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Steve, you need to install?the TX-RX mod so that the radio will go into TX when you press the button. Alternatively, you can press PTT manually on the mic and then press the tune button. 73 Allard

Thanks Mike, but according to this ( https://github.com/amunters/bitx40/blob/master/operating-instructions.md ) ,? ------------------------------------------------- CONNECTING A STRAIGHT MORSE KEY

Tune button? There is no tune button with Allard’s mods! Maybe you are thinking of the CW spot / fine tune button? This puts a tone on cw for allowing you to align the incoming signal with the

Hello All, I got Allard's Raduino sketch to compile on an Uno R3 that I'm playing with, and I also got a rotary encoder working on a test sketch, and now I need to figure out how to make Allard's

Hi gang.? I've got my '40 assembled, tested, and mounted in a box.? Loaded Allard's latest as well as all his hardware mods, with the exception of the TX-RX mod.? 6W output on SSB, but no output on

Hello Marco, Yes? I saw this cap on some schematics and they are supposed to flatten the gain curve. Thanks for the suggestion. I will have a look at this when I am finished with the audio

John, Have you tried putting a 150 to 330pf cap across pins 1 & 6 on T11? It might help balance the output. Most push-pull amps have this cap. Just a suggestion. Marco - KG5PRT

Thank you to those who responded to my question. Bill Richardson’s informing me of the contrast control on the back of the VFO module did the trick. It was originally set to maximum. Now that the

Rlacement of MOSfets alone can't not solve the case. ?However there is reasonable improvement,. Interestingly, there is a dip in gain at 21.2MHz and recovered at 28 MHz. Twe need to analyse this

So this goes on for more than 28 hours then? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton,

BITX QSO Afternoon/Evening, Sunday, February 18, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere. Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40

The same would be true for the RD16Hxxx devices, incidentally. john AD5YE

Indeed, there is the PA+ supply voltage on the IRF510 drains during receive. But zero drain current because the IRF510 gate voltage is zero and nowhere else for the PA+ supply to go.? Not so much as

Jerry But that does not remove DC from the finals.? I did not notice that the bias was dumped during receive.? That is my error.?? Arv_-_ Sent from my Verizon, Samsung Galaxy smartphone

I believe it has already been done for you. The LM78L05 regulator that supplies 5v to the IRF510 gate bias pots is in turn powered form the TX 12v rail. That TX rail is shut down during receive by the

I think Jerry has a much simpler idea -- just find a way to disconnect the gate bias during receive. This would put the gates at 0v, and effectively shut off the IRF510 drains. Probably a good

Like this: Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand

In the case of the uBitx and Bitx40 we use the IRF510 FET's to turn off the PA power by shutting down the gate bias voltage source during receive. Drain current should be zero.

Post it here or on FB if you accept Paypal.? I bought a uBitx off a fellow ham that was in the same boat.? 73, Michael KM4OLT

Hello For power conservation it is possible to use a power FET to turn OFF voltage to the RF PA section during receive mode. Turn the switch device on with +TX power and off when this goes to