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Re predriver (Q911, Q912): ”The 5109 was best even though I used only 1” So, the question is: If I use a 2N5109 for the predriver?“Should I also change some resistors to adjust the bias? Or

I don't know anything about those. They do say for using with LED strips only. Most likely they are not regulated and will put out over 12 volts with a light load. Another thing is they are probably

Hi,? The receive on my ubitx has gone very intermittent! One minute everything is coming in strong then all of a sudden it drops out and stronger stations are in the noise then back again. More often

Hello Hiro, I understand about the excitement. I had a dreadful time resisting the urge to power mine up on a sheet of cardboard (for insulation) before I formed the case to fit. I did connect power

Hi Mark, I laid out and folded a case of steel for my ubitx. Looking from the front, my antenna connector is at the far right rear corner and the internal connector wire is less than two inches long

Have any pricing done on them yet?

My 2A supply will not work the ?BITX on 80M.? The supply trips out on overcurrent.? It works well on 40M and above.

0.1 mfd across the power leads at the power supply and again at the uBITX power connector. It could be that RF is modulating the 12V power lead and that causing RF in the power supply regulator.

Seems like the problem is coming from the 5 volt lead. I am hesitant to try more than 10uF from it to ground due to the charging surge. It already has 2uF when the AGC is connected. What about some

You misunderstand me, Ralph. I don't WANT it to act the same. If I wanted that, I'd just run it directly from the jump box. But I don't want it to run away in RF, as at that level it can damage my

Ah, ubitx.net says “5 Amps should suffice”. // hiro, JJ1FXF 2018/06/30 2:33、hirosmb JAZZ <hirosmb@...>のメール:

Those two daughter boards especially with those long wires are a sure way of inviting RF pickup especially being so near the LPFs relays. It could be that the boards are picking RF directly by being

IC. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F122586871489 Is the one like above OK? Thanks in advance, Ralph. // hiro, JJ1FXF 2018/06/30 2:19、Ralph Mowery

Make sure the ground is a healthy healthy healthy connection as well, either a chassis or some pretty thick wires and lots of them, arrange so they all connect at some point called single point

That's apart from Gordon's suggestion

Try RG58 for the supply.

You may just get by with a 2 amp supply, but I would go with at least one rated for 3 or 4 amps. It is always to have a few more amps than needed so the supply runs cool.

Sprinkle 0.1 ufd capacitors from supply lines to ground. They’re cheap, and they’re great!

The issue discussed in the 'RFI from uBitx TX after AGC and other mods installed' thread appears to be caused by RF getting into the 12v supply and from there into the 5v supply that feeds the AGC

The photo is of a 5" touch screen (resistive) display (7" is an option) and the processor is the Teensy 3.6. Al (AC8GY) and I are working to finish the JackAl board for everything. I posted a