My rig at present is a new Yaesu FT 991A. This radio has plenty to get my head around but I am enjoying the challenge.The Main antenna is my end fed 17.78 meter
(Magic Length) wire
The installation is part stealth coming out of my house loft area by going through the wall and turning at right angles down my garden path. The end fed wire is connected to a 9-1 Unun and fed directly into my SG239 Smart Tuner in the loft away from any weather conditions.
The SG239 smart tuner really works well and I can do all bands
from 1.8 - 3.5 and up to 10 + 6 Mtrs. The end fed has 4 counterpoise wires at various lengths.(two of which are very long one being ground surface.) With both antennas I do not require the built in tuner from the FT991A so I keep this tuner switched to external. The end fed is approximately 5 meters high when coming out of the top of the house and sloping to 3 meters at the far end where I have a wooden pole.
My optional antenna is my MFJ Horizontal loop Hi Q approx 98cm. diameter. The loop has a remote control tuner which after a little experience to tune it becomes a great antenna exceeding all expectations. As the loop is 9 meters of the ground (30feet) MFJ recommend the loop be horizontal and a plus with that is it becomes Omni directional!
The many memory settings of the SG239 smart tuner make matching easy and SWR is low.
I can switch from end fed wire to Magnetic loop with my HF ‘switch over’ in my shack and the end fed wire becomes my ears while I scout the bands before tuning the Mag. loop to the desired frequency.
The mag. loop is placed on the wall gable end of the house and a steel pole takes it above ridge height to 9 Mtrs. 30 foot.
(See Picture above)
The installation throuh the wall of my end fed wire (is by means of a small 6 mm hole and using plastic 6mm heating pipe) threading the wire through the tube. The wire length inside the lost area is kept to a minimum. Mine is less then 3 meters in length from the SG239 smart tuner, before it goes through the wall, turning at 35 degrees as it follows the garden path to a wooden pole.
Chris Denton-Powell is one of the grandsons of
Joseph John Denton. A.I.M.E.E.
1880 -1952 Telephone-Televisor-Hertz Waves and Radar
J.John Denton with Benn Clapp 1920s
J.J.Denton with Benn Clapp 1930s
My Grandfather was the inspiration of my radio activities
as he was one of the pioneers in the development of radio and televisor later to be called television.
Professor J.J. Denton.
(It was published at the time that JJ Denton was undertaking secret radio research for the Government, but finding out exactly what Government work he was doing and in locating Denton's radio call sign for 1923-4 has been difficult to find but we have found DXV which could well have been changed to 2DXV in 1940 Other possibilities found are 2TW Baird Experimental Harrow and 2TV both from the area he was working and residing. If anyone has any ideas on how I could Substantiate one of these call signs I would really be interested to know, (at present time I am in contact with Ofcom as RSGB failed to reply and maybe we would finally find his call sign.)
J J Denton worked with the Hasting municipal Corporation and was the first Honorary Secretary of the Hastings Radio Society 1920s
Below is just some information on my grandad J.J Denton in 1920s and http://www.bairdtelevision.com/radar.html
As well as considering radio waves as a source of illumination for televised objects, JLB was using radio waves to carry television signals. He is reported to have been transmitting images along the south coast in April 1924 [5,6], but the a question arises of where Baird got the transmitter from. On the balance of evidence it is considered that the transmitter was provided by J.J.Denton, a part-time physics lecturer and close friend, whose wife ran a boarding house in Hastings. Antony Kamm has kindly provided the authors with a copy of a letter written to the BBC in 1950 from a
Mr Pamment, who in 1923 stayed at the Denton boarding house. Denton had asked Pamment to go with him to his laboratory in London and see television images being sent and received at his laboratory but Pamment never took up the invitation. It was published at the time that Denton was undertaking secret radio research for the Government, but the writers are having problems in finding out exactly what Government work he was doing and in locating
Denton's radio call sign for 1923-4 (believed to be 2DXV)
2 Grove Park
Liverpool
20th June 1900
Dear Sir,
I am afraid you have under taken a very difficult task if you are going to have a number of unskilled observers scattered amongst the Surrey hills trying to detect hertz waves. They will each require a portable apparatus and if they intend to work with telegraphic instruments then they will require a good deal of design adjustment and of practice on of practice on behalf of the observer. But the easiest plan for them would be to use telephones, a small one cell portable battery a Coherer either a single point coherer or a filings tube and a telephone in circuit with both, preferably, of course with a pair of earphones strapped around the head, the only other option is a collector and this collector may be a wired stick held in the hand like a walking stick raised in the air; the other terminal being the metal sole of a boot or a spike running into damp ground.
The sender I suppose will be at a fixed station with a large induction coil, a good earth and a wire elevated as high as possible away from all surrounding buildings and trees.
With these arrangements and a week’s practice would expect fair results might be obtained, but if the practice is limited to one day nothing can be done with any prospect of success.
Yours faithfully
Oliver J Lodge.
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There is more to view and a few more videos on the Main web site if you have a Desktop or lap top computer you would view more easily.
FAMILY HISTORY
G0MRR