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Yes, 100% agreed with Allison. MOSFETs don't have an intrinsic frequency limit like a bipolar. Which is also why good board layout and attention to parasitics is important because you can easily get

I have a linear amp that gets over 40W at 6M using IRF510s. Wasn't hard to do that. The characteristics are not great but its not about capacitance as a sole factor.? Then again input Z is a factor

Yep. Mine looked the same. Took Han's advice and touched them up. Super pointy iron tip, turned down the heat a bit and easyyyyy on the solder. I have a bit of 0.015 inch solder. Goes fast. I do use a

Almost completed building my low band QMX and the usb connector soldering looks poor. Hans, is this what you have mentioned? Do you advise I touch it up? Also, I found the BNC connector needs to be

Mine clicks as well. I turn the volume down when sending and the clicks disappear and then turn it back up as soon as I’m done sending to avoid hearing them. 73, Matt AE?XR

Hi Greg, AFAIK, IRF510 was designed to be a power switching device. Many years ago, some kind soul found that it can also be used as a low cost HF power amp, with more than decent results. But, as

I tried factory reset and f/w017 reload with no change in clicks ?- ?still there. Power cycle or no, any and all changes in settings and it's still the same. If I turn the volume down to zero or

It’s possible the 40M amp is oscillating. Also possible that the input Pi attenuaor has an issue. I have 2 of those 40M amps and one gets 25W with 4 W in at 13V 2nd gets 50W with 4W in at

When you see an amplifier provide loads of gain in a particular band or frequency it is usually because there is a circuit self resonance, so losses are minimal, or there is some negative feedback

Items sold - thanks for any inquiries. -- Jim / K7TXA Eagle, ID SKCC 10447T BUG 301

I believe that the EXT jack is for tuning control/triggering by (if I recall correctly) Icom transceivers. I think it is a 3.5mm TRS jack. The USB port on front is used (on my unit) to charge the

Yes. K2 - 50W Amp - QrpGuys SWR/Power meter. Greg Yahoo Mail: Search, Organize, Conquer On Thu, Mar 14, 2024 at 12:29 AM, Larry Acklin<acklin@...> wrote: Hi- is this into a watt/swr

Good morning :) Thanks a lot for your time and hints!! Yesterday afternoon/evening I did some more tests. (dummyload instead antenna; battery driven equipment; psu driven equipment; other

It's the other way round, Charles. A lower impedance load will place a higher burden on the output amp.

Greetings all, I do not have a QMX, but upon reading that the problem went away when the audio output was connected to a line-level input AND that it seems to be volume-related, the sound engineer in

Hi- is this into a watt/swr meter then dummy load? Antenna connections with SWR issues can fool inexpensive watt meters. Larry KB3CUF [email protected]> wrote:

Hi gang,? Not complaining ...? ?Just curious. I had recently built 3 of the 50W amps ( 15M, 20M and 40M). Want to use them for a little extra punch (say 10 to no more than 20 watts out) for field

Larry, I did the factory reset and reloaded latest firmware.? No change. Re did solder on both torids for 10 and 12 meters, no change. Next step is try and check the diodes as Evan

Emory: before you go to all the hassle of checking the LPF's I would definitely try a simple factory reset as Evan suggested above. Have you tried that? The reason I ask is that yesterday I

It's a strange bug(?) for sure.? I repeated my headphone versus pc soundcard input test again this evening and the sidetone audio was perfect using both!?? I definitely had the problem before but