The 2-m-Quadlong was designed for 144,3 MHz to use it for
horizontal polarisation in the CW/SSB-modes.
Stacked versions see below!
|
Short Data of the DK7ZB-Quadlong
Gain 6,5 dBd, F/B 18,5 dB
3-dB-angle hor. = 72°, 3-dB-angle ver. = 70°
|
|
|
Picture right: Scheme of the Quadlong
Impedance 28 Ω
, feeding with the DK7ZB-Match
Dimensions for the 144-MHz-Quadlong:
Distance Loop-Reflector = 300mm
Important:
All lengths given from center
to center!
Lengths in the table below.
|
 |
 |
2x 28-Ohm-Quadlong stacked
Built by
Gunter, DL2DRG |
| Diameter
Loop rods |
Length
ver |
Length
hor |
Length
Reflector |
| 4mm |
782
mm |
314
mm |
1030mm
(8mm) |
| 5
mm |
785
mm |
314
mm |
1034
mm (5 mm) |
| 6
mm |
787
mm |
314
mm |
1033
mm (8 mm) |
| 10
mm |
797 mm |
314
mm |
1034
mm (10 mm) |
The stacked Version with the
25-Ω-Quadlong
|
For the stacked version the impedance of the single
Quadlong was changed to 25 Ω
at XX because with that impedance a clever stacking is possible. With
two lengths L of 50-Ω-coax
3/4- λ* V (with full-PE 2 x 103,5 cm) we have an impedance transformation to
100 Ω
at XX. With both cables parallel we get
50 Ω
at XX.
The first 45 cm of the cable starting at XX is wound to a coax-choke for
balanced feeding of the loop. The distance between the two antennas
(parts 3 and 10) is 110 cm. This feeding is described at the 2x25-Ω-Yagis
stacked (Lightweight-Yagis).
|
 |
Gain 9,6 dBd
F/B 21 dB
3-dB-angle hor. =
72,2°
3-dB-angle ver. = 30,0°
The gain is 9,6 dBd with excellent
radiation patterns. The 9,83 dBd in the right plots are without the
stacking losses.
Lengths (6-mm-elements):
Hor. (3, 4, 9, 10) = 298 mm
Ver. (1, 2, 7, 8) = 806 mm
Reflectors 1029 mm, 8-mm-Diameter
Distance Ref-Loop 295 mm
|
|
The 144-MHz-DK7ZB-Double-Quadlong
|
The Quadlong can be built up
with a double frame. The gain increases only 1 dB, but this antenna has a
greater bandwidth than the single Quadlong. Feeding with the DK7ZB-choke, the
same as for the Quadlong. |
 |
Data of the
DK7ZB-Double-Quadlong:
Impedance 28 Ohm
Gain 7,5
dBd F/B 19 dB
3-dB-angles
71,6° hor 54,8° ver |
The gain is 0,7 dB higher than the well known
"Double-Quad" by DL7KM and DJ9HO. The mechanical construction
is much easier!
|
The lengths ot the elements, distance center to center of
the tubes
| Ref.-Length |
1040 mm (8
mm) |
| D
(Ref-Loop) |
290 mm |
| 3, 4, 6
(hor) |
300 mm (6
mm) |
| 1, 2, 5,
7
(ver) |
718 mm (6
mm) |
 |
The 144-MHz-DK7ZB-4x-Quadlong
Data of the DK7ZB-4x-Quadlong:
Impedance 50 Ohm
Gain 9,3 dBd F/B
17 dB
3-dB-angles
71,8° hor 36,6° ver
|
| Ref.-Length |
1040 mm (10
mm) |
| D
(Ref-Loop) |
325 mm |
| 3, 4, 6,
9, 12 (hor) |
284 mm (10
mm) |
| 1, 2, 5,
7, 8, 10, 11, 13 (ver) |
703,5 mm
(10
mm) |
|
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