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Thanks for you input , I'm under restrictions no antennas allowed on the property buddy, at all, trying do make do what I can, you have no idea what I know, thank you for the assumption, not has the

300/ 7.033 Mhz? ?x 0.95? x? .25 = 10.13 m each side of dipole. = 33.23 ft ; you say 40 ft? x 2? There is no chance that the forty foot antenna (as a dipole)? is resonant or presenting anything

Allison, at the beginning of my professional career 38 years ago I learned that to sketch level diagrammes will help a lot to understand the requirements of individual stages concerning gain,

ubitx V4. 3 random wire 2 leads in tree 40 feet long on second floor 60 feet up from ground cw very weak can heard one station not the other. What could I have done wrong, rechecked wiring. Only error

OM You will need to give more details to get assistance.? For example: 1??? Which board v3, v4? 2??? What antenna are you using?? You will need a decent antenna to hear anything on any HF

No not from eBay aduino replacement board .

uBitx from eBay?

Hi I purchased my unit in July same problem , order both board s off from eBay . my cw is week. Yesterday thought I heard cb or cordless phone , tried everything except flashing again. I'm no going to

Thank you for your many personal insults. Tom, wb6b

For Pete and repete: Known problems and this was as of mid June.? IF your not aware of this log in to the form web version and read. History is amazing and repeated, repeated, repeated, repeated,

We still have some clean up to do on the code for our JackAl board on the ?BITX, but here's a sneak peek. (Please keep this under your hat until we release it...it's not ready for prime time yet.)

Jack See messages from July 6. Principle mod seems to he replacing audio IC amplifier with a discrete version. Just learning myself as our club is about to order boards. Curt

On Sat, Sep 15, 2018 at 04:56 PM, Tom, wb6b wrote: That is a handy summation of the gains needed. If switching the pre-driver to a mosfet (or better bipolar transistors, if they provide the same gain

Tom, You keep missing that with 4 stages they have to provide the gain at 30mhz.? Its built with 3904s and they just can't do that. What the 40M bitx does is not relevant.? Why because it does it at

I measured the OIP3 of the uBITX Bi-amp stage I proto built and the Hayward version, both at *45MHz* using the 1dB gain drop method. uBITX:? +20.83dB OIP3 Hayward: +20dB OIP3 Haywards Paper measures

Iz oos, I was thinking whether a MMIC up to 10dbm and an RD06HHF as driver like in the 10w qrp-pa-2008 might make sense Whats that going to fix?? The transformers need to be reworked, the prior

I forgot to add that the original analogy was based on the BITX40 only using 3 stages to produce approximately the same power of the uBITX with 4 stages. With 4 stages there should be more gain to

Hi Allison, That is a handy summation of the gains needed. If switching the pre-driver to a mosfet (or better bipolar transistors, if they provide the same gain advantage) could provide enough

Warren, I understand it will fix getting a cleaner source and levels out of the IF. You still can drive the mixers harder than compression at which things get nasty with spurs and all. Hows that going

all future will be told *see wiki*.