USRP+RFX1200 on air

[A. Maitland Bottoms]

OK,

I have brought up and received the Alexandria 1282.600-
repeater[1] from my house using Gnu Radio[2] software,
the Universal Software Radio Peripheral (USRP), with
a RFX1200 Transceiver Daughterboard.[3] Hopefully soon
I'll catch someone around for a first QSO via software.
(I had a QSO with WD5DBC's ID-1 earlier... so there is
activity on the band around here.) The antenna is a
Diamond RH951S[4] HT Antenna.

Since it has been a couple of years since I got the USRP,
my new transceiver didn't have the right setup to work
without some hardware and firmware tweaking.[5]

Big thanks to N4TPY for the workbench and WB5MMB for some
expert surface mount soldering.

To work the repeater, I did have to edit the Python application
usrp_nbfm_ptt.py[6] to use a -12 MHz transmit offset. This is the
first time I've adjusted a radio's duplex mode using Emacs :)

73 de aa4hs,
-Maitland

URLs:
[1] http://w4hfh.org/
[2] http://gnuradio.org/trac/wiki
[3] http://www.ettus.com/
[4] http://www.rfparts.com/diamond/rh951s.html
[5] http://lists.gnu.org/archive/html/discuss-gnuradio/2007-02/msg00111.html
[6] http://gnuradio.org/trac/browser/gnuradio/trunk/gnuradio-examples/python/usrp/usrp_nbfm_ptt.py