开云体育

hey

can anyone help me with the factory set/ right setting for the RV1 Variable Resistor on the first Ubitx 3 board(tda2822 fci soundchip)? On the main page from hfsignals i read only the adjustment about the RV2.. so my other question were about the RV3..?

thankfully for any help

Best Regards Fabian

Hi Fabian,

RV2 and RV3 have to be adjusted both in the same way. See?
Referenced there as: ?Locate the two PA bias presets (the blue square ones)“.
?
Also you can have a look into the schematics if you are interested. And be very careful adjusting them. It’s easy to blow the IRF510s.

RV1 is the ?drive control“ pot for the PA. ?Controlling somewhat the output power (and possible distortions if set too hgh). But I don’t know how exactly the preset value is adjusted in the factory. Maybe they do some measurement of input and output signals for alignment. Or maybe they just turn it to the same position on all boards?

If you haven’t started already changing them, I recommend to better leave all 3 of them at the factory preset until ?your receive problem is solved.

Armin

hi, cool to see you again here in post, can we make a call in german "relay station"? when you have echolink, you can call the "thüringen link-node" and we can speak over this, that was really nice if we can me a little qso in german language?

to the post, ok the RV1 is the drive level, yes a read a few other post with this declaration but not the correct position.. but i've adjust at all RV1,2 and 3 when i was such for the first right alligment...

on this way i can set RV2 and RV3 at 100ma, each one.. but the RV1 level is not able to be set without the real messuarment device? for this i recommend a power watt meter, right?


thanks for your help and you can look for the qso conversation at the thüringen link node if you want, just a correct time we need.

regards Fabian

If he does not have? an RF powr meter he can put in a 10 W 50 R non inductive load and add a a two diode RF probe and measure the peak DC on a DVM. There are? passive? RF probe designs all over the internet .. some are right some look suspect.? ? Go to?? on page 15 of the manual there is an RF probe.? It should have say a 15K load on RHS to make it responsive rather than letting the DVM bleed it down.? .. that is all you need to pseudo measure power as peak RF .?

RV1 set for 10-12W out on 80M after setting bias on RV2,3.

Setting bias for the finals.? you require a milliamp meter in the range of 500-600ma maximum.
Break the connection for the BROWN (middle power pin) lead and inset meter.
Turn RV2/3 to minimum (they are backward so that is clockwise).? GO to transmit SSB
with no audio adn note current it should be very low.

Now with that set up advance RV2 for 100ma more than the base reading.? Then advance RV3
for 100ma increase to that.? you are now done re setting bias.

With modulation go back and reset RV1 for max of 12W at 80M.? HIgher bands will normally
produce less power.

NOTE for this the board is V3 or V4 as there is no significant change in transmitter there.

Allison

Jim<

Key or mic button?? IF CW you get more like 2A and power out.

Minor thing....

Allison

Oh thank you all for your answer to me..

the rf power meter was need i know.. but i have a wish to make this real with a arduino and this bridge for swr and power meter.. on youtube i have seen.. but no circuit found only the arduino code on russian hamcq forum..for this project here

or this looks good option, too but without shematic

this is what i looking for.. because i have arduino with no use here and it looks like an ability for daily use when build up in a good case.. and i dont have money to buy real equipment on stores.. so i can just build all at self..

have anyone an idea and shematic about these arduino swr/power meter?

Google? swr and power meter arduino

www.qsl.net/on7eq/projects/arduino_pwr_swr.htm


First two hits.? The board used in KK5jy can be bought but also hand made as its
really simple.

Allison

OR??

Tim suggestion is a low cost and rather precise solution for rf power measurements to 25w .