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4X1MA Israel flag Israel

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As of August 19 2014, I hold an advanced license with new callsign - 4X1MA

Lincensed since 1992 (ex. 4Z9CHB, 4Z5RZ).

After a decade of no ham activity (actually I was working as a 2-way communication specialist...) I decided to get back to the hobby.

Limited space for ham shack, made me decide for small size trasceiver with HF and satellite capabillities - FT-817.

This means I will work QRP, with all the pros and cons of it.

The major benefit of QRP is the simplicity of peripheral equipment.


Some of my home-brews:

9:1 UnUn Ballun

For feeding end-fed long wire, I use a home-made 9:1 unbalance-unbalanced ballun. Since it is for QRP, it can be small size:


I have made several balluns, in few configurations (such as with male UHF connector, etc.) for various operating positions.


Magnetic loop antenna

This antenna is for 20m-10m, can be powered with ~50W.

Feeding loop:


more experiments to come...


Yaesu FT-8x7 Bluetooth dongle

Connects PC to FT-8x7 and FT-100 with no cables



Portable/mobile antenna

For portable/mobile operation, I use an end-fed long wire antenna.

Wire is hang on 8m fishing rod pole, fed by 9:1 UnUn ballun.

Packed size of antenna is ~1m long, which can be easily stored in the vehicle.

The antenna is being used 10-40m bands.

This antenna gives quite good performance. I work with EU stations and US stations from time to time, with 5W only.

Setup case

Since I am lacking of storage/operating space, I put all the stuff in an aluminum suitecase. This is useful either when I work at home, from the kitchen's table or portable, as in photo below.


L-Match Tuner (still in progress)

L-Match tuner, designed for end-fed long wire antenna, contains 2 units: Tuner and controller.

Both units, are based on Arduino controller board.

Tuner unit has variable capacitor, rotated by servo motor. Inductor's value is tuned by relays for changing its length.

Communication between the 2 units is RS422, diffrential line serial communication physical.


New appartment

On August 2013, we have purchased a new (old) appartment. I have issued a new working space and a new end-fed antenna installations.


Previous installation:

150W linear amplifier

Based on Motorola broadband linear amplifier, with home-made LPF and controller (Arduino based)











Linkedin: http://www.linkedin.com/profile/view?id=55612561

Facebook: https://www.facebook.com/ohad.miller.1


1198863 Last modified: 2014-08-19 16:35:11, 5116 bytes

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