开云体育

The Q15 collector voltage is a bit low to handle loud signals. I changed R114 to 180K and added another 180K from Base to Emitter. This increases the collector voltage from around 1 Volt to about

Maybe you jumped the gun. I thought we were awaiting advice from Hans and Fahan that it was all set to go? Bill, VK7MX

I have no idea what this "E-bay meter" thingie is. Regardless, even if it was supposed to accurately measure an inductance that's down in the nano-Henry's, I'd have a lot more faith in the torroid

I signed up and got the initial confirmation EMail and replied to the EMAIL as requested. I can log onto the groups.io site but get this message for for Bitx and QPRLabs and groups: Your account

Yes vers 3b /3c power supply pcb he small one with the irf520

You are probably right. This is common with the first version of many things. Now the question is: What would you do to improve things? It's likely that the noise is the major source of your

Which BITX pcb are you referring to? I think you were working with the v3.B from Sunil. What is the reference designator? john AD5YE ---In BITX20@..., <ka2rrz@...> wrote : Near the

Well I'm sad to say that my third BITX40 is very unimpressive compared to the first two that I got. First off I've needed to work on the audio stage as it was horribly unstable, even worse than

Farhan, Yes I agree. But my Rarduino is putting out a much higher frequency. I have confirmed this with a scope and a radio. What would cause the frequency to be off that much? Can the sketch be

Is there a way to use my oscilloscope to measure the IF and then hardcore that into the atmega mcu? BITX20@...> wrote:

I took a 100n cap in series with a 10k preset pot..and connected from the top (Red) connection of the volume control to ground..twiddled it to drop some of the treble off. The simplest tone

Thanks everybody for the helpful information! I'm sure this will be quite useful as I build out my BitX40 into a lightweight portable unit. In regards to Sandeeps suggestion of using a 2SC1969 or

the vfo should run from 4.5 Mhz to 5.005 Mhz. At 5.005 MHz VFO, the RF frequency will be 12-5.005 = 6.995. At 4.5 MHz VFO, the RF frequency will be 12-4.5 = 7.5 MHz. 12 Mhz is the nominal IF

"The damn hiss was still present, and my simple but very effective solution was to roll off the audio response a bit with 100n and 10k preset across the volume control – very mellow sound now."

Near the bottom of the pcb is a .55uh inductor, I don't have one and went on Toroid King site and claims T50-2 9 turns. My E-bay meter shows it as a resistor. Should I just go with the t50-2 9

Group, For some reason my Rarduino is way off frequency. ..6.1mhz at a display of 7.100 into a scope by itself...what an I doing wrong? Thanks Mike WA3O

The second annual ARRL sponsored Nevada Amateur Radio Convention will be held March 31st through April 2nd. We are looking for Bitx speakers to join an already impressive list. Please contact me if

Thanks, Hans. I think all of us appreciate your efforts to enhance the utility of this site...it's a treasure-trove for all of us. Jack, W8TEE To: BITX20@... Sent: Wednesday, January

Thank you for the link!

Video shows a successful Bitx40 to Bitx40 contact with VK3SL over 500km away. Both of us were operating from beaches using simple antennas. As you'll hear the signal is both stable and punchy.