开云体育

Use a 5 volt 3 pin regulator, powered from the 12 volt rail?

Art, I built a small board with a 7805 on it. Haven't tested it yet. 73, George

Thanks Darryl...that gives me something to check into...it's appreciated! Jack, W8TEE To: [email protected] Sent: Monday, January 23, 2017 3:36 PM Subject: Re: [BITX20] Different display issues

the Bitx40 uses 12v natively however the qrp-labs DDs vfo requires 5 volts. I have tried several buck converters but there is a lot of hashing (noisy) when the converter is powered on. Anyone have a

Ok, I see where to cap goes, totally missed that at first. ?Just wondering on the 50 turn torroid now.

So I remove L4, and what do I do with the 50 turn toroid? ?Also, anyone know what the .01 uf cap is for that it came with? Thanks, Janson W7TJS

Greetings all. I started tracing my PA with Leonard's documentation. http://golddredgervideo.com/kc0wox/bitx20version3b-c/3b-cpawaveforms.htm The first discrepancy I noticed right away. He had 30v

Hi Jack, I have been battling "noise clicks" for some time now in my DDS. I have tracked it to the i2c bus SDA data being injected in the power rail by my OLED display, the bitx is so sensitive it

Yes, when power to Q1 is switched off, that path is linear. But I am curious how big a signal it can pass as a linear amp when that pot is at 10k. I'd guess either your mod or the pot on the rx line

All: I have my B40 with Raduino display and it works as advertised. I am now trying to add my TFT display and DDS VFO, which is a AD9850, more-or-less the same as the VFO in the Forty-9er article

Good question Jerry. No, it just gets deaf(er). No extraneous products. With Q1 idle signals pass from C11 through R14 to C13. It would take nearly a volt to broach the barriers on the idle BJT. At

No shorts in the turns. I also re soldered the connections. When I scope the transformer, I get 250mv p-p. Looks like one of the transistors is gone. I had it working for quite for weeks. Checked my

I'm sure it works well enough. ?My concern is that the diode ring mixer is non-linear, but normally only the 40m signals from the antenna get passed on to the 12mhz crystal filter because the

Look back at messages. There was an email address that you send PayPay to and the serial numbers of the boards. I just told them I needed 2 and sent the money PayPal. I put how many raduinos i

Send an email to hfsignals at gmail dot com stating you're an old customer and would like the Raduino upgrade.. Do it now, they were offering the upgrade to old customers for $14, but seems they were

Using a pot between antenna and ground, center wiper into the receiver, seems the most obvious thing. ?The ideal place for such an RF gain control would be in the wire between K2-14 and K1-12, an

Hello, I received a new BitX40 in December. I see that the 2017 units come with a Raduino DDS I would like to order one or two Raduino's. How do I do that? I do not see them for sale on the

I bread boarded Peter's set up and it works great. The only variation I had was I put the LED and LDR in a sleeve of shrink tubing. (I bought a bag of the stuff at Dayton for next-to-nothing and I'm

The simplest way. A pot at the aerial input to the receiver side. 50Ω, 100Ω, 1kΩ, 10kΩ whatever you have. Aerial input to the top, centre to receiver, other contact to earth. Used it way way back

Thank you 72, Bob KI0G