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Chip: It you like, I can walk you through some diagnostics over the phone, provided your scope has sufficient bandwidth to use it to trouble shoot. What is the bandwidth of your scope, and do you have

when I saw that in your book I remember thinking if my boiler quits in the middle of winter that would make a nice backup! ? -- www.bitxmap.com ( http://www.bitxmap.com )

Very true!

Why not just feed each base with a capacitor from the pre-driver and add a 1k resistor to gnd from the base of the pnp? Then the biasing isn't a problem. tim ab0wr

The DL I mentioned the other day has this resistor pack: in it, which has 20 3W 1000Ω resistors sitting in a bath of mineral oil. Overkill by a factor of 20 for QRP, but great if you work both QRP

Chip?? It is possible to use your oscilloscope to trace signal flow, but the scope needs to have adequate bandwidth for the signal being viewed.? A diode detector (1N4148 diodes work fine for all

Most who have performed detailed tests seem to indicate that unwanted spurs are a problem only if AF or RF drive levels are set too high.? On CW the uBITX does not use modulation and thus has low

If anyone is looking for a kit here what I have https://qrpguys.com/12w-dummy-load-power-meter? sure you could piece together the parts for a little less but I didn't have everything on

I am reading this thread. I really have no comments except that there is no objective measurement or audio clip that i can comment upon. Hence let me make some general comments. As old timers will

I took a look at the datasheet.? It might be a good part to try.? I'd be curious to hear if they work for you. Hint if you go with 2n5109s due to their size its easier to put on on the top and the

Where to add the ferrite? On the antenna leads?

I have to agree with Allison. I tried KSP10s (TO-92) and a KST10s (SOT-23). These are exactly the same as the MPSH10s. Things went backwards. They only dissipate 350mw. The FT is higher but it

You don't need an Arduino to measure power. You need a load (10W) such as six 300 ohm 2 watt metal film resistors in parallel and a 1n5711 diode to rectify the RF.? ? Look around the net as that is

I haven't assembled my v4 kit I received a few weeks ago yet, but have been reading and planning for an upcoming build and am really excited.? I was hesitant at first about ordering the kit as I

"...that it will be required by the builder to almost replace every component to make the rig work." Bullcrap, and you know it! "No one can expect a builder to rip out components and bodge the pcb to

Nick, The biggest difference is the BFR106 has a FT of 5GHZ minimum and the MMBTh10 its 650 (typical). That is the starting point.? ?That should stand out for a application that requires a lot of

Mine works fine as advertised. It’s people like you that killed Heathkit and other inexpensive radios . The radio works fine and legal, if used properly. If you don’t like them go buy a

Because the part in the to92 package is not the same especially the pn2222. Its not blind do it its the result of testing.? ?There are two parts that use the? same die, 2n22222(a) and 2n2219(a).?

There are literally thousands of these radios in the hands of users and only a very, very few have had any problems. They work as advertised if built in a reasonable fashion, something Farhan has no

There have been a few threads discussing how the uBitx has spurs that may exceed the spur amplitude allowed by law. Ham radio is regulated by Part 97 of the FCC regulations. The allowed spur amplitude