Andrews Communications - TET-Emtron Antennas

Please order by phone; 02 9688 4301/9636 9060/9896 8972,
by fax; 02 96881995, by email; radioandrews@hotmail.com
or by mail; P.O. Box 240, Pendle Hill, NSW, 2145.

Emtron HF vertical antennas

TEV-1 broadband HF vertical

$279 AUD

The TET-Emtron model TEV-1 is a 8.5 metre long vertical broadband HF antenna. It comprises six 1.5m long sections of aluminium tubing.
All stainless steel hardware and rugged aluminium construction ensure long and reliable operation.

The TEV-1 should be mounted on top of a metal pole. The antenna's height may be set from 30cm (one foot) above ground level to virtually any height above ground.

In the case of mounting the TEV-1 above a metal roof, it should be mounted at a height of at least 2m above the metal roof in order to reduce excessive ground reflection which causes higher radiation angle!

The minimal compromise height above ground for a vertical antenna operating 80m to 10m bands is 3m.

This is because on the 80m band the optimum radiation angle is ~30 degrees and this occurs when the vertical is mounted at, or just above ground level. Remember, the longer the wavelength, the greater the ground plane required. The ground plane radius for an 80m band vertical is ~21m (i.e. 1/4λ + 5%).

However, up the 10m band the optimum angle is ~10˚ and this occurs at about 10m (or 1λ) above ground. The ground plane radius for a 10m band vertical should be ~2.625m (i.e. 1/4λ + 5%).

The TEV-1 doesn't necessarily need ground plane radials, but adding radials will improve its performance.

The antenna is predrilled.
By following the simple instructions, you will find that the antenna is quite easy to assemble.

Some methods of feeding the antenna are:

Directly with a long wire into a high impedance tuning auto tuner (e.g. LDG, MFJ tuners or an Icom AH-4 or SGC-237), then into 50 ohm coax cable going back to the shack
By fitting a 4:1 balun at the feed point, then running 50 ohm coax to a tuner in the shack
Directly with 450 Ohm ribbon, then into a 4:1 balun and antenna tuner at the shack
Inductively, by fitting a series base loading coil. However, adding excessive inductance may make the antenna more difficult to tune on 10m, etc.

NEW TEV-1S!

TEV-1S broadband compact
5.45m long HF vertical

$P.O.A. AUD

The TET-Emtron model TEV-1S is a 5.45 metre long vertical broadband HF antenna. It comprises six 1m long sections of aluminium tubing.
All stainless steel hardware and rugged aluminium construction ensure long and reliable operation.
Appearance is similar to TEV-1.

The TEV-1S should be mounted on top of a metal pole. The antenna's height may be set from 30cm (one foot) above ground level to virtually any height above ground.

In the case of mounting the TEV-1S above a metal roof, it should be mounted at a height of at least 2m above the metal roof in order to reduce excessive ground reflection which causes higher radiation angle!

The minimal compromise height above ground for a vertical antenna operating 80m to 10m bands is 3m.

This is because on the 80m band the optimum radiation angle is ~30˚ and this occurs when the vertical is mounted at, or just above ground level. Remember, the longer the wavelength, the greater the ground plane required. The ground plane radius for an 80m band vertical should be ~21m (i.e. 1/4λ + 5%).

However, up the 10m band the optimum angle is ~10˚ and this occurs at about 10m (or 1λ) above ground. The ground plane radius for a 10m band vertical is ~2.625m (i.e. 1/4λ + 5%).

The TEV-1S doesn't necessarily need ground plane radials, although radials will improve its performance.

The antenna is predrilled.
By following the simple instructions, you will find that the antenna is quite easy to assemble.

Some methods of feeding the antenna are:

Directly with a long wire into a high impedance tuning auto tuner (e.g. LDG, MFJ tuners or an Icom AH-4 or SGC-237), then into 50 ohm coax cable going back to the shack
By fitting a 4:1 balun at the feed point, then running 50 ohm coax to a tuner in the shack
Directly with 450 Ohm ribbon, then into a 4:1 balun and antenna tuner at the shack
Inductively, by fitting a series base loading coil. However, adding excessive inductance may make the antenna more difficult to tune on 10m, etc.

TEV-1 BROADBAND 1.8-54MHz antenna options...
Type	Price $(AUD)
The TEV-1 HF vertical antenna. Rated to accept 1kW pep on SSB. The six aluminium 1.5m long telescoping tubes assemble to create a 8.5m long antenna. Packed length is 1.5m. Weighs 4kg., unpacked. The strong aluminium U-channel mounting bracket is 37cm long x 50mm wide x 25mm high. The four supplied stainless steel U-bolts accept up to 35mm o.d. mast. Two specific TET insulators are included. Active and earth feedpoint connections are made via two long stainless steel nuts and bolts. The active termination bolts to the lowest point on the antenna's lowest tube whilst the the earth contact bolts to the lowest point on the antenna's U-channel mounting bracket. Proudly made by TET-Emtron in Perth, W.A., to our specifications.	TEV-1 antenna only is $279
NEW! The TEV-1S HF compact vertical antenna. Accepts 1kW pep SSB. The six aluminium 1m long telescoping tubes assemble to create a 5.45m long antenna. Packed length is 1.0m. Weights 3kg., unpacked. The strong aluminium U-channel mounting bracket is 37cm long x 50mm wide x 25mm high. The four supplied stainless steel U-bolts accept up to 35mm o.d. mast. Two specific TET insulators are included. Active and earth feedpoint connections are made via two long stainless steel nuts and bolts. The active termination bolts to the lowest point on the antenna's lowest tube whilst the the earth contact bolts to the lowest point on the antenna's U-channel mounting bracket. Proudly made by TET-Emtron in Perth, W.A., to our specifications.	TEV-1S antenna only is $P.O.A.

TET-Emtron antennas