6BTV up an running.

 6BTV now under test.

After several delays I eventually got everything together and a break in the weather long enough to do something!   There had already been much pondering about shortest feeder run possible while keeping coax out of the way, getting the fatter coaxial into the shack would be a struggle. And of course, where would be the best place to put the six band trapped vertical that could meet this feeder criteria and be realtively easy to add counterpoise/ground radials to as required without causing too much disruption.

It ended up almost in the middle of the back yard, on an existing timber post that was 'over engineered at the time for no aparent reason'  

Fixed the antenna base plate to 4x4in timber post with six 3 in screws. 

Feedpoint about 3ft above ground level, Belden 9913 coaxial from antenna feedpoint to Joint-Box outside shack window. 

 Assembled antenna laid on long bench and roughly adjusted traps with Nano-VNA knowing they all change when up in the air.  This usially gets You somewhere close on a few bands but some will need a bit of a tweak to get them just right for the part of the band You will be working. This may seem like a bit of a pfaff at the time but it is all part of the process to make the antenna work as efficiently as possible on site. After measurments and some testing, adjustments are done one band at a time, working from the highest frequency down until all traps are adjusted and each band is tuned for your specific use. 

When deploying a trapped antenna each section has to be tuned, in sequence, on site for best results so the antenna has to be easy to drop for adjustments. Final tuning can sometimes take many drops and a fair bit of time to accomplish good results. It depends on what radios you are going to run on it and how You prefer to run Your station. 

When using radios tha do not have matching devices, eg; Yaesu FT707s and the like it is best to have the antenna resonant with a good 50 Ohm match for efficient energy transfer. Always best to actually tune the antenna rather than use an ATU to load the antenna system to match the radio.  

Note: Adding ground spike, counterpoise or ground radial wires has significant effects on antenna behaviour, feedpoint impedance and resonance, so make sure all connections are good before final tuning. Adding another 'ground line' means cheeking each band again and adjusting where required. 

In general adding ground radials improves efficiency but they can de-tune the antenna too, so always best to check. 

  In my case two para-cord guy lines get released and two backed off a bit to release all tension that may impede lifting.Antenna is then lifted off base pole and, lowered to ground, tilted down and laid on long bench for adjustments. It took me a few hours to get 10,15,20 and 30m just right before losing daylight and about an hour the following morning to get 40m and 80m a bit better.

I am currently running comaparative tests using FT8 narrow band digital mode on HF bands. 

Switching between 3 antennas, (only two on 80m, 40m)

G7FEK homebrew wire. 80, 40, 30, 20, 17, 15, 12, 10

DX Engineering 6BTV,  80, 40 ,30 ,20 ,15 ,10

A99 (upper element of center fed vertical)  30, 20, 17, 15, 12, 10

When I am not operating the FT8 station, it will be receiving and reporting to pskreporter map.

When left unattended the station is connected to the 6BTV under test.

All grounds and radials will be disconnected during some tests.

Currently running with one 10m ground radial to W.N.W. 

 

Paul Godley Transatlantic Centenary Special Event Station, Ardrossan.

 Special Event Station - GS2ZE - GB2ZE - GB1002ZE - Ardrossan - 11-12 Dec 2021

First we have to look back to the times when massive, high powered, expensive spark transmitters were used on very long wavelengths for long distance communication and it was believed that shortwave frequencies were of no practical use other than for short range local transmissions.

 1902

G. Marconi managed to get a single letter 'S' across the Atlantic on 5th December 1902 from Glace Bay, Nova Scotia, Canada to Poldhu (Cornwall) in England using a high power longwave spark gap  transmission.  For the next 19 years longwave transmitter and receiver stations were developed and used to send messages across long distances using enormous antenna systems and high power spark transmitters.  It was believed that signals could not be sent long distances using shortwave frequencies.

