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I got IFR510 from someplace. I can't track the order history. But using a simple set of DVM-based tests they check out for on/off state. I know that says nothing about the actual performance on the

All: The BITX40 is sold. Thanks for your interest. Jack, W8TEE

The fact that you could do the bias adjustment implies that K1 is working.? It also implies that both of the IRF510s are OK.? Either could be false, but not likely. That leaves the drivers from Q90

Let me try to help you OM with my limited knowledge which I have gained after building my homebrew ubitx based on V5. Disclaimer: I don't own any version of ready made build ubitx :) My first question

Check the connection between the traces and the 510s. Check continuity between the 510 pins and the trace not just at the hole. 73 Aa4pg

Hello all!? I failed to pay attention and left my beloved V4 uBIX on TX into a high SWR situation with too many watts for too long while and things got sort of too hot. Like Africa hot. After I got

Like all of the stuff Hans sells, the manual is exceptional. Lots of notes in there about design tradeoffs made. And a bunch about what it would take to make it linear. Should have a way to evaluate

Ah ok…. Well if it’s “Class C” it’s not gonna work for SSB. The only way to change that is to bring it to at least “Class AB2”… by reducing the bias and allowing the device more

I have a BITX40 for sale in its original shipping box for $50, with free shipping to CONUS.Write to me privately if you are interested using my email address on QRZ.com. PayPal only please! Jack,

Nice to know. I don't think it can be used for SSB as it is a class C amp unless some mods are done. Looking forward to seeing Allison's reply Il 12/dic/2019 17:49, "Arvo W0VRA via Groups.Io"

Single band Sent: Thursday, December 12, 2019 10:50 AM To: [email protected] Subject: [BITX20] ?BITX & QRP labs 50W PA Anybody considering using a QRP Labs 50W PA with their ?BITX?

Ok, I sort of take that back. The webpage also says: ###################################### ------------------------------------------------------ 2. Can it be used as a Linear for SSB and other

That's a class C amp. As it says on the web page you pointed to: Jerry

Anybody considering using a QRP Labs 50W PA with their ?BITX? http://qrp-labs.com/50wpa There's no band switching yet.

And solved issue for me, thanks for posting -- PE3ES - F4VTQ - Erwin 73

Erwin I was meaning the power adapter for the active antenna not the uBITX. Skip Davis, NC9O

Anthony, Thanks for letting us know about the spot weld cutter drill bit. Looks ideal, perhaps the easiest way to prototype a circuit. The almost solid ground plane on the top side is good enough in

Hi Erwin, Did You perhaps use a linear potentiometer instead of a logarithmic ? That can cause the effect of the volume id very sensitive at one end of the scale. Best Regards, Jonas - SM4VEY Den tors

QRPme style pads created using the bits as shown in the picture (attached incorrect picture in my previous post). I would recommend using the 3/8 inch bit to cut the pads and using the 5/16 inch to

The potentiometers provided with the case kits and maybe even for the board kits are both linear. ? For audio volume control purposes, an audio taper will provide the logarithmic progression