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  QSL image for G7HZZ

G7HZZ England flag England

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Member of the Phoenix Radio Group and Youth Hostels Radio Group

 

G7HZZ

Also operating as GW7HZZ and GM7HZZ

IO92KU - WAB SK53

 

 

About Me

 

My Amateur Radio interests are portable and mobile operations, building portable antennas and meeting interesting people on the air.

I grew up with 'wireless' and shortwave receivers and, as a 'kid', I had many aerial wires all over my bedroom. Amateur Radio came along much later. I am also keenly interested in photography, history and the environment.

My 'old' 1996 Land Rover Discovery is my most important piece of equipment: it takes me to some very interesting photographic and radio locations. Most of my radio operating is mobile from the Land Rover, or portable using fishing pole antennas on the back of the Land Rover.

My home territory is near the so-called "Robin Hood City" of Nottingham in the centre of England. In the summer I travel widely around the UK, especially in Wales (IO72XC, WAB SN74), and in the Lake District (IO84LK, WAB NY20). I participate in "Worked All Britain' (Book No. 19818) but do not actively seek squares myself

I also travel widely in and Europe, usually from a base in West Vlaanderen, Belgium (JO10TS), and especially to southern Germany, Austria (Tirol) and northern Italy (Dolomiti). I mostly use Youth Hostels in Europe

 

I am happy to receive and send QSL cards via the bureau. When I am working as GW7HZZ and GM7HZZ, and for non-UK operations, cards should be sent to my normal callsign (G7HZZ).

I am the founding member of Phoenix Radio Group M0PHX which is a 'laid-back' group of 'fossils' who like to operate portable stations for fun, also the Youth Hostels Amateur Radio Group - M0YHA

73 and thanks for visiting.

Alan

 

 

Antenna Experiments

 

Off-Centre Fed Dipole for 80m to 6m

Updated 30 December 2013:

Based on a Carolina Windom off-centre fed dipole, with a third short (3.9m) length of wire, parallel with the longer element, for 17m operation.

It is now fed with RG58 into a 200W G Whip 4:1 balun at the feedpoint. I have used clip on ferrites to control common mode currents (feedback) because they do not add any inductance/loading that occurs when air-core choke coils are used.

The antenna SWR is less than 3:1 on 40, 20, 17, 15, 12, 10 and 6m bands. The SWR is 8:1 on the 80m band. This means that the antenna was easily 'tuned (ie matched) with my a new LDG AT-897Plus automatic ATU (and an Yaesu FC-30 ATU) - except for 80m where I need to use a Tokyo Hi Power HG-400L.

 

Construction is using nylon cable ties and 18mm waterpipe as spacers. The water pipe is drilled through to take the antenna wire which is held in place inside the pipe with a cable tie which permits a degree of slip and slide for adjustment of the spacer's.

The separation between the long element and the 17m section needs to be at least 150mm to manage the interaction between the two elements. An antenna analyser is indispensible for setting up.

Performance: initially, there was some residual RF feedback which was cured with a 'clump' of eight ferrites at 3m below the balun and several other clumps of two or three along the RG8 <> RG213 feedline. On-air tests show this has fully cured the problem. An air core choke was found to affect the tuning on some bands and it was therefore removed.

Testing: The antenna has been used regularly with very good results. Overall it seems 'well-behaved' with no particular issues or problems.

Thanks to Andy M0FOS for his advice on this project.

 

OCFD Antenna Mk II

The 3-leg OCFD above has now been copied for use as a portable antenna. Performance is almost identical, so there are no surprises there. This shows (at least) that the design is pretty 'solid' and reproducible.

Equipment

 

Base
Icom IC-735 + AH2 Smart Tuner or
Tokyo Hi Power HG-400L + RM-400 SS RF amp + Datong FL3
Kenwood R-5000 - communications receiver.



Portable
FT-897D
+ LDG AT-897 Plus ATU or SG231 Smart Coupler.

Mobile
FT-857D + ATAS-120A 'Screwdriver' and various mobile whips via a Yaesu FC-30 ATU.

 

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Last modified: 2013-12-29 16:31:08, 12117 bytes

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