For the given bandwidth this Yagi shows quite a low Antenna Temperature and good gain for its length. With these attributes it shows a very good Antenna G/T ratio. The bent DE (K6STI style) transforms to 50 ohms at feed point for direct feed. Design date of issue: 2024-06-21

The GTV 2-16w mark 2 replaces the GTV 2-16w, which was created in 2013.
Frequency response is defined clearer and Antenna G/T better with the mark 2 design. See here


The old GTV 2-16w design is here

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GTV2-16w mk2 built by OK4C

Repost from first use in the 2024 VHF Region 1 ctest by Zdenek, OK1DSZ on behalf of OK4C team:

"We have built 4 antennas using your calculation for 10mm elements and OK5IM element holders. The same way as last year when building the YBN 2-8m, there was no need for any tuning. All 4 antennas were exactly in the band without any adjustment with return loss at 144.300 around -30dB on each antenna. Amazing! The experience during the contest was also good. We had 2 stacks of two antennas each, one covering most of the time Italy, the other one mostly 9A/YU/E7, both on 15m masts. In both cases it fulfilled our expectations.
... . All in all it was great outing using in total 20 antennas designed by you."

Link to OK4C website with report of their 2024 VHF Region 1 ctest with more photos and video.
Antennas used: 4 x 4 x vert. YBN 2-8m plus 2 x 2 x vert. GTV 2-16w mk2:

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GTV 2-16w mk2 3D pattern plot at 144,1 MHz

Performance Data

Specs: with 10 mm elements @ 144.1 MHz

Gain vs. isotr. Rad.  16.96 dBi
Gain vs. Dipole       14.81 dBD
-3 dB E-plane         27.0 deg.
-3 dB H-plane         28.4 deg.
F/B                  -35.17 dB
F/R                  -27.2 dB
Impedance               50 ohms
VSWR Band Width       1.14:1 *
Mechan. Length        9896 mm plus boom end offsets
Electr. Length        4.76 λ

Stacking Dist. h-pol. (144.1 MHz)
top-to-bottom         4.240 m or 13.9 ft
side-by-side          4.456 m or 14.6 ft

*) as in VE7BQH G/T table = at 145.00 MHz

How many VHF operators have been looking up the mark 2 design since its release in June 2024?

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Geometry

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Table 1: This Yagi with 8 mm elements on a 25 x 25 mm boom with standard insulators

Ele. 8.0 mm DE 10 mm Boom 25 x 25 mm

"Ready to saw and drill" data for mounting elements on boom with BC according DG7YBN for standard insulators as sold by HFKits.nl, WiMo, 7arrays, Tinos Funkshop.

Includes an SBC of 2.34 mm

Read abt. the SBC here .

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Table 2: This Yagi with 10 mm Dipole, 10 mm Elements on a boom 25 x 25 mm w. Element holders by OK1IM or SP6GWN

"Ready to saw and drill" data for mounting elements on boom with BC according DG7YBN with added offset for these holders (approx. 500 kHz) as sold by radio-shop.cz.

Ele. 10.0 mm DE 10.0 mm Boom 25 x 25 mm

Note: All the above include a "Segmentation Density Correction" (SBC) of 2.34 mm per element
plus added 2.93 mm for shift of the SP6GWN insulators against the 'Standard Insulators'.

Read abt. the SBC here .

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Sketch of Bent Dipole

The Drivers diameter is 10 mm for all examples.

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Pattern and VSWR Plots

Elevation and Azimuth plot at 144.1 MHz

 

RL and SWR plots - simulated

Gain and F/B, F/R

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Downloads

None so far.

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Stacking

Stacking Dist. h-pol. (144.1 MHz) per DL6WU formular
top-to-bottom         4.240 m or 13.9 ft
side-by-side          4.456 m or 14.6 ft

Plot and data of 2 vertically stacked GTV 2-16w mk 2 using 100 percent DL6WU stacking distances

Antenna View & Elevation Pattern

Elevation plot: Free Space (left)                  lower Yagi 6 m above 'Perfect Ground' (right)

   

Plot and data of 4 x GTV 2-16w mk2 in H-config using 100 percent DL6WU stacking distances

Elevation & Azimuth Pattern

   

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Antenna G/T Analysis:
• Excel version of AGTC_lite screenshot (Tsky = 290 K, Tearth = 5400 K)

Mind that this Yagi covers most of the 2 m band with a Return Loss better -24 dB .

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73, Hartmut, DG7YBN