX), C-Band (Partial RXTX/RX)
TwinRX      | N      |  10.00 MHz -    6.00 GHz |   0 GHz - 7.00 GHz | RX    | HF, VHF, UHF, L-Band, S-Band, C-Band (Partial)
RFX400      | N      | 400.00 MHz -  500.00 MHz |   0 GHz - 1.50 GHz | RXTX  | HF (RX),
RFX900      | N      | 750.00 MHz - 1050.00 MHz |   0 GHz - 2.05 GHz | RXTX  | UHF (RXTX), L-Band(RX)
RFX1200     | N      |   1.15 GHz -    1.45 GHz | 150 MHz - 2.45 GHz | RXTX  | VHF (RX), UHF (RX), L-Band (RXTX), S-Band (RX)
RFX1800     | N      |   1.50 GHz -    2.10 GHz | 500 MHz - 3.10 GHz | RXTX  | UHF (RX), L-Band (RXTX), S-Band(Partial RXTX/RX)
RFX2400     | N      |   2.30 GHz -    2.90 GHz | 1.3 GHz - 3.90 GHz | RXTX  | L-Band (RX), S-Band (Partial RXTX/RX)
XCVR2450    | Y      |   2.40 GHz -    2.50 GHz | 1.4 GHz - 3.50 GHz | RXTX  | S-Band (Partial RXTX/RX)
           |        |   4.90 GHz -    5.90 GHz | 3.9 GHz - 6.90 GHz | RXTX  | C-Band (Partial RXTX/RX)
BasicRX/TX  | N      |   1.00 MHz -  250.00 MHz |   0 GHz - 1.25 GHz | RXTX  | HF (RXTX), VHF (RXTX), UHF (RX), L-Band (Partial RX)
TVRX2       | N      |  50.00 MHz -  860.00 MHz |   0 GHz - 1.86 GHz | RX    | HF, VHF, UHF, L-Band (Partial)

Also, as a reminder:

=========================================================================
| Band definitions                                                      |
=========================================================================
| Band    | Frequency range                                             |
+---------+-------------------------------------------------------------+
| L-Band  |  1.0 GHz -  2.0 GHz                                         |
| S-Band  |  2.0 GHz -  4.0 GHz (Most satcom sits in 2.2 GHz - 2.3 GHz) |
| C-Band  |  4.0 GHz -  8.0 GHz (Most satcom sits in 3.6 GHz - 4.2 GHz) |
| X-Band  |  8.0 GHz - 12.0 GHz                                         |
| Ku-Band | 11.0 GHz - 20.0 GHz                                         |
| K-Band  | 18.0 GHz - 27.0 GHz                                         |
| Ka-Band | 27.0 GHz - 40.0 GHz                                         |
=========================================================================

References:

* (non-obsolete boards) https://www.ettus.com/product-categories/rf-daughterboards/
* (obsolete boards) https://kb.ettus.com/Category:Legacy_Products

Some observations on the LFRX+LFTX boards:

   These boards are a little different from the other ones I have. Unlike the
   DBSRX2 and the XCVR2450, it tends to be more finnicky to tune these in GQRX.
   They don't have hardware tuners, instead the tunning is, in
   theory, supposed to happen in software, but ehhhhh... I've had more luck
   with just setting my sample rate + bandwidth to 28M and just slurping in
   the entire HF spectrum instead. OR do the opposite and set the sample
   rate and bandwidth to something really narrow (then the software tuning
   will work correctly). It just doesn't like being in the middle I guess.

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