QRZ.COM
ad: elecraft
Please login help/register callsign: password: secure login
Database News Forums Swapmeet Resources Contact
 21:11:24 UTC 22 Nov 2014 
Advanced Search Current Hot Callsigns XML Logbook Data QSL ListMaker Database Downloads DX Spotting Network Ham Club Database QSL Corner Top Web Contacts Expired Callsigns QRZ's 1993 FCC Database Daily Update Reports Just Added Callsigns Database Help Forum
Amateur Radio News General Announcements Special Events, Contests, etc. Hamfests and Conventions Silent Keys Headlines
Forums Home Discussions, Editorials, Talk Technical Forums Logging and Contesting RV and Mobile Help Forums
Ham Radio Gear for Sale Ham Made Gear General Merchandise Swapmeet Hot List Ham to Ham References Stolen Radios, Scams and Rip-offs
Site Menu... Practice Amateur Radio Exams Amateur Radio Study Guides Online License Renewals License Wall Certificates Commercial Ham Radio Links DX Country Atlas Grid Mapper Ham Radio Trivia Quiz Life Member Honor Roll
Help Desk, for accounts, lost passwords, etc. Add your callsign to QRZ Subscription Services Users Help Forum Frequently Asked Questions - FAQ QRZ en Espanol Privacy Statement Advertise with QRZ List of Current Advertisers About QRZ Donate to QRZ Contact us
ad: L-HROutlet
ad: l-assoc
ad: l-tentec
ad: l-rl
ad: l-Waters
ad: l-innov
ad: l-gcopper
ad: l-Heil
ad: l-WarrenG
4X1MA Israel flag Israel

Login is required for additional detail.

Ham Member Lookups: 2697

   

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)

  

 

 

 

 

 

 

 

 

References

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

Login Required

Login is required for additional detail.

You must be logged in to file a report on this page

Please login now...

Currently updating logbook display.
ad: giga-db
Copyright © 2014 by QRZ.COM
Sat Nov 22 21:11:24 2014 UTC
CPU: 0.043 sec 40208 bytes mp