LazTuner LT-Classic 4B Aerial Tuning Units Instruction Manual

LazTuner LT-Classic 4B Aerial Tuning Units

Product Information

Specifications

• Model: LT-Classic 4B
• Website: www.laztuner.com
• Manual Version: GB V1.2
• Date: May 2024
• Maximum Power: 4kW
• Material: Black aluminum front (4 mm) or bakelite front with copper plate inside (8 mm)

Product Description

• The LT-Classic 4B is a handcrafted antenna tuner designed by Lazaro F5UOO. It is a versatile antenna coupler with a coaxial input, two coaxial outputs, a Bypass, and a bifilar output.
• The device offers the transmitter an impedance of approximately 50 Ohms and helps widen the bandwidth of tuned antennas by decreasing the SWR.
• The LT-Classic 4B features a balanced output with a 1:4 balun, allowing adjustment for aerials with two-wire descent.
• It is not a true 100% symmetrical antenna coupler but provides excellent performance for most setups.

Usage Instructions

Connecting the Antenna Coupler

• Connect your transmitter to the coaxial input of the LT-Classic 4B using a suitable cable. Attach your antenna to one of the coaxial outputs based on your setup.

Tuning the Antenna

• Adjust the settings on the LT-Classic 4B to match your antenna requirements. Use the Bypass option if needed, and ensure proper grounding for optimal performance.

Monitoring Performance

• Monitor the SWR curve after the bridge on a dummy load to ensure that the impedance is around 50 Ohms for efficient transmission.

FAQ

• Q: What is the maximum power rating for the LT-Classic 4B?
• A: The LT-Classic 4B is recommended for use at a maximum power of 4kW.
• Q: Is the LT-Classic 4B a symmetrical antenna coupler?
• A: The LT-Classic 4B is not a true 100% symmetrical antenna coupler but provides balanced output performance for most setups.

Introduction

• “For many years I have endeavored to upgrade my station with high-quality elements and components. Oversized, maybe, but that’s what makes it great. Beyond anything that can usually be found in stores.
• I love beautiful things and an antenna coupler can be effective, unique, and beautiful. My last coupler took me several years to manufacture and refine.
• Everything is done by hand, patiently, from the capacitors to the chokes, to the case and its panel. What a pleasure when everything works.
• With LazTuner I want to make you love your antenna tuner.
• Small series, quality components, meticulous and unique work for each coupler, and the pride of using a high-class device. » 73, Lazaro F5UOO

Congratulations

• We are very happy to count you among the users of an LT-Classic-4 antenna tuner.
• All antenna couplers are handcrafted with care.
• These are unique pieces. Thus, the characteristics and the realization may be slightly different depending on the model.
• We invite you to read this manual as well as the recommendations to make the best use of your antenna tuner and to obtain the best results.

The LT-Classic 4 antenna coupler

• The LT-Classic 4 coupler is a versatile antenna coupler. It has a coaxial input and two coaxial outputs plus a Bypass and a bifilar output.
• An antenna coupler is to be used with good intelligence. It is not, in any case, a magic box which makes it possible to adjust an antenna but a device that makes it possible to offer the transmitter an impedance of the order of 50 Ohms.
• When a tuned antenna is used, the antenna coupler allows to the widening of the bandwidth by decreasing the SWR.
• The antenna coupler also offers a balanced output. It is structured around a 1:4 balun and allows you to adjust, all things considered, aerials with two-wire descent. This device, available on many couplers on the market, has limits and does not constitute a true 100% symmetrical antenna coupler.
• The LT-TWINDED antenna coupler is a true 100% symmetrical coupler which, combined with a bifilar downpipe plus the wire antenna, then constitutes the aerial system.
• Each LAZTUNER antenna coupler is a unique piece, handcrafted with care. Thus, the characteristics and the realization may differ slightly depending on the model. In the appendix, a calibration document for your device is attached.
• The LT-Classic 4 is the result of many years in the design and production of antenna couplers. It has been tested with powers well above 4kW but it is recommended for use at a maximum of 4kW.
• The measurement bridge has been the subject of an in-depth study over several months to obtain the best linearity in frequency and power without overheating. The components used and the production are of high quality.
• Likewise, the organization of the masses has been judiciously elaborated in the measurement bridge up to the mass on the coaxial which uses silver Amphenol “mass bells”.
• All parts used are new. These are not salvage materials.

Specifications

Specifications LT-Classic 4B

• Freq: 1,8 Mhz – 30 Mhz
• Power: 4000 w
• Range: 40 w – 400 w – 4 Kw
• Input: Coaxial
• Output: 2 Coaxial – ByPass – 1 Balanced
• Impedance: 20 – 1200 ohms
• Display: FORWARD – REFLECTED with 3 scales
• Lights: light Input 12V DC
• Size – weight: Rack 19 pouce – 13Kg

Description

Description of LT-Classic 4B

The LT-Classic4 is available in several versions:

• 4 mm black aluminum front,

• 8 mm bakelite front with copper plate inside.

• SO239, N or 7/16’’

LT-Classic 4 settings

Reading on the galvanometers:

• One scale per power range 40 W /400 W and 4 kW
• FORWARD: Power transmitted
• REFLECTED: Reflected power

The display is an indication. It is not a measuring device.

ATTENTION! DO NOT SET AT FULL POWER

• Start with a power lower than 40W,
• Adjust to obtain the minimum reflected power,
• Then switch to the 400W scale,
• Increase the power and adjust, if necessary, the settings,
• Then switch to the 4kW range.

The LT-Classic 4 antenna coupler can support 4kW. To guarantee the lowest possible HF return to the transmitter or the amplifier, it is recommended to carry out the adjustment with a 2-tone generator when high powers are used.
Adjustments and use must be made with the hood closed.
Be careful when reaching the ends of the variable inductor. Proceed slowly to avoid going to a stop..

Maintenance

Maintenance of LT-Classic 4
Your LT-Classic 4 antenna tuner has been calibrated and does not require adjustment.
The main board located at the front contains the various calibration potentiometers and must not be modified.
If the limit stop of the variable inductor is accidentally exceeded, the following operations must be carried out:

• Open the top cover,
• Carefully raise the wheel and its support,
• Turn the inductor button to reset it to 0,
• Position the wheel towards the bottom,
• Carefully lower the wheel and its support.

We must have

• Roulette to the bottom
• The indicator button on 0

The mechanical part most subject to variation over time is the variable inductor.
The recommendations :

• Never apply grease to the spool, roller, and worm.
• Do not remove existing grease on the endless screw.
• Do not touch the turns of the coil with your fingers.
• Every 4 to 5 months it is possible to clean the coil carefully using a cotton ball soaked in a deoxidizing product.

Each tuner is a unique piece, handcrafted with care. Thus, the characteristics and the realization may differ slightly depending on the model.

Load 20 Ohms

Load 50 Ohms

Load 1200 Ohms

Load 20 Ohms

Load 50 Ohms

Load 1200 Ohms

Versions of LT-Classic 4

The LT-Classic-4 is available in several versions with always the same quality requirements.

LAZTUNER – MANUAL LT-CLASSIC 4B 14 – V1.2 – May 2024

LT-Classic 4B www.laztuner.com Manual – GB V1.2 May 2024

References

• ACCUEIL - LAZTUNER

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