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Asharr VU2ESE wrote… Thanks for the explanation. It sounds like a good solution. Perhaps when you get a moment you could let us know the approximate RX & TX current for the uBITX. -- 73 Keith

Jerry, ?The IRF510 is really a general purpose device.? I think initially it was chosen in a lot of projects when it came out due to it's low on-resistance.? However it's not really a "rf

The datasheet shows a max of 100V.?? But I haven't looked at the schematic to see if there are other components involved.?? So that's just for the device itself.? Of course keep it well below

Hello all! I installed raduino version 1.27.2 and I would like to use a dds oscillator for the carrier oscillator (BFO) and I would like to know if this can be done and what raduino pine is taking the

I am using the AGC from the original uBitx design, but found out the time constant of 1uF and 100k to be far too low which makes it a very fast AGC, not giving a nice sound to voices. I changed to 1,5

Thanks Jack.

Jerry, I am in the process to do the following on my "original" BITX40 (yes I got one from Farhan): use an opamp with a gain of 10 (20 dB) and an audio AGC system using a SSM2166. Fortunately I

You have one more possibility I.e when both paddles are pressed! Do the iambic did-dah-did-dah Raj Sent from my iPhone

Dang it, now I'm going to have to learn CW just so I can take advantage of this :p -- Ryan Flowers - W7RLF MiscDotGeek.com ( http://miscdotgeek.com ) Multi Band BITX40 (

i havent yet documented the keyer, keith asked about it, so here it is. USING THE CW KEYER here is a short answer : connect the paddle with a 2.2K resistor from the dot padddle to the CW key, a 10K

Is it with reduino?

He's indicated in other threads that the four filter version is final. It's also clear in the pictures of the production uBITX and the schematic. There's nothing to worry over :) -- Ryan Flowers -

Hi Ashhar, I just noticed this issue now but ordered a ubitx on Friday.? I just wanted to confirm that the four filter option will be implemented on the radios that get shipped out.? Or will there

Hi Jerry, The diode will short out if reverse polarity is done. Normally PSU have fuses and that will blow.? But yes an in line fuse would be advisable. I prefer to use a a relay with a diode that

hi, what's the maximum practical voltage,Vdd that can apply to IRF510.. I tested up to 37V for continuous one minute .... Sent from my iPhone

Put a alarm in the case with a diode so if the polarity is wrong it will annoy the crap out of you and everyone else near you

With the rh15hvf or whatever they are does anything need to be changed like transformers and csn the PS power on it run 20V like the BitX40

What about Tvs diodes? Wouldn’t it be easier? Adding a fuse ot the wire of course

OK, that's good to know. Sounds like the uBitx can do better than 2W on 30mhz if you crank up the gain, but best remember to crank it back down or you will distort when back on 7mhz. And if that's too

hfsigs.com is pointing to hfsignals.com anyway - f jgaffke@...> wrote: