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G3NGD England flag England

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The Photograph above shows G3NGD operating his Amateur Radio Station in the year 1960. The Receiver (top left) is a Marconi CR100. The equipment in the steel rack (Right hand side) was all home constructed. The Transmitter (Middle right) operated on the 160, 80, 40, 20, 15 and 10 metre bands AM and used an 807 Power Amplifier Valve. The power output was approx. 60 watts. The Transmitter below operated on both 160 and 80 Metres. The Power Amplifier Valve was a TT11 giving an output power of approx. 8 watts. At that time, there was a maximum input power limit of 10 watts on the 160 Metre band.

John obtained his Amateur Radio Licence in 1958. At that time, most Amateur Radio Equipment was either 'home built' or modified ex-army/ex-WD. John built his own equipment for many years then purchased a KW204 Transmitter in the 'seventies' and a Drake R-4C receiver. In November 2008, John sold his KW and Drake equipment and decided to purchase a Yaesu FT-450.

As John is an 'Old-timer', he still uses his home built equipment (Tx and Rx) on Top Band, which is fully solid state.

                                                  It is shown below: Rx LHS; TX Centre; Speech Proc and Eagle DD3 Microphone RHS. The TX has a Maximum Output of 6.25Watts (7.9dBW).

           Having purchased the Yaesu FT-450, John decided to build a Trapped Dipole for the 17, 12 and 6 Metre bands.

Having made many contacts around the World using the Tri-Band Trapped Dipole (18MHz, 24MHz and 50MHz), John decided to add extra Traps in order to include 14MHz, 21MHz and 28MHz. The Aerial now covering the 14MHz - 52MHz Amateur Radio Bands is shown below. SSB contacts made on the 14MHz Band on the first day of testing included: KH6 (Hawaii); AH6 (Honolulu) and W7 (Washington, USA).

The farthest distance contacted on 50MHz was with ZS6CCY (on SSB) which is a distance of 5692 miles from my QTH.


Photograph of Trapped Dipole is shown above and dimensions shown below.

                                                                                      If you would like to design your own TRAPS using Double-sided PCB, then click this link to my Website.


John (Sitting Centre) with his successful Students of the 1982 RAE Class.

John taught the RAE at North Trafford College, Stretford, Manchester for twenty-three years. He also held Radio construction classes for Radio Amateurs. John wrote a large amount of Computer software which was published in various Amateur Radio Magazines and Practical Television. 

In order to Teach the Radio Amateurs' Course to the full, John applied for the Callsign G4FXP and built a dedicated Shack at the College. The photograph below shows John operating the College Radio Station with Students looking on.


In 1976, John built a Semi-vertical Aerial for Top Band, Eighty and Forty Metres. His garden is only 50ft (15·24m) long x 28ft (8·53m) wide. This Aerial is still used for the 160, 80, 40 bands. In January 2015, John constructed another 'Trap' (resonated on 5·373MHz) and inserted it between the 3·7MHz and 7·15MHz Traps to allow operation on the 60 Metre Band.

John wrote an Article detailing this antenna in RADCOM, August 1976 and there was a reprint in CQ Magazine Januuary, 1977. A photograph of the current version is shown below.

The photograph below is that of the G3NGD Semi-Vertical Aerial designed for operation on the 160 Metre, 80 Metre, 60 Metre, 40 Metre and 30 Metre Amateur Bands. The 30 Metre Band (10·100 - 10·150MHz) works well, as the vertical length of the 2" diameter Alloy Tube is almost a quarter wavelength at 10MHz; the measured SWR being 1·2:1 at 10MHz. The Alloy Tube being 2" diameter makes the RF Signal think it is a resonant length at 10MHz and so ignores the smaller horizontal wire to the 7MHz Trap.

A pulley fixed from the top Mast Hook on the Vertical is used to suspend one end of the G3NGD Six-Band Trapped Dipole 14MHz - 52MHz. Originally, the pulley was fixed to the top of the Vertical, but it was found better to space the two aerials some distance apart to prevent capacitive loading when using Topband and Eighty Metres. [The Semi-Vertical is a permanent installation; the Trapped Dipole is only fitted when required].


                                                            The photograph above shows the position of the Traps.


Overall Plan of the G3NGD Semi-Vertical Antenna is shown above.

If you would like to see the Full Description, click this Link.


The Photograph above shows my Portable 50MHz Dipole using the 'Armstrong Method of rotation'. It is used when I work Canada and the USA on 50MHz as my Fixed Six Band Trapped Dipole runs East - West and so radiates North and South. It is made from an old (Band 1) VHF Television Aerial (cut to resonant length) supported by a Garden Table as shown. A (50W) 1:1 Balun is fitted at the feed-point, the coaxial cable used being RG58/U Mil. The supporting pole is PVC Tubing allowing the Dipole to be rotated Vertically to provide Vertical polarisation if required.

This was G3NGD/M installed in a Ford Van for Top Band and 70MHz in 1965.

The Top Band Transmitter Top Left was designed and built using Valves by G3NGD. The Transceiver converted for 70MHz by G3NGD was an Ex-Tank Model B44. G3NGD designed and built a Transistorized Power Supply (like a SMPS used today) to provide 250V d.c. for the Valves. This was built on the 'Royer Oscillator Principle' using Type OC35 Transistors. 12V d.c. from the car battery was converted to 250V d.c. The oscillator frequency was approx. 2KHz which is more easier to smooth than 50Hz.  The Transformer windings were wound on an HCR Laminated Core (not like Ferrite today) and the unit was housed under to bonnet of the Van.

This is the underside of the G3NGD Top Band Transmitter.


   Base loaded Aerial for Top band                             4 Metre Beam for 70MHz used when 'Static Mobile' only.



G3NGD supports the DX Code of Conduct.


7960983 Last modified: 2017-03-12 09:49:55, 10607 bytes

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QRZ Logbook Summary for - G3NGD
Latest Contacts for G3NGD at QRZ.com
dedateband mode grid Country op
CT2IUK 2016-05-10 40m SSB IM59kj Portugal Anderson Valdivino
IK0NMJ 2016-04-30 40m SSB JN63ha Italy VALTER BRILLI
IK0MIZ 2016-04-12 60m SSB JN61sf Italy ANGELO OCCHINI
MW3HAS 2016-01-18 40m SSB IO81IL83 Wales HASSAN MUSTAFA
VE9ZY 2015-11-20 40m SSB FN77ml Canada Malcolm William Smith
LA1TNA 2015-11-17 60m SSB JP20oi Norway Per-Dagfinn Green
RA5AO 2015-02-17 160m SSB KO85vq Russia Alex Kanin
G4LOE 2015-01-27 60m SSB IO92cj England GARY Tuppeny
EA7JJF 2015-01-20 10m SSB IM66vm Spain Antonio Flores Castao
SV2HJQ 2015-01-11 40m SSB KN00um Greece MICHAEL MOYLAKIS
PR8ZX 2014-12-20 10m SSB GI64gl Brazil Pedro Miguel Nogueira
CU7MD 2014-11-09 10m SSB HM58qm Azores Jos Manuel Barcelos de Vasconcelos
VE3YJ 2014-11-04 12m SSB EN93un Canada Rocco J. Furfaro
CX8DS 2014-10-31 10m SSB GF15vg Uruguay OSCAR EDUARDO SOSA MILLAN
GB1WSG 2014-10-18 80m SSB IO81tp England Special Event JOTA Station. 1st Wooton Scout Group Conygres Scou

Book Totals: 99 qso's   99 confirmed Get a free logbook at QRZ.COM

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