TRF Wins

As the war moved away from the Middle East, Cairo became a major workshops and staging post. It was used as a point where Radio Communications to the Far East from the U.K. changed frequency. Usually part of the route was in daylight and part in darkness, appropriate choices being made. The traffic was mainly 75 wpm received on a re-perforator and then retransmitted.

Polygon Wireless Station was the transmitting station. Its large area and various extensions were laid out mainly with rhombic Aerials – that workhorse of the period. These are particularly suitable for such traffic. Although half the power appears in the terminating resistance an aerial gain of up to 50 db easily obtained given the space. The angle of the beam depends on many factors. Size and shape of the aerial, height above the ground, earth conductivity etc., etc. Practically any large aerial provided with various frequency inputs altered the angle and gain somewhat. With 10/12Kw in and 50 db gain on top for good measure Who care about a few degrees. Moreover, I had the only Bell Telephones Monograph on Rhombics in the Middle Last.

As communications multiplied, more and more aerials were installed. Soon local users such as the R.A.F. at Heliopolis, began to complain of interference. This was hotly denied by the Station Staff as they were not on the frequency jammed.

In those days landing instructions for aircraft were often in the 5/7 Mhz range and soon most aircraft flying over Polygon on their legitimate flight paths were being blanked out. It got so bad that we were called in to adjudicate

The results were well balanced. Polygon’s transmitters were peaking up on neighbouring aerials (you could see the output current increase as the key went down for the neighbouring aerial), and producing from their 1o Kw or so tens of watts of sum and difference frequencies. The R.A.F. receivers were so badly set up and designed that a surplus of two frequencies as they flew over Polygon also produced phantom sum and difference frequencies in the mixer oscillator.

Both sides promised reparation. Polygon used aerials as far as possible from each other, the P.A.F. lined up their receivers with more care and very careful what they used.

This reduced the incidence, but when it did occur even greater acrimony then before resulted. Again I was urged to adjudicate, but as the feeders went past our labs a few foot outside our fence the average AR88 or HRO also produced sum and difference answers, Luckily our friends the Wehmacht had liked simple solutions. They used in the field a range of vary nice TRF receivers from roughly 200KHZ to 20MHZ. These, having no mixer, were immune from the effect and we would solemnly hunt for the resonant frequency (usually around 7Mhz) with a suitable receiver thoughtfully left behind by our German friends. Two other gentlemen would check that Polygon were not cheating by turning off one of the components producing the two frequencies (they were quite capable of it!), A pronouncement would them .be made by me and peace was restored. God Bless the Germans, they had their good points.

E.G. Vast. – October 1979.

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G3MGQ’s Month on the Air

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Vital Spark Archive

Vital Spark newsletter articles

Take a look through a large selection of articles written by club members over the years which have been published in the monthly Vital Spark newsletter .

Used Ham Radio Equipment

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UK Amateur Radio Repeaters

UK repeaters

Click button above for full list, or a local repeater callsign below for info.

GB3EB 2m in Uckfield- Active
MB6EB 2m DStar Node in Eastbourne - Active
MB6RY Wires-X DigiGate in Broad Oak - Active
GB3HE 70cm in Hastings - Active
GB7HE 70cm DStar in Hastings - Coming soon
GB3ZX 70cm in Eastbourne - Low Power
GB3JT 23cm ATV in Hastings - NoV cleared
GB7RY 70cm X-Wires Repeater Rye - Active
GB7ES Eastbourne - DSTAR Rpt. - Active
GB3ES 2m in Hastings - Active

For a complete list of repeaters, head over to
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Popular pages

Get your amateur radio licence - Find out more about amateur radio licence training.
Month on the Air - G3MGQ's popular monthly DX contest/expedition list.
Wilf Gaye Memorial Cup - The clubs annual operating event in the memory of Wilf Gaye M0GYE.
St. Richard's College Buildathon/STEM/ARISS - HERC attends St. Richard's Catholic College for their various events surrounding the Tim Peake ARISS contact.
G3BDQ - John Hey's Rare QSL Cards.
Sussex Electronics Radio Fair - SERF Sussex Electronics Radio Fair 2016.
Vital Spark - A selection of articles re-published from the Vital Spark.
RSGB News - Find out how to get RSGB news on your mobile or PC.
Experimenters Corner - A selection of Proteus projects by Bob Gornal (G7DME)
BBADL - Bath Based Distance Learning Course.
Conquest Hospital Radio - Presented by HERC member Antony (G4CUS).
Radio Rallies 2016 - An up to date list of radio rallies scheduled for 2016.
Club QSL Cards - A selection of QSL cards the club has received over the years.
Other Newsletters - Excellent newsletters and magazines from other clubs.
TX Factor episodes - Take a look at the TX Factors YouTube videos.
John Taplin - A bio of the late John Taplin.

Amateur Radio Resources

Other Radio Clubs & RAYNET

BSARS - Brede Steam Amateur Radio Society

RAYNET - The Hastings and Rother RAYNET Group.

HERC members sites

Sigord - Gordon Sweet
Hastings Radio Comms - Andrew Haas-Campbell
Hoofbags - Liz Costa