Did you see my post a page back on Emergency Mode?
External Tuner
- Thread starter jazzboypro
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yep
A 2:1 match or better is generally accepted as almost standard. 3:1 and you are loosing 3/4 of your EIRP.
I don't know how trustworthy the SWR reading on the meter would be, I take it with a grain of salt.
3 sensors in the ATU are forward power, reflected power, and antenna current.
Some internal ATUs have the tuning algorithm in the system brain, some have like a PIC16
the sensors can go out of adjustment and tuning stops before ideal match.
I would look at the antenna with an analyzer so see if it will go to 80 and 160 meters,
it may not.
I have a 33 foot vertical with an Icom AT-140. It will tune 80 and 160 meters nicely but don't get the performance I have with a broad band butterfly.
You don't need lots of power for FT8, even 10 watts is remarkable. If you can get 25 watts, you should do lots of logging.
I don't know how trustworthy the SWR reading on the meter would be, I take it with a grain of salt.
3 sensors in the ATU are forward power, reflected power, and antenna current.
Some internal ATUs have the tuning algorithm in the system brain, some have like a PIC16
the sensors can go out of adjustment and tuning stops before ideal match.
I would look at the antenna with an analyzer so see if it will go to 80 and 160 meters,
it may not.
I have a 33 foot vertical with an Icom AT-140. It will tune 80 and 160 meters nicely but don't get the performance I have with a broad band butterfly.
You don't need lots of power for FT8, even 10 watts is remarkable. If you can get 25 watts, you should do lots of logging.
All those tuners with servo rollerductors were badly slow. Relays are not the quickest but the new FET swithches are lightning fast.
What tuner uses that ?
The Palstar HF-Auto is an example of a servo-controlled roller inductor tuner. See photo. The large cylindrical object at the top of the photo is the roller inductor. The larger object with all the plates is the capacitor. Look to the right of both of them and you'll see the belt drives for the servo motors.
The Palstar HF-Auto is an example of a servo-controlled roller inductor tuner. See photo. The large cylindrical object at the top of the photo is the roller inductor. The larger object with all the plates is the capacitor. Look to the right of both of them and you'll see the belt drives for the servo motors.
I'm sorry i was not clear, i meant what tuners uses the FET Switches
Many of the newer tuners use a power fet switching diode. typically the stand alone smart tuners and under the 250 watt class.
Now you can look up all the schematics and specs for these tuners and note which uses relays or diode switching. sorry, but I just don't have the time for that.
Now you can look up all the schematics and specs for these tuners and note which uses relays or diode switching. sorry, but I just don't have the time for that.
Still beats the hand crank dials like my Collins transmitter.The Palstar HF-Auto is an example of a servo-controlled roller inductor tuner. See photo. The large cylindrical object at the top of the photo is the roller inductor. The larger object with all the plates is the capacitor. Look to the right of both of them and you'll see the belt drives for the servo motors.
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