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Multiple people have explained how to decrease the emitter resistor in the mic amplifier stage to incrase the gain. I didn't think of that, so just built a 1-transistor preamp for it and was quite

Whenever you wish to FUND that effort, you'll easily find people who will be willing to get on your payroll!! If you look at that photo, there's a "clue" in that one terminal connects to the CASE.

sorry to have bothered you, Max Regards MVS Sarma

Interesting. That picture has no indication as to which is positive and which is negative. If I didn’t already know that the upper right connection was ground the picture would be useless. I am

Thank you. Regards. Max K 4 O D S. I've Never Lost the Wonder. Antique Electronics Site: <http://www.angelfire.com/electronic/funwithtubes/>

I have bookmarked that page. Maybe it will help. Regards. Max K 4 O D S. I've Never Lost the Wonder. Antique Electronics Site: <http://www.angelfire.com/electronic/funwithtubes/>

?yup, that's the way it is in a free nation. this person says X and that person says Y the trick is to be willing to either read, test, or learn how to tell which is closer to the truth. And in

I think something needs to be done. As someone who is new to ubitx I have found information all over the www and when the information on one site conflicts with another there is no way to tell which

Thank you. I’ll take a look. Regards. Max K 4 O D S. I've Never Lost the Wonder. Antique Electronics Site: <http://www.angelfire.com/electronic/funwithtubes/>

?fascinating old microhpone!!! ________________________________ Sent: Sunday, April 22, 2018 10:04 PM To: [email protected] Subject: Re: [BITX20] show your mic I am in the process of re-purposing a

We had mics like that in the control tower at SLC when I started training as an airport traffic controller with the Civil Aeronautics Administration in 1950. Frank King AA7XA Sent: Sunday,

Tim I think for anything other then very infrequent use at that cycle I would look for something with more mass. ?You might get by but I couldn't guess for how long.

I am re-purposing an old microphone from 1944.? It is not from a telephone.? Any guesses?? The original carbon element was bad so I put in a electret mic and MAX9812 module board from eBay that

We were in the middle of thunderstorms, rain and dogs scratching the door. Undaunted, the bitx40 made it through the static crashes to reach WS4JM a few hundred miles to the North. It took a few

Come on guys...my BITX40 is no Maserati but it had an excellent night. 40M peaked about an hour before sunset (my greyline). That random QRM about every 10-15 min might be some kind of radar I'm told.

Doug, Thanks for the info. I usually use jt65. It sounds like this heat sink would work fine for that, correct? About 45sec transmit cycles interspersed with 1 minute receive cycles. tim

Paul has it right. The pin numbers on the schematic don't seem to have any resemblance to the actual pin numbers on the data sheets. I had to actually use an ohmmeter from attached components to

Not bad here this evening in Iowa. Worked KG5WLO, Ralph, VE3THR, Tom, and WS4JM, Jay. Also heard earlier WA3O, KE0NXP, WA4THR, and AC9RZ. Used my uBITX with my half-wave (mostly) vertical wire. John

I'd consider why the Zero sells for $5. I think the biggest issue is that the Pi is a different animal than the Arduino family. First, it does not have a home in the Arduino IDE, where most of the

at times I have wondered at what point has a person reached too many adapter boards, and should really consider a fresh start.? As you already stated about interfacing the Si5351A chip and the