Kelemen

Kelemen LogoWe manufacture high performance λ/2-antennas made from high quality materials. The most prominent features are:

• wide bandwidth

• high efficiency

• low weight

• Weather- and temperature proof

• 50Ω feed line

Besides the fullsize dipoles we offer shortened dipoles which are favorable when you have only limited space available. The shortened dipoles use extension coils made from Teflon cable. The stronger the shortening the smaller the useable bandwidth, in some cases an antenna tuner might be required.

Like all Kelemen antennas the shortened dipoles are very light and weather and temperature resistant as well.

 

Kelemen Trap Dipole Antennas

Kelemen antennas are wire antennas with traps made from teflon isolated coaxial cable.

• Properties of Teflon (PTFE):

• resistant to solvents like acids and alkalines

• not flammable (temperature resistant from -90° to +260°C)

• high resistance against arcing

• ozone resistant

• resistance to water seepage

• low permeability against water vapour (0.31 mg/cm3 per 24h)

• does not melt (high temperature resistance)

• unlimited lifetime, weatherproof

• small space requirements at high voltages

The coaxial traps are very light compared to traditional traps, allowing a better average height above ground. Many portable operations prefer these light antennas because a simple glassfibre pole is often sufficient to lift the antenna. The special traps of Kelemen antennas have a high Q and therefore low losses. All baluns come with a lug for installation.

 

Kelemen antennas are manufactured from high quality materials. All cast parts are milled from weather proof polycarbonate; all hardware like screws, washers, nuts and clamps are made from stainless steel. Our baluns have a bolted, clear polycarbonate case and are not filled with insulating plastic like other baluns. This makes the production of these baluns much more expensive, also because we still have to make the baluns weather resistant, but this method has a clear benefit: In case of an 'accident' you can fix the balun yourself. And it is much lighter than other, conventional baluns.

Trap Antennas - what is that?
By insertion of tuned circuits (traps) into each side of a dipole additonal resonances can be produced. Trap dipoles are usually a little bit shorter than fullsize dipoles and offer multi-band operation at places, where space does not permit to install larger antennas.
But with such dipoles the larger weight due to the traps has to be considered: traditional traps have a high weight and lead to much higher tension forces of the wire, the antenna has a sag in the middle. Due to the loss of average height the radiation angle climbs and the efficiency drops. So it is important to manufacture traps with as little weightas possible.
Further, trap dipoels are no wide band antennas: The SWR climbs rapidly when working off the resonance frequency. In some cases the use of an antenna tuner is required.
The location of a trap dipole is more critical than with monoband dipoles. The antennas should be placed (as with any antenna) as high and as free of obstructions as possible, to avoid shifting the resonance frequency. Install as far away from buildings as possible. As a reference height for the design of the Kelemen dipoles we assume an average height of 10m above ground.

Inverted Vee installation of wire antennas
If, due to space limitations, the antenna can not be installed in a horizontal manner, the inverted-V mounting is a good alternative. The radiation angle is lowered and more suitable for DX, and only one center pole is required for installation. The angle between the two dipol side should be between 90 and 130 degrees, and it should not be less than 75 degrees. The ends of the wire should not touch the ground but end some meters above ground, perhaps they require extensions with insulating rope.

Included in delivery:

• Antenna ready to use

• balun with PL socket

• insulators

 

Note: The dipoles are always manufactured slightly longer than required for the lowest band. This gives the user the possibility to adapt the antenna to the local conditions (height above ground, ground conductivity etc.). This means that in many cases it will be necessary to shorten the length of the Kelemen dipole for the lowest frequency band.

Kelemen antennas are available for powers from 400 Watt to 2000 Watt depending on the model, see table. All power specifications refer to PEP SSB or CW, where CW means 'morse' and not 'continuous wave'.

