SGP/SONDE/B4 - Soundings contaminated by interference

These five soundings, done in succession on 11/07/2002 as part of the SCM/IOP are 
contaminated by interference.  I can't tell whether the problem has to do with improper tuning of 
the radiosondes, inadequate frequency separation among radiosondes launched from 
different locations, or some other operator problem.  I suspect that there is an operator 
component to the difficulty because the surface pressure is given as an unreasonably low 896.6 
hPa on the 1730 sounding and 886.1 hPa on the 2331 sounding.  This may indicate that the 
ground station was locked another station's radiosonde rather than on the B4 radiosonde.

Not much to be done about the data.  I will send an e-mail
to SiteOps alerting them to the problem.  I note that the more recent
soundings that I have from B4 (11/08/2002, 0829,1156,1429,1729) look
OK, though the fact that the 0230 and 0530 soundings are missing and
the 1156 sounding was done almost a half hour late suggests a continuing
problem.

• Dewpoint Temperature(dp)
• Ascent rate(asc)
• North Latitude(lat)
• Wind Speed(wspd)
• -180.0 - +180.0(alt)
• Dry Bulb Temperature(tdry)
• Easterly Wind Component(u_wind)
• V wind component(v_wind)
• Retrieved pressure profile(pres)
• Wind Direction(deg)
• lon(lon)
• Relative Humidity (hybrid-b grid)(rh)

• Relative Humidity (hybrid-b grid)(rh)
• -180.0 - +180.0(alt)
• North Latitude(lat)
• lon(lon)
• Retrieved pressure profile(pres)
• Dry Bulb Temperature(tdry)

• Integrated vapor column from sonde using MWR Instrument Performance Model (IPM)(integ_vap_sonde)
• MWR IPM output for 23.8 GHz sky brightness temperature using sonde T,P,RH(model_tbsky23)
• MWR IPM output for atmospheric mean radiating temp using sonde T,P,RH(model_tmr31)
• MWR IPM output for 31.4 GHz sky brightness temperature using sonde T,P,RH(model_tbsky31)
• maximum height attained by the balloon in pressure units(max_height_sonde)
• MWR IPM output for atmospheric mean radiating temp using sonde T,P,RH(model_tmr23)

• Dry Bulb Temperature(tdry)
• Retrieved pressure profile(pres)
• Relative Humidity (hybrid-b grid)(rh)
• lon(lon)
• Wind Direction(deg)
• Easterly Wind Component(u_wind)
• Ascent rate(asc)
• -180.0 - +180.0(alt)
• Dewpoint Temperature(dp)
• V wind component(v_wind)
• North Latitude(lat)
• Wind Speed(wspd)