Returning to WSPR after long break, but no spots reported.

Today just cranked up my simple home-built 40M WSPR Tx running 23dB into half-size G5RV, but so far no takers after over one hour at 100% duty cycle.
wsprnet.org identifying nearly two hundred spots during the same period and the band looks to be very active. So I can only assume that I have issue(s) with my Tx and/or antenna.
Anyway, if someone does hear me then please send me an email to: m0roj@goldford.co.uk
73