The first UK QSO on the 122 GHz band
took place yesterday the 17th of July at 13:45
hours UTC between Roger G8CUB/P and Chris G0FDZ/P with
both stations located at Hackpen, Wiltshire (IO91CL).
The distance was 120m and the CW reports were 599 both
ways. An earlier attempt at 5km failed for a two way QSO.
As well as signals on 134 GHz, of which only a very weak
one way QSO was possible on that band, only the merest
hint of a signal on 122 GHz was heard. The 122 GHz band is
noted for its high signal attenuation due additionally to
atmospheric oxygen as well as water vapour attenuation.
The weather during the contest gave high humidity, and
absorption of all millimetre wave frequencies was
considered by many to be high. Although signals over the
short distance were very good an attempt will be made soon
over 1.5kms. Power levels were 70uW for Chris G0FDZ &
300uW for Roger G8CUB. One feature of G0FDZ’s system was
the use of a slab type mixer which has been recently
developed to make millimetre wave mixers easier to
With a QSO being achieved on this band
it means that every allocated UK band has now has had at
least one QSO.
A full report on the QSO and progress
will appear in the UK Microwave Groups Scatterpoint
newsletter, and photos and video will be available soon.