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Hi,
I have a FT-897D controlled via CAT and 1/2 G5RV and I would like to build an antenna tuner. I have a rotary capacitor (20-150pF). I wind the coil and ceramic switch 1×12 is also available. Advise something tested and reproducible.
thanks for the help
St. Ok1ujl
Try to look http://www.arrl.org/tis/info/tuner.html
TUNER ANTENNA
The antenna box I use is worth recommending for several reasons. First of all, it is easy to make and not expensive, but most importantly, that is equally easy to tune. I made the box based on the SP6SYV description. For order power 150 All you need to build it is tuning capacitors from tube receivers. The box diagram is shown in the drawing
The coils are made of copper wire 1,5 the 2,5 mm2 as air. The supporting structure is a laminate plate with drilled holes. After winding the coils of the appropriate diameter, they should be "screwed in".” into a previously prepared plate. We fix the coils with glue, e.g. „super glue”. The method of making the coils is quoted from SP4ABR
The box has two switchable antenna inputs switched by a mechanical switch. In my box I used relay switching. I also use relays to switch two independent antenna inputs and a bypass” i.e. a system that bypasses the box. The whole thing is complemented by a built-in reflectometer.
Tuning the box is so simple, that it can be initially tuned for the best reception using the C2 capacitor. and then correct the tuning when switching to transmitting by selecting the mutual ratio of the capacitances of capacitors C1 and C2. It is worth equipping the C2 capacitor with a small gear 1: 4 which will facilitate precise tuning.Radio journal 3/97-11 I've been using it for more than a year, it's OK
If you don't have this time, write to my e-mailLaco OM4DA 73!
Power supply for 4xGU50,
I don't have a written text, but a few of my photos might give you an idea.http://www.ok2ien.net/index.php?option=com_rsgallery2&Itemid=27&catid=1
This is a classic L link with the possibility of switching C before and after L.
73 we locksmiths know 🙂
I still forgot,
if you have FT857, 897 you, like me, have the opportunity to build an FT meter into the tuner. You will thus get an accurate overview of PSV, performance, modulation etc….The FT meter can be found on the OK2FJ website.
73 Ludek
@OK2IEN wrote:
Power supply for 4xGU50,
I don't have a written text, but a few of my photos might give you an idea.http://www.ok2ien.net/index.php?option=com_rsgallery2&Itemid=27&catid=1
This is a classic L link with the possibility of switching C before and after L.
73 we locksmiths know 🙂
