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Special info station PA0GTB
Former Antenna Solution PA0GTB
A possible solution if you live i a apartment-
Sorry, the time of big Antenna farms is over. You must find another solution Hi… I found a solution in making use of the Yaesu “Active Tuning Antenna System” (ATAS)
Yaesu Active Tuning Antenna System, ATAS-
The Atas 120A is a adjustable Mobile Antenna, which can be used on several HF, VHF and UHF bands ( 7 Mhz -
To make use of the lower HF bands, you need an good Counterpoise !
For 6 and 2 meters and 70 cm band, you can use of a optional Balcony Mount Counterpoise Kit
The Yaesu ATBK-
This antenna also can be used with the Yaesu FT-
Principle of a Adjustable Antenna (Screwdriver Antenna)
The principle of such a antenna is shown in the picture below. You wil find similar antennas in Ham Stores Etc. The Principle is that from a screwdriver
See the picture below to understand how it works.
Thanks to PH0RMH who selfmade such a “screwdriver antenna”
Counterpoise Radials ATBK-
The Principle of a Adjustable Antenna
To give this antenna on VHF/UHF a preferred radiation direction, you can use the optional Counterpoise radial kit Yaesu provides (ATBK-
Some HAMS have second thoughts about this kit, but i can tell you that it really works to give this omni directional some preferred radiation on 6 en 2 meters and 70 cm.
My Situation :
As I told you before, i Live in a apartment-
The Owners Association in 2012 gave me permission to put up a small antenna for Ham radio purposes. I even got permission from one of the owners to put the antennes on his storage-
You can imagion, that i was very pleased with this offer :-
This was much, better than placing a antenna on my own place on the Groundfloor.
This storageplace, actually a small outhouse, has a surface of 12 m2, and has a Zinc Roof. Ideal for me to use it as a Counterpoise for my ATAS-
Design mounting platform
I made a design and a sketch how i wanted to mount the antenna. My Son in Law, who works i the metal industry, provide me with the things i needed.
The whole thing consists of 2 parts. A bracket to mount against the side ot the outhouse, and a pre-
Another important part was the Antenna Base to place the ATAS-
To make shore that all parts of this Bracket and the antenna-
But I could not find this paste in Europe (!) So i must ordered it in the USA.
Afther the paste was delivered, i could mount it all together on the roof.
Mounted bracket and base
My own experiences
My first experiences with this ATAS-
When you switch over to 6 or 2 meters or 70 cm band, the FT-
No problem to be QRV on all bands. Only 80 mtrs band is not available with this antenna.
I’ve have made more than 2000 QSO’s with this antenna. My favorite bands, with good results are 10, 20 and 40 mtr. Of course, if there is a pile-
But i’m glad i can exercise my hobby again, having new experiences. I’ve noticed that during my absence of almost 10 year much is changed in our World.
Tall trees catch much wind
Yes, thats a saying in Holland… hi..
But antennas, mounted on high levels could also experience other problems
with bad weather. I’m not worried about the windload of this antenna, but i have taken care of potential discharges (statics)
I’ve put some extra turns in the coaxcable and below on my terrace, where the antenna goes into the house, i use a overvoltage protection with fuses.
The antennacable, who goes down from the roof to the terrace, is a sturdy boy…hi..
This cable shuld last for many years. Becqause the antenna is on the roof with someone else, i can’t go there every time i want to change anything.
Cabling and en Overvoltage Protection
The coaxcable i’ve used outside is a Cellflex LCF 12-
So no worries about losses…hi..
Downstairs, om my terrace, its mounted on a box with N-
From there i go futher with Aircel 7 Cable into the house and to my shack.
In between i’ve mounted the Overvoltage protection.
If you want to know more of this ?
Feel free and contact me : email@example.com