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The schematic is attached to this comment: /g/SoftwareControlledHamRadio/message/33107

*** I guess that's why the radio has a built-in SWR bridge, and fairly fussy protection software. Since I'm operating it into my Tiny Linear, the radio is isolated from antenna SWR. Nobody hears me at

*** It's a digital PA. In the schematic, the BS170's are fed RF by LOGIC gates. I think it's what's called a "class E". They don't even have heat sinks. They output 5W without breaking a sweat. The

It is. They become extremely sensitive to load mismatches. The group is full of reports of them failing, especially when an external tuner is looking for a match. Dave

BillIs there a. Link to sch etc for this little board.?I don't have any issues with my build and a 6inch cable but then again, not checked the? higher bands.Glenn?'72 ISUZU BELLETT SPORTSent from

Did you get a chance to look at the spectrum? That seems like a lot of power for BS170s! -- 73 Greg KF5N

Testing my 20W PA with -10dB in verses? 0dB in I see very little change in gain on lower bands 160-7, some gain on 10-17 and significant (3dB) gain on 28-50 Mhz. Max 0dB in is 160-80m is 12W,?

to avoid misunderstandings: 3.3V are only on pin46 with teensy in! Teensy produce this 3.3V by himself! we have ?different rails with 3.3V!

if there is no 3.3V on Pin46, please check for short (without teensy) pin46 to ground! if there is a short you will destroy the (next) teensy if you (re)placed him!

I was just browsing their website, and I noted that Hans has finally released beta SSB software for the QMX. Downloaded it, ran it...holy crap, it works! SSB is created by doing magic with the IQ

I sent out five of those new display driver boards about a week ago and only saw posted that Terrance got his working as was able to use a 3-foot long display cable without display-T41 errors/lockups.

If no voltage on pin46 then the teensy socket or teensy itself is bad. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton,

D2 and D3 are illuminated? If so the power rails are working. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

Thanks for the advice. Here's what I have done so far. 1. Replaced the LM117 2. J5- 3v and 5V on their pins 3. 5v on TP1 4. 3.3v on TP2 5. 12v on Fan port 6. Replace the pin connector for the teensy

1) I would take out the teensy (socketed ? and possible?) and would check the TP?s like Oliver 2) if it?s ok 4 possibilities a) Teensy is defekt b) check Teensy Pin 46 (without Teensy) is there a

Here's the gain of my K9HZ 20W PA: If we calculate the gap between the feedback amplitude and the amplifier gain, we can quantify how much margin we have before the radio begins to oscillate. It's a

I had a Teensy blow when on power up because a the LM1117 failed. I replace the LM1117 with MP2307 buck converter module. The LM1117 had the fan and heatsink on it but its current rating is

Good detective work. That should do it. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator

I have now confirmed that, after I replaced U8, the latest version of the code (Ver66-9) on GitHub ( https://github.com/KI3P/SDTVer066-9 ) does not suffer from oscillations on any band with my V12

Also don't forget you have to slice the trace on the Teensy to disconnect the USB power. -- 73 Greg KF5N