 1921

In December 1921 Paul Godley 2ZE received the first complete CW message sent by an amateur radio station across the Atlantic ocean on shortwave frequencies. This proved that long distances could be covered on shorter wavelengths without huge, high powered commercial radio transmitters. 

 The test results also proved that CW transmission was a far better mode than the spark gap systems in use at the time.  From 1922 many longwave spark gap transmitter stations were decommissioned and replaced with CW equipment as messages could be sent and received using smaller, cheaper more reliable stations running less power that generated less interference than the noisy spark gap systems. This began a new era in radio communications technology.

1921 Transatlantic Test shortwave receiver station at Ardrossan.

On 9th December 1921 Paul Godley 2ZE set up a receiving station at Ardrossan, Scotland. The receiving equipment used was a Paragon regenerative receiver, Type DA-2 detector-amplifier and a superheterodyne receiver with external beat oscillator. The receiver system used a total of ten tubes (valves) The radio equipment was housed in a tent, with an oil lantern for light and an oil stove for heat. A Beverage wire receiving antenna almost 1,300ft long was strung up 12ft above the ground over a series of poles carriying standard Post Office pattern insulators at 125ft intervals from the tent stretching down the seaweed covered field towards the sea. The phosphor bronze wire was grounded through a variable non-inductive resistance, the ground plates consisted of four lengths of iron pipe buried 4ft in the ground where they reached water. 

He spent the next few nights following the transatlantic test time schedules with an official listener, Mr D.E.Pearson, District Inspector of the Marconi company. They were listening for signals transmitted across the Atlantic ocean from selected amateur radio stations in America. 

At 02:52 GMT on 12th December 1921 Paul Godley received a complete CW message on 1.3MHz (230m) that was sent by 1BCG located in a farmers field in Greenwich, Connecticut. The Transmitter was running 990W into a T-cage antenna, 100ft long and 70ft high with 30 raised radial counterpoise wires each 60ft long. This may seem like a large antenna system and a lot of power but this was considerably smaller than the antennas used by longwave stations and with less than a kilowatt this station was using a fraction of the power normally used for longwave transmissions at that time. 

Up to this point it was believed that it was impossible to use shortwave frequencies for long range communication.

The successful reception at Ardrossan was reported by Paul Godley and Mr Pearson, a message containing the report was sent back to America via the high power, long wave Marconi transmitter station at Carnarvon in Wales where it was transmitted across the Atlantic to the longwave station at New Brunswick, America. 

The transatlantic tests continued until December 16th and more reception reports were returned. Several British amateur stations sucessfully copied CW signals from American amateur stations including, 1AFV, 1BCG, 1UN, 1RU, 1ZE, 1XM, 2BML, 2FP, 2ZC, 2ZL, 2ZU.  

100 years later. . .

2021 

A Special Event Station station was set up within one wavelength of the original location at Ardrossan. This was set up and operated by members of the Kilmarnock and Loudoun Amateur Radio Club  from 12:00 GMT on Saturday 11th December to 12:00 GMT on Sunday 12th December 2021.

The station was set up at short notice with equipment gathered together by KLARC members. We ended up with four HF sets on site. Two HF stations were operated at the same time, taking care what bands they were operating on to avoid causing each other QRM or desensitization of the receivers. We also had VHF/UHF and network assisted stations on site during the 24 hour event.

Working Conditions

It was cold & wet with bitter icy winds overnight at the Ardrossan Special Event Station site. This was  expected for December on the West coast of Scotland and everyone had dressed accordingly, although I did manage to fill my boots with icy water about 2am on sunday while we were stringing out a linked dipole antenna in the dark. The van provided shelter from wind & rain for equipment with a convenient table that was just big enough to fit two HF stations. A third 'portable' HF station complete with PSU, ATU, radios etc built into a self contained unit on wheels (Very neat 'shack in a box') was also used on Saturday evening. The 160m station and a VHF station were set up in cars parked beside the van, 240V AC power was provided by two generators, one powering equipment in the van, one for stations in other vehicles.   

