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"My vote would be to have a current sense for the final in the next rev of the main board." Well...I don' know, Jerry. Consider the size of the TP-42, or any current shunt capable of over 2A. The

My vote would be to have a current sense for the final in the next rev of the main board. ?That way there is no additional high current switch required, all we need is some control circuitry to shut

This would work. The idea of a current limit is a good one. However, in the BITX40 it would have to be on a separate board with additional wiring. That opens up the problems of ground loops and

Good evening, friends.I found at www: Ozqrp.com. A DDS Si5351A-B-GT clock generator, with an interesting OPTIONAL ATTENUATOR LOW PASS FILTER BOARD. This could be the solution to the carrier problem at

John, you are absolutely right in How/when it happens. as for RV1 mine was cranked almost all the way up (turned almost all the way counter-clockwise) I am going to try and pull the mosfet tonight and

True, Jerry. He turns on power, the rig clicks and turns off, and after REMOVING the PA power, RX is ok when power is applied. This is almost certainly the output transistor going into avalanche.

Hello all, Has anyone thought about implementing something like this to protect the IRF510? I am still waiting on a reply from the post office, to see where mine is. It looks promising, especially

I just lifted one of the L4 connections to the board and left it in place all be it not connected to the circuit at on end of the inductor. DDS works fine with no known issues. -- Mike VK3XL

Near as I can tell, he never hits the PTT switch to transmit. ?And the IRF510 is still heating up. I did tell him that the gate to the IRF510 should be zero volts during receive. ? If it isn't then

Guys thanks for all the input. I'm going to be doing some more troubleshooting tonight and we shall see what we come up with. I've ordered some irf510's just I case but I am highly suspecting that is

Mine at first was off by 1 in the digit furthest to the right. Used it like that for a week then tried the recal process and it worked fine. Havnt had to adjust it since. This is on stock sketch.

Regarding the IRF510: There is no power on the gate on RX, but there is power on the drain, whether the connected PA is to the to the Vcc source or another power source (though it is possible to have

The blink program used to be (and still is) a separate program. However the latest bootloader program has a blink function included. If your Uno or Nano has a blink, but nothing else, it's likely

I knew it was writing to eeprom but there is no matching call in the code to read it back. Either to apply it or pass it.? Neither does the library call it.? It can't possibly, how would it know

My issue is that the waveform is not a nice sine - so i hear all sorts of signals on different frequencies (I dont have a freq counter, so I rely on my big rig to determine the freq.) I have decided

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Nice discussion of diode DBM but to return to the original posting of the time domain waveforms, if it is a double balanced mixer where the sine wave gets squared off by the diodes going into

When I got my QRP Labs VFO kit I simply removed L4 and plugged in the cable from the VFO. You can remove the trimmer cap next to L4 also but there's no need really. It made no difference for

You seem to know how to use that scope, and have a good idea of how this works. ?You'll probably figure it out. ?If you want hints, here's what I'd be looking for: Ashhar is right, triple check

Imeant to change this line as it is hard to read: ?? ? ?cal = (cal * 10000000l) / frequency; Is it 10MHz, or 100.000001MHz? A good rule: When you use a type qualifier, make it uppercase: ? ? ?