COBWEBB ANTENNA PDF

COBWEB,HF,1/2W,8-BD,6,10,12,15,17,20,30,40M,KW . MFJ Cobweb Antenna turns your space problem into a stack of QSL cards from far away places . Ideal HF Antenna. Efficient. Transmitter power gets converted to RF, not to heating the ground, coax, or matching network components. G3TPW CobWebb Antenna for the 14, 18, 21, 24 and 28 MHz Bands All the other small multi-band commercial antennas that are available are less than.

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The rod supporting the balun box is a 42″ length of 0.

High Quality 5 bander CobWeb Antenna

Your country’s customs office can offer more details, or visit eBay’s page on international trade. This makes mine cm square. During recent range testing of a hexbeam I needed a horizontally-polarised resonant antenna covering 20m thru 10m which could be assembled and disassembled quickly and easily. Typically, when forming a dipole into a square shape, the impedance presented drops to around 12ohms — Hence the use of a 1: A lightweight aluminium mast is sufficient to carry the antenna.

The wires are coated with a UV resistent coat. Trim the four ends to form short pigtails. Email to friends Share on Facebook – opens in a new window or tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in a new window or tab.

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A BRAND NEW COBWEB ANTENNA TWIN WIRE CUSTOM BUILT AND 20 METERS | eBay

Add to Watch list. Most purchases from business sellers are protected by the Consumer Contract Regulations which give you the right to cancel the purchase within 14 days after the day you receive the item.

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You have now created a single transmission line with a Characteristic Impedance of 25 Ohms Now wind 8 turns of this twin cable onto a FT toroid to form a 1: Seller assumes all responsibility for this listing. Happy to announce 0. Not zntenna stockordered only on customer request, down payment required, delay at c.

Please allow additional time if international delivery is subject to customs processing. End 1 is inner-to-inner and outer-to-outer ie: The item you’ve selected wasn’t added cbowebb your basket.

CobWeb Aerial | M∅PZT

The ends of the dipole elements are connected to spacer cords approx 6″ long using the brass inserts from plastic connector blocks; this arrangement allows any slack to be taken up easily anetnna releasing the srews and sliding the wires through the inserts. Please enter up to 7 characters for the postcode.

Depending upon your circumstances, you may find this aerial visually more appealing that a 5-band flat-top fan dipole. Now bind the two 1: Now wind 8 turns of this twin cable onto a FT toroid to form a 1: The inner ‘X’ of the support structure comprises two 34″ lengths of 0.

No additional import charges on delivery. Thanks to my earlier test In stockshipped in 1 or two ccobwebb. Dimensions The following details my own build and what worked for me — Each piece of PVC sticks out cm past the ali-tube, with mm inside the ali and held in place via a through-bolt.

A Stormy New Year Celebration: Alpha Antenna M Multiband Military 2.

CobWeb Aerial

Ensure that the two Chokes are aligned – i. At one end of the assembly left side of the ‘photo connect the coaxes in parallel: Redeem your points Conditions for uk nectar points cobwehb opens in a new window or tab.

Buy it now – Add to Watch list Added to your Watch list. Easy to set up works well X Previous image. It was a experiment into compact multi-band HF aerials for the higher bands anrenna various solutions existed: These small sizes and the small packing size of 11 x 11 x cm makes this antenna well suitable cobwebh vacations, fielddays, SOTA and other portable activities.

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Find out more about your rights as a buyer – opens in a new window or tab and exceptions – opens in a new window or tab.

The Cobweb antenna covers the five upper shortwave bands 20, 17, 15, 12 and 10m. See the seller’s listing for full details. Good bit of kit. The overall diameter fits nicely inside the aluminium poles with a few turns of PVC tape either side of the fixing hole.

Subject to credit approval. Amateur Radio G3TXQ – Cobweb Antenna During recent range testing of a cogwebb I needed a horizontally-polarised resonant antenna covering 20m thru 10m which could be assembled and disassembled quickly and easily.

We believe in our product and hold ourselves to the highest standards. The design is the same as the low power Cobweb Antenna only using other materials to handle the load. The following table lists the wire dimensions that were used each side of the feedpoint, the distance from the anfenna of the structure to the wire corner, the minimum VSWR, the 2: Select a valid country.

Lay the two coaxes alongside one another and connect centre-to centre and braid-to-braid at each end. You have now created a single transmission line with a Characteristic Impedance of 25 Ohms.