Antennas

There were three monoband vertical antannas (30m,20m,17m) A multi-band horizontal 'linked dipole' strung between two small mounting poles with central pole mast to elevate the mid point providing a slightly inverted V configuration. The central pole-mast also carried a VHF colinear attached to the top. The linked dipole was held away from the mast attached to a pulley rope. This allowed for the antenna to be dropped and raised quickly for making band changes. This arrangement also made it easy to change over to the top band antenna at night for 160m operation.

 While the 160m station was operational the linked dipole was moved and temporarily erected to the west of the site. Center feed point lofted using extendable pole arrangement with wire sloped to 3ft poles at outer ends. After struggling for a while on 80m we dropped the antenna, unplugged 80m link and pushed it back up in the air to run 40m.  

At this point there were four stations operating simultaneously, the top band station on 160, two SSB HF stations , FT8 station working on 30m and the network radios operating via WiFi mesh and 4G bridge into MB7IAE connected into the FreeSTAR network. 

FT8 digi-mode

During the event the FT8 narrow band digital mode station was mostly working 30m as this was the most stable band throughout the 24hrs of operation at the site. Despite the poor HF band conditions the KLARC team managed to make many good contacts across the Atlantic and had QSOs with stations spread out across four continents. 

FreeSTAR network

We also made over 130 contacts with stations over the FreeSTAR network while operating with the GS2ZE special event callsign. Some of those who made contact over the network had no HF capability due to restrictions at their QTH or were unable to make contact on HF due to poor propagation conditions and were very happy to make contact with the Ardrossan centenary special event station using network assisted communications through linked repeaters, gateways, personal hotspots and software/apps on various platforms connecting a diverse range of  technologies.​ Several stations were also tracking our band changes reported over FreeSTAR network and trying to reach us on HF. 

We made contact with operators using many modes including DMR, WiresX, YSF, NXDN, P25, reflectors, Digital and Analogue gateways & repeaters, network nodes and ops using software solutions including, allstar & PiStar nodes/hotspots, echolink, droidstar, dudestar, peanut etc.. 

 

-+-

I know using network assisted communications at a Transatlantic event may seem odd to some. 

The reasoning behind it is that there are many licensed amateurs around the World who have restrictions at their location and cannot have an HF station on the air. Many landlords, housing associations and even some town planning departments do not allow antennas to be erected or fixed to structures at all !.  Working stations with special event callsign GS2ZE over FreeSTAR network at least gave some of those HF restricted operators a chance to make contact with the site during this historic event using whatever equipment they have available. 

 It only took a few minutes to deploy Inrico T320 (with high gain antenna for 4G data connection) and have Hytera PNC380 , Inrico TM-7 (MK1) and Android tablet connected with FreeSTAR connection live.  With over 130 contacts over the system in the limited times available I am happy that I set up the FreeSTAR station at this event. 

I used a few other systems during the event to keep in touch with friends, clubs and networks. The Inrico T199 (top right in above picture) screenless 16 chan network radio was handy outside when it was raining, (most of the time) The TM-7 was used in the van as it is 'not so waterproof'. The Hytera PNC380 (bottom right in above picture) is also waterproof and was used when I wandered off to the beach, and go beaten back by the harsh icy winds.

 Telegram, Zello and even Zoom (running on another T320) came into play a few times reporting band changes and receiving reports from stations hearing us on HF. 

I think we made best use of the technologies available to us, from throwing RF along a wire for CW on 160m to DV (Digital Voice) over 5GHz mesh and 900/800MHz data link into Global networks. It is all part of the ever broadening spectrum of equipment, modes and methods available to experiment with.

Many thanks to all those who worked GS2ZE, GB2ZE & GB1002ZE at the Ardrossan site on this historic occasion.

Please visit Kilmarnock and Loudoun Amateur Radio Club  for more information including links to videos and photos from the centenary special event stations site. 

73 de MM7WAB/2ZE (GS2ZE at Ardrossan event)