USRP+RFX1200 on air
A. Maitland Bottoms
aa4hs at amrad.org
Sat Feb 17 22:36:58 CST 2007
I have brought up and received the Alexandria 1282.600-
repeater from my house using Gnu Radio software,
the Universal Software Radio Peripheral (USRP), with
a RFX1200 Transceiver Daughterboard. 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 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.
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 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,
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