Staples would be a good bet for me. However, I have the drawback that it is 60 miles from me, and I cannot afford the trip most of the time, much less added cost. I had a bad weekend with my Truck, wh

Heads up on a word used. tinier means more tiny tinnier means more tinny Makes it easier for others to know what you meant. I know that English, of bout UK and USA are not always understood, and words

I goofed slightly when I connected a ten turn pot for my Raduino. Got two wires reversed, so I have to swap em Not really a problem, because I merely tacked the wire ends to the lugs on the pot. It do

#bitx40help #bitx40

I recall, nore or less, the AVC that AM Broadcast radios used to use. But maybe it was more AGC. They use a dual diode/triode. The triode for first audio amp, one diode for detector, and the other for

Most, if not all, of the AGC circuits take their input from the high side of the volume control. Some control only audio, some control RF input from antenna. And the circuits I like control the gain o

To save money, because I am very limited, I'd use a link from a chain, or maybe a rusty quick link. Don't care how it looks, just how it works. I have all sorts of odds and ends handy. I did splurge a

#bitx40

I recall that there are a number of resistors that needed to be changed in the early verions, to keep things a bit cooler. I think it was the emitter to ground ones, like R12, R22, and so on. Depends

Regarding the micro USB connectors, there are 2 different kinds. The one looks to be the most common type as used on my android and rechargeable flashlight. The other, as is found on the Raduino I hav

There was one posted on one of the groups. But may have been on facebook. I don't recall now. I will try to remember and look for it later.

The mention of not plugging or unplugging the headphone/speaker with the radio on reminded me of an incident years ago. I did radio repairs in my brothrs TV hop yers ago. Had a customer brought in a B

The cases I want are to be able to do custom rigs. I figure out what I need to fit the boards I'll be using. What is right for some is not always right for another. What I have chosen gives me space f

It clipped off the first part of what I thought I sent: https://www.banggood.com/250x190x110mm-Blue-Metal-Electronic-Enclosures-DIY-Power-Junction-Box-p-1067251.html?rmmds=myorder&cur_warehouse=CN I c

Also, one person, I forget the name, wanted to know how I mounted the raduino to the display with the standoffs. Let state, first, I bought a BITX40, the slightly older version from HFsignals, that wa

Just thought, I should have added this picture of a finished board, showing the parts nicely. Dang big picture.

#ubitx

Also, I forgot, here is the board layout for the board that comes with the kit. I inly have the parts, but will put them on a perfboard.

#ubitx

Here is the scematic. -

#ubitx

here is a partial schematic for the BITX40 from amateurradiokits.in. You can see where the AGC ic connected to the first RX IF amp. I'll look for the schematic for the AGC kit for the same, at least t

#ubitx

Are these what you mean by stand offs? 4 are used to mount the main board, and the other 4 to mount the display to the raduion. Plain and simple.

Quote "Limit the power supply to 12 volts, anything more than 12v and Q13 and R141 will run too hot and can burn out." unquote. looking at the schematic, it looks like you may mean Q14 and not Q13. Q1

#bitx40

Looks very good. Hope you catch that Sunday net. I'd want to try catching the Noontime Net, out of New Mexico, which I caught before. I hope to get mine done enough for a few pictures this month, or a

#bitx40