 

Kelemen Multiband Trap Dipoles

max power up to 500W

Antenna 160m 80m 60m 40m 30m 20m 17m 15m 12m 10m Max Power Length Article No
DP-160804030                     400W 45m 11500.L843
DP-1608040                     400W 52m 11500.L84
DP-8040                     400W 30m 11500.84
DP-8040-S                     400W 27m 11500.84S
DP-806040                     400W 28,5m 11500.864
DP-804020                     400W 26m 11500.842
DP-801510                     400W 31,5m 11500.851
DP-8040201510                     400W 22m 11500.84251
DP-804030                     400W 27m 11500.843
DPK-8040                     400W 22m 11500.K84
DP-4020                     400W 16m 11500.42
DP-4030                     400W 16,8m 11500.43
DP-40201510                     400W 11,6m 11500.4251
DP-201510                     400W 11,6m 11500.251
DP-WARC 3 Band                     400W 10m 11500.376
DP-WARC+40                     400W 12,6m 11500.4376
DP-WARC+8040                     400W 22m 11500.84376
DP-4030201510                     400W 10,6m 11500.43251

Just click onto the link and it will take you directly to the product page.

max power above 500W

Antenna 160m 80m 60m 40m 30m 20m 17m 15m 12m 10m Max Power Length Comment Article No
DP-160804030-H                     2000W 46m   11500.L843H
DP-1608040-H                     2000W 54m   11500.L84-H
DP-1608040-H                     2000W 52,5m SSB-Bereich 11500.L84-H-P
DP-16080-H                     2000W 66m   11500.L8H
DP-16080-SH                     2000W 48m   11500.L8SH
DP-8040-H                     2000W 32m   11500.84H
DP-8040-SH                     2000W 27m   11500.84SH
DP-804020-H                     2000W 28m   11500.842H
DP-8040201510H                     2000W 22m   11500.84251H
DP-804030-H                     2000W 28m   11500.843H
DPK-8040-M                     1000W 22m   11500.K84M
DP-4020-H                     2000W 17m   11500.42H
DP-4030-H                     2000W 16,8m   11500.43H
DP-201510-H                     2000W 11,6m   11500.251H

Just click onto the link and it will take you directly to the product page.

 

 

Kelemen Monoband Dipoles

Antenne 160m 80m 60m 40m 30m 20m 17m 15m 12m 10m Max Power Length Comment Article No
DPK-160-24m                     1000W 24m   11510.KL24
DPK-160-38m                     1000W 38m   11510.KL38
DPK-160-38m                     1000W 19m   11510.K80
DP-80                     1000W 39m   11510.80
DP-80-H                     2000W 39m   11510.80H
DP-80SSCW                     400W 39m SSB/CW-Bereich umsteckbar 11510.80SSCW

Just click onto the link and it will take you directly to the product page.

 

Page:
  1. Kelemen DP-8040201510 400W 22m
    Brand
    Kelemen
    SKU
    11500.84251
    €269.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  2. Kelemen DP-8040-H 2kW 32m
    Brand
    Kelemen
    SKU
    11500.84H
    €199.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  3. DP-16080-SH 2kW 48m
    Brand
    Kelemen
    SKU
    11500.L8SH
    €199.00
    incl. 19% VAT plus shipping
    Not in stock, back in 7 days.
    Details
  4. 11500.84251H
    Brand
    Kelemen
    SKU
    11500.84251H
    €323.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  5. Balun 1:1, 2000W
    Brand
    Kelemen
    SKU
    11530.1.2000
    €79.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  6. DP-1608040-H
    Brand
    Kelemen
    SKU
    11500.L84H
    €229.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  7. Dipole DP-804020-H 2kW 28m
    Brand
    Kelemen
    SKU
    11500.842H
    €229.00
    incl. 19% VAT plus shipping
    In stock, shipped in 3 to 4 days.
    Details
  8. Dipol DP-160804030-H 2kW 46m
    SKU
    11500.L843H
    Brand
    Kelemen
    €279.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  9. DP-WARC+8040 400W 22m
    SKU
    11500.84376
    Brand
    Kelemen
    €255.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
  10. Kelemen DP-201510 400W 7,6m
    Brand
    Kelemen
    SKU
    11500.251
    €153.00
    incl. 19% VAT plus shipping
    In stock, shipped in 1 to 2 days.
    Details
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