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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

Hans, I just went back and checked. The clicks were there as far back as 004 (Rev1 PCB). However they didn't become nearly as obvious until ver 012 when the volume control was fixed. But the max gain

QDX Lo Band Kit with pre wound and pre tinned toroids for sale. Version 3A. With Enclosure. Shipped Conus $90 PayPal. Also...these are discontinued at QRP Labs...2 each 5 Watt amp kits and 2 each

It goes back at least as far as 10, which was the firmware on my first delivered QMX. It’s noticeable in headphones and amplified external speakers and in RF and practice mode, into a 50ohm load and

Good morning is there anyone using an n7dcc atu10 (Chinese copy) that has a jack on the back labeled ext. is that external power to charge the internal batteries? if so what type of plug does it

Evan, Really appreciate your help and info. Will try again to make sure toroids are good and check the diode voltages. One problem I have is identifying? right solder point on bottom side of