In Six News No. 66, Emil Pocock,
W3EP contributed a fascinating article on ionospheric scatter. No doubt scatter
accounted for my surprise contact with ZW0F early one morning during the last
cycle when my antenna was pointing in quite the wrong direction . My first
encounter with scatter, however, occurred as early as 1947, and on 28 MHz, not
Heightman, G6DH with XYL Eileen.
For some years following the
end of WWII, things were hard to come by and very expensive. I was living in
south east London at the time, and my radio equipment was very primitive and all
home-brew. By way of an antenna I had just a length of wire tied to a convenient
tree. Ten metres was the ‘magic band’ in those days, and I was well aware of
its potential because in 1937, as a SWL I caught the end of the previous sunspot
cycle and heard a lot of USA stations at (to me) ‘phenomenal’ signal
strengths on my three valve receiver.
In January 1946 we were close
to the peak of Cycle 18, so before leaving for work each morning, I would check
28 MHz, hoping that it might open early to the east. On several such occasions I
heard Denis Heightman, G6DH, in Clacton, Essex, at exceptionally high signal
strengths. Eventually I dropped him a card, and in a day or so he sent a reply,
writing on the back of his card:
"I am investigating the
reason for hearing these short-distance signals. It appears that they go out at
a low angle, say for about 1500 miles, and are reflected by the ionosphere
almost at normal incidence, back to where they came from. The only requirement
is that both TX and RX beams point in the same direction and that there is
sufficient daylight (ionisation) in that direction. In the mornings it is to the
east, but at 1400 one can point the beams anywhere from east to north-west and
get reflections". There is little doubt that G6DH, whose main interest was
the radio spectrum above 28 MHz, was experiencing ionospheric backscatter at
In 1946 UK amateurs had an
allocation at 56 MHz, but in other parts of the world operation was permitted on
50 MHz. G6DH, who was a professional radio engineer, built a very nice receiver
for 50 MHz and also had a small beam antenna for the band. On November 24th
1946, just before noon, he began hearing 50 MHz signals from the USA. Replying
on 28 MHz, he is reported to have startled the household by shouting "I am
hearing you on 50 Megacycles" into the microphone to Ed Tilton, W1HDQ the
station at the far end.
During the year which followed,
the RSGB urged the licensing authority to consider granting G6DH special
permission to transmit on six metres. Meanwhile he carried out the necessary
modifications to his 56 MHz transmitter.
The QSL card of 50MHz pioneer
A special licence was issued on
November 5th 1947. That same day G6DH completed the first six metre two-way
transatlantic contact, Ed W1HDQ again being the station at the USA end. Signals
were S9+ in Clacton and S7 in Connecticut. Two days later G6DH worked MD5KW in
the Suez Canal Zone, the station of none other than Major Ken Ellis, G5KW Royal
Signals, who later became a founder member of the UK Six Metre Group. Ken I have
known for many years, but it was quite by chance, some thirty years after these
events, that I ran into W1HDQ, still a very active 50 MHz operator, in a radio
store in Hartford, Connecticut.
A QSL card received by 2CIX (aka
G8VR) on 'Approximately Six Metres'!
Ten years before this, in 1937,
I was using a super-regen receiver on or about 56 MHz (see "Approximately
Six Metres", Six News No. 40) which put out so much hash that it would have
served quite well as a transmitter! I held the artificial aerial call 2CIX at
the time, so I could listen but not transmit. The first DX I copied was G8CS
sending MCW with his 25-watt self-excited two-valve push-pull transmitter from
his location at least two miles distant.
Happy days, a far cry from the
400-plus watts and 7 element arrays of today, but it was great fun.
UKSMG Six News