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Farhan, You didn't specify where or details.? This is the revised sBitx or some proto? What the bias when cold and after immediately after a keydown session? While my amps do not exhibit this,

DJ9BFC, Yes it could and no not in that circuit.? However to get the needed thermal coefficient it needs to be two diodes in series. The npn is a 2n3904 that is mounted on the heatsink near the

Make sure meter is set to “peak” power, not average power. bob wd8lic

why is there an npn transistor used as temp sensor?? would not a simple 1n4148 also do the same thing?? dg9bfc sigi Am 18.11.2023 um 19:13 schrieb ajparent1/kb1gmx:

Allison, This is for two IRF510s in push pull. Each draws about 2A. Input is 4Ax 13.5v = 54watts. The 100v peak to peak is at the secondary of the PA transformer. The drain swing is about 35v peak to

Added is the bias circuit that I use and created by W1GHZ and N1JEZ for use with high power amps? using RF rated LDmos parts.? Its posted to show an example, not the only way. I could only post an

I got it, it is just a matter of adding another record edit form. I will get to it. - f

ps.: I want to make corrections in the saved file, because I cannot get involved in the process of automatic logging. -- Gyula HA3HZ

I correct the errors in the database, because the font size of the 7" screen is small. Therefore, when I want to correct it, I copy the sbitx.db file to a USB stick. Then I installed the DB Browser

Several things... One IRF510 spec is 100V breakdown.? More than that and poof. Also sustained current should be 4A or less (the 5.6A is for saturated switch mode). So the question is why it it 100V

Hello All, ? ? I hardly see any power out on transmit on SSB on any band. I can hear the relay click when I press the PTT button and speak into the mic and I see TX on the display but no forward

Joel, The all the IRF series exhibit this behavior. Just monitor the RF Output over 1 minute of key down. wrote:

Can you explain what the bug is between the keyboard and the logger?

Thank you Gyula and Evan, The cookbook works, and in minutes I was up running v3. i even logged one ft8 connection. Now I look forward to learning v3 features. whising you both a good WE 73

Thanks for the fix. now it's fine and doesn't want to switch on. Question: is the log keyboard still not working? I would like to fix it, because it sometimes saves data incorrectly. -- Gyula HA3HZ

Farhan, I know you have always preferred the IRF510s, but have you considered the IRF530s? I have noticed that most of the cheap Chinese Linear amps use them to get a good 45-50 watts. I just bought

Quick question about the transistor choice. Could you also use IRF520 transistors as well as the 510s? I am wondering as I have some 520s left over from another project. WK4DS

I have observed that any linear amplifier when operated on keydown for more than a few seconds starts to reduce the output power gradually. My sbitx v3 amplifier is using IRF510s. The output power

Gyula, This is fixed in the eeddbae (last commit). Run update to get the fixed version - f

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