[dspsr-users] problems with dspsr on 1-pol DFB search mode data

[Marta B. <bu...@oa...>]

Dear all,

it looks like the most recent version of dspsr fails to fold search mode 
data recorded with the DFB (at both Parkes and the Sardinia Radio 
Telescope) with 1 polarization.

In attachment you can see an example of what happens folding the same data 
file with the same set of ephemeris with an old version of dspsr 
(installed through PSRsoft, I believe, in 2015) and with the newest 
version.

I did a few tests with SRT data (1-pol 1-bit, 1-pol 2-bits) and PKS data 
(1-pol 1-bit, 4-pol 8-bits) taken in search mode wih the DFB. The latest 
dspsr works fine only on the latter (even though the results are still a 
little better with the old dspsr [pdmp SNR 16 vs 15; first channel 
saturated with the new dspsr]).

I tried both with polyco and predictor and using an ephemeris file or 
giving P and DM directly. Nothing changes.

I'm not sure whether the problem is directly related to dspsr or if it 
depends on psrchive. For SRT data, in fact, I used to install the 
development version of psrchive, before installing dspsr. This solved an 
issue (a warning about an itoa_code not found) that now, with the 
currently available versions of psrchive and dspsr, is back.

Is anyone else having the same problem? Any idea of what can be going on?

Thanks!

 	Marta

---------------------   (> *  ---------------------
Marta Burgay c/o
INAF - Osservatorio Astronomico di Cagliari
via della Scienza 5
09047 Selargius (CA)
Italy
tel +39 070 71180 249
fax +39 070 71180 222
---------------------------------------------------